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mac80211: restrict aggregation to supported interface modes
[mirror_ubuntu-jammy-kernel.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"
2c8dccc7 22#include "led.h"
33b64eb2 23#include "mesh.h"
571ecf67
JB		 24#include "wep.h"
25#include "wpa.h"
26#include "tkip.h"
27#include "wme.h"
28
c6a1fa12
JB		 29static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
30 struct tid_ampdu_rx *tid_agg_rx,
31 struct sk_buff *skb,
32 u16 mpdu_seq_num,
33 int bar_req);
b2e7771e
JB		 34/*
35 * monitor mode reception
36 *
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
39 */
40static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
41 struct sk_buff *skb,
42 int rtap_len)
43{
44 skb_pull(skb, rtap_len);
45
46 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
47 if (likely(skb->len > FCS_LEN))
48 skb_trim(skb, skb->len - FCS_LEN);
49 else {
50 /* driver bug */
51 WARN_ON(1);
52 dev_kfree_skb(skb);
53 skb = NULL;
54 }
55 }
56
57 return skb;
58}
59
60static inline int should_drop_frame(struct ieee80211_rx_status *status,
61 struct sk_buff *skb,
62 int present_fcs_len,
63 int radiotap_len)
64{
182503ab 65 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 66
67 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
68 return 1;
69 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
70 return 1;
87228f57
HH		 71 if (ieee80211_is_ctl(hdr->frame_control) &&
72 !ieee80211_is_pspoll(hdr->frame_control) &&
73 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 74 return 1;
75 return 0;
76}
77
601ae7f2
BR		 78static int
79ieee80211_rx_radiotap_len(struct ieee80211_local *local,
80 struct ieee80211_rx_status *status)
81{
82 int len;
83
84 /* always present fields */
85 len = sizeof(struct ieee80211_radiotap_header) + 9;
86
87 if (status->flag & RX_FLAG_TSFT)
88 len += 8;
7fee5372 89 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2
BR		 90 len += 1;
91 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
92 len += 1;
93
94 if (len & 1) /* padding for RX_FLAGS if necessary */
95 len++;
96
97 /* make sure radiotap starts at a naturally aligned address */
98 if (len % 8)
99 len = roundup(len, 8);
100
101 return len;
102}
103
d1c3a37c 104/*
601ae7f2
BR		 105 * ieee80211_add_rx_radiotap_header - add radiotap header
106 *
107 * add a radiotap header containing all the fields which the hardware provided.
108 */
109static void
110ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
111 struct sk_buff *skb,
112 struct ieee80211_rx_status *status,
113 struct ieee80211_rate *rate,
114 int rtap_len)
115{
116 struct ieee80211_radiotap_header *rthdr;
117 unsigned char *pos;
118
119 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
120 memset(rthdr, 0, rtap_len);
121
122 /* radiotap header, set always present flags */
123 rthdr->it_present =
124 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 125 (1 << IEEE80211_RADIOTAP_CHANNEL) |
126 (1 << IEEE80211_RADIOTAP_ANTENNA) |
127 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
128 rthdr->it_len = cpu_to_le16(rtap_len);
129
130 pos = (unsigned char *)(rthdr+1);
131
132 /* the order of the following fields is important */
133
134 /* IEEE80211_RADIOTAP_TSFT */
135 if (status->flag & RX_FLAG_TSFT) {
136 *(__le64 *)pos = cpu_to_le64(status->mactime);
137 rthdr->it_present |=
138 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
139 pos += 8;
140 }
141
142 /* IEEE80211_RADIOTAP_FLAGS */
143 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
144 *pos |= IEEE80211_RADIOTAP_F_FCS;
b4f28bbb
BR		 145 if (status->flag & RX_FLAG_SHORTPRE)
146 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 147 pos++;
148
149 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 150 if (status->flag & RX_FLAG_HT) {
151 /*
152 * TODO: add following information into radiotap header once
153 * suitable fields are defined for it:
154 * - MCS index (status->rate_idx)
155 * - HT40 (status->flag & RX_FLAG_40MHZ)
156 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
157 */
158 *pos = 0;
8d6f658e 159 } else {
ebe6c7ba 160 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 161 *pos = rate->bitrate / 5;
8d6f658e 162 }
601ae7f2
BR		 163 pos++;
164
165 /* IEEE80211_RADIOTAP_CHANNEL */
166 *(__le16 *)pos = cpu_to_le16(status->freq);
167 pos += 2;
168 if (status->band == IEEE80211_BAND_5GHZ)
169 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
170 IEEE80211_CHAN_5GHZ);
9deb1ae5
BR		 171 else if (rate->flags & IEEE80211_RATE_ERP_G)
172 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
173 IEEE80211_CHAN_2GHZ);
601ae7f2 174 else
9deb1ae5 175 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
601ae7f2
BR		 176 IEEE80211_CHAN_2GHZ);
177 pos += 2;
178
179 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
180 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
181 *pos = status->signal;
182 rthdr->it_present |=
183 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
184 pos++;
185 }
186
187 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
188 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
189 *pos = status->noise;
190 rthdr->it_present |=
191 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
192 pos++;
193 }
194
195 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
196
197 /* IEEE80211_RADIOTAP_ANTENNA */
198 *pos = status->antenna;
199 pos++;
200
601ae7f2
BR		 201 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
202
203 /* IEEE80211_RADIOTAP_RX_FLAGS */
204 /* ensure 2 byte alignment for the 2 byte field as required */
205 if ((pos - (unsigned char *)rthdr) & 1)
206 pos++;
207 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
208 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
209 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
210 pos += 2;
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
JB		 220 struct ieee80211_rx_status *status,
221 struct ieee80211_rate *rate)
b2e7771e
JB		 222{
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;
228 int rtap_len = 0;
229
230 /*
231 * First, we may need to make a copy of the skb because
232 * (1) we need to modify it for radiotap (if not present), and
233 * (2) the other RX handlers will modify the skb we got.
234 *
235 * We don't need to, of course, if we aren't going to return
236 * the SKB because it has a bad FCS/PLCP checksum.
237 */
238 if (status->flag & RX_FLAG_RADIOTAP)
239 rtap_len = ieee80211_get_radiotap_len(origskb->data);
240 else
601ae7f2
BR		 241 /* room for the radiotap header based on driver features */
242 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 243
244 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
245 present_fcs_len = FCS_LEN;
246
247 if (!local->monitors) {
248 if (should_drop_frame(status, origskb, present_fcs_len,
249 rtap_len)) {
250 dev_kfree_skb(origskb);
251 return NULL;
252 }
253
254 return remove_monitor_info(local, origskb, rtap_len);
255 }
256
257 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
258 /* only need to expand headroom if necessary */
259 skb = origskb;
260 origskb = NULL;
261
262 /*
263 * This shouldn't trigger often because most devices have an
264 * RX header they pull before we get here, and that should
265 * be big enough for our radiotap information. We should
266 * probably export the length to drivers so that we can have
267 * them allocate enough headroom to start with.
268 */
269 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 270 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 271 dev_kfree_skb(skb);
272 return NULL;
273 }
274 } else {
275 /*
276 * Need to make a copy and possibly remove radiotap header
277 * and FCS from the original.
278 */
279 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
280
281 origskb = remove_monitor_info(local, origskb, rtap_len);
282
283 if (!skb)
284 return origskb;
285 }
286
287 /* if necessary, prepend radiotap information */
601ae7f2
BR		 288 if (!(status->flag & RX_FLAG_RADIOTAP))
289 ieee80211_add_rx_radiotap_header(local, skb, status, rate,
290 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) {
298 if (!netif_running(sdata->dev))
299 continue;
300
05c914fe 301 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 302 continue;
303
3d30d949
MW		 304 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
305 continue;
306
b2e7771e
JB		 307 if (prev_dev) {
308 skb2 = skb_clone(skb, GFP_ATOMIC);
309 if (skb2) {
310 skb2->dev = prev_dev;
311 netif_rx(skb2);
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;
322 netif_rx(skb);
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;
6e0d114d
JB		 333 int tid;
334
335 /* does the frame have a qos control field? */
238f74a2
HH		 336 if (ieee80211_is_data_qos(hdr->frame_control)) {
337 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 338 /* frame has qos control */
238f74a2
HH		 339 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
340 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
5cf121c3 341 rx->flags |= IEEE80211_RX_AMSDU;
fd4c7f2f 342 else
5cf121c3 343 rx->flags &= ~IEEE80211_RX_AMSDU;
6e0d114d 344 } else {
1411f9b5
JB		 345 /*
346 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
347 *
348 * Sequence numbers for management frames, QoS data
349 * frames with a broadcast/multicast address in the
350 * Address 1 field, and all non-QoS data frames sent
351 * by QoS STAs are assigned using an additional single
352 * modulo-4096 counter, [...]
353 *
354 * We also use that counter for non-QoS STAs.
355 */
356 tid = NUM_RX_DATA_QUEUES - 1;
6e0d114d 357 }
52865dfd 358
5cf121c3 359 rx->queue = tid;
6e0d114d
JB		 360 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
361 * For now, set skb->priority to 0 for other cases. */
362 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 363}
6e0d114d 364
d1c3a37c
JB		 365/**
366 * DOC: Packet alignment
367 *
368 * Drivers always need to pass packets that are aligned to two-byte boundaries
369 * to the stack.
370 *
371 * Additionally, should, if possible, align the payload data in a way that
372 * guarantees that the contained IP header is aligned to a four-byte
373 * boundary. In the case of regular frames, this simply means aligning the
374 * payload to a four-byte boundary (because either the IP header is directly
375 * contained, or IV/RFC1042 headers that have a length divisible by four are
376 * in front of it).
377 *
378 * With A-MSDU frames, however, the payload data address must yield two modulo
379 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
380 * push the IP header further back to a multiple of four again. Thankfully, the
381 * specs were sane enough this time around to require padding each A-MSDU
382 * subframe to a length that is a multiple of four.
383 *
384 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
385 * the payload is not supported, the driver is required to move the 802.11
386 * header to be directly in front of the payload in that case.
387 */
388static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 389{
a7767f95 390 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
38f3714d
JB		 391 int hdrlen;
392
d1c3a37c
JB		 393#ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
394 return;
395#endif
396
397 if (WARN_ONCE((unsigned long)rx->skb->data & 1,
398 "unaligned packet at 0x%p\n", rx->skb->data))
399 return;
400
a7767f95 401 if (!ieee80211_is_data_present(hdr->frame_control))
38f3714d
JB		 402 return;
403
a7767f95 404 hdrlen = ieee80211_hdrlen(hdr->frame_control);
5cf121c3 405 if (rx->flags & IEEE80211_RX_AMSDU)
38f3714d 406 hdrlen += ETH_HLEN;
d1c3a37c
JB		 407 WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3,
408 "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen);
6e0d114d
JB		 409}
410
6368e4b1 411
571ecf67
JB		 412/* rx handlers */
413
49461622 414static ieee80211_rx_result debug_noinline
5cf121c3 415ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 416{
417 struct ieee80211_local *local = rx->local;
418 struct sk_buff *skb = rx->skb;
419
c2b13452
JB		 420 if (unlikely(local->hw_scanning))
421 return ieee80211_scan_rx(rx->sdata, skb, rx->status);
ece8eddd 422
c2b13452 423 if (unlikely(local->sw_scanning)) {
ece8eddd 424 /* drop all the other packets during a software scan anyway */
c2b13452 425 if (ieee80211_scan_rx(rx->sdata, skb, rx->status)
9ae54c84 426 != RX_QUEUED)
ece8eddd 427 dev_kfree_skb(skb);
9ae54c84 428 return RX_QUEUED;
571ecf67
JB		 429 }
430
5cf121c3 431 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
571ecf67
JB		 432 /* scanning finished during invoking of handlers */
433 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
e4c26add 434 return RX_DROP_UNUSABLE;
571ecf67
JB		 435 }
436
9ae54c84 437 return RX_CONTINUE;
571ecf67
JB		 438}
439
3cfcf6ac
JM		 440
441static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
442{
443 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
444
445 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
446 return 0;
447
448 return ieee80211_is_robust_mgmt_frame(hdr);
449}
450
451
452static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
453{
454 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
455
456 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
457 return 0;
458
459 return ieee80211_is_robust_mgmt_frame(hdr);
460}
461
462
463/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
464static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
465{
466 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
467 struct ieee80211_mmie *mmie;
468
469 if (skb->len < 24 + sizeof(*mmie) ||
470 !is_multicast_ether_addr(hdr->da))
471 return -1;
472
473 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
474 return -1; /* not a robust management frame */
475
476 mmie = (struct ieee80211_mmie *)
477 (skb->data + skb->len - sizeof(*mmie));
478 if (mmie->element_id != WLAN_EID_MMIE ||
479 mmie->length != sizeof(*mmie) - 2)
480 return -1;
481
482 return le16_to_cpu(mmie->key_id);
483}
484
485
33b64eb2 486static ieee80211_rx_result
5cf121c3 487ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 488{
a7767f95
HH		 489 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
490 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
d6d1a5a7 491
a7767f95
HH		 492 if (ieee80211_is_data(hdr->frame_control)) {
493 if (!ieee80211_has_a4(hdr->frame_control))
33b64eb2
LCC		 494 return RX_DROP_MONITOR;
495 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
496 return RX_DROP_MONITOR;
497 }
498
499 /* If there is not an established peer link and this is not a peer link
500 * establisment frame, beacon or probe, drop the frame.
501 */
502
b4e08ea1 503 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
33b64eb2 504 struct ieee80211_mgmt *mgmt;
d6d1a5a7 505
a7767f95 506 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 507 return RX_DROP_MONITOR;
508
a7767f95 509 if (ieee80211_is_action(hdr->frame_control)) {
33b64eb2
LCC		 510 mgmt = (struct ieee80211_mgmt *)hdr;
511 if (mgmt->u.action.category != PLINK_CATEGORY)
512 return RX_DROP_MONITOR;
33b64eb2 513 return RX_CONTINUE;
33b64eb2
LCC		 514 }
515
a7767f95
HH		 516 if (ieee80211_is_probe_req(hdr->frame_control) ||
517 ieee80211_is_probe_resp(hdr->frame_control) ||
518 ieee80211_is_beacon(hdr->frame_control))
519 return RX_CONTINUE;
520
521 return RX_DROP_MONITOR;
522
523 }
524
525#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
526
527 if (ieee80211_is_data(hdr->frame_control) &&
528 is_multicast_ether_addr(hdr->addr1) &&
f698d856 529 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata))
33b64eb2 530 return RX_DROP_MONITOR;
902acc78 531#undef msh_h_get
d6d1a5a7 532
902acc78
JB		 533 return RX_CONTINUE;
534}
33b64eb2
LCC		 535
536
49461622 537static ieee80211_rx_result debug_noinline
5cf121c3 538ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 539{
a7767f95 540 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 541
542 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
543 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 544 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
5cf121c3 545 rx->sta->last_seq_ctrl[rx->queue] ==
571ecf67 546 hdr->seq_ctrl)) {
5cf121c3 547 if (rx->flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 548 rx->local->dot11FrameDuplicateCount++;
549 rx->sta->num_duplicates++;
550 }
e4c26add 551 return RX_DROP_MONITOR;
571ecf67 552 } else
5cf121c3 553 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
571ecf67
JB		 554 }
555
571ecf67
JB		 556 if (unlikely(rx->skb->len < 16)) {
557 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 558 return RX_DROP_MONITOR;
571ecf67
JB		 559 }
560
571ecf67
JB		 561 /* Drop disallowed frame classes based on STA auth/assoc state;
562 * IEEE 802.11, Chap 5.5.
563 *
ccd7b362
JB		 564 * mac80211 filters only based on association state, i.e. it drops
565 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 566 * deauth/disassoc frames when needed. In addition, hostapd is
567 * responsible for filtering on both auth and assoc states.
568 */
33b64eb2 569
902acc78 570 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 571 return ieee80211_rx_mesh_check(rx);
33b64eb2 572
a7767f95
HH		 573 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
574 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 575 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
07346f81 576 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
a7767f95
HH		 577 if ((!ieee80211_has_fromds(hdr->frame_control) &&
578 !ieee80211_has_tods(hdr->frame_control) &&
579 ieee80211_is_data(hdr->frame_control)) ||
580 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
571ecf67
JB		 581 /* Drop IBSS frames and frames for other hosts
582 * silently. */
e4c26add 583 return RX_DROP_MONITOR;
571ecf67
JB		 584 }
585
e4c26add 586 return RX_DROP_MONITOR;
571ecf67
JB		 587 }
588
9ae54c84 589 return RX_CONTINUE;
570bd537
JB		 590}
591
592
49461622 593static ieee80211_rx_result debug_noinline
5cf121c3 594ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 595{
a7767f95 596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
3017b80b
JB		 597 int keyidx;
598 int hdrlen;
e4c26add 599 ieee80211_rx_result result = RX_DROP_UNUSABLE;
d4e46a3d 600 struct ieee80211_key *stakey = NULL;
3cfcf6ac 601 int mmie_keyidx = -1;
570bd537 602
3017b80b
JB		 603 /*
604 * Key selection 101
605 *
3cfcf6ac 606 * There are four types of keys:
3017b80b 607 * - GTK (group keys)
3cfcf6ac 608 * - IGTK (group keys for management frames)
3017b80b
JB		 609 * - PTK (pairwise keys)
610 * - STK (station-to-station pairwise keys)
611 *
612 * When selecting a key, we have to distinguish between multicast
613 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 614 * use PTKs and STKs while the former always use GTKs and IGTKs.
615 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
616 * unicast frames can also use key indices like GTKs. Hence, if we
617 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 618 *
8dc06a1c
JB		 619 * Note that in a regular BSS, multicast frames are sent by the
620 * AP only, associated stations unicast the frame to the AP first
621 * which then multicasts it on their behalf.
622 *
3017b80b
JB		 623 * There is also a slight problem in IBSS mode: GTKs are negotiated
624 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 625 * The spec seems to expect that one negotiates the same key with
626 * every station but there's no such requirement; VLANs could be
627 * possible.
3017b80b
JB		 628 */
629
3cfcf6ac
JM		 630 if (!ieee80211_has_protected(hdr->frame_control)) {
631 if (!ieee80211_is_mgmt(hdr->frame_control) ||
632 rx->sta == NULL || !test_sta_flags(rx->sta, WLAN_STA_MFP))
633 return RX_CONTINUE;
634 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
635 if (mmie_keyidx < 0)
636 return RX_CONTINUE;
637 }
571ecf67 638
3017b80b 639 /*
1990af8d 640 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 641 * addressed to us nor a multicast frame.
642 */
5cf121c3 643 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 644 return RX_CONTINUE;
3017b80b 645
d4e46a3d
JB		 646 if (rx->sta)
647 stakey = rcu_dereference(rx->sta->key);
648
649 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
650 rx->key = stakey;
3cfcf6ac
JM		 651 } else if (mmie_keyidx >= 0) {
652 /* Broadcast/multicast robust management frame / BIP */
653 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
654 (rx->status->flag & RX_FLAG_IV_STRIPPED))
655 return RX_CONTINUE;
656
657 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
658 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
659 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
660 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
571ecf67 661 } else {
3017b80b
JB		 662 /*
663 * The device doesn't give us the IV so we won't be
664 * able to look up the key. That's ok though, we
665 * don't need to decrypt the frame, we just won't
666 * be able to keep statistics accurate.
667 * Except for key threshold notifications, should
668 * we somehow allow the driver to tell us which key
669 * the hardware used if this flag is set?
670 */
5cf121c3
JB		 671 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
672 (rx->status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 673 return RX_CONTINUE;
3017b80b 674
a7767f95 675 hdrlen = ieee80211_hdrlen(hdr->frame_control);
3017b80b
JB		 676
677 if (rx->skb->len < 8 + hdrlen)
e4c26add 678 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 679
680 /*
681 * no need to call ieee80211_wep_get_keyidx,
682 * it verifies a bunch of things we've done already
683 */
684 keyidx = rx->skb->data[hdrlen + 3] >> 6;
685
d4e46a3d 686 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
3017b80b
JB		 687
688 /*
689 * RSNA-protected unicast frames should always be sent with
690 * pairwise or station-to-station keys, but for WEP we allow
691 * using a key index as well.
692 */
8f20fc24 693 if (rx->key && rx->key->conf.alg != ALG_WEP &&
3017b80b
JB		 694 !is_multicast_ether_addr(hdr->addr1))
695 rx->key = NULL;
571ecf67
JB		 696 }
697
3017b80b 698 if (rx->key) {
571ecf67 699 rx->key->tx_rx_count++;
011bfcc4 700 /* TODO: add threshold stuff again */
1990af8d 701 } else {
e4c26add 702 return RX_DROP_MONITOR;
70f08765
JB		 703 }
704
1990af8d
JB		 705 /* Check for weak IVs if possible */
706 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
a7767f95 707 ieee80211_is_data(hdr->frame_control) &&
5cf121c3
JB		 708 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
709 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
1990af8d
JB		 710 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
711 rx->sta->wep_weak_iv_count++;
712
70f08765
JB		 713 switch (rx->key->conf.alg) {
714 case ALG_WEP:
e2f036da
MN		 715 result = ieee80211_crypto_wep_decrypt(rx);
716 break;
70f08765 717 case ALG_TKIP:
e2f036da
MN		 718 result = ieee80211_crypto_tkip_decrypt(rx);
719 break;
70f08765 720 case ALG_CCMP:
e2f036da
MN		 721 result = ieee80211_crypto_ccmp_decrypt(rx);
722 break;
3cfcf6ac
JM		 723 case ALG_AES_CMAC:
724 result = ieee80211_crypto_aes_cmac_decrypt(rx);
725 break;
70f08765
JB		 726 }
727
e2f036da 728 /* either the frame has been decrypted or will be dropped */
5cf121c3 729 rx->status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 730
731 return result;
70f08765
JB		 732}
733
572e0012
KV		 734static ieee80211_rx_result debug_noinline
735ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
736{
737 struct ieee80211_local *local;
738 struct ieee80211_hdr *hdr;
739 struct sk_buff *skb;
740
741 local = rx->local;
742 skb = rx->skb;
743 hdr = (struct ieee80211_hdr *) skb->data;
744
745 if (!local->pspolling)
746 return RX_CONTINUE;
747
748 if (!ieee80211_has_fromds(hdr->frame_control))
749 /* this is not from AP */
750 return RX_CONTINUE;
751
752 if (!ieee80211_is_data(hdr->frame_control))
753 return RX_CONTINUE;
754
755 if (!ieee80211_has_moredata(hdr->frame_control)) {
756 /* AP has no more frames buffered for us */
757 local->pspolling = false;
758 return RX_CONTINUE;
759 }
760
761 /* more data bit is set, let's request a new frame from the AP */
762 ieee80211_send_pspoll(local, rx->sdata);
763
764 return RX_CONTINUE;
765}
766
133b8226 767static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 768{
133b8226 769 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 770 struct ieee80211_local *local = sdata->local;
0795af57 771
3e122be0 772 atomic_inc(&sdata->bss->num_sta_ps);
07346f81 773 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
89fad578
CL		 774 if (local->ops->sta_notify)
775 local->ops->sta_notify(local_to_hw(local), &sdata->vif,
776 STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 777#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26
JB		 778 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
779 sdata->dev->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 780#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
781}
782
133b8226 783static int ap_sta_ps_end(struct sta_info *sta)
571ecf67 784{
133b8226
JB		 785 struct ieee80211_sub_if_data *sdata = sta->sdata;
786 struct ieee80211_local *local = sdata->local;
571ecf67
JB		 787 struct sk_buff *skb;
788 int sent = 0;
571ecf67 789
3e122be0 790 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 791
07346f81 792 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
89fad578
CL		 793 if (local->ops->sta_notify)
794 local->ops->sta_notify(local_to_hw(local), &sdata->vif,
795 STA_NOTIFY_AWAKE, &sta->sta);
004c872e
JB		 796
797 if (!skb_queue_empty(&sta->ps_tx_buf))
798 sta_info_clear_tim_bit(sta);
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
571ecf67
JB		 805 /* Send all buffered frames to the station */
806 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
571ecf67 807 sent++;
8b30b1fe 808 skb->requeue = 1;
571ecf67
JB		 809 dev_queue_xmit(skb);
810 }
811 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
571ecf67
JB		 812 local->total_ps_buffered--;
813 sent++;
814#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 815 printk(KERN_DEBUG "%s: STA %pM aid %d send PS frame "
133b8226 816 "since STA not sleeping anymore\n", sdata->dev->name,
0c68ae26 817 sta->sta.addr, sta->sta.aid);
571ecf67 818#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
8b30b1fe 819 skb->requeue = 1;
571ecf67
JB		 820 dev_queue_xmit(skb);
821 }
822
823 return sent;
824}
825
49461622 826static ieee80211_rx_result debug_noinline
5cf121c3 827ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 828{
829 struct sta_info *sta = rx->sta;
a7767f95 830 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 831
832 if (!sta)
9ae54c84 833 return RX_CONTINUE;
571ecf67
JB		 834
835 /* Update last_rx only for IBSS packets which are for the current
836 * BSSID to avoid keeping the current IBSS network alive in cases where
837 * other STAs are using different BSSID. */
05c914fe 838 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 839 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 840 NL80211_IFTYPE_ADHOC);
571ecf67
JB		 841 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
842 sta->last_rx = jiffies;
843 } else
844 if (!is_multicast_ether_addr(hdr->addr1) ||
05c914fe 845 rx->sdata->vif.type == NL80211_IFTYPE_STATION) {
571ecf67
JB		 846 /* Update last_rx only for unicast frames in order to prevent
847 * the Probe Request frames (the only broadcast frames from a
848 * STA in infrastructure mode) from keeping a connection alive.
33b64eb2
LCC		 849 * Mesh beacons will update last_rx when if they are found to
850 * match the current local configuration when processed.
571ecf67
JB		 851 */
852 sta->last_rx = jiffies;
853 }
854
5cf121c3 855 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 856 return RX_CONTINUE;
571ecf67
JB		 857
858 sta->rx_fragments++;
859 sta->rx_bytes += rx->skb->len;
5cf121c3 860 sta->last_signal = rx->status->signal;
566bfe5a 861 sta->last_qual = rx->status->qual;
5cf121c3 862 sta->last_noise = rx->status->noise;
571ecf67 863
72eaa43a
JB		 864 /*
865 * Change STA power saving mode only at the end of a frame
866 * exchange sequence.
867 */
3e122be0 868 if (!ieee80211_has_morefrags(hdr->frame_control) &&
05c914fe
JB		 869 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
870 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
72eaa43a
JB		 871 if (test_sta_flags(sta, WLAN_STA_PS)) {
872 /*
873 * Ignore doze->wake transitions that are
874 * indicated by non-data frames, the standard
875 * is unclear here, but for example going to
876 * PS mode and then scanning would cause a
877 * doze->wake transition for the probe request,
878 * and that is clearly undesirable.
879 */
880 if (ieee80211_is_data(hdr->frame_control) &&
881 !ieee80211_has_pm(hdr->frame_control))
882 rx->sent_ps_buffered += ap_sta_ps_end(sta);
883 } else {
884 if (ieee80211_has_pm(hdr->frame_control))
885 ap_sta_ps_start(sta);
886 }
571ecf67
JB		 887 }
888
889 /* Drop data::nullfunc frames silently, since they are used only to
890 * control station power saving mode. */
a7767f95 891 if (ieee80211_is_nullfunc(hdr->frame_control)) {
571ecf67
JB		 892 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
893 /* Update counter and free packet here to avoid counting this
894 * as a dropped packed. */
895 sta->rx_packets++;
896 dev_kfree_skb(rx->skb);
9ae54c84 897 return RX_QUEUED;
571ecf67
JB		 898 }
899
9ae54c84 900 return RX_CONTINUE;
571ecf67
JB		 901} /* ieee80211_rx_h_sta_process */
902
571ecf67
JB		 903static inline struct ieee80211_fragment_entry *
904ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
905 unsigned int frag, unsigned int seq, int rx_queue,
906 struct sk_buff **skb)
907{
908 struct ieee80211_fragment_entry *entry;
909 int idx;
910
911 idx = sdata->fragment_next;
912 entry = &sdata->fragments[sdata->fragment_next++];
913 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
914 sdata->fragment_next = 0;
915
916 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 917#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 918 struct ieee80211_hdr *hdr =
919 (struct ieee80211_hdr *) entry->skb_list.next->data;
920 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
921 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 922 "addr1=%pM addr2=%pM\n",
571ecf67
JB		 923 sdata->dev->name, idx,
924 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 925 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 926#endif
571ecf67
JB		 927 __skb_queue_purge(&entry->skb_list);
928 }
929
930 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
931 *skb = NULL;
932 entry->first_frag_time = jiffies;
933 entry->seq = seq;
934 entry->rx_queue = rx_queue;
935 entry->last_frag = frag;
936 entry->ccmp = 0;
937 entry->extra_len = 0;
938
939 return entry;
940}
941
942static inline struct ieee80211_fragment_entry *
943ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 944 unsigned int frag, unsigned int seq,
571ecf67
JB		 945 int rx_queue, struct ieee80211_hdr *hdr)
946{
947 struct ieee80211_fragment_entry *entry;
948 int i, idx;
949
950 idx = sdata->fragment_next;
951 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
952 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 953
954 idx--;
955 if (idx < 0)
956 idx = IEEE80211_FRAGMENT_MAX - 1;
957
958 entry = &sdata->fragments[idx];
959 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
960 entry->rx_queue != rx_queue ||
961 entry->last_frag + 1 != frag)
962 continue;
963
b73d70ad 964 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 965
b73d70ad
HH		 966 /*
967 * Check ftype and addresses are equal, else check next fragment
968 */
969 if (((hdr->frame_control ^ f_hdr->frame_control) &
970 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 971 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
972 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
973 continue;
974
ab46623e 975 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 976 __skb_queue_purge(&entry->skb_list);
977 continue;
978 }
979 return entry;
980 }
981
982 return NULL;
983}
984
49461622 985static ieee80211_rx_result debug_noinline
5cf121c3 986ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 987{
988 struct ieee80211_hdr *hdr;
989 u16 sc;
358c8d9d 990 __le16 fc;
571ecf67
JB		 991 unsigned int frag, seq;
992 struct ieee80211_fragment_entry *entry;
993 struct sk_buff *skb;
994
b73d70ad 995 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 996 fc = hdr->frame_control;
571ecf67
JB		 997 sc = le16_to_cpu(hdr->seq_ctrl);
998 frag = sc & IEEE80211_SCTL_FRAG;
999
358c8d9d 1000 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1001 (rx->skb)->len < 24 ||
1002 is_multicast_ether_addr(hdr->addr1))) {
1003 /* not fragmented */
1004 goto out;
1005 }
1006 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1007
1008 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1009
1010 if (frag == 0) {
1011 /* This is the first fragment of a new frame. */
1012 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 1013 rx->queue, &(rx->skb));
8f20fc24 1014 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
358c8d9d 1015 ieee80211_has_protected(fc)) {
571ecf67
JB		 1016 /* Store CCMP PN so that we can verify that the next
1017 * fragment has a sequential PN value. */
1018 entry->ccmp = 1;
1019 memcpy(entry->last_pn,
5cf121c3 1020 rx->key->u.ccmp.rx_pn[rx->queue],
571ecf67
JB		 1021 CCMP_PN_LEN);
1022 }
9ae54c84 1023 return RX_QUEUED;
571ecf67
JB		 1024 }
1025
1026 /* This is a fragment for a frame that should already be pending in
1027 * fragment cache. Add this fragment to the end of the pending entry.
1028 */
b73d70ad 1029 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 1030 if (!entry) {
1031 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1032 return RX_DROP_MONITOR;
571ecf67
JB		 1033 }
1034
1035 /* Verify that MPDUs within one MSDU have sequential PN values.
1036 * (IEEE 802.11i, 8.3.3.4.5) */
1037 if (entry->ccmp) {
1038 int i;
1039 u8 pn[CCMP_PN_LEN], *rpn;
8f20fc24 1040 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
e4c26add 1041 return RX_DROP_UNUSABLE;
571ecf67
JB		 1042 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1043 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1044 pn[i]++;
1045 if (pn[i])
1046 break;
1047 }
5cf121c3 1048 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
f4ea83dd 1049 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1050 return RX_DROP_UNUSABLE;
571ecf67
JB		 1051 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1052 }
1053
358c8d9d 1054 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1055 __skb_queue_tail(&entry->skb_list, rx->skb);
1056 entry->last_frag = frag;
1057 entry->extra_len += rx->skb->len;
358c8d9d 1058 if (ieee80211_has_morefrags(fc)) {
571ecf67 1059 rx->skb = NULL;
9ae54c84 1060 return RX_QUEUED;
571ecf67
JB		 1061 }
1062
1063 rx->skb = __skb_dequeue(&entry->skb_list);
1064 if (skb_tailroom(rx->skb) < entry->extra_len) {
1065 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1066 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1067 GFP_ATOMIC))) {
1068 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1069 __skb_queue_purge(&entry->skb_list);
e4c26add 1070 return RX_DROP_UNUSABLE;
571ecf67
JB		 1071 }
1072 }
1073 while ((skb = __skb_dequeue(&entry->skb_list))) {
1074 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1075 dev_kfree_skb(skb);
1076 }
1077
1078 /* Complete frame has been reassembled - process it now */
5cf121c3 1079 rx->flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1080
1081 out:
1082 if (rx->sta)
1083 rx->sta->rx_packets++;
1084 if (is_multicast_ether_addr(hdr->addr1))
1085 rx->local->dot11MulticastReceivedFrameCount++;
1086 else
1087 ieee80211_led_rx(rx->local);
9ae54c84 1088 return RX_CONTINUE;
571ecf67
JB		 1089}
1090
49461622 1091static ieee80211_rx_result debug_noinline
5cf121c3 1092ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1093{
98f0b0a3 1094 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
571ecf67
JB		 1095 struct sk_buff *skb;
1096 int no_pending_pkts;
358c8d9d 1097 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
571ecf67 1098
358c8d9d 1099 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
5cf121c3 1100 !(rx->flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1101 return RX_CONTINUE;
571ecf67 1102
05c914fe
JB		 1103 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1104 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1105 return RX_DROP_UNUSABLE;
98f0b0a3 1106
571ecf67
JB		 1107 skb = skb_dequeue(&rx->sta->tx_filtered);
1108 if (!skb) {
1109 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1110 if (skb)
1111 rx->local->total_ps_buffered--;
1112 }
1113 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1114 skb_queue_empty(&rx->sta->ps_tx_buf);
1115
1116 if (skb) {
1117 struct ieee80211_hdr *hdr =
1118 (struct ieee80211_hdr *) skb->data;
1119
4a9a66e9
JB		 1120 /*
1121 * Tell TX path to send one frame even though the STA may
1122 * still remain is PS mode after this frame exchange.
1123 */
07346f81 1124 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67
JB		 1125
1126#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26
JB		 1127 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1128 rx->sta->sta.addr, rx->sta->sta.aid,
571ecf67
JB		 1129 skb_queue_len(&rx->sta->ps_tx_buf));
1130#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1131
1132 /* Use MoreData flag to indicate whether there are more
1133 * buffered frames for this STA */
836341a7 1134 if (no_pending_pkts)
571ecf67 1135 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
836341a7 1136 else
571ecf67
JB		 1137 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1138
1139 dev_queue_xmit(skb);
1140
004c872e
JB		 1141 if (no_pending_pkts)
1142 sta_info_clear_tim_bit(rx->sta);
571ecf67 1143#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
5cf121c3 1144 } else if (!rx->sent_ps_buffered) {
004c872e
JB		 1145 /*
1146 * FIXME: This can be the result of a race condition between
1147 * us expiring a frame and the station polling for it.
1148 * Should we send it a null-func frame indicating we
1149 * have nothing buffered for it?
1150 */
0c68ae26 1151 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
f4ea83dd 1152 "though there are no buffered frames for it\n",
0c68ae26 1153 rx->dev->name, rx->sta->sta.addr);
571ecf67 1154#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
571ecf67
JB		 1155 }
1156
9ae54c84 1157 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1158 * count as an dropped frame. */
1159 dev_kfree_skb(rx->skb);
1160
9ae54c84 1161 return RX_QUEUED;
571ecf67
JB		 1162}
1163
49461622 1164static ieee80211_rx_result debug_noinline
5cf121c3 1165ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1166{
6e0d114d 1167 u8 *data = rx->skb->data;
238f74a2 1168 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1169
238f74a2 1170 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1171 return RX_CONTINUE;
6e0d114d
JB		 1172
1173 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1174 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1175 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1176 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1177 /* change frame type to non QOS */
238f74a2 1178 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1179
9ae54c84 1180 return RX_CONTINUE;
6e0d114d
JB		 1181}
1182
76ee65bf 1183static int
5cf121c3 1184ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1185{
07346f81 1186 if (unlikely(!rx->sta ||
f4ea83dd 1187 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1188 return -EACCES;
571ecf67 1189
76ee65bf 1190 return 0;
571ecf67
JB		 1191}
1192
76ee65bf 1193static int
358c8d9d 1194ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1195{
3017b80b 1196 /*
7848ba7d
JB		 1197 * Pass through unencrypted frames if the hardware has
1198 * decrypted them already.
3017b80b 1199 */
5cf121c3 1200 if (rx->status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1201 return 0;
571ecf67
JB		 1202
1203 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1204 if (unlikely(!ieee80211_has_protected(fc) &&
1205 !ieee80211_is_nullfunc(fc) &&
3cfcf6ac
JM		 1206 (!ieee80211_is_mgmt(fc) ||
1207 (ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1208 rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP))) &&
1209 (rx->key || rx->sdata->drop_unencrypted)))
1210 return -EACCES;
1211 /* BIP does not use Protected field, so need to check MMIE */
1212 if (unlikely(rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP) &&
1213 ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1214 ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
b3fc9c6c 1215 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1216 return -EACCES;
b3fc9c6c 1217
76ee65bf 1218 return 0;
571ecf67
JB		 1219}
1220
76ee65bf 1221static int
5cf121c3 1222ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67
JB		 1223{
1224 struct net_device *dev = rx->dev;
571ecf67 1225 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
b73d70ad 1226 u16 hdrlen, ethertype;
571ecf67
JB		 1227 u8 *payload;
1228 u8 dst[ETH_ALEN];
c97c23e3 1229 u8 src[ETH_ALEN] __aligned(2);
76ee65bf 1230 struct sk_buff *skb = rx->skb;
571ecf67
JB		 1231 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1232
b73d70ad 1233 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
76ee65bf 1234 return -1;
571ecf67 1235
b73d70ad 1236 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 1237
1238 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1239 * header
1240 * IEEE 802.11 address fields:
1241 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1242 * 0 0 DA SA BSSID n/a
1243 * 0 1 DA BSSID SA n/a
1244 * 1 0 BSSID SA DA n/a
1245 * 1 1 RA TA DA SA
1246 */
b73d70ad
HH		 1247 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
1248 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
571ecf67 1249
b73d70ad
HH		 1250 switch (hdr->frame_control &
1251 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
c1b4aa3f 1252 case cpu_to_le16(IEEE80211_FCTL_TODS):
05c914fe
JB		 1253 if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP &&
1254 sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
76ee65bf 1255 return -1;
571ecf67 1256 break;
c1b4aa3f 1257 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
05c914fe
JB		 1258 if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS &&
1259 sdata->vif.type != NL80211_IFTYPE_MESH_POINT))
76ee65bf 1260 return -1;
79617dee
Y		 1261 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1262 struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *)
1263 (skb->data + hdrlen);
1264 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
1265 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
1266 memcpy(dst, meshdr->eaddr1, ETH_ALEN);
1267 memcpy(src, meshdr->eaddr2, ETH_ALEN);
1268 }
1269 }
571ecf67 1270 break;
c1b4aa3f 1271 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
05c914fe 1272 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
b3316157
JL		 1273 (is_multicast_ether_addr(dst) &&
1274 !compare_ether_addr(src, dev->dev_addr)))
76ee65bf 1275 return -1;
571ecf67 1276 break;
c1b4aa3f 1277 case cpu_to_le16(0):
05c914fe 1278 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
76ee65bf 1279 return -1;
571ecf67
JB		 1280 break;
1281 }
1282
f4ea83dd 1283 if (unlikely(skb->len - hdrlen < 8))
76ee65bf 1284 return -1;
571ecf67 1285
76ee65bf 1286 payload = skb->data + hdrlen;
571ecf67
JB		 1287 ethertype = (payload[6] << 8) | payload[7];
1288
1289 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1290 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1291 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1292 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1293 * replace EtherType */
1294 skb_pull(skb, hdrlen + 6);
1295 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1296 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1297 } else {
1298 struct ethhdr *ehdr;
1299 __be16 len;
ce3edf6d 1300
571ecf67
JB		 1301 skb_pull(skb, hdrlen);
1302 len = htons(skb->len);
1303 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1304 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1305 memcpy(ehdr->h_source, src, ETH_ALEN);
1306 ehdr->h_proto = len;
1307 }
76ee65bf
RR		 1308 return 0;
1309}
571ecf67 1310
ce3edf6d
JB		 1311/*
1312 * requires that rx->skb is a frame with ethernet header
1313 */
358c8d9d 1314static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1315{
c97c23e3 1316 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1317 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1318 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1319
1320 /*
1321 * Allow EAPOL frames to us/the PAE group address regardless
1322 * of whether the frame was encrypted or not.
1323 */
1324 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1325 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1326 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1327 return true;
1328
1329 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1330 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1331 return false;
1332
1333 return true;
1334}
1335
1336/*
1337 * requires that rx->skb is a frame with ethernet header
1338 */
76ee65bf 1339static void
5cf121c3 1340ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf
RR		 1341{
1342 struct net_device *dev = rx->dev;
1343 struct ieee80211_local *local = rx->local;
1344 struct sk_buff *skb, *xmit_skb;
1345 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ce3edf6d
JB		 1346 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1347 struct sta_info *dsta;
571ecf67 1348
76ee65bf
RR		 1349 skb = rx->skb;
1350 xmit_skb = NULL;
571ecf67 1351
05c914fe
JB		 1352 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1353 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1354 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
5cf121c3 1355 (rx->flags & IEEE80211_RX_RA_MATCH)) {
ce3edf6d
JB		 1356 if (is_multicast_ether_addr(ehdr->h_dest)) {
1357 /*
1358 * send multicast frames both to higher layers in
1359 * local net stack and back to the wireless medium
1360 */
76ee65bf
RR		 1361 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1362 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1363 printk(KERN_DEBUG "%s: failed to clone "
1364 "multicast frame\n", dev->name);
1365 } else {
571ecf67 1366 dsta = sta_info_get(local, skb->data);
d0709a65 1367 if (dsta && dsta->sdata->dev == dev) {
ce3edf6d
JB		 1368 /*
1369 * The destination station is associated to
1370 * this AP (in this VLAN), so send the frame
1371 * directly to it and do not pass it to local
1372 * net stack.
571ecf67 1373 */
76ee65bf 1374 xmit_skb = skb;
571ecf67
JB		 1375 skb = NULL;
1376 }
571ecf67
JB		 1377 }
1378 }
1379
1380 if (skb) {
d1c3a37c
JB		 1381 int align __maybe_unused;
1382
1383#if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1384 /*
1385 * 'align' will only take the values 0 or 2 here
1386 * since all frames are required to be aligned
1387 * to 2-byte boundaries when being passed to
1388 * mac80211. That also explains the __skb_push()
1389 * below.
1390 */
1391 align = (unsigned long)skb->data & 4;
1392 if (align) {
1393 if (WARN_ON(skb_headroom(skb) < 3)) {
1394 dev_kfree_skb(skb);
1395 skb = NULL;
1396 } else {
1397 u8 *data = skb->data;
1398 size_t len = skb->len;
1399 u8 *new = __skb_push(skb, align);
1400 memmove(new, data, len);
1401 __skb_trim(skb, len);
1402 }
1403 }
1404#endif
1405
1406 if (skb) {
1407 /* deliver to local stack */
1408 skb->protocol = eth_type_trans(skb, dev);
1409 memset(skb->cb, 0, sizeof(skb->cb));
1410 netif_rx(skb);
1411 }
571ecf67
JB		 1412 }
1413
76ee65bf 1414 if (xmit_skb) {
571ecf67 1415 /* send to wireless media */
f831e909 1416 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1417 skb_reset_network_header(xmit_skb);
1418 skb_reset_mac_header(xmit_skb);
76ee65bf 1419 dev_queue_xmit(xmit_skb);
571ecf67 1420 }
76ee65bf
RR		 1421}
1422
49461622 1423static ieee80211_rx_result debug_noinline
5cf121c3 1424ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f
RR		 1425{
1426 struct net_device *dev = rx->dev;
1427 struct ieee80211_local *local = rx->local;
358c8d9d 1428 u16 ethertype;
fd4c7f2f
RR		 1429 u8 *payload;
1430 struct sk_buff *skb = rx->skb, *frame = NULL;
358c8d9d
HH		 1431 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1432 __le16 fc = hdr->frame_control;
fd4c7f2f
RR		 1433 const struct ethhdr *eth;
1434 int remaining, err;
1435 u8 dst[ETH_ALEN];
1436 u8 src[ETH_ALEN];
fd4c7f2f 1437
358c8d9d 1438 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1439 return RX_CONTINUE;
fd4c7f2f 1440
358c8d9d 1441 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1442 return RX_DROP_MONITOR;
fd4c7f2f 1443
5cf121c3 1444 if (!(rx->flags & IEEE80211_RX_AMSDU))
9ae54c84 1445 return RX_CONTINUE;
fd4c7f2f
RR		 1446
1447 err = ieee80211_data_to_8023(rx);
1448 if (unlikely(err))
e4c26add 1449 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1450
1451 skb->dev = dev;
1452
1453 dev->stats.rx_packets++;
1454 dev->stats.rx_bytes += skb->len;
1455
1456 /* skip the wrapping header */
1457 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1458 if (!eth)
e4c26add 1459 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1460
1461 while (skb != frame) {
1462 u8 padding;
1463 __be16 len = eth->h_proto;
1464 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1465
1466 remaining = skb->len;
1467 memcpy(dst, eth->h_dest, ETH_ALEN);
1468 memcpy(src, eth->h_source, ETH_ALEN);
1469
1470 padding = ((4 - subframe_len) & 0x3);
1471 /* the last MSDU has no padding */
f4ea83dd 1472 if (subframe_len > remaining)
e4c26add 1473 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1474
1475 skb_pull(skb, sizeof(struct ethhdr));
1476 /* if last subframe reuse skb */
1477 if (remaining <= subframe_len + padding)
1478 frame = skb;
1479 else {
d1c3a37c
JB		 1480 /*
1481 * Allocate and reserve two bytes more for payload
1482 * alignment since sizeof(struct ethhdr) is 14.
1483 */
1484 frame = dev_alloc_skb(
1485 ALIGN(local->hw.extra_tx_headroom, 4) +
1486 subframe_len + 2);
fd4c7f2f
RR		 1487
1488 if (frame == NULL)
e4c26add 1489 return RX_DROP_UNUSABLE;
fd4c7f2f 1490
d1c3a37c
JB		 1491 skb_reserve(frame,
1492 ALIGN(local->hw.extra_tx_headroom, 4) +
1493 sizeof(struct ethhdr) + 2);
fd4c7f2f
RR		 1494 memcpy(skb_put(frame, ntohs(len)), skb->data,
1495 ntohs(len));
1496
1497 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1498 padding);
1499 if (!eth) {
fd4c7f2f 1500 dev_kfree_skb(frame);
e4c26add 1501 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1502 }
1503 }
1504
ce3edf6d 1505 skb_reset_network_header(frame);
fd4c7f2f
RR		 1506 frame->dev = dev;
1507 frame->priority = skb->priority;
1508 rx->skb = frame;
1509
fd4c7f2f
RR		 1510 payload = frame->data;
1511 ethertype = (payload[6] << 8) | payload[7];
1512
1513 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
ce3edf6d
JB		 1514 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1515 compare_ether_addr(payload,
1516 bridge_tunnel_header) == 0)) {
fd4c7f2f
RR		 1517 /* remove RFC1042 or Bridge-Tunnel
1518 * encapsulation and replace EtherType */
1519 skb_pull(frame, 6);
1520 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1521 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1522 } else {
ce3edf6d
JB		 1523 memcpy(skb_push(frame, sizeof(__be16)),
1524 &len, sizeof(__be16));
fd4c7f2f
RR		 1525 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1526 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1527 }
1528
358c8d9d 1529 if (!ieee80211_frame_allowed(rx, fc)) {
ce3edf6d 1530 if (skb == frame) /* last frame */
e4c26add 1531 return RX_DROP_UNUSABLE;
ce3edf6d
JB		 1532 dev_kfree_skb(frame);
1533 continue;
1534 }
fd4c7f2f
RR		 1535
1536 ieee80211_deliver_skb(rx);
1537 }
1538
9ae54c84 1539 return RX_QUEUED;
fd4c7f2f
RR		 1540}
1541
bf94e17b 1542#ifdef CONFIG_MAC80211_MESH
b0dee578 1543static ieee80211_rx_result
e32f85f7
LCC		 1544ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1545{
1546 struct ieee80211_hdr *hdr;
1547 struct ieee80211s_hdr *mesh_hdr;
1548 unsigned int hdrlen;
1549 struct sk_buff *skb = rx->skb, *fwd_skb;
1550
1551 hdr = (struct ieee80211_hdr *) skb->data;
1552 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1553 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1554
1555 if (!ieee80211_is_data(hdr->frame_control))
1556 return RX_CONTINUE;
1557
1558 if (!mesh_hdr->ttl)
1559 /* illegal frame */
1560 return RX_DROP_MONITOR;
1561
79617dee
Y		 1562 if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1563 struct ieee80211_sub_if_data *sdata;
1564 struct mesh_path *mppath;
1565
1566 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1567 rcu_read_lock();
1568 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1569 if (!mppath) {
1570 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1571 } else {
1572 spin_lock_bh(&mppath->state_lock);
1573 mppath->exp_time = jiffies;
1574 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1575 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1576 spin_unlock_bh(&mppath->state_lock);
1577 }
1578 rcu_read_unlock();
1579 }
1580
e32f85f7
LCC		 1581 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1582 return RX_CONTINUE;
1583
1584 mesh_hdr->ttl--;
1585
1586 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1587 if (!mesh_hdr->ttl)
472dbc45 1588 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1589 dropped_frames_ttl);
1590 else {
1591 struct ieee80211_hdr *fwd_hdr;
1592 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1593
1594 if (!fwd_skb && net_ratelimit())
1595 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1596 rx->dev->name);
1597
1598 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1599 /*
1600 * Save TA to addr1 to send TA a path error if a
1601 * suitable next hop is not found
1602 */
1603 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1604 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1605 fwd_skb->dev = rx->local->mdev;
1606 fwd_skb->iif = rx->dev->ifindex;
1607 dev_queue_xmit(fwd_skb);
1608 }
1609 }
1610
1611 if (is_multicast_ether_addr(hdr->addr3) ||
1612 rx->dev->flags & IFF_PROMISC)
1613 return RX_CONTINUE;
1614 else
1615 return RX_DROP_MONITOR;
1616}
bf94e17b 1617#endif
e32f85f7 1618
49461622 1619static ieee80211_rx_result debug_noinline
5cf121c3 1620ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf
RR		 1621{
1622 struct net_device *dev = rx->dev;
358c8d9d
HH		 1623 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1624 __le16 fc = hdr->frame_control;
ce3edf6d 1625 int err;
76ee65bf 1626
358c8d9d 1627 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1628 return RX_CONTINUE;
76ee65bf 1629
358c8d9d 1630 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1631 return RX_DROP_MONITOR;
76ee65bf 1632
76ee65bf
RR		 1633 err = ieee80211_data_to_8023(rx);
1634 if (unlikely(err))
e4c26add 1635 return RX_DROP_UNUSABLE;
76ee65bf 1636
358c8d9d 1637 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1638 return RX_DROP_MONITOR;
ce3edf6d 1639
76ee65bf
RR		 1640 rx->skb->dev = dev;
1641
1642 dev->stats.rx_packets++;
1643 dev->stats.rx_bytes += rx->skb->len;
1644
1645 ieee80211_deliver_skb(rx);
571ecf67 1646
9ae54c84 1647 return RX_QUEUED;
571ecf67
JB		 1648}
1649
49461622 1650static ieee80211_rx_result debug_noinline
5cf121c3 1651ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 1652{
1653 struct ieee80211_local *local = rx->local;
1654 struct ieee80211_hw *hw = &local->hw;
1655 struct sk_buff *skb = rx->skb;
a7767f95 1656 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1657 struct tid_ampdu_rx *tid_agg_rx;
1658 u16 start_seq_num;
1659 u16 tid;
1660
a7767f95 1661 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1662 return RX_CONTINUE;
71364716 1663
a7767f95 1664 if (ieee80211_is_back_req(bar->frame_control)) {
71364716 1665 if (!rx->sta)
9ae54c84 1666 return RX_CONTINUE;
71364716 1667 tid = le16_to_cpu(bar->control) >> 12;
cee24a3e
RR		 1668 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1669 != HT_AGG_STATE_OPERATIONAL)
9ae54c84 1670 return RX_CONTINUE;
cee24a3e 1671 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
71364716
RR		 1672
1673 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1674
1675 /* reset session timer */
20ad19d0
JB		 1676 if (tid_agg_rx->timeout)
1677 mod_timer(&tid_agg_rx->session_timer,
1678 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716
RR		 1679
1680 /* manage reordering buffer according to requested */
1681 /* sequence number */
1682 rcu_read_lock();
1683 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1684 start_seq_num, 1);
1685 rcu_read_unlock();
e4c26add 1686 return RX_DROP_UNUSABLE;
71364716
RR		 1687 }
1688
9ae54c84 1689 return RX_CONTINUE;
71364716
RR		 1690}
1691
f4f727a6
JM		 1692static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1693 struct ieee80211_mgmt *mgmt,
1694 size_t len)
fea14732
JM		 1695{
1696 struct ieee80211_local *local = sdata->local;
1697 struct sk_buff *skb;
1698 struct ieee80211_mgmt *resp;
1699
1700 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1701 /* Not to own unicast address */
1702 return;
1703 }
1704
1705 if (compare_ether_addr(mgmt->sa, sdata->u.sta.bssid) != 0 ||
1706 compare_ether_addr(mgmt->bssid, sdata->u.sta.bssid) != 0) {
1707 /* Not from the current AP. */
1708 return;
1709 }
1710
1711 if (sdata->u.sta.state == IEEE80211_STA_MLME_ASSOCIATE) {
1712 /* Association in progress; ignore SA Query */
1713 return;
1714 }
1715
1716 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1717 /* Too short SA Query request frame */
1718 return;
1719 }
1720
1721 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1722 if (skb == NULL)
1723 return;
1724
1725 skb_reserve(skb, local->hw.extra_tx_headroom);
1726 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1727 memset(resp, 0, 24);
1728 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1729 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
1730 memcpy(resp->bssid, sdata->u.sta.bssid, ETH_ALEN);
1731 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1732 IEEE80211_STYPE_ACTION);
1733 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1734 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1735 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1736 memcpy(resp->u.action.u.sa_query.trans_id,
1737 mgmt->u.action.u.sa_query.trans_id,
1738 WLAN_SA_QUERY_TR_ID_LEN);
1739
1740 ieee80211_tx_skb(sdata, skb, 1);
1741}
1742
de1ede7a
JB		 1743static ieee80211_rx_result debug_noinline
1744ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1745{
1746 struct ieee80211_local *local = rx->local;
1747 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
c481ec97 1748 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
de1ede7a 1749 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
c481ec97 1750 struct ieee80211_bss *bss;
de1ede7a
JB		 1751 int len = rx->skb->len;
1752
1753 if (!ieee80211_is_action(mgmt->frame_control))
1754 return RX_CONTINUE;
1755
1756 if (!rx->sta)
1757 return RX_DROP_MONITOR;
1758
1759 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1760 return RX_DROP_MONITOR;
1761
97ebe12a
JM		 1762 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1763 return RX_DROP_MONITOR;
1764
de1ede7a
JB		 1765 /* all categories we currently handle have action_code */
1766 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1767 return RX_DROP_MONITOR;
1768
de1ede7a
JB		 1769 switch (mgmt->u.action.category) {
1770 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 1771 /*
1772 * The aggregation code is not prepared to handle
1773 * anything but STA/AP due to the BSSID handling;
1774 * IBSS could work in the code but isn't supported
1775 * by drivers or the standard.
1776 */
1777 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1778 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1779 sdata->vif.type != NL80211_IFTYPE_AP)
1780 return RX_DROP_MONITOR;
1781
de1ede7a
JB		 1782 switch (mgmt->u.action.u.addba_req.action_code) {
1783 case WLAN_ACTION_ADDBA_REQ:
1784 if (len < (IEEE80211_MIN_ACTION_SIZE +
1785 sizeof(mgmt->u.action.u.addba_req)))
1786 return RX_DROP_MONITOR;
1787 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1788 break;
1789 case WLAN_ACTION_ADDBA_RESP:
1790 if (len < (IEEE80211_MIN_ACTION_SIZE +
1791 sizeof(mgmt->u.action.u.addba_resp)))
1792 return RX_DROP_MONITOR;
1793 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1794 break;
1795 case WLAN_ACTION_DELBA:
1796 if (len < (IEEE80211_MIN_ACTION_SIZE +
1797 sizeof(mgmt->u.action.u.delba)))
1798 return RX_DROP_MONITOR;
1799 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1800 break;
1801 }
39192c0b
JB		 1802 break;
1803 case WLAN_CATEGORY_SPECTRUM_MGMT:
1804 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1805 return RX_DROP_MONITOR;
1806 switch (mgmt->u.action.u.measurement.action_code) {
1807 case WLAN_ACTION_SPCT_MSR_REQ:
1808 if (len < (IEEE80211_MIN_ACTION_SIZE +
1809 sizeof(mgmt->u.action.u.measurement)))
1810 return RX_DROP_MONITOR;
1811 ieee80211_process_measurement_req(sdata, mgmt, len);
1812 break;
c481ec97
S		 1813 case WLAN_ACTION_SPCT_CHL_SWITCH:
1814 if (len < (IEEE80211_MIN_ACTION_SIZE +
1815 sizeof(mgmt->u.action.u.chan_switch)))
1816 return RX_DROP_MONITOR;
1817
1818 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0)
1819 return RX_DROP_MONITOR;
1820
1821 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1822 local->hw.conf.channel->center_freq,
1823 ifsta->ssid, ifsta->ssid_len);
1824 if (!bss)
1825 return RX_DROP_MONITOR;
1826
1827 ieee80211_process_chanswitch(sdata,
1828 &mgmt->u.action.u.chan_switch.sw_elem, bss);
1829 ieee80211_rx_bss_put(local, bss);
1830 break;
39192c0b
JB		 1831 }
1832 break;
fea14732
JM		 1833 case WLAN_CATEGORY_SA_QUERY:
1834 if (len < (IEEE80211_MIN_ACTION_SIZE +
1835 sizeof(mgmt->u.action.u.sa_query)))
1836 return RX_DROP_MONITOR;
1837 switch (mgmt->u.action.u.sa_query.action) {
1838 case WLAN_ACTION_SA_QUERY_REQUEST:
1839 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1840 return RX_DROP_MONITOR;
1841 ieee80211_process_sa_query_req(sdata, mgmt, len);
1842 break;
1843 case WLAN_ACTION_SA_QUERY_RESPONSE:
1844 /*
1845 * SA Query response is currently only used in AP mode
1846 * and it is processed in user space.
1847 */
1848 return RX_CONTINUE;
1849 }
1850 break;
39192c0b
JB		 1851 default:
1852 return RX_CONTINUE;
de1ede7a
JB		 1853 }
1854
39192c0b
JB		 1855 rx->sta->rx_packets++;
1856 dev_kfree_skb(rx->skb);
1857 return RX_QUEUED;
de1ede7a
JB		 1858}
1859
49461622 1860static ieee80211_rx_result debug_noinline
5cf121c3 1861ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 1862{
759ef3eb 1863 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
97ebe12a 1864 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
571ecf67 1865
5cf121c3 1866 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
e4c26add 1867 return RX_DROP_MONITOR;
571ecf67 1868
97ebe12a
JM		 1869 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1870 return RX_DROP_MONITOR;
1871
472dbc45
JB		 1872 if (ieee80211_vif_is_mesh(&sdata->vif))
1873 return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status);
1874
05c914fe
JB		 1875 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1876 sdata->vif.type != NL80211_IFTYPE_ADHOC)
759ef3eb
JB		 1877 return RX_DROP_MONITOR;
1878
1879 if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)
e4c26add 1880 return RX_DROP_MONITOR;
f9d540ee 1881
759ef3eb 1882 ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status);
9ae54c84 1883 return RX_QUEUED;
571ecf67
JB		 1884}
1885
571ecf67
JB		 1886static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1887 struct ieee80211_hdr *hdr,
5cf121c3 1888 struct ieee80211_rx_data *rx)
571ecf67 1889{
a7767f95
HH		 1890 int keyidx;
1891 unsigned int hdrlen;
571ecf67 1892
a7767f95 1893 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 1894 if (rx->skb->len >= hdrlen + 4)
1895 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1896 else
1897 keyidx = -1;
1898
8944b79f 1899 if (!rx->sta) {
aa0daf0e
JB		 1900 /*
1901 * Some hardware seem to generate incorrect Michael MIC
1902 * reports; ignore them to avoid triggering countermeasures.
1903 */
571ecf67
JB		 1904 goto ignore;
1905 }
1906
a7767f95 1907 if (!ieee80211_has_protected(hdr->frame_control))
571ecf67 1908 goto ignore;
571ecf67 1909
05c914fe 1910 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
aa0daf0e
JB		 1911 /*
1912 * APs with pairwise keys should never receive Michael MIC
1913 * errors for non-zero keyidx because these are reserved for
1914 * group keys and only the AP is sending real multicast
1915 * frames in the BSS.
1916 */
eb063c17 1917 goto ignore;
571ecf67
JB		 1918 }
1919
a7767f95
HH		 1920 if (!ieee80211_is_data(hdr->frame_control) &&
1921 !ieee80211_is_auth(hdr->frame_control))
571ecf67 1922 goto ignore;
571ecf67 1923
f698d856 1924 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr);
571ecf67
JB		 1925 ignore:
1926 dev_kfree_skb(rx->skb);
1927 rx->skb = NULL;
1928}
1929
5cf121c3
JB		 1930/* TODO: use IEEE80211_RX_FRAGMENTED */
1931static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
3d30d949
MW		 1932{
1933 struct ieee80211_sub_if_data *sdata;
1934 struct ieee80211_local *local = rx->local;
1935 struct ieee80211_rtap_hdr {
1936 struct ieee80211_radiotap_header hdr;
1937 u8 flags;
1938 u8 rate;
1939 __le16 chan_freq;
1940 __le16 chan_flags;
1941 } __attribute__ ((packed)) *rthdr;
1942 struct sk_buff *skb = rx->skb, *skb2;
1943 struct net_device *prev_dev = NULL;
5cf121c3 1944 struct ieee80211_rx_status *status = rx->status;
3d30d949 1945
5cf121c3 1946 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
3d30d949
MW		 1947 goto out_free_skb;
1948
1949 if (skb_headroom(skb) < sizeof(*rthdr) &&
1950 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1951 goto out_free_skb;
1952
1953 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1954 memset(rthdr, 0, sizeof(*rthdr));
1955 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1956 rthdr->hdr.it_present =
1957 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1958 (1 << IEEE80211_RADIOTAP_RATE) |
1959 (1 << IEEE80211_RADIOTAP_CHANNEL));
1960
5cf121c3 1961 rthdr->rate = rx->rate->bitrate / 5;
3d30d949
MW		 1962 rthdr->chan_freq = cpu_to_le16(status->freq);
1963
1964 if (status->band == IEEE80211_BAND_5GHZ)
1965 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1966 IEEE80211_CHAN_5GHZ);
1967 else
1968 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1969 IEEE80211_CHAN_2GHZ);
1970
1971 skb_set_mac_header(skb, 0);
1972 skb->ip_summed = CHECKSUM_UNNECESSARY;
1973 skb->pkt_type = PACKET_OTHERHOST;
1974 skb->protocol = htons(ETH_P_802_2);
1975
1976 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1977 if (!netif_running(sdata->dev))
1978 continue;
1979
05c914fe 1980 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 1981 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1982 continue;
1983
1984 if (prev_dev) {
1985 skb2 = skb_clone(skb, GFP_ATOMIC);
1986 if (skb2) {
1987 skb2->dev = prev_dev;
1988 netif_rx(skb2);
1989 }
1990 }
1991
1992 prev_dev = sdata->dev;
1993 sdata->dev->stats.rx_packets++;
1994 sdata->dev->stats.rx_bytes += skb->len;
1995 }
1996
1997 if (prev_dev) {
1998 skb->dev = prev_dev;
1999 netif_rx(skb);
2000 skb = NULL;
2001 } else
2002 goto out_free_skb;
2003
5cf121c3 2004 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
3d30d949
MW		 2005 return;
2006
2007 out_free_skb:
2008 dev_kfree_skb(skb);
2009}
2010
571ecf67 2011
8944b79f 2012static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
5cf121c3 2013 struct ieee80211_rx_data *rx,
8944b79f 2014 struct sk_buff *skb)
58905290 2015{
58905290
JB		 2016 ieee80211_rx_result res = RX_DROP_MONITOR;
2017
8944b79f
JB		 2018 rx->skb = skb;
2019 rx->sdata = sdata;
2020 rx->dev = sdata->dev;
2021
e32f85f7
LCC		 2022#define CALL_RXH(rxh) \
2023 do { \
2024 res = rxh(rx); \
2025 if (res != RX_CONTINUE) \
2026 goto rxh_done; \
2027 } while (0);
49461622
JB		 2028
2029 CALL_RXH(ieee80211_rx_h_passive_scan)
2030 CALL_RXH(ieee80211_rx_h_check)
2031 CALL_RXH(ieee80211_rx_h_decrypt)
572e0012 2032 CALL_RXH(ieee80211_rx_h_check_more_data)
49461622
JB		 2033 CALL_RXH(ieee80211_rx_h_sta_process)
2034 CALL_RXH(ieee80211_rx_h_defragment)
2035 CALL_RXH(ieee80211_rx_h_ps_poll)
2036 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2037 /* must be after MMIC verify so header is counted in MPDU mic */
2038 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2039 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 2040#ifdef CONFIG_MAC80211_MESH
e32f85f7
LCC		 2041 if (ieee80211_vif_is_mesh(&sdata->vif))
2042 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2043#endif
49461622
JB		 2044 CALL_RXH(ieee80211_rx_h_data)
2045 CALL_RXH(ieee80211_rx_h_ctrl)
de1ede7a 2046 CALL_RXH(ieee80211_rx_h_action)
49461622
JB		 2047 CALL_RXH(ieee80211_rx_h_mgmt)
2048
2049#undef CALL_RXH
2050
2051 rxh_done:
58905290
JB		 2052 switch (res) {
2053 case RX_DROP_MONITOR:
49461622
JB		 2054 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2055 if (rx->sta)
2056 rx->sta->rx_dropped++;
2057 /* fall through */
2058 case RX_CONTINUE:
3d30d949
MW		 2059 ieee80211_rx_cooked_monitor(rx);
2060 break;
58905290 2061 case RX_DROP_UNUSABLE:
49461622
JB		 2062 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2063 if (rx->sta)
2064 rx->sta->rx_dropped++;
58905290
JB		 2065 dev_kfree_skb(rx->skb);
2066 break;
49461622
JB		 2067 case RX_QUEUED:
2068 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2069 break;
58905290
JB		 2070 }
2071}
2072
571ecf67
JB		 2073/* main receive path */
2074
23a24def 2075static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
7ab17c45 2076 struct ieee80211_rx_data *rx,
23a24def
JB		 2077 struct ieee80211_hdr *hdr)
2078{
7ab17c45 2079 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
23a24def
JB		 2080 int multicast = is_multicast_ether_addr(hdr->addr1);
2081
51fb61e7 2082 switch (sdata->vif.type) {
05c914fe 2083 case NL80211_IFTYPE_STATION:
23a24def
JB		 2084 if (!bssid)
2085 return 0;
2086 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
5cf121c3 2087 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 2088 return 0;
5cf121c3 2089 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2090 } else if (!multicast &&
2091 compare_ether_addr(sdata->dev->dev_addr,
2092 hdr->addr1) != 0) {
4150c572 2093 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2094 return 0;
5cf121c3 2095 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2096 }
2097 break;
05c914fe 2098 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2099 if (!bssid)
2100 return 0;
a7767f95 2101 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2102 return 1;
87291c02 2103 }
9d9bf77d 2104 else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
5cf121c3 2105 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 2106 return 0;
5cf121c3 2107 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2108 } else if (!multicast &&
2109 compare_ether_addr(sdata->dev->dev_addr,
2110 hdr->addr1) != 0) {
4150c572 2111 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2112 return 0;
5cf121c3 2113 rx->flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2114 } else if (!rx->sta) {
2115 int rate_idx;
2116 if (rx->status->flag & RX_FLAG_HT)
2117 rate_idx = 0; /* TODO: HT rates */
2118 else
2119 rate_idx = rx->status->rate_idx;
ab1f5c0b 2120 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
0fb8ca45
JM		 2121 BIT(rate_idx));
2122 }
23a24def 2123 break;
05c914fe 2124 case NL80211_IFTYPE_MESH_POINT:
6032f934
JB		 2125 if (!multicast &&
2126 compare_ether_addr(sdata->dev->dev_addr,
2127 hdr->addr1) != 0) {
2128 if (!(sdata->dev->flags & IFF_PROMISC))
2129 return 0;
2130
5cf121c3 2131 rx->flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2132 }
2133 break;
05c914fe
JB		 2134 case NL80211_IFTYPE_AP_VLAN:
2135 case NL80211_IFTYPE_AP:
23a24def
JB		 2136 if (!bssid) {
2137 if (compare_ether_addr(sdata->dev->dev_addr,
2138 hdr->addr1))
2139 return 0;
2140 } else if (!ieee80211_bssid_match(bssid,
2141 sdata->dev->dev_addr)) {
5cf121c3 2142 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 2143 return 0;
5cf121c3 2144 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2145 }
23a24def 2146 break;
05c914fe 2147 case NL80211_IFTYPE_WDS:
a7767f95 2148 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2149 return 0;
2150 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2151 return 0;
2152 break;
05c914fe 2153 case NL80211_IFTYPE_MONITOR:
fb1c1cd6
JB		 2154 /* take everything */
2155 break;
05c914fe
JB		 2156 case NL80211_IFTYPE_UNSPECIFIED:
2157 case __NL80211_IFTYPE_AFTER_LAST:
fb1c1cd6
JB		 2158 /* should never get here */
2159 WARN_ON(1);
2160 break;
23a24def
JB		 2161 }
2162
2163 return 1;
2164}
2165
571ecf67 2166/*
6368e4b1
RR		 2167 * This is the actual Rx frames handler. as it blongs to Rx path it must
2168 * be called with rcu_read_lock protection.
571ecf67 2169 */
71ebb4aa
RR		 2170static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2171 struct sk_buff *skb,
2172 struct ieee80211_rx_status *status,
8318d78a 2173 struct ieee80211_rate *rate)
571ecf67
JB		 2174{
2175 struct ieee80211_local *local = hw_to_local(hw);
2176 struct ieee80211_sub_if_data *sdata;
571ecf67 2177 struct ieee80211_hdr *hdr;
5cf121c3 2178 struct ieee80211_rx_data rx;
6368e4b1 2179 int prepares;
8e6f0032
JB		 2180 struct ieee80211_sub_if_data *prev = NULL;
2181 struct sk_buff *skb_new;
571ecf67 2182
358c8d9d 2183 hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 2184 memset(&rx, 0, sizeof(rx));
2185 rx.skb = skb;
2186 rx.local = local;
2187
5cf121c3 2188 rx.status = status;
5cf121c3 2189 rx.rate = rate;
72abd81b 2190
358c8d9d 2191 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
571ecf67 2192 local->dot11ReceivedFragmentCount++;
571ecf67 2193
8944b79f
JB		 2194 rx.sta = sta_info_get(local, hdr->addr2);
2195 if (rx.sta) {
d0709a65
JB		 2196 rx.sdata = rx.sta->sdata;
2197 rx.dev = rx.sta->sdata->dev;
b2e7771e 2198 }
571ecf67 2199
571ecf67 2200 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
8944b79f 2201 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
d0709a65 2202 return;
571ecf67
JB		 2203 }
2204
c2b13452 2205 if (unlikely(local->sw_scanning || local->hw_scanning))
5cf121c3 2206 rx.flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2207
38f3714d 2208 ieee80211_parse_qos(&rx);
d1c3a37c 2209 ieee80211_verify_alignment(&rx);
38f3714d 2210
571ecf67
JB		 2211 skb = rx.skb;
2212
79010420 2213 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2a8a9a88
JB		 2214 if (!netif_running(sdata->dev))
2215 continue;
2216
05c914fe 2217 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 2218 continue;
2219
5cf121c3 2220 rx.flags |= IEEE80211_RX_RA_MATCH;
7ab17c45 2221 prepares = prepare_for_handlers(sdata, &rx, hdr);
23a24def 2222
6368e4b1 2223 if (!prepares)
23a24def 2224 continue;
8e6f0032 2225
340e11f3
JB		 2226 /*
2227 * frame is destined for this interface, but if it's not
2228 * also for the previous one we handle that after the
2229 * loop to avoid copying the SKB once too much
2230 */
2231
2232 if (!prev) {
2233 prev = sdata;
2234 continue;
8e6f0032 2235 }
340e11f3
JB		 2236
2237 /*
2238 * frame was destined for the previous interface
2239 * so invoke RX handlers for it
2240 */
2241
2242 skb_new = skb_copy(skb, GFP_ATOMIC);
2243 if (!skb_new) {
2244 if (net_ratelimit())
2245 printk(KERN_DEBUG "%s: failed to copy "
a4278e18 2246 "multicast frame for %s\n",
dd1cd4c6
JB		 2247 wiphy_name(local->hw.wiphy),
2248 prev->dev->name);
340e11f3
JB		 2249 continue;
2250 }
8944b79f 2251 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
8e6f0032 2252 prev = sdata;
571ecf67 2253 }
a4b7d7bd 2254 if (prev)
8944b79f 2255 ieee80211_invoke_rx_handlers(prev, &rx, skb);
a4b7d7bd 2256 else
8e6f0032 2257 dev_kfree_skb(skb);
571ecf67 2258}
6368e4b1 2259
b580781e
RR		 2260#define SEQ_MODULO 0x1000
2261#define SEQ_MASK 0xfff
2262
2263static inline int seq_less(u16 sq1, u16 sq2)
2264{
c6a1fa12 2265 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
b580781e
RR		 2266}
2267
2268static inline u16 seq_inc(u16 sq)
2269{
c6a1fa12 2270 return (sq + 1) & SEQ_MASK;
b580781e
RR		 2271}
2272
2273static inline u16 seq_sub(u16 sq1, u16 sq2)
2274{
c6a1fa12 2275 return (sq1 - sq2) & SEQ_MASK;
b580781e
RR		 2276}
2277
2278
71364716
RR		 2279/*
2280 * As it function blongs to Rx path it must be called with
2281 * the proper rcu_read_lock protection for its flow.
2282 */
c6a1fa12
JB		 2283static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2284 struct tid_ampdu_rx *tid_agg_rx,
2285 struct sk_buff *skb,
2286 u16 mpdu_seq_num,
2287 int bar_req)
b580781e
RR		 2288{
2289 struct ieee80211_local *local = hw_to_local(hw);
2290 struct ieee80211_rx_status status;
2291 u16 head_seq_num, buf_size;
2292 int index;
8318d78a
JB		 2293 struct ieee80211_supported_band *sband;
2294 struct ieee80211_rate *rate;
b580781e
RR		 2295
2296 buf_size = tid_agg_rx->buf_size;
2297 head_seq_num = tid_agg_rx->head_seq_num;
2298
2299 /* frame with out of date sequence number */
2300 if (seq_less(mpdu_seq_num, head_seq_num)) {
2301 dev_kfree_skb(skb);
2302 return 1;
2303 }
2304
2305 /* if frame sequence number exceeds our buffering window size or
2306 * block Ack Request arrived - release stored frames */
2307 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2308 /* new head to the ordering buffer */
2309 if (bar_req)
2310 head_seq_num = mpdu_seq_num;
2311 else
2312 head_seq_num =
2313 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2314 /* release stored frames up to new head to stack */
2315 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2316 index = seq_sub(tid_agg_rx->head_seq_num,
2317 tid_agg_rx->ssn)
2318 % tid_agg_rx->buf_size;
2319
2320 if (tid_agg_rx->reorder_buf[index]) {
2321 /* release the reordered frames to stack */
2322 memcpy(&status,
2323 tid_agg_rx->reorder_buf[index]->cb,
2324 sizeof(status));
8318d78a 2325 sband = local->hw.wiphy->bands[status.band];
0fb8ca45
JM		 2326 if (status.flag & RX_FLAG_HT) {
2327 /* TODO: HT rates */
2328 rate = sband->bitrates;
2329 } else {
2330 rate = &sband->bitrates
2331 [status.rate_idx];
2332 }
b580781e
RR		 2333 __ieee80211_rx_handle_packet(hw,
2334 tid_agg_rx->reorder_buf[index],
9e72ebd6 2335 &status, rate);
b580781e
RR		 2336 tid_agg_rx->stored_mpdu_num--;
2337 tid_agg_rx->reorder_buf[index] = NULL;
2338 }
2339 tid_agg_rx->head_seq_num =
2340 seq_inc(tid_agg_rx->head_seq_num);
2341 }
2342 if (bar_req)
2343 return 1;
2344 }
2345
2346 /* now the new frame is always in the range of the reordering */
2347 /* buffer window */
2348 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2349 % tid_agg_rx->buf_size;
2350 /* check if we already stored this frame */
2351 if (tid_agg_rx->reorder_buf[index]) {
2352 dev_kfree_skb(skb);
2353 return 1;
2354 }
2355
2356 /* if arrived mpdu is in the right order and nothing else stored */
2357 /* release it immediately */
2358 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2359 tid_agg_rx->stored_mpdu_num == 0) {
2360 tid_agg_rx->head_seq_num =
2361 seq_inc(tid_agg_rx->head_seq_num);
2362 return 0;
2363 }
2364
2365 /* put the frame in the reordering buffer */
2366 tid_agg_rx->reorder_buf[index] = skb;
2367 tid_agg_rx->stored_mpdu_num++;
2368 /* release the buffer until next missing frame */
2369 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2370 % tid_agg_rx->buf_size;
2371 while (tid_agg_rx->reorder_buf[index]) {
2372 /* release the reordered frame back to stack */
2373 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2374 sizeof(status));
8318d78a 2375 sband = local->hw.wiphy->bands[status.band];
0fb8ca45
JM		 2376 if (status.flag & RX_FLAG_HT)
2377 rate = sband->bitrates; /* TODO: HT rates */
2378 else
2379 rate = &sband->bitrates[status.rate_idx];
b580781e 2380 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
9e72ebd6 2381 &status, rate);
b580781e
RR		 2382 tid_agg_rx->stored_mpdu_num--;
2383 tid_agg_rx->reorder_buf[index] = NULL;
2384 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2385 index = seq_sub(tid_agg_rx->head_seq_num,
2386 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2387 }
2388 return 1;
2389}
2390
71ebb4aa
RR		 2391static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2392 struct sk_buff *skb)
b580781e
RR		 2393{
2394 struct ieee80211_hw *hw = &local->hw;
2395 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2396 struct sta_info *sta;
2397 struct tid_ampdu_rx *tid_agg_rx;
87228f57 2398 u16 sc;
b580781e 2399 u16 mpdu_seq_num;
182503ab 2400 u8 ret = 0;
b580781e
RR		 2401 int tid;
2402
2403 sta = sta_info_get(local, hdr->addr2);
2404 if (!sta)
2405 return ret;
2406
b580781e
RR		 2407 /* filter the QoS data rx stream according to
2408 * STA/TID and check if this STA/TID is on aggregation */
87228f57 2409 if (!ieee80211_is_data_qos(hdr->frame_control))
b580781e
RR		 2410 goto end_reorder;
2411
238f74a2 2412 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
b580781e 2413
cee24a3e 2414 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
b580781e
RR		 2415 goto end_reorder;
2416
cee24a3e
RR		 2417 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2418
2560b6e2
EG		 2419 /* qos null data frames are excluded */
2420 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
b580781e
RR		 2421 goto end_reorder;
2422
2423 /* new un-ordered ampdu frame - process it */
2424
2425 /* reset session timer */
20ad19d0
JB		 2426 if (tid_agg_rx->timeout)
2427 mod_timer(&tid_agg_rx->session_timer,
2428 TU_TO_EXP_TIME(tid_agg_rx->timeout));
b580781e
RR		 2429
2430 /* if this mpdu is fragmented - terminate rx aggregation session */
2431 sc = le16_to_cpu(hdr->seq_ctrl);
2432 if (sc & IEEE80211_SCTL_FRAG) {
17741cdc 2433 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
b580781e
RR		 2434 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2435 ret = 1;
2436 goto end_reorder;
2437 }
2438
2439 /* according to mpdu sequence number deal with reordering buffer */
2440 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2441 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2442 mpdu_seq_num, 0);
d0709a65 2443 end_reorder:
b580781e
RR		 2444 return ret;
2445}
2446
6368e4b1
RR		 2447/*
2448 * This is the receive path handler. It is called by a low level driver when an
2449 * 802.11 MPDU is received from the hardware.
2450 */
2451void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2452 struct ieee80211_rx_status *status)
2453{
2454 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2455 struct ieee80211_rate *rate = NULL;
2456 struct ieee80211_supported_band *sband;
2457
2458 if (status->band < 0 ||
13d8fd2d 2459 status->band >= IEEE80211_NUM_BANDS) {
8318d78a
JB		 2460 WARN_ON(1);
2461 return;
2462 }
2463
2464 sband = local->hw.wiphy->bands[status->band];
0fb8ca45 2465 if (!sband) {
8318d78a
JB		 2466 WARN_ON(1);
2467 return;
2468 }
2469
0fb8ca45
JM		 2470 if (status->flag & RX_FLAG_HT) {
2471 /* rate_idx is MCS index */
2472 if (WARN_ON(status->rate_idx < 0 ||
2473 status->rate_idx >= 76))
2474 return;
2475 /* HT rates are not in the table - use the highest legacy rate
2476 * for now since other parts of mac80211 may not yet be fully
2477 * MCS aware. */
2478 rate = &sband->bitrates[sband->n_bitrates - 1];
2479 } else {
2480 if (WARN_ON(status->rate_idx < 0 ||
2481 status->rate_idx >= sband->n_bitrates))
2482 return;
2483 rate = &sband->bitrates[status->rate_idx];
2484 }
6368e4b1
RR		 2485
2486 /*
2487 * key references and virtual interfaces are protected using RCU
2488 * and this requires that we are in a read-side RCU section during
2489 * receive processing
2490 */
2491 rcu_read_lock();
2492
2493 /*
2494 * Frames with failed FCS/PLCP checksum are not returned,
2495 * all other frames are returned without radiotap header
2496 * if it was previously present.
2497 * Also, frames with less than 16 bytes are dropped.
2498 */
8318d78a 2499 skb = ieee80211_rx_monitor(local, skb, status, rate);
6368e4b1
RR		 2500 if (!skb) {
2501 rcu_read_unlock();
2502 return;
2503 }
2504
b580781e 2505 if (!ieee80211_rx_reorder_ampdu(local, skb))
9e72ebd6 2506 __ieee80211_rx_handle_packet(hw, skb, status, rate);
6368e4b1
RR		 2507
2508 rcu_read_unlock();
2509}
571ecf67
JB		 2510EXPORT_SYMBOL(__ieee80211_rx);
2511
2512/* This is a version of the rx handler that can be called from hard irq
2513 * context. Post the skb on the queue and schedule the tasklet */
2514void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2515 struct ieee80211_rx_status *status)
2516{
2517 struct ieee80211_local *local = hw_to_local(hw);
2518
2519 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2520
2521 skb->dev = local->mdev;
2522 /* copy status into skb->cb for use by tasklet */
2523 memcpy(skb->cb, status, sizeof(*status));
2524 skb->pkt_type = IEEE80211_RX_MSG;
2525 skb_queue_tail(&local->skb_queue, skb);
2526 tasklet_schedule(&local->tasklet);
2527}
2528EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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