projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
nl80211: add a parameter for using 4-address frames on virtual 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>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
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>
571ecf67
JB		 13#include <linux/kernel.h>
14#include <linux/skbuff.h>
15#include <linux/netdevice.h>
16#include <linux/etherdevice.h>
d4e46a3d 17#include <linux/rcupdate.h>
571ecf67
JB		 18#include <net/mac80211.h>
19#include <net/ieee80211_radiotap.h>
20
21#include "ieee80211_i.h"
24487981 22#include "driver-ops.h"
2c8dccc7 23#include "led.h"
33b64eb2 24#include "mesh.h"
571ecf67
JB		 25#include "wep.h"
26#include "wpa.h"
27#include "tkip.h"
28#include "wme.h"
29
c6a1fa12
JB		 30static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
31 struct tid_ampdu_rx *tid_agg_rx,
32 struct sk_buff *skb,
33 u16 mpdu_seq_num,
34 int bar_req);
b2e7771e
JB		 35/*
36 * monitor mode reception
37 *
38 * This function cleans up the SKB, i.e. it removes all the stuff
39 * only useful for monitoring.
40 */
41static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 42 struct sk_buff *skb)
b2e7771e 43{
b2e7771e
JB		 44 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
45 if (likely(skb->len > FCS_LEN))
46 skb_trim(skb, skb->len - FCS_LEN);
47 else {
48 /* driver bug */
49 WARN_ON(1);
50 dev_kfree_skb(skb);
51 skb = NULL;
52 }
53 }
54
55 return skb;
56}
57
f1d58c25 58static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 59 int present_fcs_len)
b2e7771e 60{
f1d58c25 61 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 62 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 63
64 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
65 return 1;
0869aea0 66 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 67 return 1;
87228f57
HH		 68 if (ieee80211_is_ctl(hdr->frame_control) &&
69 !ieee80211_is_pspoll(hdr->frame_control) &&
70 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 71 return 1;
72 return 0;
73}
74
601ae7f2
BR		 75static int
76ieee80211_rx_radiotap_len(struct ieee80211_local *local,
77 struct ieee80211_rx_status *status)
78{
79 int len;
80
81 /* always present fields */
82 len = sizeof(struct ieee80211_radiotap_header) + 9;
83
84 if (status->flag & RX_FLAG_TSFT)
85 len += 8;
7fee5372 86 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2
BR		 87 len += 1;
88 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
89 len += 1;
90
91 if (len & 1) /* padding for RX_FLAGS if necessary */
92 len++;
93
601ae7f2
BR		 94 return len;
95}
96
d1c3a37c 97/*
601ae7f2
BR		 98 * ieee80211_add_rx_radiotap_header - add radiotap header
99 *
100 * add a radiotap header containing all the fields which the hardware provided.
101 */
102static void
103ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
104 struct sk_buff *skb,
601ae7f2
BR		 105 struct ieee80211_rate *rate,
106 int rtap_len)
107{
f1d58c25 108 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 109 struct ieee80211_radiotap_header *rthdr;
110 unsigned char *pos;
6a86b9c7 111 u16 rx_flags = 0;
601ae7f2
BR		 112
113 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
114 memset(rthdr, 0, rtap_len);
115
116 /* radiotap header, set always present flags */
117 rthdr->it_present =
118 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 119 (1 << IEEE80211_RADIOTAP_CHANNEL) |
120 (1 << IEEE80211_RADIOTAP_ANTENNA) |
121 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
122 rthdr->it_len = cpu_to_le16(rtap_len);
123
124 pos = (unsigned char *)(rthdr+1);
125
126 /* the order of the following fields is important */
127
128 /* IEEE80211_RADIOTAP_TSFT */
129 if (status->flag & RX_FLAG_TSFT) {
6a86b9c7 130 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 131 rthdr->it_present |=
132 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
133 pos += 8;
134 }
135
136 /* IEEE80211_RADIOTAP_FLAGS */
137 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
138 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 139 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
140 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 141 if (status->flag & RX_FLAG_SHORTPRE)
142 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 143 pos++;
144
145 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 146 if (status->flag & RX_FLAG_HT) {
147 /*
148 * TODO: add following information into radiotap header once
149 * suitable fields are defined for it:
150 * - MCS index (status->rate_idx)
151 * - HT40 (status->flag & RX_FLAG_40MHZ)
152 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
153 */
154 *pos = 0;
8d6f658e 155 } else {
ebe6c7ba 156 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 157 *pos = rate->bitrate / 5;
8d6f658e 158 }
601ae7f2
BR		 159 pos++;
160
161 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 162 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 163 pos += 2;
164 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 165 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
166 pos);
9deb1ae5 167 else if (rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 168 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
169 pos);
601ae7f2 170 else
6a86b9c7
JB		 171 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
172 pos);
601ae7f2
BR		 173 pos += 2;
174
175 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
176 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
177 *pos = status->signal;
178 rthdr->it_present |=
179 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
180 pos++;
181 }
182
183 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
184 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
185 *pos = status->noise;
186 rthdr->it_present |=
187 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
188 pos++;
189 }
190
191 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
192
193 /* IEEE80211_RADIOTAP_ANTENNA */
194 *pos = status->antenna;
195 pos++;
196
601ae7f2
BR		 197 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
198
199 /* IEEE80211_RADIOTAP_RX_FLAGS */
200 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 201 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 202 pos++;
aae89831 203 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 204 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
205 put_unaligned_le16(rx_flags, pos);
601ae7f2
BR		 206 pos += 2;
207}
208
b2e7771e
JB		 209/*
210 * This function copies a received frame to all monitor interfaces and
211 * returns a cleaned-up SKB that no longer includes the FCS nor the
212 * radiotap header the driver might have added.
213 */
214static struct sk_buff *
215ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 216 struct ieee80211_rate *rate)
b2e7771e 217{
f1d58c25 218 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 219 struct ieee80211_sub_if_data *sdata;
b2e7771e 220 int needed_headroom = 0;
b2e7771e
JB		 221 struct sk_buff *skb, *skb2;
222 struct net_device *prev_dev = NULL;
223 int present_fcs_len = 0;
b2e7771e
JB		 224
225 /*
226 * First, we may need to make a copy of the skb because
227 * (1) we need to modify it for radiotap (if not present), and
228 * (2) the other RX handlers will modify the skb we got.
229 *
230 * We don't need to, of course, if we aren't going to return
231 * the SKB because it has a bad FCS/PLCP checksum.
232 */
0869aea0
JB		 233
234 /* room for the radiotap header based on driver features */
235 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 236
237 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
238 present_fcs_len = FCS_LEN;
239
240 if (!local->monitors) {
0869aea0 241 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 242 dev_kfree_skb(origskb);
243 return NULL;
244 }
245
0869aea0 246 return remove_monitor_info(local, origskb);
b2e7771e
JB		 247 }
248
0869aea0 249 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 250 /* only need to expand headroom if necessary */
251 skb = origskb;
252 origskb = NULL;
253
254 /*
255 * This shouldn't trigger often because most devices have an
256 * RX header they pull before we get here, and that should
257 * be big enough for our radiotap information. We should
258 * probably export the length to drivers so that we can have
259 * them allocate enough headroom to start with.
260 */
261 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 262 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 263 dev_kfree_skb(skb);
264 return NULL;
265 }
266 } else {
267 /*
268 * Need to make a copy and possibly remove radiotap header
269 * and FCS from the original.
270 */
271 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
272
0869aea0 273 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 274
275 if (!skb)
276 return origskb;
277 }
278
0869aea0
JB		 279 /* prepend radiotap information */
280 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 281
ce3edf6d 282 skb_reset_mac_header(skb);
b2e7771e
JB		 283 skb->ip_summed = CHECKSUM_UNNECESSARY;
284 skb->pkt_type = PACKET_OTHERHOST;
285 skb->protocol = htons(ETH_P_802_2);
286
287 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
288 if (!netif_running(sdata->dev))
289 continue;
290
05c914fe 291 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 292 continue;
293
3d30d949
MW		 294 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
295 continue;
296
b2e7771e
JB		 297 if (prev_dev) {
298 skb2 = skb_clone(skb, GFP_ATOMIC);
299 if (skb2) {
300 skb2->dev = prev_dev;
301 netif_rx(skb2);
302 }
303 }
304
305 prev_dev = sdata->dev;
306 sdata->dev->stats.rx_packets++;
307 sdata->dev->stats.rx_bytes += skb->len;
308 }
309
310 if (prev_dev) {
311 skb->dev = prev_dev;
312 netif_rx(skb);
313 } else
314 dev_kfree_skb(skb);
315
316 return origskb;
317}
318
319
5cf121c3 320static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 321{
238f74a2 322 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
6e0d114d
JB		 323 int tid;
324
325 /* does the frame have a qos control field? */
238f74a2
HH		 326 if (ieee80211_is_data_qos(hdr->frame_control)) {
327 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 328 /* frame has qos control */
238f74a2
HH		 329 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
330 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
5cf121c3 331 rx->flags |= IEEE80211_RX_AMSDU;
fd4c7f2f 332 else
5cf121c3 333 rx->flags &= ~IEEE80211_RX_AMSDU;
6e0d114d 334 } else {
1411f9b5
JB		 335 /*
336 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
337 *
338 * Sequence numbers for management frames, QoS data
339 * frames with a broadcast/multicast address in the
340 * Address 1 field, and all non-QoS data frames sent
341 * by QoS STAs are assigned using an additional single
342 * modulo-4096 counter, [...]
343 *
344 * We also use that counter for non-QoS STAs.
345 */
346 tid = NUM_RX_DATA_QUEUES - 1;
6e0d114d 347 }
52865dfd 348
5cf121c3 349 rx->queue = tid;
6e0d114d
JB		 350 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
351 * For now, set skb->priority to 0 for other cases. */
352 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 353}
6e0d114d 354
d1c3a37c
JB		 355/**
356 * DOC: Packet alignment
357 *
358 * Drivers always need to pass packets that are aligned to two-byte boundaries
359 * to the stack.
360 *
361 * Additionally, should, if possible, align the payload data in a way that
362 * guarantees that the contained IP header is aligned to a four-byte
363 * boundary. In the case of regular frames, this simply means aligning the
364 * payload to a four-byte boundary (because either the IP header is directly
365 * contained, or IV/RFC1042 headers that have a length divisible by four are
366 * in front of it).
367 *
368 * With A-MSDU frames, however, the payload data address must yield two modulo
369 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
370 * push the IP header further back to a multiple of four again. Thankfully, the
371 * specs were sane enough this time around to require padding each A-MSDU
372 * subframe to a length that is a multiple of four.
373 *
374 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
375 * the payload is not supported, the driver is required to move the 802.11
376 * header to be directly in front of the payload in that case.
377 */
378static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 379{
a7767f95 380 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
38f3714d
JB		 381 int hdrlen;
382
d1c3a37c
JB		 383#ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
384 return;
385#endif
386
387 if (WARN_ONCE((unsigned long)rx->skb->data & 1,
388 "unaligned packet at 0x%p\n", rx->skb->data))
389 return;
390
a7767f95 391 if (!ieee80211_is_data_present(hdr->frame_control))
38f3714d
JB		 392 return;
393
a7767f95 394 hdrlen = ieee80211_hdrlen(hdr->frame_control);
5cf121c3 395 if (rx->flags & IEEE80211_RX_AMSDU)
38f3714d 396 hdrlen += ETH_HLEN;
d1c3a37c
JB		 397 WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3,
398 "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen);
6e0d114d
JB		 399}
400
6368e4b1 401
571ecf67
JB		 402/* rx handlers */
403
49461622 404static ieee80211_rx_result debug_noinline
5cf121c3 405ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 406{
407 struct ieee80211_local *local = rx->local;
408 struct sk_buff *skb = rx->skb;
409
fbe9c429 410 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
f1d58c25 411 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 412
142b9f50
HS		 413 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) &&
414 (rx->flags & IEEE80211_RX_IN_SCAN))) {
ece8eddd 415 /* drop all the other packets during a software scan anyway */
f1d58c25 416 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
ece8eddd 417 dev_kfree_skb(skb);
9ae54c84 418 return RX_QUEUED;
571ecf67
JB		 419 }
420
5cf121c3 421 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
571ecf67
JB		 422 /* scanning finished during invoking of handlers */
423 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
e4c26add 424 return RX_DROP_UNUSABLE;
571ecf67
JB		 425 }
426
9ae54c84 427 return RX_CONTINUE;
571ecf67
JB		 428}
429
3cfcf6ac
JM		 430
431static int ieee80211_is_unicast_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
442static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
443{
444 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
445
446 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
447 return 0;
448
449 return ieee80211_is_robust_mgmt_frame(hdr);
450}
451
452
453/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
454static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
455{
456 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
457 struct ieee80211_mmie *mmie;
458
459 if (skb->len < 24 + sizeof(*mmie) ||
460 !is_multicast_ether_addr(hdr->da))
461 return -1;
462
463 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
464 return -1; /* not a robust management frame */
465
466 mmie = (struct ieee80211_mmie *)
467 (skb->data + skb->len - sizeof(*mmie));
468 if (mmie->element_id != WLAN_EID_MMIE ||
469 mmie->length != sizeof(*mmie) - 2)
470 return -1;
471
472 return le16_to_cpu(mmie->key_id);
473}
474
475
33b64eb2 476static ieee80211_rx_result
5cf121c3 477ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 478{
a7767f95
HH		 479 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
480 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
3c5772a5 481 char *dev_addr = rx->dev->dev_addr;
d6d1a5a7 482
a7767f95 483 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 484 if (is_multicast_ether_addr(hdr->addr1)) {
485 if (ieee80211_has_tods(hdr->frame_control) ||
486 !ieee80211_has_fromds(hdr->frame_control))
487 return RX_DROP_MONITOR;
488 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
489 return RX_DROP_MONITOR;
490 } else {
491 if (!ieee80211_has_a4(hdr->frame_control))
492 return RX_DROP_MONITOR;
493 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
494 return RX_DROP_MONITOR;
495 }
33b64eb2
LCC		 496 }
497
498 /* If there is not an established peer link and this is not a peer link
499 * establisment frame, beacon or probe, drop the frame.
500 */
501
b4e08ea1 502 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
33b64eb2 503 struct ieee80211_mgmt *mgmt;
d6d1a5a7 504
a7767f95 505 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 506 return RX_DROP_MONITOR;
507
a7767f95 508 if (ieee80211_is_action(hdr->frame_control)) {
33b64eb2 509 mgmt = (struct ieee80211_mgmt *)hdr;
0938393f 510 if (mgmt->u.action.category != MESH_PLINK_CATEGORY)
33b64eb2 511 return RX_DROP_MONITOR;
33b64eb2 512 return RX_CONTINUE;
33b64eb2
LCC		 513 }
514
a7767f95
HH		 515 if (ieee80211_is_probe_req(hdr->frame_control) ||
516 ieee80211_is_probe_resp(hdr->frame_control) ||
517 ieee80211_is_beacon(hdr->frame_control))
518 return RX_CONTINUE;
519
520 return RX_DROP_MONITOR;
521
522 }
523
524#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
525
526 if (ieee80211_is_data(hdr->frame_control) &&
527 is_multicast_ether_addr(hdr->addr1) &&
3c5772a5 528 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
33b64eb2 529 return RX_DROP_MONITOR;
902acc78 530#undef msh_h_get
d6d1a5a7 531
902acc78
JB		 532 return RX_CONTINUE;
533}
33b64eb2
LCC		 534
535
49461622 536static ieee80211_rx_result debug_noinline
5cf121c3 537ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 538{
a7767f95 539 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 540
541 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
542 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 543 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
5cf121c3 544 rx->sta->last_seq_ctrl[rx->queue] ==
571ecf67 545 hdr->seq_ctrl)) {
5cf121c3 546 if (rx->flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 547 rx->local->dot11FrameDuplicateCount++;
548 rx->sta->num_duplicates++;
549 }
e4c26add 550 return RX_DROP_MONITOR;
571ecf67 551 } else
5cf121c3 552 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
571ecf67
JB		 553 }
554
571ecf67
JB		 555 if (unlikely(rx->skb->len < 16)) {
556 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 557 return RX_DROP_MONITOR;
571ecf67
JB		 558 }
559
571ecf67
JB		 560 /* Drop disallowed frame classes based on STA auth/assoc state;
561 * IEEE 802.11, Chap 5.5.
562 *
ccd7b362
JB		 563 * mac80211 filters only based on association state, i.e. it drops
564 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 565 * deauth/disassoc frames when needed. In addition, hostapd is
566 * responsible for filtering on both auth and assoc states.
567 */
33b64eb2 568
902acc78 569 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 570 return ieee80211_rx_mesh_check(rx);
33b64eb2 571
a7767f95
HH		 572 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
573 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 574 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
07346f81 575 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
a7767f95
HH		 576 if ((!ieee80211_has_fromds(hdr->frame_control) &&
577 !ieee80211_has_tods(hdr->frame_control) &&
578 ieee80211_is_data(hdr->frame_control)) ||
579 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
571ecf67
JB		 580 /* Drop IBSS frames and frames for other hosts
581 * silently. */
e4c26add 582 return RX_DROP_MONITOR;
571ecf67
JB		 583 }
584
e4c26add 585 return RX_DROP_MONITOR;
571ecf67
JB		 586 }
587
9ae54c84 588 return RX_CONTINUE;
570bd537
JB		 589}
590
591
49461622 592static ieee80211_rx_result debug_noinline
5cf121c3 593ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 594{
a7767f95 595 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
3017b80b
JB		 596 int keyidx;
597 int hdrlen;
e4c26add 598 ieee80211_rx_result result = RX_DROP_UNUSABLE;
d4e46a3d 599 struct ieee80211_key *stakey = NULL;
3cfcf6ac 600 int mmie_keyidx = -1;
570bd537 601
3017b80b
JB		 602 /*
603 * Key selection 101
604 *
3cfcf6ac 605 * There are four types of keys:
3017b80b 606 * - GTK (group keys)
3cfcf6ac 607 * - IGTK (group keys for management frames)
3017b80b
JB		 608 * - PTK (pairwise keys)
609 * - STK (station-to-station pairwise keys)
610 *
611 * When selecting a key, we have to distinguish between multicast
612 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 613 * use PTKs and STKs while the former always use GTKs and IGTKs.
614 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
615 * unicast frames can also use key indices like GTKs. Hence, if we
616 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 617 *
8dc06a1c
JB		 618 * Note that in a regular BSS, multicast frames are sent by the
619 * AP only, associated stations unicast the frame to the AP first
620 * which then multicasts it on their behalf.
621 *
3017b80b
JB		 622 * There is also a slight problem in IBSS mode: GTKs are negotiated
623 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 624 * The spec seems to expect that one negotiates the same key with
625 * every station but there's no such requirement; VLANs could be
626 * possible.
3017b80b
JB		 627 */
628
3017b80b 629 /*
1990af8d 630 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 631 * addressed to us nor a multicast frame.
632 */
5cf121c3 633 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 634 return RX_CONTINUE;
3017b80b 635
d4e46a3d
JB		 636 if (rx->sta)
637 stakey = rcu_dereference(rx->sta->key);
638
0c7c10c7
JM		 639 if (!ieee80211_has_protected(hdr->frame_control))
640 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
641
d4e46a3d
JB		 642 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
643 rx->key = stakey;
0c7c10c7
JM		 644 /* Skip decryption if the frame is not protected. */
645 if (!ieee80211_has_protected(hdr->frame_control))
646 return RX_CONTINUE;
3cfcf6ac
JM		 647 } else if (mmie_keyidx >= 0) {
648 /* Broadcast/multicast robust management frame / BIP */
649 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
650 (rx->status->flag & RX_FLAG_IV_STRIPPED))
651 return RX_CONTINUE;
652
653 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
654 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
655 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
656 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
0c7c10c7
JM		 657 } else if (!ieee80211_has_protected(hdr->frame_control)) {
658 /*
659 * The frame was not protected, so skip decryption. However, we
660 * need to set rx->key if there is a key that could have been
661 * used so that the frame may be dropped if encryption would
662 * have been expected.
663 */
664 struct ieee80211_key *key = NULL;
665 if (ieee80211_is_mgmt(hdr->frame_control) &&
666 is_multicast_ether_addr(hdr->addr1) &&
667 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
668 rx->key = key;
669 else if ((key = rcu_dereference(rx->sdata->default_key)))
670 rx->key = key;
671 return RX_CONTINUE;
571ecf67 672 } else {
3017b80b
JB		 673 /*
674 * The device doesn't give us the IV so we won't be
675 * able to look up the key. That's ok though, we
676 * don't need to decrypt the frame, we just won't
677 * be able to keep statistics accurate.
678 * Except for key threshold notifications, should
679 * we somehow allow the driver to tell us which key
680 * the hardware used if this flag is set?
681 */
5cf121c3
JB		 682 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
683 (rx->status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 684 return RX_CONTINUE;
3017b80b 685
a7767f95 686 hdrlen = ieee80211_hdrlen(hdr->frame_control);
3017b80b
JB		 687
688 if (rx->skb->len < 8 + hdrlen)
e4c26add 689 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 690
691 /*
692 * no need to call ieee80211_wep_get_keyidx,
693 * it verifies a bunch of things we've done already
694 */
695 keyidx = rx->skb->data[hdrlen + 3] >> 6;
696
d4e46a3d 697 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
3017b80b
JB		 698
699 /*
700 * RSNA-protected unicast frames should always be sent with
701 * pairwise or station-to-station keys, but for WEP we allow
702 * using a key index as well.
703 */
8f20fc24 704 if (rx->key && rx->key->conf.alg != ALG_WEP &&
3017b80b
JB		 705 !is_multicast_ether_addr(hdr->addr1))
706 rx->key = NULL;
571ecf67
JB		 707 }
708
3017b80b 709 if (rx->key) {
571ecf67 710 rx->key->tx_rx_count++;
011bfcc4 711 /* TODO: add threshold stuff again */
1990af8d 712 } else {
e4c26add 713 return RX_DROP_MONITOR;
70f08765
JB		 714 }
715
1990af8d
JB		 716 /* Check for weak IVs if possible */
717 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
a7767f95 718 ieee80211_is_data(hdr->frame_control) &&
5cf121c3
JB		 719 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
720 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
1990af8d
JB		 721 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
722 rx->sta->wep_weak_iv_count++;
723
70f08765
JB		 724 switch (rx->key->conf.alg) {
725 case ALG_WEP:
e2f036da
MN		 726 result = ieee80211_crypto_wep_decrypt(rx);
727 break;
70f08765 728 case ALG_TKIP:
e2f036da
MN		 729 result = ieee80211_crypto_tkip_decrypt(rx);
730 break;
70f08765 731 case ALG_CCMP:
e2f036da
MN		 732 result = ieee80211_crypto_ccmp_decrypt(rx);
733 break;
3cfcf6ac
JM		 734 case ALG_AES_CMAC:
735 result = ieee80211_crypto_aes_cmac_decrypt(rx);
736 break;
70f08765
JB		 737 }
738
e2f036da 739 /* either the frame has been decrypted or will be dropped */
5cf121c3 740 rx->status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 741
742 return result;
70f08765
JB		 743}
744
572e0012
KV		 745static ieee80211_rx_result debug_noinline
746ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
747{
748 struct ieee80211_local *local;
749 struct ieee80211_hdr *hdr;
750 struct sk_buff *skb;
751
752 local = rx->local;
753 skb = rx->skb;
754 hdr = (struct ieee80211_hdr *) skb->data;
755
756 if (!local->pspolling)
757 return RX_CONTINUE;
758
759 if (!ieee80211_has_fromds(hdr->frame_control))
760 /* this is not from AP */
761 return RX_CONTINUE;
762
763 if (!ieee80211_is_data(hdr->frame_control))
764 return RX_CONTINUE;
765
766 if (!ieee80211_has_moredata(hdr->frame_control)) {
767 /* AP has no more frames buffered for us */
768 local->pspolling = false;
769 return RX_CONTINUE;
770 }
771
772 /* more data bit is set, let's request a new frame from the AP */
773 ieee80211_send_pspoll(local, rx->sdata);
774
775 return RX_CONTINUE;
776}
777
133b8226 778static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 779{
133b8226 780 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 781 struct ieee80211_local *local = sdata->local;
0795af57 782
3e122be0 783 atomic_inc(&sdata->bss->num_sta_ps);
af818581 784 set_sta_flags(sta, WLAN_STA_PS_STA);
24487981 785 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 786#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26
JB		 787 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
788 sdata->dev->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 789#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
790}
791
ff9458d3 792static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 793{
133b8226 794 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 795
3e122be0 796 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 797
af818581 798 clear_sta_flags(sta, WLAN_STA_PS_STA);
004c872e 799
571ecf67 800#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26
JB		 801 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
802 sdata->dev->name, sta->sta.addr, sta->sta.aid);
571ecf67 803#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 804
af818581 805 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 806#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581
JB		 807 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
808 sdata->dev->name, sta->sta.addr, sta->sta.aid);
571ecf67 809#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 810 return;
811 }
812
813 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 814}
815
49461622 816static ieee80211_rx_result debug_noinline
5cf121c3 817ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 818{
819 struct sta_info *sta = rx->sta;
a7767f95 820 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 821
822 if (!sta)
9ae54c84 823 return RX_CONTINUE;
571ecf67 824
b291ba11
JB		 825 /*
826 * Update last_rx only for IBSS packets which are for the current
827 * BSSID to avoid keeping the current IBSS network alive in cases
828 * where other STAs start using different BSSID.
829 */
05c914fe 830 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 831 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 832 NL80211_IFTYPE_ADHOC);
46900298 833 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
571ecf67 834 sta->last_rx = jiffies;
b291ba11
JB		 835 } else if (!is_multicast_ether_addr(hdr->addr1)) {
836 /*
33b64eb2
LCC		 837 * Mesh beacons will update last_rx when if they are found to
838 * match the current local configuration when processed.
571ecf67 839 */
b291ba11 840 sta->last_rx = jiffies;
571ecf67
JB		 841 }
842
5cf121c3 843 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 844 return RX_CONTINUE;
571ecf67 845
3cf335d5
KV		 846 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
847 ieee80211_sta_rx_notify(rx->sdata, hdr);
848
571ecf67
JB		 849 sta->rx_fragments++;
850 sta->rx_bytes += rx->skb->len;
5cf121c3
JB		 851 sta->last_signal = rx->status->signal;
852 sta->last_noise = rx->status->noise;
571ecf67 853
72eaa43a
JB		 854 /*
855 * Change STA power saving mode only at the end of a frame
856 * exchange sequence.
857 */
3e122be0 858 if (!ieee80211_has_morefrags(hdr->frame_control) &&
05c914fe
JB		 859 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
860 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 861 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 862 /*
863 * Ignore doze->wake transitions that are
864 * indicated by non-data frames, the standard
865 * is unclear here, but for example going to
866 * PS mode and then scanning would cause a
867 * doze->wake transition for the probe request,
868 * and that is clearly undesirable.
869 */
870 if (ieee80211_is_data(hdr->frame_control) &&
871 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 872 ap_sta_ps_end(sta);
72eaa43a
JB		 873 } else {
874 if (ieee80211_has_pm(hdr->frame_control))
875 ap_sta_ps_start(sta);
876 }
571ecf67
JB		 877 }
878
22403def
JB		 879 /*
880 * Drop (qos-)data::nullfunc frames silently, since they
881 * are used only to control station power saving mode.
882 */
883 if (ieee80211_is_nullfunc(hdr->frame_control) ||
884 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 885 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
22403def
JB		 886 /*
887 * Update counter and free packet here to avoid
888 * counting this as a dropped packed.
889 */
571ecf67
JB		 890 sta->rx_packets++;
891 dev_kfree_skb(rx->skb);
9ae54c84 892 return RX_QUEUED;
571ecf67
JB		 893 }
894
9ae54c84 895 return RX_CONTINUE;
571ecf67
JB		 896} /* ieee80211_rx_h_sta_process */
897
571ecf67
JB		 898static inline struct ieee80211_fragment_entry *
899ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
900 unsigned int frag, unsigned int seq, int rx_queue,
901 struct sk_buff **skb)
902{
903 struct ieee80211_fragment_entry *entry;
904 int idx;
905
906 idx = sdata->fragment_next;
907 entry = &sdata->fragments[sdata->fragment_next++];
908 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
909 sdata->fragment_next = 0;
910
911 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 912#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 913 struct ieee80211_hdr *hdr =
914 (struct ieee80211_hdr *) entry->skb_list.next->data;
915 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
916 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 917 "addr1=%pM addr2=%pM\n",
571ecf67
JB		 918 sdata->dev->name, idx,
919 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 920 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 921#endif
571ecf67
JB		 922 __skb_queue_purge(&entry->skb_list);
923 }
924
925 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
926 *skb = NULL;
927 entry->first_frag_time = jiffies;
928 entry->seq = seq;
929 entry->rx_queue = rx_queue;
930 entry->last_frag = frag;
931 entry->ccmp = 0;
932 entry->extra_len = 0;
933
934 return entry;
935}
936
937static inline struct ieee80211_fragment_entry *
938ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 939 unsigned int frag, unsigned int seq,
571ecf67
JB		 940 int rx_queue, struct ieee80211_hdr *hdr)
941{
942 struct ieee80211_fragment_entry *entry;
943 int i, idx;
944
945 idx = sdata->fragment_next;
946 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
947 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 948
949 idx--;
950 if (idx < 0)
951 idx = IEEE80211_FRAGMENT_MAX - 1;
952
953 entry = &sdata->fragments[idx];
954 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
955 entry->rx_queue != rx_queue ||
956 entry->last_frag + 1 != frag)
957 continue;
958
b73d70ad 959 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 960
b73d70ad
HH		 961 /*
962 * Check ftype and addresses are equal, else check next fragment
963 */
964 if (((hdr->frame_control ^ f_hdr->frame_control) &
965 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 966 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
967 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
968 continue;
969
ab46623e 970 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 971 __skb_queue_purge(&entry->skb_list);
972 continue;
973 }
974 return entry;
975 }
976
977 return NULL;
978}
979
49461622 980static ieee80211_rx_result debug_noinline
5cf121c3 981ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 982{
983 struct ieee80211_hdr *hdr;
984 u16 sc;
358c8d9d 985 __le16 fc;
571ecf67
JB		 986 unsigned int frag, seq;
987 struct ieee80211_fragment_entry *entry;
988 struct sk_buff *skb;
989
b73d70ad 990 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 991 fc = hdr->frame_control;
571ecf67
JB		 992 sc = le16_to_cpu(hdr->seq_ctrl);
993 frag = sc & IEEE80211_SCTL_FRAG;
994
358c8d9d 995 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 996 (rx->skb)->len < 24 ||
997 is_multicast_ether_addr(hdr->addr1))) {
998 /* not fragmented */
999 goto out;
1000 }
1001 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1002
1003 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1004
1005 if (frag == 0) {
1006 /* This is the first fragment of a new frame. */
1007 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 1008 rx->queue, &(rx->skb));
8f20fc24 1009 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
358c8d9d 1010 ieee80211_has_protected(fc)) {
571ecf67
JB		 1011 /* Store CCMP PN so that we can verify that the next
1012 * fragment has a sequential PN value. */
1013 entry->ccmp = 1;
1014 memcpy(entry->last_pn,
5cf121c3 1015 rx->key->u.ccmp.rx_pn[rx->queue],
571ecf67
JB		 1016 CCMP_PN_LEN);
1017 }
9ae54c84 1018 return RX_QUEUED;
571ecf67
JB		 1019 }
1020
1021 /* This is a fragment for a frame that should already be pending in
1022 * fragment cache. Add this fragment to the end of the pending entry.
1023 */
b73d70ad 1024 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 1025 if (!entry) {
1026 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1027 return RX_DROP_MONITOR;
571ecf67
JB		 1028 }
1029
1030 /* Verify that MPDUs within one MSDU have sequential PN values.
1031 * (IEEE 802.11i, 8.3.3.4.5) */
1032 if (entry->ccmp) {
1033 int i;
1034 u8 pn[CCMP_PN_LEN], *rpn;
8f20fc24 1035 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
e4c26add 1036 return RX_DROP_UNUSABLE;
571ecf67
JB		 1037 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1038 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1039 pn[i]++;
1040 if (pn[i])
1041 break;
1042 }
5cf121c3 1043 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
f4ea83dd 1044 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1045 return RX_DROP_UNUSABLE;
571ecf67
JB		 1046 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1047 }
1048
358c8d9d 1049 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1050 __skb_queue_tail(&entry->skb_list, rx->skb);
1051 entry->last_frag = frag;
1052 entry->extra_len += rx->skb->len;
358c8d9d 1053 if (ieee80211_has_morefrags(fc)) {
571ecf67 1054 rx->skb = NULL;
9ae54c84 1055 return RX_QUEUED;
571ecf67
JB		 1056 }
1057
1058 rx->skb = __skb_dequeue(&entry->skb_list);
1059 if (skb_tailroom(rx->skb) < entry->extra_len) {
1060 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1061 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1062 GFP_ATOMIC))) {
1063 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1064 __skb_queue_purge(&entry->skb_list);
e4c26add 1065 return RX_DROP_UNUSABLE;
571ecf67
JB		 1066 }
1067 }
1068 while ((skb = __skb_dequeue(&entry->skb_list))) {
1069 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1070 dev_kfree_skb(skb);
1071 }
1072
1073 /* Complete frame has been reassembled - process it now */
5cf121c3 1074 rx->flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1075
1076 out:
1077 if (rx->sta)
1078 rx->sta->rx_packets++;
1079 if (is_multicast_ether_addr(hdr->addr1))
1080 rx->local->dot11MulticastReceivedFrameCount++;
1081 else
1082 ieee80211_led_rx(rx->local);
9ae54c84 1083 return RX_CONTINUE;
571ecf67
JB		 1084}
1085
49461622 1086static ieee80211_rx_result debug_noinline
5cf121c3 1087ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1088{
af818581 1089 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1090 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
571ecf67 1091
358c8d9d 1092 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
5cf121c3 1093 !(rx->flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1094 return RX_CONTINUE;
571ecf67 1095
05c914fe
JB		 1096 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1097 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1098 return RX_DROP_UNUSABLE;
98f0b0a3 1099
af818581
JB		 1100 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1101 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1102 else
1103 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1104
9ae54c84 1105 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1106 * count as an dropped frame. */
1107 dev_kfree_skb(rx->skb);
1108
9ae54c84 1109 return RX_QUEUED;
571ecf67
JB		 1110}
1111
49461622 1112static ieee80211_rx_result debug_noinline
5cf121c3 1113ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1114{
6e0d114d 1115 u8 *data = rx->skb->data;
238f74a2 1116 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1117
238f74a2 1118 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1119 return RX_CONTINUE;
6e0d114d
JB		 1120
1121 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1122 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1123 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1124 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1125 /* change frame type to non QOS */
238f74a2 1126 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1127
9ae54c84 1128 return RX_CONTINUE;
6e0d114d
JB		 1129}
1130
76ee65bf 1131static int
5cf121c3 1132ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1133{
07346f81 1134 if (unlikely(!rx->sta ||
f4ea83dd 1135 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1136 return -EACCES;
571ecf67 1137
76ee65bf 1138 return 0;
571ecf67
JB		 1139}
1140
76ee65bf 1141static int
358c8d9d 1142ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1143{
3017b80b 1144 /*
7848ba7d
JB		 1145 * Pass through unencrypted frames if the hardware has
1146 * decrypted them already.
3017b80b 1147 */
5cf121c3 1148 if (rx->status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1149 return 0;
571ecf67
JB		 1150
1151 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1152 if (unlikely(!ieee80211_has_protected(fc) &&
1153 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1154 ieee80211_is_data(fc) &&
b3fc9c6c 1155 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1156 return -EACCES;
f2ca3ea4
JM		 1157 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1158 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1159 rx->key))
1160 return -EACCES;
1161 /* BIP does not use Protected field, so need to check MMIE */
1162 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb)
1163 && ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1164 rx->key))
1165 return -EACCES;
1166 /*
1167 * When using MFP, Action frames are not allowed prior to
1168 * having configured keys.
1169 */
1170 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1171 ieee80211_is_robust_mgmt_frame(
1172 (struct ieee80211_hdr *) rx->skb->data)))
1173 return -EACCES;
1174 }
b3fc9c6c 1175
76ee65bf 1176 return 0;
571ecf67
JB		 1177}
1178
76ee65bf 1179static int
e31a16d6 1180__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67
JB		 1181{
1182 struct net_device *dev = rx->dev;
571ecf67
JB		 1183 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1184
e31a16d6 1185 return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
76ee65bf 1186}
571ecf67 1187
ce3edf6d
JB		 1188/*
1189 * requires that rx->skb is a frame with ethernet header
1190 */
358c8d9d 1191static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1192{
c97c23e3 1193 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1194 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1195 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1196
1197 /*
1198 * Allow EAPOL frames to us/the PAE group address regardless
1199 * of whether the frame was encrypted or not.
1200 */
1201 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1202 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1203 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1204 return true;
1205
1206 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1207 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1208 return false;
1209
1210 return true;
1211}
1212
1213/*
1214 * requires that rx->skb is a frame with ethernet header
1215 */
76ee65bf 1216static void
5cf121c3 1217ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf
RR		 1218{
1219 struct net_device *dev = rx->dev;
1220 struct ieee80211_local *local = rx->local;
1221 struct sk_buff *skb, *xmit_skb;
1222 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ce3edf6d
JB		 1223 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1224 struct sta_info *dsta;
571ecf67 1225
76ee65bf
RR		 1226 skb = rx->skb;
1227 xmit_skb = NULL;
571ecf67 1228
05c914fe
JB		 1229 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1230 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1231 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
5cf121c3 1232 (rx->flags & IEEE80211_RX_RA_MATCH)) {
ce3edf6d
JB		 1233 if (is_multicast_ether_addr(ehdr->h_dest)) {
1234 /*
1235 * send multicast frames both to higher layers in
1236 * local net stack and back to the wireless medium
1237 */
76ee65bf
RR		 1238 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1239 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1240 printk(KERN_DEBUG "%s: failed to clone "
1241 "multicast frame\n", dev->name);
1242 } else {
571ecf67 1243 dsta = sta_info_get(local, skb->data);
d0709a65 1244 if (dsta && dsta->sdata->dev == dev) {
ce3edf6d
JB		 1245 /*
1246 * The destination station is associated to
1247 * this AP (in this VLAN), so send the frame
1248 * directly to it and do not pass it to local
1249 * net stack.
571ecf67 1250 */
76ee65bf 1251 xmit_skb = skb;
571ecf67
JB		 1252 skb = NULL;
1253 }
571ecf67
JB		 1254 }
1255 }
1256
1257 if (skb) {
d1c3a37c
JB		 1258 int align __maybe_unused;
1259
1260#if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1261 /*
1262 * 'align' will only take the values 0 or 2 here
1263 * since all frames are required to be aligned
1264 * to 2-byte boundaries when being passed to
1265 * mac80211. That also explains the __skb_push()
1266 * below.
1267 */
dacb6f1d 1268 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1269 if (align) {
1270 if (WARN_ON(skb_headroom(skb) < 3)) {
1271 dev_kfree_skb(skb);
1272 skb = NULL;
1273 } else {
1274 u8 *data = skb->data;
8ce0b589
ZY		 1275 size_t len = skb_headlen(skb);
1276 skb->data -= align;
1277 memmove(skb->data, data, len);
1278 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1279 }
1280 }
1281#endif
1282
1283 if (skb) {
1284 /* deliver to local stack */
1285 skb->protocol = eth_type_trans(skb, dev);
1286 memset(skb->cb, 0, sizeof(skb->cb));
1287 netif_rx(skb);
1288 }
571ecf67
JB		 1289 }
1290
76ee65bf 1291 if (xmit_skb) {
571ecf67 1292 /* send to wireless media */
f831e909 1293 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1294 skb_reset_network_header(xmit_skb);
1295 skb_reset_mac_header(xmit_skb);
76ee65bf 1296 dev_queue_xmit(xmit_skb);
571ecf67 1297 }
76ee65bf
RR		 1298}
1299
49461622 1300static ieee80211_rx_result debug_noinline
5cf121c3 1301ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f
RR		 1302{
1303 struct net_device *dev = rx->dev;
1304 struct ieee80211_local *local = rx->local;
358c8d9d 1305 u16 ethertype;
fd4c7f2f
RR		 1306 u8 *payload;
1307 struct sk_buff *skb = rx->skb, *frame = NULL;
358c8d9d
HH		 1308 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1309 __le16 fc = hdr->frame_control;
fd4c7f2f
RR		 1310 const struct ethhdr *eth;
1311 int remaining, err;
1312 u8 dst[ETH_ALEN];
1313 u8 src[ETH_ALEN];
fd4c7f2f 1314
358c8d9d 1315 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1316 return RX_CONTINUE;
fd4c7f2f 1317
358c8d9d 1318 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1319 return RX_DROP_MONITOR;
fd4c7f2f 1320
5cf121c3 1321 if (!(rx->flags & IEEE80211_RX_AMSDU))
9ae54c84 1322 return RX_CONTINUE;
fd4c7f2f 1323
e31a16d6 1324 err = __ieee80211_data_to_8023(rx);
fd4c7f2f 1325 if (unlikely(err))
e4c26add 1326 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1327
1328 skb->dev = dev;
1329
1330 dev->stats.rx_packets++;
1331 dev->stats.rx_bytes += skb->len;
1332
1333 /* skip the wrapping header */
1334 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1335 if (!eth)
e4c26add 1336 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1337
1338 while (skb != frame) {
1339 u8 padding;
1340 __be16 len = eth->h_proto;
1341 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1342
1343 remaining = skb->len;
1344 memcpy(dst, eth->h_dest, ETH_ALEN);
1345 memcpy(src, eth->h_source, ETH_ALEN);
1346
1347 padding = ((4 - subframe_len) & 0x3);
1348 /* the last MSDU has no padding */
f4ea83dd 1349 if (subframe_len > remaining)
e4c26add 1350 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1351
1352 skb_pull(skb, sizeof(struct ethhdr));
1353 /* if last subframe reuse skb */
1354 if (remaining <= subframe_len + padding)
1355 frame = skb;
1356 else {
d1c3a37c
JB		 1357 /*
1358 * Allocate and reserve two bytes more for payload
1359 * alignment since sizeof(struct ethhdr) is 14.
1360 */
1361 frame = dev_alloc_skb(
1362 ALIGN(local->hw.extra_tx_headroom, 4) +
1363 subframe_len + 2);
fd4c7f2f
RR		 1364
1365 if (frame == NULL)
e4c26add 1366 return RX_DROP_UNUSABLE;
fd4c7f2f 1367
d1c3a37c
JB		 1368 skb_reserve(frame,
1369 ALIGN(local->hw.extra_tx_headroom, 4) +
1370 sizeof(struct ethhdr) + 2);
fd4c7f2f
RR		 1371 memcpy(skb_put(frame, ntohs(len)), skb->data,
1372 ntohs(len));
1373
1374 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1375 padding);
1376 if (!eth) {
fd4c7f2f 1377 dev_kfree_skb(frame);
e4c26add 1378 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1379 }
1380 }
1381
ce3edf6d 1382 skb_reset_network_header(frame);
fd4c7f2f
RR		 1383 frame->dev = dev;
1384 frame->priority = skb->priority;
1385 rx->skb = frame;
1386
fd4c7f2f
RR		 1387 payload = frame->data;
1388 ethertype = (payload[6] << 8) | payload[7];
1389
1390 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
ce3edf6d
JB		 1391 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1392 compare_ether_addr(payload,
1393 bridge_tunnel_header) == 0)) {
fd4c7f2f
RR		 1394 /* remove RFC1042 or Bridge-Tunnel
1395 * encapsulation and replace EtherType */
1396 skb_pull(frame, 6);
1397 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1398 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1399 } else {
ce3edf6d
JB		 1400 memcpy(skb_push(frame, sizeof(__be16)),
1401 &len, sizeof(__be16));
fd4c7f2f
RR		 1402 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1403 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1404 }
1405
358c8d9d 1406 if (!ieee80211_frame_allowed(rx, fc)) {
ce3edf6d 1407 if (skb == frame) /* last frame */
e4c26add 1408 return RX_DROP_UNUSABLE;
ce3edf6d
JB		 1409 dev_kfree_skb(frame);
1410 continue;
1411 }
fd4c7f2f
RR		 1412
1413 ieee80211_deliver_skb(rx);
1414 }
1415
9ae54c84 1416 return RX_QUEUED;
fd4c7f2f
RR		 1417}
1418
bf94e17b 1419#ifdef CONFIG_MAC80211_MESH
b0dee578 1420static ieee80211_rx_result
e32f85f7
LCC		 1421ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1422{
1423 struct ieee80211_hdr *hdr;
1424 struct ieee80211s_hdr *mesh_hdr;
1425 unsigned int hdrlen;
1426 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1427 struct ieee80211_local *local = rx->local;
249b405c 1428 struct ieee80211_sub_if_data *sdata;
e32f85f7
LCC		 1429
1430 hdr = (struct ieee80211_hdr *) skb->data;
1431 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1432 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
249b405c 1433 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
e32f85f7
LCC		 1434
1435 if (!ieee80211_is_data(hdr->frame_control))
1436 return RX_CONTINUE;
1437
1438 if (!mesh_hdr->ttl)
1439 /* illegal frame */
1440 return RX_DROP_MONITOR;
1441
43b7b314 1442 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1443 struct mesh_path *mppath;
43b7b314
JC		 1444 char *proxied_addr;
1445 char *mpp_addr;
1446
1447 if (is_multicast_ether_addr(hdr->addr1)) {
1448 mpp_addr = hdr->addr3;
1449 proxied_addr = mesh_hdr->eaddr1;
1450 } else {
1451 mpp_addr = hdr->addr4;
1452 proxied_addr = mesh_hdr->eaddr2;
1453 }
79617dee 1454
79617dee 1455 rcu_read_lock();
43b7b314 1456 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1457 if (!mppath) {
43b7b314 1458 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1459 } else {
1460 spin_lock_bh(&mppath->state_lock);
1461 mppath->exp_time = jiffies;
43b7b314
JC		 1462 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1463 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1464 spin_unlock_bh(&mppath->state_lock);
1465 }
1466 rcu_read_unlock();
1467 }
1468
3c5772a5
JC		 1469 /* Frame has reached destination. Don't forward */
1470 if (!is_multicast_ether_addr(hdr->addr1) &&
1471 compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
e32f85f7
LCC		 1472 return RX_CONTINUE;
1473
1474 mesh_hdr->ttl--;
1475
1476 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1477 if (!mesh_hdr->ttl)
472dbc45 1478 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1479 dropped_frames_ttl);
1480 else {
1481 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1482 struct ieee80211_tx_info *info;
1483
e32f85f7
LCC		 1484 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1485
1486 if (!fwd_skb && net_ratelimit())
1487 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1488 rx->dev->name);
1489
1490 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
e32f85f7 1491 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
3b8d81e0
JB		 1492 info = IEEE80211_SKB_CB(fwd_skb);
1493 memset(info, 0, sizeof(*info));
1494 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1495 info->control.vif = &rx->sdata->vif;
3b8d81e0 1496 ieee80211_select_queue(local, fwd_skb);
c8a61a7d
DW		 1497 if (is_multicast_ether_addr(fwd_hdr->addr1))
1498 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1499 fwded_mcast);
1500 else {
3c5772a5
JC		 1501 int err;
1502 /*
1503 * Save TA to addr1 to send TA a path error if a
1504 * suitable next hop is not found
1505 */
1506 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1507 ETH_ALEN);
3c5772a5 1508 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1509 /* Failed to immediately resolve next hop:
1510 * fwded frame was dropped or will be added
1511 * later to the pending skb queue. */
1512 if (err)
1513 return RX_DROP_MONITOR;
c8a61a7d
DW		 1514
1515 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1516 fwded_unicast);
249b405c
JC		 1517 }
1518 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1519 fwded_frames);
3b8d81e0 1520 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1521 }
1522 }
1523
3c5772a5 1524 if (is_multicast_ether_addr(hdr->addr1) ||
e32f85f7
LCC		 1525 rx->dev->flags & IFF_PROMISC)
1526 return RX_CONTINUE;
1527 else
1528 return RX_DROP_MONITOR;
1529}
bf94e17b 1530#endif
e32f85f7 1531
49461622 1532static ieee80211_rx_result debug_noinline
5cf121c3 1533ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf
RR		 1534{
1535 struct net_device *dev = rx->dev;
358c8d9d
HH		 1536 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1537 __le16 fc = hdr->frame_control;
ce3edf6d 1538 int err;
76ee65bf 1539
358c8d9d 1540 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1541 return RX_CONTINUE;
76ee65bf 1542
358c8d9d 1543 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1544 return RX_DROP_MONITOR;
76ee65bf 1545
e31a16d6 1546 err = __ieee80211_data_to_8023(rx);
76ee65bf 1547 if (unlikely(err))
e4c26add 1548 return RX_DROP_UNUSABLE;
76ee65bf 1549
358c8d9d 1550 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1551 return RX_DROP_MONITOR;
ce3edf6d 1552
76ee65bf
RR		 1553 rx->skb->dev = dev;
1554
1555 dev->stats.rx_packets++;
1556 dev->stats.rx_bytes += rx->skb->len;
1557
1558 ieee80211_deliver_skb(rx);
571ecf67 1559
9ae54c84 1560 return RX_QUEUED;
571ecf67
JB		 1561}
1562
49461622 1563static ieee80211_rx_result debug_noinline
5cf121c3 1564ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 1565{
1566 struct ieee80211_local *local = rx->local;
1567 struct ieee80211_hw *hw = &local->hw;
1568 struct sk_buff *skb = rx->skb;
a7767f95 1569 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1570 struct tid_ampdu_rx *tid_agg_rx;
1571 u16 start_seq_num;
1572 u16 tid;
1573
a7767f95 1574 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1575 return RX_CONTINUE;
71364716 1576
a7767f95 1577 if (ieee80211_is_back_req(bar->frame_control)) {
71364716 1578 if (!rx->sta)
9ae54c84 1579 return RX_CONTINUE;
71364716 1580 tid = le16_to_cpu(bar->control) >> 12;
cee24a3e
RR		 1581 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1582 != HT_AGG_STATE_OPERATIONAL)
9ae54c84 1583 return RX_CONTINUE;
cee24a3e 1584 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
71364716
RR		 1585
1586 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1587
1588 /* reset session timer */
20ad19d0
JB		 1589 if (tid_agg_rx->timeout)
1590 mod_timer(&tid_agg_rx->session_timer,
1591 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716
RR		 1592
1593 /* manage reordering buffer according to requested */
1594 /* sequence number */
1595 rcu_read_lock();
f1d58c25 1596 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
71364716
RR		 1597 start_seq_num, 1);
1598 rcu_read_unlock();
e4c26add 1599 return RX_DROP_UNUSABLE;
71364716
RR		 1600 }
1601
9ae54c84 1602 return RX_CONTINUE;
71364716
RR		 1603}
1604
f4f727a6
JM		 1605static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1606 struct ieee80211_mgmt *mgmt,
1607 size_t len)
fea14732
JM		 1608{
1609 struct ieee80211_local *local = sdata->local;
1610 struct sk_buff *skb;
1611 struct ieee80211_mgmt *resp;
1612
1613 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1614 /* Not to own unicast address */
1615 return;
1616 }
1617
46900298
JB		 1618 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1619 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 1620 /* Not from the current AP or not associated yet. */
fea14732
JM		 1621 return;
1622 }
1623
1624 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1625 /* Too short SA Query request frame */
1626 return;
1627 }
1628
1629 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1630 if (skb == NULL)
1631 return;
1632
1633 skb_reserve(skb, local->hw.extra_tx_headroom);
1634 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1635 memset(resp, 0, 24);
1636 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1637 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
46900298 1638 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 1639 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1640 IEEE80211_STYPE_ACTION);
1641 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1642 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1643 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1644 memcpy(resp->u.action.u.sa_query.trans_id,
1645 mgmt->u.action.u.sa_query.trans_id,
1646 WLAN_SA_QUERY_TR_ID_LEN);
1647
1648 ieee80211_tx_skb(sdata, skb, 1);
1649}
1650
de1ede7a
JB		 1651static ieee80211_rx_result debug_noinline
1652ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1653{
1654 struct ieee80211_local *local = rx->local;
1655 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1656 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1657 int len = rx->skb->len;
1658
1659 if (!ieee80211_is_action(mgmt->frame_control))
1660 return RX_CONTINUE;
1661
1662 if (!rx->sta)
1663 return RX_DROP_MONITOR;
1664
1665 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1666 return RX_DROP_MONITOR;
1667
97ebe12a
JM		 1668 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1669 return RX_DROP_MONITOR;
1670
de1ede7a
JB		 1671 /* all categories we currently handle have action_code */
1672 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1673 return RX_DROP_MONITOR;
1674
de1ede7a
JB		 1675 switch (mgmt->u.action.category) {
1676 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 1677 /*
1678 * The aggregation code is not prepared to handle
1679 * anything but STA/AP due to the BSSID handling;
1680 * IBSS could work in the code but isn't supported
1681 * by drivers or the standard.
1682 */
1683 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1684 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1685 sdata->vif.type != NL80211_IFTYPE_AP)
1686 return RX_DROP_MONITOR;
1687
de1ede7a
JB		 1688 switch (mgmt->u.action.u.addba_req.action_code) {
1689 case WLAN_ACTION_ADDBA_REQ:
1690 if (len < (IEEE80211_MIN_ACTION_SIZE +
1691 sizeof(mgmt->u.action.u.addba_req)))
1692 return RX_DROP_MONITOR;
1693 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1694 break;
1695 case WLAN_ACTION_ADDBA_RESP:
1696 if (len < (IEEE80211_MIN_ACTION_SIZE +
1697 sizeof(mgmt->u.action.u.addba_resp)))
1698 return RX_DROP_MONITOR;
1699 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1700 break;
1701 case WLAN_ACTION_DELBA:
1702 if (len < (IEEE80211_MIN_ACTION_SIZE +
1703 sizeof(mgmt->u.action.u.delba)))
1704 return RX_DROP_MONITOR;
1705 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1706 break;
1707 }
39192c0b
JB		 1708 break;
1709 case WLAN_CATEGORY_SPECTRUM_MGMT:
1710 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1711 return RX_DROP_MONITOR;
46900298
JB		 1712
1713 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1714 return RX_DROP_MONITOR;
1715
39192c0b
JB		 1716 switch (mgmt->u.action.u.measurement.action_code) {
1717 case WLAN_ACTION_SPCT_MSR_REQ:
1718 if (len < (IEEE80211_MIN_ACTION_SIZE +
1719 sizeof(mgmt->u.action.u.measurement)))
1720 return RX_DROP_MONITOR;
1721 ieee80211_process_measurement_req(sdata, mgmt, len);
1722 break;
c481ec97
S		 1723 case WLAN_ACTION_SPCT_CHL_SWITCH:
1724 if (len < (IEEE80211_MIN_ACTION_SIZE +
1725 sizeof(mgmt->u.action.u.chan_switch)))
1726 return RX_DROP_MONITOR;
1727
cc32abd4
JB		 1728 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1729 return RX_DROP_MONITOR;
1730
46900298 1731 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
c481ec97
S		 1732 return RX_DROP_MONITOR;
1733
77fdaa12 1734 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
39192c0b
JB		 1735 }
1736 break;
fea14732
JM		 1737 case WLAN_CATEGORY_SA_QUERY:
1738 if (len < (IEEE80211_MIN_ACTION_SIZE +
1739 sizeof(mgmt->u.action.u.sa_query)))
1740 return RX_DROP_MONITOR;
1741 switch (mgmt->u.action.u.sa_query.action) {
1742 case WLAN_ACTION_SA_QUERY_REQUEST:
1743 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1744 return RX_DROP_MONITOR;
1745 ieee80211_process_sa_query_req(sdata, mgmt, len);
1746 break;
1747 case WLAN_ACTION_SA_QUERY_RESPONSE:
1748 /*
1749 * SA Query response is currently only used in AP mode
1750 * and it is processed in user space.
1751 */
1752 return RX_CONTINUE;
1753 }
1754 break;
39192c0b
JB		 1755 default:
1756 return RX_CONTINUE;
de1ede7a
JB		 1757 }
1758
39192c0b
JB		 1759 rx->sta->rx_packets++;
1760 dev_kfree_skb(rx->skb);
1761 return RX_QUEUED;
de1ede7a
JB		 1762}
1763
49461622 1764static ieee80211_rx_result debug_noinline
5cf121c3 1765ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 1766{
759ef3eb 1767 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
97ebe12a 1768 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
571ecf67 1769
5cf121c3 1770 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
e4c26add 1771 return RX_DROP_MONITOR;
571ecf67 1772
97ebe12a
JM		 1773 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1774 return RX_DROP_MONITOR;
1775
472dbc45 1776 if (ieee80211_vif_is_mesh(&sdata->vif))
f1d58c25 1777 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
472dbc45 1778
3832c287 1779 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
f1d58c25 1780 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
f9d540ee 1781
7986cf95 1782 if (sdata->vif.type == NL80211_IFTYPE_STATION)
f1d58c25 1783 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
46900298 1784
7986cf95 1785 return RX_DROP_MONITOR;
571ecf67
JB		 1786}
1787
3b8d81e0 1788static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
5cf121c3 1789 struct ieee80211_rx_data *rx)
571ecf67 1790{
a7767f95
HH		 1791 int keyidx;
1792 unsigned int hdrlen;
571ecf67 1793
a7767f95 1794 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 1795 if (rx->skb->len >= hdrlen + 4)
1796 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1797 else
1798 keyidx = -1;
1799
8944b79f 1800 if (!rx->sta) {
aa0daf0e
JB		 1801 /*
1802 * Some hardware seem to generate incorrect Michael MIC
1803 * reports; ignore them to avoid triggering countermeasures.
1804 */
571ecf67
JB		 1805 goto ignore;
1806 }
1807
a7767f95 1808 if (!ieee80211_has_protected(hdr->frame_control))
571ecf67 1809 goto ignore;
571ecf67 1810
05c914fe 1811 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
aa0daf0e
JB		 1812 /*
1813 * APs with pairwise keys should never receive Michael MIC
1814 * errors for non-zero keyidx because these are reserved for
1815 * group keys and only the AP is sending real multicast
1816 * frames in the BSS.
1817 */
eb063c17 1818 goto ignore;
571ecf67
JB		 1819 }
1820
a7767f95
HH		 1821 if (!ieee80211_is_data(hdr->frame_control) &&
1822 !ieee80211_is_auth(hdr->frame_control))
571ecf67 1823 goto ignore;
571ecf67 1824
e6d6e342
JB		 1825 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
1826 GFP_ATOMIC);
571ecf67
JB		 1827 ignore:
1828 dev_kfree_skb(rx->skb);
1829 rx->skb = NULL;
1830}
1831
5cf121c3
JB		 1832/* TODO: use IEEE80211_RX_FRAGMENTED */
1833static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
3d30d949
MW		 1834{
1835 struct ieee80211_sub_if_data *sdata;
1836 struct ieee80211_local *local = rx->local;
1837 struct ieee80211_rtap_hdr {
1838 struct ieee80211_radiotap_header hdr;
1839 u8 flags;
1840 u8 rate;
1841 __le16 chan_freq;
1842 __le16 chan_flags;
1843 } __attribute__ ((packed)) *rthdr;
1844 struct sk_buff *skb = rx->skb, *skb2;
1845 struct net_device *prev_dev = NULL;
5cf121c3 1846 struct ieee80211_rx_status *status = rx->status;
3d30d949 1847
5cf121c3 1848 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
3d30d949
MW		 1849 goto out_free_skb;
1850
1851 if (skb_headroom(skb) < sizeof(*rthdr) &&
1852 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1853 goto out_free_skb;
1854
1855 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1856 memset(rthdr, 0, sizeof(*rthdr));
1857 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1858 rthdr->hdr.it_present =
1859 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1860 (1 << IEEE80211_RADIOTAP_RATE) |
1861 (1 << IEEE80211_RADIOTAP_CHANNEL));
1862
5cf121c3 1863 rthdr->rate = rx->rate->bitrate / 5;
3d30d949
MW		 1864 rthdr->chan_freq = cpu_to_le16(status->freq);
1865
1866 if (status->band == IEEE80211_BAND_5GHZ)
1867 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1868 IEEE80211_CHAN_5GHZ);
1869 else
1870 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1871 IEEE80211_CHAN_2GHZ);
1872
1873 skb_set_mac_header(skb, 0);
1874 skb->ip_summed = CHECKSUM_UNNECESSARY;
1875 skb->pkt_type = PACKET_OTHERHOST;
1876 skb->protocol = htons(ETH_P_802_2);
1877
1878 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1879 if (!netif_running(sdata->dev))
1880 continue;
1881
05c914fe 1882 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 1883 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1884 continue;
1885
1886 if (prev_dev) {
1887 skb2 = skb_clone(skb, GFP_ATOMIC);
1888 if (skb2) {
1889 skb2->dev = prev_dev;
1890 netif_rx(skb2);
1891 }
1892 }
1893
1894 prev_dev = sdata->dev;
1895 sdata->dev->stats.rx_packets++;
1896 sdata->dev->stats.rx_bytes += skb->len;
1897 }
1898
1899 if (prev_dev) {
1900 skb->dev = prev_dev;
1901 netif_rx(skb);
1902 skb = NULL;
1903 } else
1904 goto out_free_skb;
1905
5cf121c3 1906 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
3d30d949
MW		 1907 return;
1908
1909 out_free_skb:
1910 dev_kfree_skb(skb);
1911}
1912
571ecf67 1913
8944b79f 1914static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
5cf121c3 1915 struct ieee80211_rx_data *rx,
8944b79f 1916 struct sk_buff *skb)
58905290 1917{
58905290
JB		 1918 ieee80211_rx_result res = RX_DROP_MONITOR;
1919
8944b79f
JB		 1920 rx->skb = skb;
1921 rx->sdata = sdata;
1922 rx->dev = sdata->dev;
1923
e32f85f7
LCC		 1924#define CALL_RXH(rxh) \
1925 do { \
1926 res = rxh(rx); \
1927 if (res != RX_CONTINUE) \
1928 goto rxh_done; \
1929 } while (0);
49461622
JB		 1930
1931 CALL_RXH(ieee80211_rx_h_passive_scan)
1932 CALL_RXH(ieee80211_rx_h_check)
1933 CALL_RXH(ieee80211_rx_h_decrypt)
572e0012 1934 CALL_RXH(ieee80211_rx_h_check_more_data)
49461622
JB		 1935 CALL_RXH(ieee80211_rx_h_sta_process)
1936 CALL_RXH(ieee80211_rx_h_defragment)
1937 CALL_RXH(ieee80211_rx_h_ps_poll)
1938 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1939 /* must be after MMIC verify so header is counted in MPDU mic */
1940 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1941 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 1942#ifdef CONFIG_MAC80211_MESH
e32f85f7
LCC		 1943 if (ieee80211_vif_is_mesh(&sdata->vif))
1944 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 1945#endif
49461622
JB		 1946 CALL_RXH(ieee80211_rx_h_data)
1947 CALL_RXH(ieee80211_rx_h_ctrl)
de1ede7a 1948 CALL_RXH(ieee80211_rx_h_action)
49461622
JB		 1949 CALL_RXH(ieee80211_rx_h_mgmt)
1950
1951#undef CALL_RXH
1952
1953 rxh_done:
58905290
JB		 1954 switch (res) {
1955 case RX_DROP_MONITOR:
49461622
JB		 1956 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1957 if (rx->sta)
1958 rx->sta->rx_dropped++;
1959 /* fall through */
1960 case RX_CONTINUE:
3d30d949
MW		 1961 ieee80211_rx_cooked_monitor(rx);
1962 break;
58905290 1963 case RX_DROP_UNUSABLE:
49461622
JB		 1964 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1965 if (rx->sta)
1966 rx->sta->rx_dropped++;
58905290
JB		 1967 dev_kfree_skb(rx->skb);
1968 break;
49461622
JB		 1969 case RX_QUEUED:
1970 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1971 break;
58905290
JB		 1972 }
1973}
1974
571ecf67
JB		 1975/* main receive path */
1976
23a24def 1977static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
7ab17c45 1978 struct ieee80211_rx_data *rx,
23a24def
JB		 1979 struct ieee80211_hdr *hdr)
1980{
7ab17c45 1981 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
23a24def
JB		 1982 int multicast = is_multicast_ether_addr(hdr->addr1);
1983
51fb61e7 1984 switch (sdata->vif.type) {
05c914fe 1985 case NL80211_IFTYPE_STATION:
23a24def
JB		 1986 if (!bssid)
1987 return 0;
77fdaa12
JB		 1988 if (!multicast &&
1989 compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) {
4150c572 1990 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 1991 return 0;
5cf121c3 1992 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 1993 }
1994 break;
05c914fe 1995 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 1996 if (!bssid)
1997 return 0;
a7767f95 1998 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 1999 return 1;
87291c02 2000 }
46900298 2001 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
5cf121c3 2002 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 2003 return 0;
5cf121c3 2004 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2005 } else if (!multicast &&
2006 compare_ether_addr(sdata->dev->dev_addr,
2007 hdr->addr1) != 0) {
4150c572 2008 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2009 return 0;
5cf121c3 2010 rx->flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2011 } else if (!rx->sta) {
2012 int rate_idx;
2013 if (rx->status->flag & RX_FLAG_HT)
2014 rate_idx = 0; /* TODO: HT rates */
2015 else
2016 rate_idx = rx->status->rate_idx;
ab1f5c0b 2017 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
0fb8ca45
JM		 2018 BIT(rate_idx));
2019 }
23a24def 2020 break;
05c914fe 2021 case NL80211_IFTYPE_MESH_POINT:
6032f934
JB		 2022 if (!multicast &&
2023 compare_ether_addr(sdata->dev->dev_addr,
2024 hdr->addr1) != 0) {
2025 if (!(sdata->dev->flags & IFF_PROMISC))
2026 return 0;
2027
5cf121c3 2028 rx->flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2029 }
2030 break;
05c914fe
JB		 2031 case NL80211_IFTYPE_AP_VLAN:
2032 case NL80211_IFTYPE_AP:
23a24def
JB		 2033 if (!bssid) {
2034 if (compare_ether_addr(sdata->dev->dev_addr,
2035 hdr->addr1))
2036 return 0;
2037 } else if (!ieee80211_bssid_match(bssid,
2038 sdata->dev->dev_addr)) {
5cf121c3 2039 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 2040 return 0;
5cf121c3 2041 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2042 }
23a24def 2043 break;
05c914fe 2044 case NL80211_IFTYPE_WDS:
a7767f95 2045 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2046 return 0;
2047 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2048 return 0;
2049 break;
05c914fe 2050 case NL80211_IFTYPE_MONITOR:
fb1c1cd6
JB		 2051 /* take everything */
2052 break;
05c914fe
JB		 2053 case NL80211_IFTYPE_UNSPECIFIED:
2054 case __NL80211_IFTYPE_AFTER_LAST:
fb1c1cd6
JB		 2055 /* should never get here */
2056 WARN_ON(1);
2057 break;
23a24def
JB		 2058 }
2059
2060 return 1;
2061}
2062
571ecf67 2063/*
6368e4b1
RR		 2064 * This is the actual Rx frames handler. as it blongs to Rx path it must
2065 * be called with rcu_read_lock protection.
571ecf67 2066 */
71ebb4aa
RR		 2067static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2068 struct sk_buff *skb,
8318d78a 2069 struct ieee80211_rate *rate)
571ecf67 2070{
f1d58c25 2071 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2072 struct ieee80211_local *local = hw_to_local(hw);
2073 struct ieee80211_sub_if_data *sdata;
571ecf67 2074 struct ieee80211_hdr *hdr;
5cf121c3 2075 struct ieee80211_rx_data rx;
6368e4b1 2076 int prepares;
8e6f0032
JB		 2077 struct ieee80211_sub_if_data *prev = NULL;
2078 struct sk_buff *skb_new;
571ecf67 2079
358c8d9d 2080 hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 2081 memset(&rx, 0, sizeof(rx));
2082 rx.skb = skb;
2083 rx.local = local;
2084
5cf121c3 2085 rx.status = status;
5cf121c3 2086 rx.rate = rate;
72abd81b 2087
358c8d9d 2088 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
571ecf67 2089 local->dot11ReceivedFragmentCount++;
571ecf67 2090
8944b79f
JB		 2091 rx.sta = sta_info_get(local, hdr->addr2);
2092 if (rx.sta) {
d0709a65
JB		 2093 rx.sdata = rx.sta->sdata;
2094 rx.dev = rx.sta->sdata->dev;
b2e7771e 2095 }
571ecf67 2096
571ecf67 2097 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
3b8d81e0 2098 ieee80211_rx_michael_mic_report(hdr, &rx);
d0709a65 2099 return;
571ecf67
JB		 2100 }
2101
142b9f50
HS		 2102 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2103 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
5cf121c3 2104 rx.flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2105
38f3714d 2106 ieee80211_parse_qos(&rx);
d1c3a37c 2107 ieee80211_verify_alignment(&rx);
38f3714d 2108
571ecf67
JB		 2109 skb = rx.skb;
2110
fbc44bf7
JB		 2111 if (rx.sdata && ieee80211_is_data(hdr->frame_control)) {
2112 rx.flags |= IEEE80211_RX_RA_MATCH;
2113 prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
2114 if (prepares)
2115 prev = rx.sdata;
2116 } else list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2a8a9a88
JB		 2117 if (!netif_running(sdata->dev))
2118 continue;
2119
fbc44bf7
JB		 2120 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2121 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
b2e7771e
JB		 2122 continue;
2123
5cf121c3 2124 rx.flags |= IEEE80211_RX_RA_MATCH;
7ab17c45 2125 prepares = prepare_for_handlers(sdata, &rx, hdr);
23a24def 2126
6368e4b1 2127 if (!prepares)
23a24def 2128 continue;
8e6f0032 2129
340e11f3
JB		 2130 /*
2131 * frame is destined for this interface, but if it's not
2132 * also for the previous one we handle that after the
2133 * loop to avoid copying the SKB once too much
2134 */
2135
2136 if (!prev) {
2137 prev = sdata;
2138 continue;
8e6f0032 2139 }
340e11f3
JB		 2140
2141 /*
2142 * frame was destined for the previous interface
2143 * so invoke RX handlers for it
2144 */
2145
2146 skb_new = skb_copy(skb, GFP_ATOMIC);
2147 if (!skb_new) {
2148 if (net_ratelimit())
2149 printk(KERN_DEBUG "%s: failed to copy "
a4278e18 2150 "multicast frame for %s\n",
dd1cd4c6
JB		 2151 wiphy_name(local->hw.wiphy),
2152 prev->dev->name);
340e11f3
JB		 2153 continue;
2154 }
8944b79f 2155 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
8e6f0032 2156 prev = sdata;
571ecf67 2157 }
a4b7d7bd 2158 if (prev)
8944b79f 2159 ieee80211_invoke_rx_handlers(prev, &rx, skb);
a4b7d7bd 2160 else
8e6f0032 2161 dev_kfree_skb(skb);
571ecf67 2162}
6368e4b1 2163
b580781e
RR		 2164#define SEQ_MODULO 0x1000
2165#define SEQ_MASK 0xfff
2166
2167static inline int seq_less(u16 sq1, u16 sq2)
2168{
c6a1fa12 2169 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
b580781e
RR		 2170}
2171
2172static inline u16 seq_inc(u16 sq)
2173{
c6a1fa12 2174 return (sq + 1) & SEQ_MASK;
b580781e
RR		 2175}
2176
2177static inline u16 seq_sub(u16 sq1, u16 sq2)
2178{
c6a1fa12 2179 return (sq1 - sq2) & SEQ_MASK;
b580781e
RR		 2180}
2181
2182
2d3babd1
JM		 2183static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
2184 struct tid_ampdu_rx *tid_agg_rx,
2185 int index)
2186{
2187 struct ieee80211_supported_band *sband;
2188 struct ieee80211_rate *rate;
f1d58c25
JB		 2189 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
2190 struct ieee80211_rx_status *status;
2d3babd1 2191
f1d58c25 2192 if (!skb)
2d3babd1
JM		 2193 goto no_frame;
2194
f1d58c25
JB		 2195 status = IEEE80211_SKB_RXCB(skb);
2196
2d3babd1 2197 /* release the reordered frames to stack */
f1d58c25
JB		 2198 sband = hw->wiphy->bands[status->band];
2199 if (status->flag & RX_FLAG_HT)
2d3babd1
JM		 2200 rate = sband->bitrates; /* TODO: HT rates */
2201 else
f1d58c25
JB		 2202 rate = &sband->bitrates[status->rate_idx];
2203 __ieee80211_rx_handle_packet(hw, skb, rate);
2d3babd1
JM		 2204 tid_agg_rx->stored_mpdu_num--;
2205 tid_agg_rx->reorder_buf[index] = NULL;
2206
2207no_frame:
2208 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2209}
2210
2211
4d050f1d
JM		 2212/*
2213 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2214 * the skb was added to the buffer longer than this time ago, the earlier
2215 * frames that have not yet been received are assumed to be lost and the skb
2216 * can be released for processing. This may also release other skb's from the
2217 * reorder buffer if there are no additional gaps between the frames.
2218 */
2219#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2220
71364716
RR		 2221/*
2222 * As it function blongs to Rx path it must be called with
2223 * the proper rcu_read_lock protection for its flow.
2224 */
c6a1fa12
JB		 2225static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2226 struct tid_ampdu_rx *tid_agg_rx,
2227 struct sk_buff *skb,
2228 u16 mpdu_seq_num,
2229 int bar_req)
b580781e 2230{
b580781e
RR		 2231 u16 head_seq_num, buf_size;
2232 int index;
b580781e
RR		 2233
2234 buf_size = tid_agg_rx->buf_size;
2235 head_seq_num = tid_agg_rx->head_seq_num;
2236
2237 /* frame with out of date sequence number */
2238 if (seq_less(mpdu_seq_num, head_seq_num)) {
2239 dev_kfree_skb(skb);
2240 return 1;
2241 }
2242
2243 /* if frame sequence number exceeds our buffering window size or
2244 * block Ack Request arrived - release stored frames */
2245 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2246 /* new head to the ordering buffer */
2247 if (bar_req)
2248 head_seq_num = mpdu_seq_num;
2249 else
2250 head_seq_num =
2251 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2252 /* release stored frames up to new head to stack */
2253 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2254 index = seq_sub(tid_agg_rx->head_seq_num,
2255 tid_agg_rx->ssn)
2256 % tid_agg_rx->buf_size;
2d3babd1
JM		 2257 ieee80211_release_reorder_frame(hw, tid_agg_rx,
2258 index);
b580781e
RR		 2259 }
2260 if (bar_req)
2261 return 1;
2262 }
2263
2264 /* now the new frame is always in the range of the reordering */
2265 /* buffer window */
2266 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2267 % tid_agg_rx->buf_size;
2268 /* check if we already stored this frame */
2269 if (tid_agg_rx->reorder_buf[index]) {
2270 dev_kfree_skb(skb);
2271 return 1;
2272 }
2273
2274 /* if arrived mpdu is in the right order and nothing else stored */
2275 /* release it immediately */
2276 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2277 tid_agg_rx->stored_mpdu_num == 0) {
2278 tid_agg_rx->head_seq_num =
2279 seq_inc(tid_agg_rx->head_seq_num);
2280 return 0;
2281 }
2282
2283 /* put the frame in the reordering buffer */
2284 tid_agg_rx->reorder_buf[index] = skb;
4d050f1d 2285 tid_agg_rx->reorder_time[index] = jiffies;
b580781e
RR		 2286 tid_agg_rx->stored_mpdu_num++;
2287 /* release the buffer until next missing frame */
2288 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2289 % tid_agg_rx->buf_size;
4d050f1d
JM		 2290 if (!tid_agg_rx->reorder_buf[index] &&
2291 tid_agg_rx->stored_mpdu_num > 1) {
2292 /*
2293 * No buffers ready to be released, but check whether any
2294 * frames in the reorder buffer have timed out.
2295 */
2296 int j;
2297 int skipped = 1;
2298 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
2299 j = (j + 1) % tid_agg_rx->buf_size) {
2300 if (tid_agg_rx->reorder_buf[j] == NULL) {
2301 skipped++;
2302 continue;
2303 }
2304 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
2305 HZ / 10))
2306 break;
2307
2308#ifdef CONFIG_MAC80211_HT_DEBUG
2309 if (net_ratelimit())
2310 printk(KERN_DEBUG "%s: release an RX reorder "
2311 "frame due to timeout on earlier "
2312 "frames\n",
2313 wiphy_name(hw->wiphy));
2314#endif
2315 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
2316
2317 /*
2318 * Increment the head seq# also for the skipped slots.
2319 */
2320 tid_agg_rx->head_seq_num =
2321 (tid_agg_rx->head_seq_num + skipped) &
2322 SEQ_MASK;
2323 skipped = 0;
2324 }
2325 } else while (tid_agg_rx->reorder_buf[index]) {
2d3babd1 2326 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
b580781e
RR		 2327 index = seq_sub(tid_agg_rx->head_seq_num,
2328 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2329 }
2330 return 1;
2331}
2332
71ebb4aa 2333static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
f1d58c25 2334 struct sk_buff *skb)
b580781e
RR		 2335{
2336 struct ieee80211_hw *hw = &local->hw;
2337 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2338 struct sta_info *sta;
2339 struct tid_ampdu_rx *tid_agg_rx;
87228f57 2340 u16 sc;
b580781e 2341 u16 mpdu_seq_num;
182503ab 2342 u8 ret = 0;
b580781e
RR		 2343 int tid;
2344
2345 sta = sta_info_get(local, hdr->addr2);
2346 if (!sta)
2347 return ret;
2348
b580781e
RR		 2349 /* filter the QoS data rx stream according to
2350 * STA/TID and check if this STA/TID is on aggregation */
87228f57 2351 if (!ieee80211_is_data_qos(hdr->frame_control))
b580781e
RR		 2352 goto end_reorder;
2353
238f74a2 2354 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
b580781e 2355
cee24a3e 2356 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
b580781e
RR		 2357 goto end_reorder;
2358
cee24a3e
RR		 2359 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2360
2560b6e2
EG		 2361 /* qos null data frames are excluded */
2362 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
b580781e
RR		 2363 goto end_reorder;
2364
2365 /* new un-ordered ampdu frame - process it */
2366
2367 /* reset session timer */
20ad19d0
JB		 2368 if (tid_agg_rx->timeout)
2369 mod_timer(&tid_agg_rx->session_timer,
2370 TU_TO_EXP_TIME(tid_agg_rx->timeout));
b580781e
RR		 2371
2372 /* if this mpdu is fragmented - terminate rx aggregation session */
2373 sc = le16_to_cpu(hdr->seq_ctrl);
2374 if (sc & IEEE80211_SCTL_FRAG) {
17741cdc 2375 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
b580781e
RR		 2376 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2377 ret = 1;
2378 goto end_reorder;
2379 }
2380
2381 /* according to mpdu sequence number deal with reordering buffer */
2382 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
f1d58c25 2383 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
b580781e 2384 mpdu_seq_num, 0);
d0709a65 2385 end_reorder:
b580781e
RR		 2386 return ret;
2387}
2388
6368e4b1
RR		 2389/*
2390 * This is the receive path handler. It is called by a low level driver when an
2391 * 802.11 MPDU is received from the hardware.
2392 */
103bf9f7 2393void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2394{
2395 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2396 struct ieee80211_rate *rate = NULL;
2397 struct ieee80211_supported_band *sband;
f1d58c25 2398 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2399
d20ef63d
JB		 2400 WARN_ON_ONCE(softirq_count() == 0);
2401
77a980dc
JB		 2402 if (WARN_ON(status->band < 0 ||
2403 status->band >= IEEE80211_NUM_BANDS))
2404 goto drop;
8318d78a
JB		 2405
2406 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2407 if (WARN_ON(!sband))
2408 goto drop;
8318d78a 2409
89c3a8ac
JB		 2410 /*
2411 * If we're suspending, it is possible although not too likely
2412 * that we'd be receiving frames after having already partially
2413 * quiesced the stack. We can't process such frames then since
2414 * that might, for example, cause stations to be added or other
2415 * driver callbacks be invoked.
2416 */
77a980dc
JB		 2417 if (unlikely(local->quiescing || local->suspended))
2418 goto drop;
89c3a8ac 2419
ea77f12f
JB		 2420 /*
2421 * The same happens when we're not even started,
2422 * but that's worth a warning.
2423 */
77a980dc
JB		 2424 if (WARN_ON(!local->started))
2425 goto drop;
ea77f12f 2426
0fb8ca45
JM		 2427 if (status->flag & RX_FLAG_HT) {
2428 /* rate_idx is MCS index */
2429 if (WARN_ON(status->rate_idx < 0 ||
2430 status->rate_idx >= 76))
77a980dc 2431 goto drop;
0fb8ca45
JM		 2432 /* HT rates are not in the table - use the highest legacy rate
2433 * for now since other parts of mac80211 may not yet be fully
2434 * MCS aware. */
2435 rate = &sband->bitrates[sband->n_bitrates - 1];
2436 } else {
2437 if (WARN_ON(status->rate_idx < 0 ||
2438 status->rate_idx >= sband->n_bitrates))
77a980dc 2439 goto drop;
0fb8ca45
JM		 2440 rate = &sband->bitrates[status->rate_idx];
2441 }
6368e4b1
RR		 2442
2443 /*
2444 * key references and virtual interfaces are protected using RCU
2445 * and this requires that we are in a read-side RCU section during
2446 * receive processing
2447 */
2448 rcu_read_lock();
2449
2450 /*
2451 * Frames with failed FCS/PLCP checksum are not returned,
2452 * all other frames are returned without radiotap header
2453 * if it was previously present.
2454 * Also, frames with less than 16 bytes are dropped.
2455 */
f1d58c25 2456 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2457 if (!skb) {
2458 rcu_read_unlock();
2459 return;
2460 }
2461
aec67952
JM		 2462 /*
2463 * In theory, the block ack reordering should happen after duplicate
2464 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2465 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2466 * happen as a new RX handler between ieee80211_rx_h_check and
2467 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2468 * the time being, the call can be here since RX reorder buf processing
2469 * will implicitly skip duplicates. We could, in theory at least,
2470 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2471 * frames from other than operational channel), but that should not
2472 * happen in normal networks.
2473 */
f1d58c25
JB		 2474 if (!ieee80211_rx_reorder_ampdu(local, skb))
2475 __ieee80211_rx_handle_packet(hw, skb, rate);
6368e4b1
RR		 2476
2477 rcu_read_unlock();
77a980dc
JB		 2478
2479 return;
2480 drop:
2481 kfree_skb(skb);
6368e4b1 2482}
103bf9f7 2483EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 2484
2485/* This is a version of the rx handler that can be called from hard irq
2486 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2487void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2488{
2489 struct ieee80211_local *local = hw_to_local(hw);
2490
2491 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2492
571ecf67
JB		 2493 skb->pkt_type = IEEE80211_RX_MSG;
2494 skb_queue_tail(&local->skb_queue, skb);
2495 tasklet_schedule(&local->tasklet);
2496}
2497EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)