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mac80211: Let userspace send action frames over mesh interfaces
[linux-2.6-block.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
571ecf67
JB		 19#include <net/mac80211.h>
20#include <net/ieee80211_radiotap.h>
21
22#include "ieee80211_i.h"
24487981 23#include "driver-ops.h"
2c8dccc7 24#include "led.h"
33b64eb2 25#include "mesh.h"
571ecf67
JB		 26#include "wep.h"
27#include "wpa.h"
28#include "tkip.h"
29#include "wme.h"
30
b2e7771e
JB		 31/*
32 * monitor mode reception
33 *
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
36 */
37static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 38 struct sk_buff *skb)
b2e7771e 39{
b2e7771e
JB		 40 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
e3cf8b3f 42 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 43 else {
44 /* driver bug */
45 WARN_ON(1);
46 dev_kfree_skb(skb);
47 skb = NULL;
48 }
49 }
50
51 return skb;
52}
53
f1d58c25 54static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 55 int present_fcs_len)
b2e7771e 56{
f1d58c25 57 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 59
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 return 1;
0869aea0 62 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 63 return 1;
87228f57
HH		 64 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 67 return 1;
68 return 0;
69}
70
601ae7f2
BR		 71static int
72ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
74{
75 int len;
76
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
79
6ebacbb7 80 if (status->flag & RX_FLAG_MACTIME_MPDU)
601ae7f2 81 len += 8;
7fee5372 82 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 83 len += 1;
601ae7f2
BR		 84
85 if (len & 1) /* padding for RX_FLAGS if necessary */
86 len++;
87
6d744bac
JB		 88 if (status->flag & RX_FLAG_HT) /* HT info */
89 len += 3;
90
601ae7f2
BR		 91 return len;
92}
93
d1c3a37c 94/*
601ae7f2
BR		 95 * ieee80211_add_rx_radiotap_header - add radiotap header
96 *
97 * add a radiotap header containing all the fields which the hardware provided.
98 */
99static void
100ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
101 struct sk_buff *skb,
601ae7f2
BR		 102 struct ieee80211_rate *rate,
103 int rtap_len)
104{
f1d58c25 105 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 106 struct ieee80211_radiotap_header *rthdr;
107 unsigned char *pos;
6a86b9c7 108 u16 rx_flags = 0;
601ae7f2
BR		 109
110 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
111 memset(rthdr, 0, rtap_len);
112
113 /* radiotap header, set always present flags */
114 rthdr->it_present =
115 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 116 (1 << IEEE80211_RADIOTAP_CHANNEL) |
117 (1 << IEEE80211_RADIOTAP_ANTENNA) |
118 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
119 rthdr->it_len = cpu_to_le16(rtap_len);
120
121 pos = (unsigned char *)(rthdr+1);
122
123 /* the order of the following fields is important */
124
125 /* IEEE80211_RADIOTAP_TSFT */
6ebacbb7 126 if (status->flag & RX_FLAG_MACTIME_MPDU) {
6a86b9c7 127 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 128 rthdr->it_present |=
129 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
130 pos += 8;
131 }
132
133 /* IEEE80211_RADIOTAP_FLAGS */
134 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
135 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 136 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
137 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 138 if (status->flag & RX_FLAG_SHORTPRE)
139 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 140 pos++;
141
142 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 143 if (status->flag & RX_FLAG_HT) {
144 /*
38f37be2 145 * MCS information is a separate field in radiotap,
73b48099
JB		 146 * added below. The byte here is needed as padding
147 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 148 */
149 *pos = 0;
8d6f658e 150 } else {
ebe6c7ba 151 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 152 *pos = rate->bitrate / 5;
8d6f658e 153 }
601ae7f2
BR		 154 pos++;
155
156 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 157 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 158 pos += 2;
159 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 160 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
161 pos);
5f0b7de5
JB		 162 else if (status->flag & RX_FLAG_HT)
163 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
164 pos);
9deb1ae5 165 else if (rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 166 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
167 pos);
601ae7f2 168 else
6a86b9c7
JB		 169 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
170 pos);
601ae7f2
BR		 171 pos += 2;
172
173 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
174 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
175 *pos = status->signal;
176 rthdr->it_present |=
177 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
178 pos++;
179 }
180
601ae7f2
BR		 181 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
182
183 /* IEEE80211_RADIOTAP_ANTENNA */
184 *pos = status->antenna;
185 pos++;
186
601ae7f2
BR		 187 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
188
189 /* IEEE80211_RADIOTAP_RX_FLAGS */
190 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 191 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 192 pos++;
aae89831 193 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 194 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
195 put_unaligned_le16(rx_flags, pos);
601ae7f2 196 pos += 2;
6d744bac
JB		 197
198 if (status->flag & RX_FLAG_HT) {
199 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
200 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
201 IEEE80211_RADIOTAP_MCS_HAVE_GI |
202 IEEE80211_RADIOTAP_MCS_HAVE_BW;
203 *pos = 0;
204 if (status->flag & RX_FLAG_SHORT_GI)
205 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
206 if (status->flag & RX_FLAG_40MHZ)
207 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
208 pos++;
209 *pos++ = status->rate_idx;
210 }
601ae7f2
BR		 211}
212
b2e7771e
JB		 213/*
214 * This function copies a received frame to all monitor interfaces and
215 * returns a cleaned-up SKB that no longer includes the FCS nor the
216 * radiotap header the driver might have added.
217 */
218static struct sk_buff *
219ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 220 struct ieee80211_rate *rate)
b2e7771e 221{
f1d58c25 222 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 223 struct ieee80211_sub_if_data *sdata;
b2e7771e 224 int needed_headroom = 0;
b2e7771e
JB		 225 struct sk_buff *skb, *skb2;
226 struct net_device *prev_dev = NULL;
227 int present_fcs_len = 0;
b2e7771e
JB		 228
229 /*
230 * First, we may need to make a copy of the skb because
231 * (1) we need to modify it for radiotap (if not present), and
232 * (2) the other RX handlers will modify the skb we got.
233 *
234 * We don't need to, of course, if we aren't going to return
235 * the SKB because it has a bad FCS/PLCP checksum.
236 */
0869aea0
JB		 237
238 /* room for the radiotap header based on driver features */
239 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 240
241 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
242 present_fcs_len = FCS_LEN;
243
e3cf8b3f
ZY		 244 /* make sure hdr->frame_control is on the linear part */
245 if (!pskb_may_pull(origskb, 2)) {
246 dev_kfree_skb(origskb);
247 return NULL;
248 }
249
b2e7771e 250 if (!local->monitors) {
0869aea0 251 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 252 dev_kfree_skb(origskb);
253 return NULL;
254 }
255
0869aea0 256 return remove_monitor_info(local, origskb);
b2e7771e
JB		 257 }
258
0869aea0 259 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 260 /* only need to expand headroom if necessary */
261 skb = origskb;
262 origskb = NULL;
263
264 /*
265 * This shouldn't trigger often because most devices have an
266 * RX header they pull before we get here, and that should
267 * be big enough for our radiotap information. We should
268 * probably export the length to drivers so that we can have
269 * them allocate enough headroom to start with.
270 */
271 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 272 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 273 dev_kfree_skb(skb);
274 return NULL;
275 }
276 } else {
277 /*
278 * Need to make a copy and possibly remove radiotap header
279 * and FCS from the original.
280 */
281 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
282
0869aea0 283 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 284
285 if (!skb)
286 return origskb;
287 }
288
0869aea0
JB		 289 /* prepend radiotap information */
290 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 291
ce3edf6d 292 skb_reset_mac_header(skb);
b2e7771e
JB		 293 skb->ip_summed = CHECKSUM_UNNECESSARY;
294 skb->pkt_type = PACKET_OTHERHOST;
295 skb->protocol = htons(ETH_P_802_2);
296
297 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 298 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 299 continue;
300
3d30d949
MW		 301 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
302 continue;
303
9607e6b6 304 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 305 continue;
306
b2e7771e
JB		 307 if (prev_dev) {
308 skb2 = skb_clone(skb, GFP_ATOMIC);
309 if (skb2) {
310 skb2->dev = prev_dev;
5548a8a1 311 netif_receive_skb(skb2);
b2e7771e
JB		 312 }
313 }
314
315 prev_dev = sdata->dev;
316 sdata->dev->stats.rx_packets++;
317 sdata->dev->stats.rx_bytes += skb->len;
318 }
319
320 if (prev_dev) {
321 skb->dev = prev_dev;
5548a8a1 322 netif_receive_skb(skb);
b2e7771e
JB		 323 } else
324 dev_kfree_skb(skb);
325
326 return origskb;
327}
328
329
5cf121c3 330static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 331{
238f74a2 332 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 333 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
6e0d114d
JB		 334 int tid;
335
336 /* does the frame have a qos control field? */
238f74a2
HH		 337 if (ieee80211_is_data_qos(hdr->frame_control)) {
338 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 339 /* frame has qos control */
238f74a2
HH		 340 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
341 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
554891e6 342 status->rx_flags |= IEEE80211_RX_AMSDU;
6e0d114d 343 } else {
1411f9b5
JB		 344 /*
345 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
346 *
347 * Sequence numbers for management frames, QoS data
348 * frames with a broadcast/multicast address in the
349 * Address 1 field, and all non-QoS data frames sent
350 * by QoS STAs are assigned using an additional single
351 * modulo-4096 counter, [...]
352 *
353 * We also use that counter for non-QoS STAs.
354 */
355 tid = NUM_RX_DATA_QUEUES - 1;
6e0d114d 356 }
52865dfd 357
5cf121c3 358 rx->queue = tid;
6e0d114d
JB		 359 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
360 * For now, set skb->priority to 0 for other cases. */
361 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 362}
6e0d114d 363
d1c3a37c
JB		 364/**
365 * DOC: Packet alignment
366 *
367 * Drivers always need to pass packets that are aligned to two-byte boundaries
368 * to the stack.
369 *
370 * Additionally, should, if possible, align the payload data in a way that
371 * guarantees that the contained IP header is aligned to a four-byte
372 * boundary. In the case of regular frames, this simply means aligning the
373 * payload to a four-byte boundary (because either the IP header is directly
374 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 375 * in front of it). If the payload data is not properly aligned and the
376 * architecture doesn't support efficient unaligned operations, mac80211
377 * will align the data.
d1c3a37c
JB		 378 *
379 * With A-MSDU frames, however, the payload data address must yield two modulo
380 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
381 * push the IP header further back to a multiple of four again. Thankfully, the
382 * specs were sane enough this time around to require padding each A-MSDU
383 * subframe to a length that is a multiple of four.
384 *
385 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
386 * the payload is not supported, the driver is required to move the 802.11
387 * header to be directly in front of the payload in that case.
388 */
389static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 390{
59d9cb07
KV		 391#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
392 WARN_ONCE((unsigned long)rx->skb->data & 1,
393 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 394#endif
6e0d114d
JB		 395}
396
6368e4b1 397
571ecf67
JB		 398/* rx handlers */
399
49461622 400static ieee80211_rx_result debug_noinline
5cf121c3 401ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 402{
403 struct ieee80211_local *local = rx->local;
554891e6 404 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 405 struct sk_buff *skb = rx->skb;
406
554891e6 407 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN)))
4080c7cd
JB		 408 return RX_CONTINUE;
409
b23b025f
BG		 410 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
411 test_bit(SCAN_SW_SCANNING, &local->scanning))
f1d58c25 412 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 413
4080c7cd
JB		 414 /* scanning finished during invoking of handlers */
415 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
416 return RX_DROP_UNUSABLE;
571ecf67
JB		 417}
418
3cfcf6ac
JM		 419
420static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
421{
422 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
423
424 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
425 return 0;
426
427 return ieee80211_is_robust_mgmt_frame(hdr);
428}
429
430
431static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
432{
433 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
434
435 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
436 return 0;
437
438 return ieee80211_is_robust_mgmt_frame(hdr);
439}
440
441
442/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
443static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
444{
445 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
446 struct ieee80211_mmie *mmie;
447
448 if (skb->len < 24 + sizeof(*mmie) ||
449 !is_multicast_ether_addr(hdr->da))
450 return -1;
451
452 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
453 return -1; /* not a robust management frame */
454
455 mmie = (struct ieee80211_mmie *)
456 (skb->data + skb->len - sizeof(*mmie));
457 if (mmie->element_id != WLAN_EID_MMIE ||
458 mmie->length != sizeof(*mmie) - 2)
459 return -1;
460
461 return le16_to_cpu(mmie->key_id);
462}
463
464
33b64eb2 465static ieee80211_rx_result
5cf121c3 466ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 467{
a7767f95
HH		 468 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
469 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
47846c9b 470 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 471
a7767f95 472 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 473 if (is_multicast_ether_addr(hdr->addr1)) {
474 if (ieee80211_has_tods(hdr->frame_control) ||
475 !ieee80211_has_fromds(hdr->frame_control))
476 return RX_DROP_MONITOR;
477 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
478 return RX_DROP_MONITOR;
479 } else {
480 if (!ieee80211_has_a4(hdr->frame_control))
481 return RX_DROP_MONITOR;
482 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
483 return RX_DROP_MONITOR;
484 }
33b64eb2
LCC		 485 }
486
487 /* If there is not an established peer link and this is not a peer link
488 * establisment frame, beacon or probe, drop the frame.
489 */
490
b4e08ea1 491 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
33b64eb2 492 struct ieee80211_mgmt *mgmt;
d6d1a5a7 493
a7767f95 494 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 495 return RX_DROP_MONITOR;
496
a7767f95 497 if (ieee80211_is_action(hdr->frame_control)) {
33b64eb2 498 mgmt = (struct ieee80211_mgmt *)hdr;
97ad9139 499 if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
33b64eb2 500 return RX_DROP_MONITOR;
33b64eb2 501 return RX_CONTINUE;
33b64eb2
LCC		 502 }
503
a7767f95
HH		 504 if (ieee80211_is_probe_req(hdr->frame_control) ||
505 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 506 ieee80211_is_beacon(hdr->frame_control) ||
507 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 508 return RX_CONTINUE;
509
510 return RX_DROP_MONITOR;
511
512 }
513
514#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
515
516 if (ieee80211_is_data(hdr->frame_control) &&
517 is_multicast_ether_addr(hdr->addr1) &&
3c5772a5 518 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
33b64eb2 519 return RX_DROP_MONITOR;
902acc78 520#undef msh_h_get
d6d1a5a7 521
902acc78
JB		 522 return RX_CONTINUE;
523}
33b64eb2 524
1edfb1af
JB		 525#define SEQ_MODULO 0x1000
526#define SEQ_MASK 0xfff
527
528static inline int seq_less(u16 sq1, u16 sq2)
529{
530 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
531}
532
533static inline u16 seq_inc(u16 sq)
534{
535 return (sq + 1) & SEQ_MASK;
536}
537
538static inline u16 seq_sub(u16 sq1, u16 sq2)
539{
540 return (sq1 - sq2) & SEQ_MASK;
541}
542
543
544static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
545 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 546 int index)
1edfb1af 547{
24a8fdad 548 struct ieee80211_local *local = hw_to_local(hw);
1edfb1af 549 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 550 struct ieee80211_rx_status *status;
1edfb1af 551
dd318575
JB		 552 lockdep_assert_held(&tid_agg_rx->reorder_lock);
553
1edfb1af
JB		 554 if (!skb)
555 goto no_frame;
556
071d9ac2 557 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 558 tid_agg_rx->stored_mpdu_num--;
559 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 560 status = IEEE80211_SKB_RXCB(skb);
561 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 562 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 563
564no_frame:
565 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
566}
567
568static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
569 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 570 u16 head_seq_num)
1edfb1af
JB		 571{
572 int index;
573
dd318575
JB		 574 lockdep_assert_held(&tid_agg_rx->reorder_lock);
575
1edfb1af
JB		 576 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
577 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
578 tid_agg_rx->buf_size;
24a8fdad 579 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
1edfb1af
JB		 580 }
581}
582
583/*
584 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
585 * the skb was added to the buffer longer than this time ago, the earlier
586 * frames that have not yet been received are assumed to be lost and the skb
587 * can be released for processing. This may also release other skb's from the
588 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 589 *
590 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 591 */
592#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
593
aa0c8636 594static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
24a8fdad 595 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 596{
2bff8ebf 597 int index, j;
aa0c8636 598
dd318575
JB		 599 lockdep_assert_held(&tid_agg_rx->reorder_lock);
600
aa0c8636
CL		 601 /* release the buffer until next missing frame */
602 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
603 tid_agg_rx->buf_size;
604 if (!tid_agg_rx->reorder_buf[index] &&
605 tid_agg_rx->stored_mpdu_num > 1) {
606 /*
607 * No buffers ready to be released, but check whether any
608 * frames in the reorder buffer have timed out.
609 */
aa0c8636
CL		 610 int skipped = 1;
611 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
612 j = (j + 1) % tid_agg_rx->buf_size) {
613 if (!tid_agg_rx->reorder_buf[j]) {
614 skipped++;
615 continue;
616 }
499fe9a4
DH		 617 if (skipped &&
618 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 619 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 620 goto set_release_timer;
aa0c8636
CL		 621
622#ifdef CONFIG_MAC80211_HT_DEBUG
623 if (net_ratelimit())
0fb9a9ec
JP		 624 wiphy_debug(hw->wiphy,
625 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636 626#endif
24a8fdad 627 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
aa0c8636
CL		 628
629 /*
630 * Increment the head seq# also for the skipped slots.
631 */
632 tid_agg_rx->head_seq_num =
633 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
634 skipped = 0;
635 }
636 } else while (tid_agg_rx->reorder_buf[index]) {
24a8fdad 637 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
aa0c8636
CL		 638 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
639 tid_agg_rx->buf_size;
640 }
2bff8ebf
CL		 641
642 if (tid_agg_rx->stored_mpdu_num) {
643 j = index = seq_sub(tid_agg_rx->head_seq_num,
644 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
645
646 for (; j != (index - 1) % tid_agg_rx->buf_size;
647 j = (j + 1) % tid_agg_rx->buf_size) {
648 if (tid_agg_rx->reorder_buf[j])
649 break;
650 }
651
652 set_release_timer:
653
654 mod_timer(&tid_agg_rx->reorder_timer,
334df731 655 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 656 HT_RX_REORDER_BUF_TIMEOUT);
657 } else {
658 del_timer(&tid_agg_rx->reorder_timer);
659 }
aa0c8636
CL		 660}
661
1edfb1af
JB		 662/*
663 * As this function belongs to the RX path it must be under
664 * rcu_read_lock protection. It returns false if the frame
665 * can be processed immediately, true if it was consumed.
666 */
667static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
668 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 669 struct sk_buff *skb)
1edfb1af
JB		 670{
671 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
672 u16 sc = le16_to_cpu(hdr->seq_ctrl);
673 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
674 u16 head_seq_num, buf_size;
675 int index;
2bff8ebf 676 bool ret = true;
1edfb1af 677
dd318575
JB		 678 spin_lock(&tid_agg_rx->reorder_lock);
679
1edfb1af
JB		 680 buf_size = tid_agg_rx->buf_size;
681 head_seq_num = tid_agg_rx->head_seq_num;
682
683 /* frame with out of date sequence number */
684 if (seq_less(mpdu_seq_num, head_seq_num)) {
685 dev_kfree_skb(skb);
2bff8ebf 686 goto out;
1edfb1af
JB		 687 }
688
689 /*
690 * If frame the sequence number exceeds our buffering window
691 * size release some previous frames to make room for this one.
692 */
693 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
694 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
695 /* release stored frames up to new head to stack */
24a8fdad 696 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
1edfb1af
JB		 697 }
698
699 /* Now the new frame is always in the range of the reordering buffer */
700
701 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
702
703 /* check if we already stored this frame */
704 if (tid_agg_rx->reorder_buf[index]) {
705 dev_kfree_skb(skb);
2bff8ebf 706 goto out;
1edfb1af
JB		 707 }
708
709 /*
710 * If the current MPDU is in the right order and nothing else
711 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 712 * If it is first but there's something stored, we may be able
713 * to release frames after this one.
1edfb1af
JB		 714 */
715 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
716 tid_agg_rx->stored_mpdu_num == 0) {
717 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 718 ret = false;
719 goto out;
1edfb1af
JB		 720 }
721
722 /* put the frame in the reordering buffer */
723 tid_agg_rx->reorder_buf[index] = skb;
724 tid_agg_rx->reorder_time[index] = jiffies;
725 tid_agg_rx->stored_mpdu_num++;
24a8fdad 726 ieee80211_sta_reorder_release(hw, tid_agg_rx);
1edfb1af 727
2bff8ebf
CL		 728 out:
729 spin_unlock(&tid_agg_rx->reorder_lock);
730 return ret;
1edfb1af
JB		 731}
732
733/*
734 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
735 * true if the MPDU was buffered, false if it should be processed.
736 */
24a8fdad 737static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 738{
2569a826
JB		 739 struct sk_buff *skb = rx->skb;
740 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 741 struct ieee80211_hw *hw = &local->hw;
742 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 743 struct sta_info *sta = rx->sta;
1edfb1af
JB		 744 struct tid_ampdu_rx *tid_agg_rx;
745 u16 sc;
746 int tid;
747
748 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 749 goto dont_reorder;
1edfb1af
JB		 750
751 /*
752 * filter the QoS data rx stream according to
753 * STA/TID and check if this STA/TID is on aggregation
754 */
755
1edfb1af 756 if (!sta)
2569a826 757 goto dont_reorder;
1edfb1af
JB		 758
759 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
760
a87f736d
JB		 761 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
762 if (!tid_agg_rx)
763 goto dont_reorder;
1edfb1af
JB		 764
765 /* qos null data frames are excluded */
766 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 767 goto dont_reorder;
1edfb1af
JB		 768
769 /* new, potentially un-ordered, ampdu frame - process it */
770
771 /* reset session timer */
772 if (tid_agg_rx->timeout)
773 mod_timer(&tid_agg_rx->session_timer,
774 TU_TO_EXP_TIME(tid_agg_rx->timeout));
775
776 /* if this mpdu is fragmented - terminate rx aggregation session */
777 sc = le16_to_cpu(hdr->seq_ctrl);
778 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 779 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 780 skb_queue_tail(&rx->sdata->skb_queue, skb);
781 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 782 return;
1edfb1af
JB		 783 }
784
a87f736d
JB		 785 /*
786 * No locking needed -- we will only ever process one
787 * RX packet at a time, and thus own tid_agg_rx. All
788 * other code manipulating it needs to (and does) make
789 * sure that we cannot get to it any more before doing
790 * anything with it.
791 */
24a8fdad 792 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
2569a826
JB		 793 return;
794
795 dont_reorder:
24a8fdad 796 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 797}
33b64eb2 798
49461622 799static ieee80211_rx_result debug_noinline
5cf121c3 800ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 801{
a7767f95 802 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 803 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 804
805 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
806 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 807 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
5cf121c3 808 rx->sta->last_seq_ctrl[rx->queue] ==
571ecf67 809 hdr->seq_ctrl)) {
554891e6 810 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 811 rx->local->dot11FrameDuplicateCount++;
812 rx->sta->num_duplicates++;
813 }
b1f93314 814 return RX_DROP_UNUSABLE;
571ecf67 815 } else
5cf121c3 816 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
571ecf67
JB		 817 }
818
571ecf67
JB		 819 if (unlikely(rx->skb->len < 16)) {
820 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 821 return RX_DROP_MONITOR;
571ecf67
JB		 822 }
823
571ecf67
JB		 824 /* Drop disallowed frame classes based on STA auth/assoc state;
825 * IEEE 802.11, Chap 5.5.
826 *
ccd7b362
JB		 827 * mac80211 filters only based on association state, i.e. it drops
828 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 829 * deauth/disassoc frames when needed. In addition, hostapd is
830 * responsible for filtering on both auth and assoc states.
831 */
33b64eb2 832
902acc78 833 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 834 return ieee80211_rx_mesh_check(rx);
33b64eb2 835
a7767f95
HH		 836 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
837 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 838 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 839 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
0c2530ce 840 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC))))
e4c26add 841 return RX_DROP_MONITOR;
571ecf67 842
9ae54c84 843 return RX_CONTINUE;
570bd537
JB		 844}
845
846
49461622 847static ieee80211_rx_result debug_noinline
5cf121c3 848ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 849{
eb9fb5b8
JB		 850 struct sk_buff *skb = rx->skb;
851 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
852 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 853 int keyidx;
854 int hdrlen;
e4c26add 855 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 856 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 857 int mmie_keyidx = -1;
761ab470 858 __le16 fc;
570bd537 859
3017b80b
JB		 860 /*
861 * Key selection 101
862 *
3cfcf6ac 863 * There are four types of keys:
3017b80b 864 * - GTK (group keys)
3cfcf6ac 865 * - IGTK (group keys for management frames)
3017b80b
JB		 866 * - PTK (pairwise keys)
867 * - STK (station-to-station pairwise keys)
868 *
869 * When selecting a key, we have to distinguish between multicast
870 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 871 * use PTKs and STKs while the former always use GTKs and IGTKs.
872 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
873 * unicast frames can also use key indices like GTKs. Hence, if we
874 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 875 *
8dc06a1c
JB		 876 * Note that in a regular BSS, multicast frames are sent by the
877 * AP only, associated stations unicast the frame to the AP first
878 * which then multicasts it on their behalf.
879 *
3017b80b
JB		 880 * There is also a slight problem in IBSS mode: GTKs are negotiated
881 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 882 * The spec seems to expect that one negotiates the same key with
883 * every station but there's no such requirement; VLANs could be
884 * possible.
3017b80b
JB		 885 */
886
3017b80b 887 /*
1990af8d 888 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 889 * addressed to us nor a multicast frame.
890 */
554891e6 891 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 892 return RX_CONTINUE;
3017b80b 893
2569a826
JB		 894 /* start without a key */
895 rx->key = NULL;
896
d4e46a3d 897 if (rx->sta)
e31b8213 898 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 899
761ab470
JB		 900 fc = hdr->frame_control;
901
902 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 903 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
904
e31b8213
JB		 905 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
906 rx->key = sta_ptk;
dc1580dd
JB		 907 if ((status->flag & RX_FLAG_DECRYPTED) &&
908 (status->flag & RX_FLAG_IV_STRIPPED))
909 return RX_CONTINUE;
0c7c10c7 910 /* Skip decryption if the frame is not protected. */
761ab470 911 if (!ieee80211_has_protected(fc))
0c7c10c7 912 return RX_CONTINUE;
3cfcf6ac
JM		 913 } else if (mmie_keyidx >= 0) {
914 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 915 if ((status->flag & RX_FLAG_DECRYPTED) &&
916 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 917 return RX_CONTINUE;
918
919 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
920 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
921 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 922 if (rx->sta)
923 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
924 if (!rx->key)
925 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 926 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 927 /*
928 * The frame was not protected, so skip decryption. However, we
929 * need to set rx->key if there is a key that could have been
930 * used so that the frame may be dropped if encryption would
931 * have been expected.
932 */
933 struct ieee80211_key *key = NULL;
897bed8b
JB		 934 struct ieee80211_sub_if_data *sdata = rx->sdata;
935 int i;
936
761ab470 937 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 938 is_multicast_ether_addr(hdr->addr1) &&
939 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
940 rx->key = key;
897bed8b
JB		 941 else {
942 if (rx->sta) {
943 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
944 key = rcu_dereference(rx->sta->gtk[i]);
945 if (key)
946 break;
947 }
948 }
949 if (!key) {
950 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
951 key = rcu_dereference(sdata->keys[i]);
952 if (key)
953 break;
954 }
955 }
956 if (key)
957 rx->key = key;
958 }
0c7c10c7 959 return RX_CONTINUE;
571ecf67 960 } else {
39184b15 961 u8 keyid;
3017b80b
JB		 962 /*
963 * The device doesn't give us the IV so we won't be
964 * able to look up the key. That's ok though, we
965 * don't need to decrypt the frame, we just won't
966 * be able to keep statistics accurate.
967 * Except for key threshold notifications, should
968 * we somehow allow the driver to tell us which key
969 * the hardware used if this flag is set?
970 */
eb9fb5b8
JB		 971 if ((status->flag & RX_FLAG_DECRYPTED) &&
972 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 973 return RX_CONTINUE;
3017b80b 974
761ab470 975 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 976
977 if (rx->skb->len < 8 + hdrlen)
e4c26add 978 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 979
980 /*
981 * no need to call ieee80211_wep_get_keyidx,
982 * it verifies a bunch of things we've done already
983 */
39184b15
ZY		 984 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
985 keyidx = keyid >> 6;
3017b80b 986
e31b8213
JB		 987 /* check per-station GTK first, if multicast packet */
988 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
989 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 990
e31b8213
JB		 991 /* if not found, try default key */
992 if (!rx->key) {
993 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
994
995 /*
996 * RSNA-protected unicast frames should always be
997 * sent with pairwise or station-to-station keys,
998 * but for WEP we allow using a key index as well.
999 */
1000 if (rx->key &&
1001 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1002 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1003 !is_multicast_ether_addr(hdr->addr1))
1004 rx->key = NULL;
1005 }
571ecf67
JB		 1006 }
1007
3017b80b 1008 if (rx->key) {
571ecf67 1009 rx->key->tx_rx_count++;
011bfcc4 1010 /* TODO: add threshold stuff again */
1990af8d 1011 } else {
e4c26add 1012 return RX_DROP_MONITOR;
70f08765
JB		 1013 }
1014
39184b15
ZY		 1015 if (skb_linearize(rx->skb))
1016 return RX_DROP_UNUSABLE;
761ab470 1017 /* the hdr variable is invalid now! */
1990af8d 1018
97359d12
JB		 1019 switch (rx->key->conf.cipher) {
1020 case WLAN_CIPHER_SUITE_WEP40:
1021 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1022 /* Check for weak IVs if possible */
1023 if (rx->sta && ieee80211_is_data(fc) &&
1024 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1025 !(status->flag & RX_FLAG_DECRYPTED)) &&
1026 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1027 rx->sta->wep_weak_iv_count++;
1028
e2f036da
MN		 1029 result = ieee80211_crypto_wep_decrypt(rx);
1030 break;
97359d12 1031 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1032 result = ieee80211_crypto_tkip_decrypt(rx);
1033 break;
97359d12 1034 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1035 result = ieee80211_crypto_ccmp_decrypt(rx);
1036 break;
97359d12 1037 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1038 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1039 break;
3ffc2a90
JB		 1040 default:
1041 /*
1042 * We can reach here only with HW-only algorithms
1043 * but why didn't it decrypt the frame?!
1044 */
1045 return RX_DROP_UNUSABLE;
70f08765
JB		 1046 }
1047
e2f036da 1048 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1049 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1050
1051 return result;
70f08765
JB		 1052}
1053
572e0012
KV		 1054static ieee80211_rx_result debug_noinline
1055ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1056{
1057 struct ieee80211_local *local;
1058 struct ieee80211_hdr *hdr;
1059 struct sk_buff *skb;
1060
1061 local = rx->local;
1062 skb = rx->skb;
1063 hdr = (struct ieee80211_hdr *) skb->data;
1064
1065 if (!local->pspolling)
1066 return RX_CONTINUE;
1067
1068 if (!ieee80211_has_fromds(hdr->frame_control))
1069 /* this is not from AP */
1070 return RX_CONTINUE;
1071
1072 if (!ieee80211_is_data(hdr->frame_control))
1073 return RX_CONTINUE;
1074
1075 if (!ieee80211_has_moredata(hdr->frame_control)) {
1076 /* AP has no more frames buffered for us */
1077 local->pspolling = false;
1078 return RX_CONTINUE;
1079 }
1080
1081 /* more data bit is set, let's request a new frame from the AP */
1082 ieee80211_send_pspoll(local, rx->sdata);
1083
1084 return RX_CONTINUE;
1085}
1086
133b8226 1087static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1088{
133b8226 1089 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1090 struct ieee80211_local *local = sdata->local;
0795af57 1091
3e122be0 1092 atomic_inc(&sdata->bss->num_sta_ps);
af818581 1093 set_sta_flags(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1094 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1095 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1096#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1097 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1098 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1099#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1100}
1101
ff9458d3 1102static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1103{
133b8226 1104 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1105
3e122be0 1106 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1107
571ecf67 1108#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1109 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1110 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1111#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1112
af818581 1113 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1114#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1115 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1116 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1117#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1118 return;
1119 }
1120
1121 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1122}
1123
d057e5a3
AN		 1124int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1125{
1126 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1127 bool in_ps;
1128
1129 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1130
1131 /* Don't let the same PS state be set twice */
1132 in_ps = test_sta_flags(sta_inf, WLAN_STA_PS_STA);
1133 if ((start && in_ps) || (!start && !in_ps))
1134 return -EINVAL;
1135
1136 if (start)
1137 ap_sta_ps_start(sta_inf);
1138 else
1139 ap_sta_ps_end(sta_inf);
1140
1141 return 0;
1142}
1143EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1144
49461622 1145static ieee80211_rx_result debug_noinline
5cf121c3 1146ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1147{
1148 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1149 struct sk_buff *skb = rx->skb;
1150 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1151 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1152
1153 if (!sta)
9ae54c84 1154 return RX_CONTINUE;
571ecf67 1155
b291ba11
JB		 1156 /*
1157 * Update last_rx only for IBSS packets which are for the current
1158 * BSSID to avoid keeping the current IBSS network alive in cases
1159 * where other STAs start using different BSSID.
1160 */
05c914fe 1161 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1162 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1163 NL80211_IFTYPE_ADHOC);
3af6334c 1164 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
571ecf67 1165 sta->last_rx = jiffies;
3af6334c
FF		 1166 if (ieee80211_is_data(hdr->frame_control)) {
1167 sta->last_rx_rate_idx = status->rate_idx;
1168 sta->last_rx_rate_flag = status->flag;
1169 }
1170 }
b291ba11
JB		 1171 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1172 /*
33b64eb2
LCC		 1173 * Mesh beacons will update last_rx when if they are found to
1174 * match the current local configuration when processed.
571ecf67 1175 */
b291ba11 1176 sta->last_rx = jiffies;
3af6334c
FF		 1177 if (ieee80211_is_data(hdr->frame_control)) {
1178 sta->last_rx_rate_idx = status->rate_idx;
1179 sta->last_rx_rate_flag = status->flag;
1180 }
571ecf67
JB		 1181 }
1182
554891e6 1183 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1184 return RX_CONTINUE;
571ecf67 1185
3cf335d5
KV		 1186 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1187 ieee80211_sta_rx_notify(rx->sdata, hdr);
1188
571ecf67
JB		 1189 sta->rx_fragments++;
1190 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1191 sta->last_signal = status->signal;
541a45a1 1192 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1193
72eaa43a
JB		 1194 /*
1195 * Change STA power saving mode only at the end of a frame
1196 * exchange sequence.
1197 */
d057e5a3
AN		 1198 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1199 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1200 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1201 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1202 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 1203 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1204 /*
1205 * Ignore doze->wake transitions that are
1206 * indicated by non-data frames, the standard
1207 * is unclear here, but for example going to
1208 * PS mode and then scanning would cause a
1209 * doze->wake transition for the probe request,
1210 * and that is clearly undesirable.
1211 */
1212 if (ieee80211_is_data(hdr->frame_control) &&
1213 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1214 ap_sta_ps_end(sta);
72eaa43a
JB		 1215 } else {
1216 if (ieee80211_has_pm(hdr->frame_control))
1217 ap_sta_ps_start(sta);
1218 }
571ecf67
JB		 1219 }
1220
22403def
JB		 1221 /*
1222 * Drop (qos-)data::nullfunc frames silently, since they
1223 * are used only to control station power saving mode.
1224 */
1225 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1226 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1227 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1228
1229 /*
1230 * If we receive a 4-addr nullfunc frame from a STA
1231 * that was not moved to a 4-addr STA vlan yet, drop
1232 * the frame to the monitor interface, to make sure
1233 * that hostapd sees it
1234 */
1235 if (ieee80211_has_a4(hdr->frame_control) &&
1236 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1237 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1238 !rx->sdata->u.vlan.sta)))
1239 return RX_DROP_MONITOR;
22403def
JB		 1240 /*
1241 * Update counter and free packet here to avoid
1242 * counting this as a dropped packed.
1243 */
571ecf67
JB		 1244 sta->rx_packets++;
1245 dev_kfree_skb(rx->skb);
9ae54c84 1246 return RX_QUEUED;
571ecf67
JB		 1247 }
1248
9ae54c84 1249 return RX_CONTINUE;
571ecf67
JB		 1250} /* ieee80211_rx_h_sta_process */
1251
571ecf67
JB		 1252static inline struct ieee80211_fragment_entry *
1253ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1254 unsigned int frag, unsigned int seq, int rx_queue,
1255 struct sk_buff **skb)
1256{
1257 struct ieee80211_fragment_entry *entry;
1258 int idx;
1259
1260 idx = sdata->fragment_next;
1261 entry = &sdata->fragments[sdata->fragment_next++];
1262 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1263 sdata->fragment_next = 0;
1264
1265 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1266#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1267 struct ieee80211_hdr *hdr =
1268 (struct ieee80211_hdr *) entry->skb_list.next->data;
1269 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1270 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1271 "addr1=%pM addr2=%pM\n",
47846c9b 1272 sdata->name, idx,
571ecf67 1273 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1274 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1275#endif
571ecf67
JB		 1276 __skb_queue_purge(&entry->skb_list);
1277 }
1278
1279 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1280 *skb = NULL;
1281 entry->first_frag_time = jiffies;
1282 entry->seq = seq;
1283 entry->rx_queue = rx_queue;
1284 entry->last_frag = frag;
1285 entry->ccmp = 0;
1286 entry->extra_len = 0;
1287
1288 return entry;
1289}
1290
1291static inline struct ieee80211_fragment_entry *
1292ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1293 unsigned int frag, unsigned int seq,
571ecf67
JB		 1294 int rx_queue, struct ieee80211_hdr *hdr)
1295{
1296 struct ieee80211_fragment_entry *entry;
1297 int i, idx;
1298
1299 idx = sdata->fragment_next;
1300 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1301 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1302
1303 idx--;
1304 if (idx < 0)
1305 idx = IEEE80211_FRAGMENT_MAX - 1;
1306
1307 entry = &sdata->fragments[idx];
1308 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1309 entry->rx_queue != rx_queue ||
1310 entry->last_frag + 1 != frag)
1311 continue;
1312
b73d70ad 1313 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1314
b73d70ad
HH		 1315 /*
1316 * Check ftype and addresses are equal, else check next fragment
1317 */
1318 if (((hdr->frame_control ^ f_hdr->frame_control) &
1319 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1320 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1321 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1322 continue;
1323
ab46623e 1324 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1325 __skb_queue_purge(&entry->skb_list);
1326 continue;
1327 }
1328 return entry;
1329 }
1330
1331 return NULL;
1332}
1333
49461622 1334static ieee80211_rx_result debug_noinline
5cf121c3 1335ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1336{
1337 struct ieee80211_hdr *hdr;
1338 u16 sc;
358c8d9d 1339 __le16 fc;
571ecf67
JB		 1340 unsigned int frag, seq;
1341 struct ieee80211_fragment_entry *entry;
1342 struct sk_buff *skb;
554891e6 1343 struct ieee80211_rx_status *status;
571ecf67 1344
b73d70ad 1345 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1346 fc = hdr->frame_control;
571ecf67
JB		 1347 sc = le16_to_cpu(hdr->seq_ctrl);
1348 frag = sc & IEEE80211_SCTL_FRAG;
1349
358c8d9d 1350 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1351 (rx->skb)->len < 24 ||
1352 is_multicast_ether_addr(hdr->addr1))) {
1353 /* not fragmented */
1354 goto out;
1355 }
1356 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1357
e3cf8b3f
ZY		 1358 if (skb_linearize(rx->skb))
1359 return RX_DROP_UNUSABLE;
1360
058897a4
AK		 1361 /*
1362 * skb_linearize() might change the skb->data and
1363 * previously cached variables (in this case, hdr) need to
1364 * be refreshed with the new data.
1365 */
1366 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1367 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1368
1369 if (frag == 0) {
1370 /* This is the first fragment of a new frame. */
1371 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 1372 rx->queue, &(rx->skb));
97359d12 1373 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1374 ieee80211_has_protected(fc)) {
9190252c
JM		 1375 int queue = ieee80211_is_mgmt(fc) ?
1376 NUM_RX_DATA_QUEUES : rx->queue;
571ecf67
JB		 1377 /* Store CCMP PN so that we can verify that the next
1378 * fragment has a sequential PN value. */
1379 entry->ccmp = 1;
1380 memcpy(entry->last_pn,
9190252c 1381 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1382 CCMP_PN_LEN);
1383 }
9ae54c84 1384 return RX_QUEUED;
571ecf67
JB		 1385 }
1386
1387 /* This is a fragment for a frame that should already be pending in
1388 * fragment cache. Add this fragment to the end of the pending entry.
1389 */
b73d70ad 1390 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 1391 if (!entry) {
1392 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1393 return RX_DROP_MONITOR;
571ecf67
JB		 1394 }
1395
1396 /* Verify that MPDUs within one MSDU have sequential PN values.
1397 * (IEEE 802.11i, 8.3.3.4.5) */
1398 if (entry->ccmp) {
1399 int i;
1400 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1401 int queue;
97359d12 1402 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1403 return RX_DROP_UNUSABLE;
571ecf67
JB		 1404 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1405 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1406 pn[i]++;
1407 if (pn[i])
1408 break;
1409 }
9190252c
JM		 1410 queue = ieee80211_is_mgmt(fc) ?
1411 NUM_RX_DATA_QUEUES : rx->queue;
1412 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1413 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1414 return RX_DROP_UNUSABLE;
571ecf67
JB		 1415 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1416 }
1417
358c8d9d 1418 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1419 __skb_queue_tail(&entry->skb_list, rx->skb);
1420 entry->last_frag = frag;
1421 entry->extra_len += rx->skb->len;
358c8d9d 1422 if (ieee80211_has_morefrags(fc)) {
571ecf67 1423 rx->skb = NULL;
9ae54c84 1424 return RX_QUEUED;
571ecf67
JB		 1425 }
1426
1427 rx->skb = __skb_dequeue(&entry->skb_list);
1428 if (skb_tailroom(rx->skb) < entry->extra_len) {
1429 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1430 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1431 GFP_ATOMIC))) {
1432 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1433 __skb_queue_purge(&entry->skb_list);
e4c26add 1434 return RX_DROP_UNUSABLE;
571ecf67
JB		 1435 }
1436 }
1437 while ((skb = __skb_dequeue(&entry->skb_list))) {
1438 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1439 dev_kfree_skb(skb);
1440 }
1441
1442 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1443 status = IEEE80211_SKB_RXCB(rx->skb);
1444 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1445
1446 out:
1447 if (rx->sta)
1448 rx->sta->rx_packets++;
1449 if (is_multicast_ether_addr(hdr->addr1))
1450 rx->local->dot11MulticastReceivedFrameCount++;
1451 else
1452 ieee80211_led_rx(rx->local);
9ae54c84 1453 return RX_CONTINUE;
571ecf67
JB		 1454}
1455
49461622 1456static ieee80211_rx_result debug_noinline
5cf121c3 1457ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1458{
af818581 1459 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1460 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
554891e6 1461 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1462
358c8d9d 1463 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
554891e6 1464 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1465 return RX_CONTINUE;
571ecf67 1466
05c914fe
JB		 1467 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1468 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1469 return RX_DROP_UNUSABLE;
98f0b0a3 1470
af818581
JB		 1471 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1472 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1473 else
1474 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1475
9ae54c84 1476 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1477 * count as an dropped frame. */
1478 dev_kfree_skb(rx->skb);
1479
9ae54c84 1480 return RX_QUEUED;
571ecf67
JB		 1481}
1482
49461622 1483static ieee80211_rx_result debug_noinline
5cf121c3 1484ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1485{
6e0d114d 1486 u8 *data = rx->skb->data;
238f74a2 1487 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1488
238f74a2 1489 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1490 return RX_CONTINUE;
6e0d114d
JB		 1491
1492 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1493 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1494 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1495 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1496 /* change frame type to non QOS */
238f74a2 1497 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1498
9ae54c84 1499 return RX_CONTINUE;
6e0d114d
JB		 1500}
1501
76ee65bf 1502static int
5cf121c3 1503ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1504{
07346f81 1505 if (unlikely(!rx->sta ||
f4ea83dd 1506 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1507 return -EACCES;
571ecf67 1508
76ee65bf 1509 return 0;
571ecf67
JB		 1510}
1511
76ee65bf 1512static int
358c8d9d 1513ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1514{
eb9fb5b8
JB		 1515 struct sk_buff *skb = rx->skb;
1516 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1517
3017b80b 1518 /*
7848ba7d
JB		 1519 * Pass through unencrypted frames if the hardware has
1520 * decrypted them already.
3017b80b 1521 */
eb9fb5b8 1522 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1523 return 0;
571ecf67
JB		 1524
1525 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1526 if (unlikely(!ieee80211_has_protected(fc) &&
1527 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1528 ieee80211_is_data(fc) &&
b3fc9c6c 1529 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1530 return -EACCES;
bef5d1c7
JB		 1531
1532 return 0;
1533}
1534
1535static int
1536ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1537{
1538 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1539 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1540 __le16 fc = hdr->frame_control;
bef5d1c7 1541
e3efca0a
JM		 1542 /*
1543 * Pass through unencrypted frames if the hardware has
1544 * decrypted them already.
1545 */
1546 if (status->flag & RX_FLAG_DECRYPTED)
1547 return 0;
bef5d1c7 1548
f2ca3ea4 1549 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1550 if (unlikely(!ieee80211_has_protected(fc) &&
1551 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1552 rx->key)) {
1553 if (ieee80211_is_deauth(fc))
1554 cfg80211_send_unprot_deauth(rx->sdata->dev,
1555 rx->skb->data,
1556 rx->skb->len);
1557 else if (ieee80211_is_disassoc(fc))
1558 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1559 rx->skb->data,
1560 rx->skb->len);
f2ca3ea4 1561 return -EACCES;
cf4e594e 1562 }
f2ca3ea4 1563 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1564 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1565 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1566 if (ieee80211_is_deauth(fc))
1567 cfg80211_send_unprot_deauth(rx->sdata->dev,
1568 rx->skb->data,
1569 rx->skb->len);
1570 else if (ieee80211_is_disassoc(fc))
1571 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1572 rx->skb->data,
1573 rx->skb->len);
f2ca3ea4 1574 return -EACCES;
cf4e594e 1575 }
f2ca3ea4
JM		 1576 /*
1577 * When using MFP, Action frames are not allowed prior to
1578 * having configured keys.
1579 */
1580 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1581 ieee80211_is_robust_mgmt_frame(
1582 (struct ieee80211_hdr *) rx->skb->data)))
1583 return -EACCES;
1584 }
b3fc9c6c 1585
76ee65bf 1586 return 0;
571ecf67
JB		 1587}
1588
76ee65bf 1589static int
4114fa21 1590__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1591{
eb9fb5b8 1592 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1593 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1594 bool check_port_control = false;
1595 struct ethhdr *ehdr;
1596 int ret;
f14543ee 1597
4114fa21 1598 *port_control = false;
9bc383de
JB		 1599 if (ieee80211_has_a4(hdr->frame_control) &&
1600 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1601 return -1;
9bc383de 1602
fbb327c5
FF		 1603 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1604 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1605
1606 if (!sdata->u.mgd.use_4addr)
1607 return -1;
1608 else
1609 check_port_control = true;
1610 }
1611
9bc383de 1612 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1613 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1614 return -1;
571ecf67 1615
fbb327c5 1616 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1617 if (ret < 0)
fbb327c5
FF		 1618 return ret;
1619
1620 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1621 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1622 *port_control = true;
1623 else if (check_port_control)
fbb327c5
FF		 1624 return -1;
1625
1626 return 0;
76ee65bf 1627}
571ecf67 1628
ce3edf6d
JB		 1629/*
1630 * requires that rx->skb is a frame with ethernet header
1631 */
358c8d9d 1632static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1633{
c97c23e3 1634 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1635 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1636 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1637
1638 /*
1639 * Allow EAPOL frames to us/the PAE group address regardless
1640 * of whether the frame was encrypted or not.
1641 */
a621fa4d 1642 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1643 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1644 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1645 return true;
1646
1647 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1648 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1649 return false;
1650
1651 return true;
1652}
1653
1654/*
1655 * requires that rx->skb is a frame with ethernet header
1656 */
76ee65bf 1657static void
5cf121c3 1658ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1659{
eb9fb5b8
JB		 1660 struct ieee80211_sub_if_data *sdata = rx->sdata;
1661 struct net_device *dev = sdata->dev;
76ee65bf 1662 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1663 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1664 struct sta_info *dsta;
554891e6 1665 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1666
76ee65bf
RR		 1667 skb = rx->skb;
1668 xmit_skb = NULL;
571ecf67 1669
05c914fe
JB		 1670 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1671 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1672 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1673 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1674 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1675 if (is_multicast_ether_addr(ehdr->h_dest)) {
1676 /*
1677 * send multicast frames both to higher layers in
1678 * local net stack and back to the wireless medium
1679 */
76ee65bf
RR		 1680 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1681 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1682 printk(KERN_DEBUG "%s: failed to clone "
1683 "multicast frame\n", dev->name);
1684 } else {
abe60632
JB		 1685 dsta = sta_info_get(sdata, skb->data);
1686 if (dsta) {
ce3edf6d
JB		 1687 /*
1688 * The destination station is associated to
1689 * this AP (in this VLAN), so send the frame
1690 * directly to it and do not pass it to local
1691 * net stack.
571ecf67 1692 */
76ee65bf 1693 xmit_skb = skb;
571ecf67
JB		 1694 skb = NULL;
1695 }
571ecf67
JB		 1696 }
1697 }
1698
1699 if (skb) {
d1c3a37c
JB		 1700 int align __maybe_unused;
1701
59d9cb07 1702#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1703 /*
1704 * 'align' will only take the values 0 or 2 here
1705 * since all frames are required to be aligned
1706 * to 2-byte boundaries when being passed to
1707 * mac80211. That also explains the __skb_push()
1708 * below.
1709 */
dacb6f1d 1710 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1711 if (align) {
1712 if (WARN_ON(skb_headroom(skb) < 3)) {
1713 dev_kfree_skb(skb);
1714 skb = NULL;
1715 } else {
1716 u8 *data = skb->data;
8ce0b589
ZY		 1717 size_t len = skb_headlen(skb);
1718 skb->data -= align;
1719 memmove(skb->data, data, len);
1720 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1721 }
1722 }
1723#endif
1724
1725 if (skb) {
1726 /* deliver to local stack */
1727 skb->protocol = eth_type_trans(skb, dev);
1728 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1729 netif_receive_skb(skb);
d1c3a37c 1730 }
571ecf67
JB		 1731 }
1732
76ee65bf 1733 if (xmit_skb) {
571ecf67 1734 /* send to wireless media */
f831e909 1735 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1736 skb_reset_network_header(xmit_skb);
1737 skb_reset_mac_header(xmit_skb);
76ee65bf 1738 dev_queue_xmit(xmit_skb);
571ecf67 1739 }
76ee65bf
RR		 1740}
1741
49461622 1742static ieee80211_rx_result debug_noinline
5cf121c3 1743ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1744{
eb9fb5b8 1745 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1746 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1747 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1748 __le16 fc = hdr->frame_control;
eaf85ca7 1749 struct sk_buff_head frame_list;
554891e6 1750 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1751
358c8d9d 1752 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1753 return RX_CONTINUE;
fd4c7f2f 1754
358c8d9d 1755 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1756 return RX_DROP_MONITOR;
fd4c7f2f 1757
554891e6 1758 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1759 return RX_CONTINUE;
fd4c7f2f 1760
eaf85ca7
ZY		 1761 if (ieee80211_has_a4(hdr->frame_control) &&
1762 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1763 !rx->sdata->u.vlan.sta)
e4c26add 1764 return RX_DROP_UNUSABLE;
fd4c7f2f 1765
eaf85ca7
ZY		 1766 if (is_multicast_ether_addr(hdr->addr1) &&
1767 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1768 rx->sdata->u.vlan.sta) ||
1769 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1770 rx->sdata->u.mgd.use_4addr)))
e4c26add 1771 return RX_DROP_UNUSABLE;
fd4c7f2f 1772
eaf85ca7
ZY		 1773 skb->dev = dev;
1774 __skb_queue_head_init(&frame_list);
fd4c7f2f 1775
e3cf8b3f
ZY		 1776 if (skb_linearize(skb))
1777 return RX_DROP_UNUSABLE;
1778
eaf85ca7
ZY		 1779 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1780 rx->sdata->vif.type,
1781 rx->local->hw.extra_tx_headroom);
fd4c7f2f 1782
eaf85ca7
ZY		 1783 while (!skb_queue_empty(&frame_list)) {
1784 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1785
358c8d9d 1786 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1787 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1788 continue;
1789 }
eaf85ca7
ZY		 1790 dev->stats.rx_packets++;
1791 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1792
1793 ieee80211_deliver_skb(rx);
1794 }
1795
9ae54c84 1796 return RX_QUEUED;
fd4c7f2f
RR		 1797}
1798
bf94e17b 1799#ifdef CONFIG_MAC80211_MESH
b0dee578 1800static ieee80211_rx_result
e32f85f7
LCC		 1801ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1802{
1803 struct ieee80211_hdr *hdr;
1804 struct ieee80211s_hdr *mesh_hdr;
1805 unsigned int hdrlen;
1806 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1807 struct ieee80211_local *local = rx->local;
eb9fb5b8 1808 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1809 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
e32f85f7
LCC		 1810
1811 hdr = (struct ieee80211_hdr *) skb->data;
1812 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1813 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1814
1815 if (!ieee80211_is_data(hdr->frame_control))
1816 return RX_CONTINUE;
1817
1818 if (!mesh_hdr->ttl)
1819 /* illegal frame */
1820 return RX_DROP_MONITOR;
1821
43b7b314 1822 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1823 struct mesh_path *mppath;
43b7b314
JC		 1824 char *proxied_addr;
1825 char *mpp_addr;
1826
1827 if (is_multicast_ether_addr(hdr->addr1)) {
1828 mpp_addr = hdr->addr3;
1829 proxied_addr = mesh_hdr->eaddr1;
1830 } else {
1831 mpp_addr = hdr->addr4;
1832 proxied_addr = mesh_hdr->eaddr2;
1833 }
79617dee 1834
79617dee 1835 rcu_read_lock();
43b7b314 1836 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1837 if (!mppath) {
43b7b314 1838 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1839 } else {
1840 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1841 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1842 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1843 spin_unlock_bh(&mppath->state_lock);
1844 }
1845 rcu_read_unlock();
1846 }
1847
3c5772a5
JC		 1848 /* Frame has reached destination. Don't forward */
1849 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1850 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1851 return RX_CONTINUE;
1852
1853 mesh_hdr->ttl--;
1854
554891e6 1855 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1856 if (!mesh_hdr->ttl)
472dbc45 1857 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1858 dropped_frames_ttl);
1859 else {
1860 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1861 struct ieee80211_tx_info *info;
1862
e32f85f7
LCC		 1863 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1864
1865 if (!fwd_skb && net_ratelimit())
1866 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1867 sdata->name);
919bbad5 1868 if (!fwd_skb)
b51aff05 1869 goto out;
e32f85f7
LCC		 1870
1871 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1872 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1873 info = IEEE80211_SKB_CB(fwd_skb);
1874 memset(info, 0, sizeof(*info));
1875 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1876 info->control.vif = &rx->sdata->vif;
cf0277e7
JB		 1877 skb_set_queue_mapping(skb,
1878 ieee80211_select_queue(rx->sdata, fwd_skb));
1879 ieee80211_set_qos_hdr(local, skb);
c8a61a7d
DW		 1880 if (is_multicast_ether_addr(fwd_hdr->addr1))
1881 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1882 fwded_mcast);
1883 else {
3c5772a5
JC		 1884 int err;
1885 /*
1886 * Save TA to addr1 to send TA a path error if a
1887 * suitable next hop is not found
1888 */
1889 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1890 ETH_ALEN);
3c5772a5 1891 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1892 /* Failed to immediately resolve next hop:
1893 * fwded frame was dropped or will be added
1894 * later to the pending skb queue. */
1895 if (err)
1896 return RX_DROP_MONITOR;
c8a61a7d
DW		 1897
1898 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1899 fwded_unicast);
249b405c
JC		 1900 }
1901 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1902 fwded_frames);
3b8d81e0 1903 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1904 }
1905 }
1906
b51aff05 1907 out:
3c5772a5 1908 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1909 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1910 return RX_CONTINUE;
1911 else
1912 return RX_DROP_MONITOR;
1913}
bf94e17b 1914#endif
e32f85f7 1915
49461622 1916static ieee80211_rx_result debug_noinline
5cf121c3 1917ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1918{
eb9fb5b8 1919 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1920 struct ieee80211_local *local = rx->local;
eb9fb5b8 1921 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1922 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1923 __le16 fc = hdr->frame_control;
4114fa21 1924 bool port_control;
ce3edf6d 1925 int err;
76ee65bf 1926
358c8d9d 1927 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1928 return RX_CONTINUE;
76ee65bf 1929
358c8d9d 1930 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1931 return RX_DROP_MONITOR;
76ee65bf 1932
f14543ee
FF		 1933 /*
1934 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1935 * that a 4-addr station can be detected and moved into a separate VLAN
1936 */
1937 if (ieee80211_has_a4(hdr->frame_control) &&
1938 sdata->vif.type == NL80211_IFTYPE_AP)
1939 return RX_DROP_MONITOR;
1940
4114fa21 1941 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 1942 if (unlikely(err))
e4c26add 1943 return RX_DROP_UNUSABLE;
76ee65bf 1944
358c8d9d 1945 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1946 return RX_DROP_MONITOR;
ce3edf6d 1947
4114fa21
FF		 1948 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1949 unlikely(port_control) && sdata->bss) {
1950 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1951 u.ap);
1952 dev = sdata->dev;
1953 rx->sdata = sdata;
1954 }
1955
76ee65bf
RR		 1956 rx->skb->dev = dev;
1957
1958 dev->stats.rx_packets++;
1959 dev->stats.rx_bytes += rx->skb->len;
1960
08ca944e 1961 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 1962 !is_multicast_ether_addr(
1963 ((struct ethhdr *)rx->skb->data)->h_dest) &&
1964 (!local->scanning &&
1965 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 1966 mod_timer(&local->dynamic_ps_timer, jiffies +
1967 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1968 }
1969
76ee65bf 1970 ieee80211_deliver_skb(rx);
571ecf67 1971
9ae54c84 1972 return RX_QUEUED;
571ecf67
JB		 1973}
1974
49461622 1975static ieee80211_rx_result debug_noinline
24a8fdad 1976ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 1977{
1978 struct ieee80211_local *local = rx->local;
1979 struct ieee80211_hw *hw = &local->hw;
1980 struct sk_buff *skb = rx->skb;
a7767f95 1981 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1982 struct tid_ampdu_rx *tid_agg_rx;
1983 u16 start_seq_num;
1984 u16 tid;
1985
a7767f95 1986 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1987 return RX_CONTINUE;
71364716 1988
a7767f95 1989 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 1990 struct {
1991 __le16 control, start_seq_num;
1992 } __packed bar_data;
1993
71364716 1994 if (!rx->sta)
a02ae758 1995 return RX_DROP_MONITOR;
8ae5977f
JB		 1996
1997 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1998 &bar_data, sizeof(bar_data)))
1999 return RX_DROP_MONITOR;
2000
8ae5977f 2001 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2002
2003 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2004 if (!tid_agg_rx)
a02ae758 2005 return RX_DROP_MONITOR;
71364716 2006
8ae5977f 2007 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2008
2009 /* reset session timer */
20ad19d0
JB		 2010 if (tid_agg_rx->timeout)
2011 mod_timer(&tid_agg_rx->session_timer,
2012 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2013
dd318575 2014 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2015 /* release stored frames up to start of BAR */
24a8fdad 2016 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2017 spin_unlock(&tid_agg_rx->reorder_lock);
2018
a02ae758
JB		 2019 kfree_skb(skb);
2020 return RX_QUEUED;
71364716
RR		 2021 }
2022
08daecae
JB		 2023 /*
2024 * After this point, we only want management frames,
2025 * so we can drop all remaining control frames to
2026 * cooked monitor interfaces.
2027 */
2028 return RX_DROP_MONITOR;
71364716
RR		 2029}
2030
f4f727a6
JM		 2031static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2032 struct ieee80211_mgmt *mgmt,
2033 size_t len)
fea14732
JM		 2034{
2035 struct ieee80211_local *local = sdata->local;
2036 struct sk_buff *skb;
2037 struct ieee80211_mgmt *resp;
2038
47846c9b 2039 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2040 /* Not to own unicast address */
2041 return;
2042 }
2043
46900298
JB		 2044 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2045 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2046 /* Not from the current AP or not associated yet. */
fea14732
JM		 2047 return;
2048 }
2049
2050 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2051 /* Too short SA Query request frame */
2052 return;
2053 }
2054
2055 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2056 if (skb == NULL)
2057 return;
2058
2059 skb_reserve(skb, local->hw.extra_tx_headroom);
2060 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2061 memset(resp, 0, 24);
2062 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2063 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2064 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2065 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2066 IEEE80211_STYPE_ACTION);
2067 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2068 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2069 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2070 memcpy(resp->u.action.u.sa_query.trans_id,
2071 mgmt->u.action.u.sa_query.trans_id,
2072 WLAN_SA_QUERY_TR_ID_LEN);
2073
62ae67be 2074 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2075}
2076
2e161f78
JB		 2077static ieee80211_rx_result debug_noinline
2078ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2079{
2080 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2081 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2082
2083 /*
2084 * From here on, look only at management frames.
2085 * Data and control frames are already handled,
2086 * and unknown (reserved) frames are useless.
2087 */
2088 if (rx->skb->len < 24)
2089 return RX_DROP_MONITOR;
2090
2091 if (!ieee80211_is_mgmt(mgmt->frame_control))
2092 return RX_DROP_MONITOR;
2093
554891e6 2094 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2095 return RX_DROP_MONITOR;
2096
2097 if (ieee80211_drop_unencrypted_mgmt(rx))
2098 return RX_DROP_UNUSABLE;
2099
2100 return RX_CONTINUE;
2101}
2102
de1ede7a
JB		 2103static ieee80211_rx_result debug_noinline
2104ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2105{
2106 struct ieee80211_local *local = rx->local;
eb9fb5b8 2107 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2108 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2109 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2110 int len = rx->skb->len;
2111
2112 if (!ieee80211_is_action(mgmt->frame_control))
2113 return RX_CONTINUE;
2114
026331c4
JM		 2115 /* drop too small frames */
2116 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2117 return RX_DROP_UNUSABLE;
de1ede7a 2118
026331c4 2119 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2120 return RX_DROP_UNUSABLE;
de1ede7a 2121
554891e6 2122 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2123 return RX_DROP_UNUSABLE;
97ebe12a 2124
de1ede7a
JB		 2125 switch (mgmt->u.action.category) {
2126 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 2127 /*
2128 * The aggregation code is not prepared to handle
2129 * anything but STA/AP due to the BSSID handling;
2130 * IBSS could work in the code but isn't supported
2131 * by drivers or the standard.
2132 */
2133 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2134 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2135 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2136 break;
8abd3f9b 2137
026331c4
JM		 2138 /* verify action_code is present */
2139 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2140 break;
2141
de1ede7a
JB		 2142 switch (mgmt->u.action.u.addba_req.action_code) {
2143 case WLAN_ACTION_ADDBA_REQ:
2144 if (len < (IEEE80211_MIN_ACTION_SIZE +
2145 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2146 goto invalid;
2147 break;
de1ede7a
JB		 2148 case WLAN_ACTION_ADDBA_RESP:
2149 if (len < (IEEE80211_MIN_ACTION_SIZE +
2150 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2151 goto invalid;
2152 break;
de1ede7a
JB		 2153 case WLAN_ACTION_DELBA:
2154 if (len < (IEEE80211_MIN_ACTION_SIZE +
2155 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2156 goto invalid;
2157 break;
2158 default:
2159 goto invalid;
de1ede7a 2160 }
bed7ee6e 2161
8b58ff83 2162 goto queue;
39192c0b
JB		 2163 case WLAN_CATEGORY_SPECTRUM_MGMT:
2164 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2165 break;
46900298
JB		 2166
2167 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2168 break;
46900298 2169
026331c4
JM		 2170 /* verify action_code is present */
2171 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2172 break;
2173
39192c0b
JB		 2174 switch (mgmt->u.action.u.measurement.action_code) {
2175 case WLAN_ACTION_SPCT_MSR_REQ:
2176 if (len < (IEEE80211_MIN_ACTION_SIZE +
2177 sizeof(mgmt->u.action.u.measurement)))
84040805 2178 break;
39192c0b 2179 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2180 goto handled;
c481ec97
S		 2181 case WLAN_ACTION_SPCT_CHL_SWITCH:
2182 if (len < (IEEE80211_MIN_ACTION_SIZE +
2183 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2184 break;
c481ec97 2185
cc32abd4 2186 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2187 break;
cc32abd4 2188
46900298 2189 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2190 break;
c481ec97 2191
8b58ff83 2192 goto queue;
39192c0b
JB		 2193 }
2194 break;
fea14732
JM		 2195 case WLAN_CATEGORY_SA_QUERY:
2196 if (len < (IEEE80211_MIN_ACTION_SIZE +
2197 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2198 break;
2199
fea14732
JM		 2200 switch (mgmt->u.action.u.sa_query.action) {
2201 case WLAN_ACTION_SA_QUERY_REQUEST:
2202 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2203 break;
fea14732 2204 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2205 goto handled;
fea14732
JM		 2206 }
2207 break;
97ad9139 2208 case WLAN_CATEGORY_MESH_PLINK:
77a121c3
JB		 2209 if (!ieee80211_vif_is_mesh(&sdata->vif))
2210 break;
8b58ff83 2211 goto queue;
c7108a71
JC		 2212 case WLAN_CATEGORY_MESH_PATH_SEL:
2213 if (!mesh_path_sel_is_hwmp(sdata))
2214 break;
2215 goto queue;
84040805 2216 }
026331c4 2217
2e161f78
JB		 2218 return RX_CONTINUE;
2219
bed7ee6e 2220 invalid:
554891e6 2221 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2222 /* will return in the next handlers */
2223 return RX_CONTINUE;
2224
2225 handled:
2226 if (rx->sta)
2227 rx->sta->rx_packets++;
2228 dev_kfree_skb(rx->skb);
2229 return RX_QUEUED;
2230
2231 queue:
2232 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2233 skb_queue_tail(&sdata->skb_queue, rx->skb);
2234 ieee80211_queue_work(&local->hw, &sdata->work);
2235 if (rx->sta)
2236 rx->sta->rx_packets++;
2237 return RX_QUEUED;
2238}
2239
2240static ieee80211_rx_result debug_noinline
2241ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2242{
554891e6 2243 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2244
2245 /* skip known-bad action frames and return them in the next handler */
554891e6 2246 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2247 return RX_CONTINUE;
d7907448 2248
026331c4
JM		 2249 /*
2250 * Getting here means the kernel doesn't know how to handle
2251 * it, but maybe userspace does ... include returned frames
2252 * so userspace can register for those to know whether ones
2253 * it transmitted were processed or returned.
2254 */
026331c4 2255
2e161f78
JB		 2256 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2257 rx->skb->data, rx->skb->len,
2258 GFP_ATOMIC)) {
2259 if (rx->sta)
2260 rx->sta->rx_packets++;
2261 dev_kfree_skb(rx->skb);
2262 return RX_QUEUED;
2263 }
2264
2265
2266 return RX_CONTINUE;
2267}
2268
2269static ieee80211_rx_result debug_noinline
2270ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2271{
2272 struct ieee80211_local *local = rx->local;
2273 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2274 struct sk_buff *nskb;
2275 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2276 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2277
2278 if (!ieee80211_is_action(mgmt->frame_control))
2279 return RX_CONTINUE;
2280
2281 /*
2282 * For AP mode, hostapd is responsible for handling any action
2283 * frames that we didn't handle, including returning unknown
2284 * ones. For all other modes we will return them to the sender,
2285 * setting the 0x80 bit in the action category, as required by
2286 * 802.11-2007 7.3.1.11.
2287 * Newer versions of hostapd shall also use the management frame
2288 * registration mechanisms, but older ones still use cooked
2289 * monitor interfaces so push all frames there.
2290 */
554891e6 2291 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2292 (sdata->vif.type == NL80211_IFTYPE_AP ||
2293 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2294 return RX_DROP_MONITOR;
026331c4 2295
84040805
JB		 2296 /* do not return rejected action frames */
2297 if (mgmt->u.action.category & 0x80)
2298 return RX_DROP_UNUSABLE;
2299
2300 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2301 GFP_ATOMIC);
2302 if (nskb) {
292b4df6 2303 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2304
292b4df6
JL		 2305 nmgmt->u.action.category |= 0x80;
2306 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2307 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2308
2309 memset(nskb->cb, 0, sizeof(nskb->cb));
2310
2311 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2312 }
39192c0b
JB		 2313 dev_kfree_skb(rx->skb);
2314 return RX_QUEUED;
de1ede7a
JB		 2315}
2316
49461622 2317static ieee80211_rx_result debug_noinline
5cf121c3 2318ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2319{
eb9fb5b8 2320 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2321 ieee80211_rx_result rxs;
77a121c3
JB		 2322 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2323 __le16 stype;
571ecf67 2324
af6b6374
JB		 2325 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2326 if (rxs != RX_CONTINUE)
2327 return rxs;
2328
77a121c3 2329 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2330
77a121c3
JB		 2331 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2332 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2333 sdata->vif.type != NL80211_IFTYPE_STATION)
2334 return RX_DROP_MONITOR;
472dbc45 2335
77a121c3
JB		 2336 switch (stype) {
2337 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2338 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2339 /* process for all: mesh, mlme, ibss */
2340 break;
2341 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2342 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2343 if (is_multicast_ether_addr(mgmt->da) &&
2344 !is_broadcast_ether_addr(mgmt->da))
2345 return RX_DROP_MONITOR;
2346
77a121c3
JB		 2347 /* process only for station */
2348 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2349 return RX_DROP_MONITOR;
2350 break;
2351 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2352 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2353 /* process only for ibss */
2354 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2355 return RX_DROP_MONITOR;
2356 break;
2357 default:
2358 return RX_DROP_MONITOR;
2359 }
f9d540ee 2360
77a121c3 2361 /* queue up frame and kick off work to process it */
c1475ca9 2362 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2363 skb_queue_tail(&sdata->skb_queue, rx->skb);
2364 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2365 if (rx->sta)
2366 rx->sta->rx_packets++;
46900298 2367
77a121c3 2368 return RX_QUEUED;
571ecf67
JB		 2369}
2370
5cf121c3 2371/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2372static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2373 struct ieee80211_rate *rate)
3d30d949
MW		 2374{
2375 struct ieee80211_sub_if_data *sdata;
2376 struct ieee80211_local *local = rx->local;
2377 struct ieee80211_rtap_hdr {
2378 struct ieee80211_radiotap_header hdr;
2379 u8 flags;
5f0b7de5 2380 u8 rate_or_pad;
3d30d949
MW		 2381 __le16 chan_freq;
2382 __le16 chan_flags;
bc10502d 2383 } __packed *rthdr;
3d30d949
MW		 2384 struct sk_buff *skb = rx->skb, *skb2;
2385 struct net_device *prev_dev = NULL;
eb9fb5b8 2386 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2387
554891e6
JB		 2388 /*
2389 * If cooked monitor has been processed already, then
2390 * don't do it again. If not, set the flag.
2391 */
2392 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2393 goto out_free_skb;
554891e6 2394 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2395
3d30d949
MW		 2396 if (skb_headroom(skb) < sizeof(*rthdr) &&
2397 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2398 goto out_free_skb;
2399
2400 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2401 memset(rthdr, 0, sizeof(*rthdr));
2402 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2403 rthdr->hdr.it_present =
2404 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2405 (1 << IEEE80211_RADIOTAP_CHANNEL));
2406
5f0b7de5
JB		 2407 if (rate) {
2408 rthdr->rate_or_pad = rate->bitrate / 5;
2409 rthdr->hdr.it_present |=
2410 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2411 }
3d30d949
MW		 2412 rthdr->chan_freq = cpu_to_le16(status->freq);
2413
2414 if (status->band == IEEE80211_BAND_5GHZ)
2415 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2416 IEEE80211_CHAN_5GHZ);
2417 else
2418 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2419 IEEE80211_CHAN_2GHZ);
2420
2421 skb_set_mac_header(skb, 0);
2422 skb->ip_summed = CHECKSUM_UNNECESSARY;
2423 skb->pkt_type = PACKET_OTHERHOST;
2424 skb->protocol = htons(ETH_P_802_2);
2425
2426 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2427 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2428 continue;
2429
05c914fe 2430 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2431 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2432 continue;
2433
2434 if (prev_dev) {
2435 skb2 = skb_clone(skb, GFP_ATOMIC);
2436 if (skb2) {
2437 skb2->dev = prev_dev;
5548a8a1 2438 netif_receive_skb(skb2);
3d30d949
MW		 2439 }
2440 }
2441
2442 prev_dev = sdata->dev;
2443 sdata->dev->stats.rx_packets++;
2444 sdata->dev->stats.rx_bytes += skb->len;
2445 }
2446
2447 if (prev_dev) {
2448 skb->dev = prev_dev;
5548a8a1 2449 netif_receive_skb(skb);
554891e6
JB		 2450 return;
2451 }
3d30d949
MW		 2452
2453 out_free_skb:
2454 dev_kfree_skb(skb);
2455}
2456
aa0c8636
CL		 2457static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2458 ieee80211_rx_result res)
2459{
2460 switch (res) {
2461 case RX_DROP_MONITOR:
2462 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2463 if (rx->sta)
2464 rx->sta->rx_dropped++;
2465 /* fall through */
2466 case RX_CONTINUE: {
2467 struct ieee80211_rate *rate = NULL;
2468 struct ieee80211_supported_band *sband;
2469 struct ieee80211_rx_status *status;
2470
2471 status = IEEE80211_SKB_RXCB((rx->skb));
2472
2473 sband = rx->local->hw.wiphy->bands[status->band];
2474 if (!(status->flag & RX_FLAG_HT))
2475 rate = &sband->bitrates[status->rate_idx];
2476
2477 ieee80211_rx_cooked_monitor(rx, rate);
2478 break;
2479 }
2480 case RX_DROP_UNUSABLE:
2481 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2482 if (rx->sta)
2483 rx->sta->rx_dropped++;
2484 dev_kfree_skb(rx->skb);
2485 break;
2486 case RX_QUEUED:
2487 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2488 break;
2489 }
2490}
571ecf67 2491
24a8fdad 2492static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2493{
58905290 2494 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2495 struct sk_buff *skb;
8944b79f 2496
e32f85f7
LCC		 2497#define CALL_RXH(rxh) \
2498 do { \
2499 res = rxh(rx); \
2500 if (res != RX_CONTINUE) \
2569a826 2501 goto rxh_next; \
e32f85f7 2502 } while (0);
49461622 2503
24a8fdad
CL		 2504 spin_lock(&rx->local->rx_skb_queue.lock);
2505 if (rx->local->running_rx_handler)
2506 goto unlock;
2507
2508 rx->local->running_rx_handler = true;
2509
2510 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2511 spin_unlock(&rx->local->rx_skb_queue.lock);
2512
2569a826
JB		 2513 /*
2514 * all the other fields are valid across frames
2515 * that belong to an aMPDU since they are on the
2516 * same TID from the same station
2517 */
2518 rx->skb = skb;
2519
2520 CALL_RXH(ieee80211_rx_h_decrypt)
2521 CALL_RXH(ieee80211_rx_h_check_more_data)
2522 CALL_RXH(ieee80211_rx_h_sta_process)
2523 CALL_RXH(ieee80211_rx_h_defragment)
2524 CALL_RXH(ieee80211_rx_h_ps_poll)
2525 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2526 /* must be after MMIC verify so header is counted in MPDU mic */
2527 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2528 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 2529#ifdef CONFIG_MAC80211_MESH
aa0c8636 2530 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2531 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2532#endif
2569a826 2533 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2534 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2535 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2536 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2537 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2538 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2539 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2540
aa0c8636
CL		 2541 rxh_next:
2542 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2543 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2544#undef CALL_RXH
aa0c8636 2545 }
24a8fdad
CL		 2546
2547 rx->local->running_rx_handler = false;
2548
2549 unlock:
2550 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2551}
2552
4406c376 2553static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2554{
aa0c8636
CL		 2555 ieee80211_rx_result res = RX_DROP_MONITOR;
2556
aa0c8636
CL		 2557#define CALL_RXH(rxh) \
2558 do { \
2559 res = rxh(rx); \
2560 if (res != RX_CONTINUE) \
2561 goto rxh_next; \
2562 } while (0);
2563
2564 CALL_RXH(ieee80211_rx_h_passive_scan)
2565 CALL_RXH(ieee80211_rx_h_check)
2566
24a8fdad 2567 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2568
24a8fdad 2569 ieee80211_rx_handlers(rx);
aa0c8636 2570 return;
49461622 2571
2569a826 2572 rxh_next:
aa0c8636
CL		 2573 ieee80211_rx_handlers_result(rx, res);
2574
2575#undef CALL_RXH
58905290
JB		 2576}
2577
2bff8ebf 2578/*
dd318575
JB		 2579 * This function makes calls into the RX path, therefore
2580 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2581 */
2582void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2583{
554891e6
JB		 2584 struct ieee80211_rx_data rx = {
2585 .sta = sta,
2586 .sdata = sta->sdata,
2587 .local = sta->local,
2588 .queue = tid,
fcf8bd3b 2589 .flags = 0,
554891e6 2590 };
2c15a0cf
CL		 2591 struct tid_ampdu_rx *tid_agg_rx;
2592
2593 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2594 if (!tid_agg_rx)
2595 return;
2bff8ebf 2596
2c15a0cf 2597 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2598 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2599 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2600
24a8fdad 2601 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2602}
2603
571ecf67
JB		 2604/* main receive path */
2605
20b01f80 2606static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2607 struct ieee80211_hdr *hdr)
2608{
20b01f80 2609 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2610 struct sk_buff *skb = rx->skb;
2611 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2612 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2613 int multicast = is_multicast_ether_addr(hdr->addr1);
2614
51fb61e7 2615 switch (sdata->vif.type) {
05c914fe 2616 case NL80211_IFTYPE_STATION:
9bc383de 2617 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2618 return 0;
77fdaa12 2619 if (!multicast &&
47846c9b 2620 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2621 if (!(sdata->dev->flags & IFF_PROMISC) ||
2622 sdata->u.mgd.use_4addr)
23a24def 2623 return 0;
554891e6 2624 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2625 }
2626 break;
05c914fe 2627 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2628 if (!bssid)
2629 return 0;
a7767f95 2630 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2631 return 1;
87291c02 2632 }
46900298 2633 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2634 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2635 return 0;
554891e6 2636 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2637 } else if (!multicast &&
47846c9b 2638 compare_ether_addr(sdata->vif.addr,
23a24def 2639 hdr->addr1) != 0) {
4150c572 2640 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2641 return 0;
554891e6 2642 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2643 } else if (!rx->sta) {
2644 int rate_idx;
eb9fb5b8 2645 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2646 rate_idx = 0; /* TODO: HT rates */
2647 else
eb9fb5b8 2648 rate_idx = status->rate_idx;
34e89507
JB		 2649 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2650 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2651 }
23a24def 2652 break;
05c914fe 2653 case NL80211_IFTYPE_MESH_POINT:
6032f934 2654 if (!multicast &&
47846c9b 2655 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2656 hdr->addr1) != 0) {
2657 if (!(sdata->dev->flags & IFF_PROMISC))
2658 return 0;
2659
554891e6 2660 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2661 }
2662 break;
05c914fe
JB		 2663 case NL80211_IFTYPE_AP_VLAN:
2664 case NL80211_IFTYPE_AP:
23a24def 2665 if (!bssid) {
47846c9b 2666 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2667 hdr->addr1))
2668 return 0;
2669 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2670 sdata->vif.addr)) {
771bbd09
AN		 2671 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2672 !ieee80211_is_beacon(hdr->frame_control))
23a24def 2673 return 0;
554891e6 2674 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2675 }
23a24def 2676 break;
05c914fe 2677 case NL80211_IFTYPE_WDS:
a7767f95 2678 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2679 return 0;
2680 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2681 return 0;
2682 break;
2ca27bcf 2683 default:
fb1c1cd6
JB		 2684 /* should never get here */
2685 WARN_ON(1);
2686 break;
23a24def
JB		 2687 }
2688
2689 return 1;
2690}
2691
4406c376
JB		 2692/*
2693 * This function returns whether or not the SKB
2694 * was destined for RX processing or not, which,
2695 * if consume is true, is equivalent to whether
2696 * or not the skb was consumed.
2697 */
2698static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2699 struct sk_buff *skb, bool consume)
2700{
2701 struct ieee80211_local *local = rx->local;
2702 struct ieee80211_sub_if_data *sdata = rx->sdata;
2703 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2704 struct ieee80211_hdr *hdr = (void *)skb->data;
2705 int prepares;
2706
2707 rx->skb = skb;
554891e6 2708 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2709 prepares = prepare_for_handlers(rx, hdr);
2710
2711 if (!prepares)
2712 return false;
2713
4406c376
JB		 2714 if (!consume) {
2715 skb = skb_copy(skb, GFP_ATOMIC);
2716 if (!skb) {
2717 if (net_ratelimit())
2718 wiphy_debug(local->hw.wiphy,
b305dae4 2719 "failed to copy skb for %s\n",
4406c376
JB		 2720 sdata->name);
2721 return true;
2722 }
2723
2724 rx->skb = skb;
2725 }
2726
2727 ieee80211_invoke_rx_handlers(rx);
2728 return true;
2729}
2730
571ecf67 2731/*
6368e4b1
RR		 2732 * This is the actual Rx frames handler. as it blongs to Rx path it must
2733 * be called with rcu_read_lock protection.
571ecf67 2734 */
71ebb4aa 2735static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2736 struct sk_buff *skb)
571ecf67 2737{
554891e6 2738 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2739 struct ieee80211_local *local = hw_to_local(hw);
2740 struct ieee80211_sub_if_data *sdata;
571ecf67 2741 struct ieee80211_hdr *hdr;
e3cf8b3f 2742 __le16 fc;
5cf121c3 2743 struct ieee80211_rx_data rx;
4406c376 2744 struct ieee80211_sub_if_data *prev;
56af3268 2745 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2746 int err = 0;
571ecf67 2747
e3cf8b3f 2748 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2749 memset(&rx, 0, sizeof(rx));
2750 rx.skb = skb;
2751 rx.local = local;
72abd81b 2752
e3cf8b3f 2753 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2754 local->dot11ReceivedFragmentCount++;
571ecf67 2755
142b9f50 2756 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
b23b025f 2757 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2758 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2759
e3cf8b3f
ZY		 2760 if (ieee80211_is_mgmt(fc))
2761 err = skb_linearize(skb);
2762 else
2763 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2764
2765 if (err) {
2766 dev_kfree_skb(skb);
2767 return;
2768 }
2769
2770 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2771 ieee80211_parse_qos(&rx);
d1c3a37c 2772 ieee80211_verify_alignment(&rx);
38f3714d 2773
e3cf8b3f 2774 if (ieee80211_is_data(fc)) {
56af3268 2775 prev_sta = NULL;
4406c376 2776
abe60632 2777 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2778 if (!prev_sta) {
2779 prev_sta = sta;
2780 continue;
2781 }
2782
2783 rx.sta = prev_sta;
2784 rx.sdata = prev_sta->sdata;
4406c376 2785 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2786
56af3268 2787 prev_sta = sta;
4406c376 2788 }
56af3268
BG		 2789
2790 if (prev_sta) {
2791 rx.sta = prev_sta;
2792 rx.sdata = prev_sta->sdata;
2793
4406c376 2794 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2795 return;
8e26d5ad 2796 goto out;
56af3268 2797 }
4406c376
JB		 2798 }
2799
4b0dd98e 2800 prev = NULL;
b2e7771e 2801
4b0dd98e
JB		 2802 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2803 if (!ieee80211_sdata_running(sdata))
2804 continue;
340e11f3 2805
4b0dd98e
JB		 2806 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2807 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2808 continue;
340e11f3 2809
4b0dd98e
JB		 2810 /*
2811 * frame is destined for this interface, but if it's
2812 * not also for the previous one we handle that after
2813 * the loop to avoid copying the SKB once too much
2814 */
4bb29f8c 2815
4b0dd98e 2816 if (!prev) {
abe60632 2817 prev = sdata;
4b0dd98e 2818 continue;
340e11f3 2819 }
4bb29f8c 2820
4b0dd98e
JB		 2821 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2822 rx.sdata = prev;
2823 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2824
4b0dd98e
JB		 2825 prev = sdata;
2826 }
2827
2828 if (prev) {
2829 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2830 rx.sdata = prev;
4406c376 2831
4b0dd98e
JB		 2832 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2833 return;
571ecf67 2834 }
4406c376 2835
8e26d5ad 2836 out:
4406c376 2837 dev_kfree_skb(skb);
571ecf67 2838}
6368e4b1
RR		 2839
2840/*
2841 * This is the receive path handler. It is called by a low level driver when an
2842 * 802.11 MPDU is received from the hardware.
2843 */
103bf9f7 2844void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2845{
2846 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2847 struct ieee80211_rate *rate = NULL;
2848 struct ieee80211_supported_band *sband;
f1d58c25 2849 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2850
d20ef63d
JB		 2851 WARN_ON_ONCE(softirq_count() == 0);
2852
77a980dc
JB		 2853 if (WARN_ON(status->band < 0 ||
2854 status->band >= IEEE80211_NUM_BANDS))
2855 goto drop;
8318d78a
JB		 2856
2857 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2858 if (WARN_ON(!sband))
2859 goto drop;
8318d78a 2860
89c3a8ac
JB		 2861 /*
2862 * If we're suspending, it is possible although not too likely
2863 * that we'd be receiving frames after having already partially
2864 * quiesced the stack. We can't process such frames then since
2865 * that might, for example, cause stations to be added or other
2866 * driver callbacks be invoked.
2867 */
77a980dc
JB		 2868 if (unlikely(local->quiescing || local->suspended))
2869 goto drop;
89c3a8ac 2870
ea77f12f
JB		 2871 /*
2872 * The same happens when we're not even started,
2873 * but that's worth a warning.
2874 */
77a980dc
JB		 2875 if (WARN_ON(!local->started))
2876 goto drop;
ea77f12f 2877
fc885189 2878 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2879 /*
fc885189
JB		 2880 * Validate the rate, unless a PLCP error means that
2881 * we probably can't have a valid rate here anyway.
e5d6eb83 2882 */
fc885189
JB		 2883
2884 if (status->flag & RX_FLAG_HT) {
2885 /*
2886 * rate_idx is MCS index, which can be [0-76]
2887 * as documented on:
2888 *
2889 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2890 *
2891 * Anything else would be some sort of driver or
2892 * hardware error. The driver should catch hardware
2893 * errors.
2894 */
2895 if (WARN((status->rate_idx < 0 ||
2896 status->rate_idx > 76),
2897 "Rate marked as an HT rate but passed "
2898 "status->rate_idx is not "
2899 "an MCS index [0-76]: %d (0x%02x)\n",
2900 status->rate_idx,
2901 status->rate_idx))
2902 goto drop;
2903 } else {
2904 if (WARN_ON(status->rate_idx < 0 ||
2905 status->rate_idx >= sband->n_bitrates))
2906 goto drop;
2907 rate = &sband->bitrates[status->rate_idx];
2908 }
0fb8ca45 2909 }
6368e4b1 2910
554891e6
JB		 2911 status->rx_flags = 0;
2912
6368e4b1
RR		 2913 /*
2914 * key references and virtual interfaces are protected using RCU
2915 * and this requires that we are in a read-side RCU section during
2916 * receive processing
2917 */
2918 rcu_read_lock();
2919
2920 /*
2921 * Frames with failed FCS/PLCP checksum are not returned,
2922 * all other frames are returned without radiotap header
2923 * if it was previously present.
2924 * Also, frames with less than 16 bytes are dropped.
2925 */
f1d58c25 2926 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2927 if (!skb) {
2928 rcu_read_unlock();
2929 return;
2930 }
2931
e1e54068
JB		 2932 ieee80211_tpt_led_trig_rx(local,
2933 ((struct ieee80211_hdr *)skb->data)->frame_control,
2934 skb->len);
071d9ac2 2935 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 2936
2937 rcu_read_unlock();
77a980dc
JB		 2938
2939 return;
2940 drop:
2941 kfree_skb(skb);
6368e4b1 2942}
103bf9f7 2943EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 2944
2945/* This is a version of the rx handler that can be called from hard irq
2946 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2947void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2948{
2949 struct ieee80211_local *local = hw_to_local(hw);
2950
2951 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2952
571ecf67
JB		 2953 skb->pkt_type = IEEE80211_RX_MSG;
2954 skb_queue_tail(&local->skb_queue, skb);
2955 tasklet_schedule(&local->tasklet);
2956}
2957EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)