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[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,
42 struct sk_buff *skb,
43 int rtap_len)
44{
45 skb_pull(skb, rtap_len);
46
47 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
48 if (likely(skb->len > FCS_LEN))
49 skb_trim(skb, skb->len - FCS_LEN);
50 else {
51 /* driver bug */
52 WARN_ON(1);
53 dev_kfree_skb(skb);
54 skb = NULL;
55 }
56 }
57
58 return skb;
59}
60
f1d58c25 61static inline int should_drop_frame(struct sk_buff *skb,
b2e7771e
JB		 62 int present_fcs_len,
63 int radiotap_len)
64{
f1d58c25 65 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 66 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 67
68 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
69 return 1;
70 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
71 return 1;
87228f57
HH		 72 if (ieee80211_is_ctl(hdr->frame_control) &&
73 !ieee80211_is_pspoll(hdr->frame_control) &&
74 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 75 return 1;
76 return 0;
77}
78
601ae7f2
BR		 79static int
80ieee80211_rx_radiotap_len(struct ieee80211_local *local,
81 struct ieee80211_rx_status *status)
82{
83 int len;
84
85 /* always present fields */
86 len = sizeof(struct ieee80211_radiotap_header) + 9;
87
88 if (status->flag & RX_FLAG_TSFT)
89 len += 8;
7fee5372 90 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2
BR		 91 len += 1;
92 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
93 len += 1;
94
95 if (len & 1) /* padding for RX_FLAGS if necessary */
96 len++;
97
98 /* make sure radiotap starts at a naturally aligned address */
99 if (len % 8)
100 len = roundup(len, 8);
101
102 return len;
103}
104
d1c3a37c 105/*
601ae7f2
BR		 106 * ieee80211_add_rx_radiotap_header - add radiotap header
107 *
108 * add a radiotap header containing all the fields which the hardware provided.
109 */
110static void
111ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
112 struct sk_buff *skb,
601ae7f2
BR		 113 struct ieee80211_rate *rate,
114 int rtap_len)
115{
f1d58c25 116 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 117 struct ieee80211_radiotap_header *rthdr;
118 unsigned char *pos;
119
120 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
121 memset(rthdr, 0, rtap_len);
122
123 /* radiotap header, set always present flags */
124 rthdr->it_present =
125 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 126 (1 << IEEE80211_RADIOTAP_CHANNEL) |
127 (1 << IEEE80211_RADIOTAP_ANTENNA) |
128 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
129 rthdr->it_len = cpu_to_le16(rtap_len);
130
131 pos = (unsigned char *)(rthdr+1);
132
133 /* the order of the following fields is important */
134
135 /* IEEE80211_RADIOTAP_TSFT */
136 if (status->flag & RX_FLAG_TSFT) {
137 *(__le64 *)pos = cpu_to_le64(status->mactime);
138 rthdr->it_present |=
139 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
140 pos += 8;
141 }
142
143 /* IEEE80211_RADIOTAP_FLAGS */
144 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
145 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 146 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
147 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 148 if (status->flag & RX_FLAG_SHORTPRE)
149 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 150 pos++;
151
152 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 153 if (status->flag & RX_FLAG_HT) {
154 /*
155 * TODO: add following information into radiotap header once
156 * suitable fields are defined for it:
157 * - MCS index (status->rate_idx)
158 * - HT40 (status->flag & RX_FLAG_40MHZ)
159 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
160 */
161 *pos = 0;
8d6f658e 162 } else {
ebe6c7ba 163 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 164 *pos = rate->bitrate / 5;
8d6f658e 165 }
601ae7f2
BR		 166 pos++;
167
168 /* IEEE80211_RADIOTAP_CHANNEL */
169 *(__le16 *)pos = cpu_to_le16(status->freq);
170 pos += 2;
171 if (status->band == IEEE80211_BAND_5GHZ)
172 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
173 IEEE80211_CHAN_5GHZ);
9deb1ae5
BR		 174 else if (rate->flags & IEEE80211_RATE_ERP_G)
175 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
176 IEEE80211_CHAN_2GHZ);
601ae7f2 177 else
9deb1ae5 178 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
601ae7f2
BR		 179 IEEE80211_CHAN_2GHZ);
180 pos += 2;
181
182 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
183 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
184 *pos = status->signal;
185 rthdr->it_present |=
186 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
187 pos++;
188 }
189
190 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
191 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
192 *pos = status->noise;
193 rthdr->it_present |=
194 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
195 pos++;
196 }
197
198 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
199
200 /* IEEE80211_RADIOTAP_ANTENNA */
201 *pos = status->antenna;
202 pos++;
203
601ae7f2
BR		 204 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
205
206 /* IEEE80211_RADIOTAP_RX_FLAGS */
207 /* ensure 2 byte alignment for the 2 byte field as required */
208 if ((pos - (unsigned char *)rthdr) & 1)
209 pos++;
aae89831
JB		 210 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
211 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADPLCP);
601ae7f2
BR		 212 pos += 2;
213}
214
b2e7771e
JB		 215/*
216 * This function copies a received frame to all monitor interfaces and
217 * returns a cleaned-up SKB that no longer includes the FCS nor the
218 * radiotap header the driver might have added.
219 */
220static struct sk_buff *
221ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 222 struct ieee80211_rate *rate)
b2e7771e 223{
f1d58c25 224 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 225 struct ieee80211_sub_if_data *sdata;
b2e7771e 226 int needed_headroom = 0;
b2e7771e
JB		 227 struct sk_buff *skb, *skb2;
228 struct net_device *prev_dev = NULL;
229 int present_fcs_len = 0;
230 int rtap_len = 0;
231
232 /*
233 * First, we may need to make a copy of the skb because
234 * (1) we need to modify it for radiotap (if not present), and
235 * (2) the other RX handlers will modify the skb we got.
236 *
237 * We don't need to, of course, if we aren't going to return
238 * the SKB because it has a bad FCS/PLCP checksum.
239 */
240 if (status->flag & RX_FLAG_RADIOTAP)
241 rtap_len = ieee80211_get_radiotap_len(origskb->data);
242 else
601ae7f2
BR		 243 /* room for the radiotap header based on driver features */
244 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 245
246 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
247 present_fcs_len = FCS_LEN;
248
249 if (!local->monitors) {
f1d58c25 250 if (should_drop_frame(origskb, present_fcs_len, rtap_len)) {
b2e7771e
JB		 251 dev_kfree_skb(origskb);
252 return NULL;
253 }
254
255 return remove_monitor_info(local, origskb, rtap_len);
256 }
257
f1d58c25 258 if (should_drop_frame(origskb, present_fcs_len, rtap_len)) {
b2e7771e
JB		 259 /* only need to expand headroom if necessary */
260 skb = origskb;
261 origskb = NULL;
262
263 /*
264 * This shouldn't trigger often because most devices have an
265 * RX header they pull before we get here, and that should
266 * be big enough for our radiotap information. We should
267 * probably export the length to drivers so that we can have
268 * them allocate enough headroom to start with.
269 */
270 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 271 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 272 dev_kfree_skb(skb);
273 return NULL;
274 }
275 } else {
276 /*
277 * Need to make a copy and possibly remove radiotap header
278 * and FCS from the original.
279 */
280 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
281
282 origskb = remove_monitor_info(local, origskb, rtap_len);
283
284 if (!skb)
285 return origskb;
286 }
287
288 /* if necessary, prepend radiotap information */
601ae7f2 289 if (!(status->flag & RX_FLAG_RADIOTAP))
f1d58c25 290 ieee80211_add_rx_radiotap_header(local, skb, rate,
601ae7f2 291 needed_headroom);
b2e7771e 292
ce3edf6d 293 skb_reset_mac_header(skb);
b2e7771e
JB		 294 skb->ip_summed = CHECKSUM_UNNECESSARY;
295 skb->pkt_type = PACKET_OTHERHOST;
296 skb->protocol = htons(ETH_P_802_2);
297
298 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
299 if (!netif_running(sdata->dev))
300 continue;
301
05c914fe 302 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 303 continue;
304
3d30d949
MW		 305 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
306 continue;
307
b2e7771e
JB		 308 if (prev_dev) {
309 skb2 = skb_clone(skb, GFP_ATOMIC);
310 if (skb2) {
311 skb2->dev = prev_dev;
312 netif_rx(skb2);
313 }
314 }
315
316 prev_dev = sdata->dev;
317 sdata->dev->stats.rx_packets++;
318 sdata->dev->stats.rx_bytes += skb->len;
319 }
320
321 if (prev_dev) {
322 skb->dev = prev_dev;
323 netif_rx(skb);
324 } else
325 dev_kfree_skb(skb);
326
327 return origskb;
328}
329
330
5cf121c3 331static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 332{
238f74a2 333 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
6e0d114d
JB		 334 int tid;
335
336 /* does the frame have a qos control field? */
238f74a2
HH		 337 if (ieee80211_is_data_qos(hdr->frame_control)) {
338 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 339 /* frame has qos control */
238f74a2
HH		 340 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
341 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
5cf121c3 342 rx->flags |= IEEE80211_RX_AMSDU;
fd4c7f2f 343 else
5cf121c3 344 rx->flags &= ~IEEE80211_RX_AMSDU;
6e0d114d 345 } else {
1411f9b5
JB		 346 /*
347 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
348 *
349 * Sequence numbers for management frames, QoS data
350 * frames with a broadcast/multicast address in the
351 * Address 1 field, and all non-QoS data frames sent
352 * by QoS STAs are assigned using an additional single
353 * modulo-4096 counter, [...]
354 *
355 * We also use that counter for non-QoS STAs.
356 */
357 tid = NUM_RX_DATA_QUEUES - 1;
6e0d114d 358 }
52865dfd 359
5cf121c3 360 rx->queue = tid;
6e0d114d
JB		 361 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
362 * For now, set skb->priority to 0 for other cases. */
363 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 364}
6e0d114d 365
d1c3a37c
JB		 366/**
367 * DOC: Packet alignment
368 *
369 * Drivers always need to pass packets that are aligned to two-byte boundaries
370 * to the stack.
371 *
372 * Additionally, should, if possible, align the payload data in a way that
373 * guarantees that the contained IP header is aligned to a four-byte
374 * boundary. In the case of regular frames, this simply means aligning the
375 * payload to a four-byte boundary (because either the IP header is directly
376 * contained, or IV/RFC1042 headers that have a length divisible by four are
377 * in front of it).
378 *
379 * With A-MSDU frames, however, the payload data address must yield two modulo
380 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
381 * push the IP header further back to a multiple of four again. Thankfully, the
382 * specs were sane enough this time around to require padding each A-MSDU
383 * subframe to a length that is a multiple of four.
384 *
385 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
386 * the payload is not supported, the driver is required to move the 802.11
387 * header to be directly in front of the payload in that case.
388 */
389static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 390{
a7767f95 391 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
38f3714d
JB		 392 int hdrlen;
393
d1c3a37c
JB		 394#ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
395 return;
396#endif
397
398 if (WARN_ONCE((unsigned long)rx->skb->data & 1,
399 "unaligned packet at 0x%p\n", rx->skb->data))
400 return;
401
a7767f95 402 if (!ieee80211_is_data_present(hdr->frame_control))
38f3714d
JB		 403 return;
404
a7767f95 405 hdrlen = ieee80211_hdrlen(hdr->frame_control);
5cf121c3 406 if (rx->flags & IEEE80211_RX_AMSDU)
38f3714d 407 hdrlen += ETH_HLEN;
d1c3a37c
JB		 408 WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3,
409 "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen);
6e0d114d
JB		 410}
411
6368e4b1 412
571ecf67
JB		 413/* rx handlers */
414
49461622 415static ieee80211_rx_result debug_noinline
5cf121c3 416ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 417{
418 struct ieee80211_local *local = rx->local;
419 struct sk_buff *skb = rx->skb;
420
c2b13452 421 if (unlikely(local->hw_scanning))
f1d58c25 422 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 423
c2b13452 424 if (unlikely(local->sw_scanning)) {
ece8eddd 425 /* drop all the other packets during a software scan anyway */
f1d58c25 426 if (ieee80211_scan_rx(rx->sdata, skb) != 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
3017b80b 630 /*
1990af8d 631 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 632 * addressed to us nor a multicast frame.
633 */
5cf121c3 634 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 635 return RX_CONTINUE;
3017b80b 636
d4e46a3d
JB		 637 if (rx->sta)
638 stakey = rcu_dereference(rx->sta->key);
639
0c7c10c7
JM		 640 if (!ieee80211_has_protected(hdr->frame_control))
641 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
642
d4e46a3d
JB		 643 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
644 rx->key = stakey;
0c7c10c7
JM		 645 /* Skip decryption if the frame is not protected. */
646 if (!ieee80211_has_protected(hdr->frame_control))
647 return RX_CONTINUE;
3cfcf6ac
JM		 648 } else if (mmie_keyidx >= 0) {
649 /* Broadcast/multicast robust management frame / BIP */
650 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
651 (rx->status->flag & RX_FLAG_IV_STRIPPED))
652 return RX_CONTINUE;
653
654 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
655 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
656 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
657 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
0c7c10c7
JM		 658 } else if (!ieee80211_has_protected(hdr->frame_control)) {
659 /*
660 * The frame was not protected, so skip decryption. However, we
661 * need to set rx->key if there is a key that could have been
662 * used so that the frame may be dropped if encryption would
663 * have been expected.
664 */
665 struct ieee80211_key *key = NULL;
666 if (ieee80211_is_mgmt(hdr->frame_control) &&
667 is_multicast_ether_addr(hdr->addr1) &&
668 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
669 rx->key = key;
670 else if ((key = rcu_dereference(rx->sdata->default_key)))
671 rx->key = key;
672 return RX_CONTINUE;
571ecf67 673 } else {
3017b80b
JB		 674 /*
675 * The device doesn't give us the IV so we won't be
676 * able to look up the key. That's ok though, we
677 * don't need to decrypt the frame, we just won't
678 * be able to keep statistics accurate.
679 * Except for key threshold notifications, should
680 * we somehow allow the driver to tell us which key
681 * the hardware used if this flag is set?
682 */
5cf121c3
JB		 683 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
684 (rx->status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 685 return RX_CONTINUE;
3017b80b 686
a7767f95 687 hdrlen = ieee80211_hdrlen(hdr->frame_control);
3017b80b
JB		 688
689 if (rx->skb->len < 8 + hdrlen)
e4c26add 690 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 691
692 /*
693 * no need to call ieee80211_wep_get_keyidx,
694 * it verifies a bunch of things we've done already
695 */
696 keyidx = rx->skb->data[hdrlen + 3] >> 6;
697
d4e46a3d 698 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
3017b80b
JB		 699
700 /*
701 * RSNA-protected unicast frames should always be sent with
702 * pairwise or station-to-station keys, but for WEP we allow
703 * using a key index as well.
704 */
8f20fc24 705 if (rx->key && rx->key->conf.alg != ALG_WEP &&
3017b80b
JB		 706 !is_multicast_ether_addr(hdr->addr1))
707 rx->key = NULL;
571ecf67
JB		 708 }
709
3017b80b 710 if (rx->key) {
571ecf67 711 rx->key->tx_rx_count++;
011bfcc4 712 /* TODO: add threshold stuff again */
1990af8d 713 } else {
e4c26add 714 return RX_DROP_MONITOR;
70f08765
JB		 715 }
716
1990af8d
JB		 717 /* Check for weak IVs if possible */
718 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
a7767f95 719 ieee80211_is_data(hdr->frame_control) &&
5cf121c3
JB		 720 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
721 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
1990af8d
JB		 722 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
723 rx->sta->wep_weak_iv_count++;
724
70f08765
JB		 725 switch (rx->key->conf.alg) {
726 case ALG_WEP:
e2f036da
MN		 727 result = ieee80211_crypto_wep_decrypt(rx);
728 break;
70f08765 729 case ALG_TKIP:
e2f036da
MN		 730 result = ieee80211_crypto_tkip_decrypt(rx);
731 break;
70f08765 732 case ALG_CCMP:
e2f036da
MN		 733 result = ieee80211_crypto_ccmp_decrypt(rx);
734 break;
3cfcf6ac
JM		 735 case ALG_AES_CMAC:
736 result = ieee80211_crypto_aes_cmac_decrypt(rx);
737 break;
70f08765
JB		 738 }
739
e2f036da 740 /* either the frame has been decrypted or will be dropped */
5cf121c3 741 rx->status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 742
743 return result;
70f08765
JB		 744}
745
572e0012
KV		 746static ieee80211_rx_result debug_noinline
747ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
748{
749 struct ieee80211_local *local;
750 struct ieee80211_hdr *hdr;
751 struct sk_buff *skb;
752
753 local = rx->local;
754 skb = rx->skb;
755 hdr = (struct ieee80211_hdr *) skb->data;
756
757 if (!local->pspolling)
758 return RX_CONTINUE;
759
760 if (!ieee80211_has_fromds(hdr->frame_control))
761 /* this is not from AP */
762 return RX_CONTINUE;
763
764 if (!ieee80211_is_data(hdr->frame_control))
765 return RX_CONTINUE;
766
767 if (!ieee80211_has_moredata(hdr->frame_control)) {
768 /* AP has no more frames buffered for us */
769 local->pspolling = false;
770 return RX_CONTINUE;
771 }
772
773 /* more data bit is set, let's request a new frame from the AP */
774 ieee80211_send_pspoll(local, rx->sdata);
775
776 return RX_CONTINUE;
777}
778
133b8226 779static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 780{
133b8226 781 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 782 struct ieee80211_local *local = sdata->local;
0795af57 783
3e122be0 784 atomic_inc(&sdata->bss->num_sta_ps);
07346f81 785 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
24487981 786 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 787#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26
JB		 788 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
789 sdata->dev->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 790#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
791}
792
133b8226 793static int ap_sta_ps_end(struct sta_info *sta)
571ecf67 794{
133b8226
JB		 795 struct ieee80211_sub_if_data *sdata = sta->sdata;
796 struct ieee80211_local *local = sdata->local;
8f77f384 797 int sent, buffered;
571ecf67 798
3e122be0 799 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 800
07346f81 801 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
24487981 802 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta);
004c872e
JB		 803
804 if (!skb_queue_empty(&sta->ps_tx_buf))
805 sta_info_clear_tim_bit(sta);
806
571ecf67 807#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26
JB		 808 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
809 sdata->dev->name, sta->sta.addr, sta->sta.aid);
571ecf67 810#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 811
571ecf67 812 /* Send all buffered frames to the station */
8f77f384
JB		 813 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
814 buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf);
815 sent += buffered;
816 local->total_ps_buffered -= buffered;
817
571ecf67 818#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
8f77f384
JB		 819 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
820 "since STA not sleeping anymore\n", sdata->dev->name,
821 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
571ecf67 822#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
571ecf67
JB		 823
824 return sent;
825}
826
49461622 827static ieee80211_rx_result debug_noinline
5cf121c3 828ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 829{
830 struct sta_info *sta = rx->sta;
a7767f95 831 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 832
833 if (!sta)
9ae54c84 834 return RX_CONTINUE;
571ecf67 835
b291ba11
JB		 836 /*
837 * Update last_rx only for IBSS packets which are for the current
838 * BSSID to avoid keeping the current IBSS network alive in cases
839 * where other STAs start using different BSSID.
840 */
05c914fe 841 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 842 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 843 NL80211_IFTYPE_ADHOC);
46900298 844 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
571ecf67 845 sta->last_rx = jiffies;
b291ba11
JB		 846 } else if (!is_multicast_ether_addr(hdr->addr1)) {
847 /*
33b64eb2
LCC		 848 * Mesh beacons will update last_rx when if they are found to
849 * match the current local configuration when processed.
571ecf67 850 */
b291ba11 851 sta->last_rx = jiffies;
571ecf67
JB		 852 }
853
5cf121c3 854 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 855 return RX_CONTINUE;
571ecf67 856
3cf335d5
KV		 857 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
858 ieee80211_sta_rx_notify(rx->sdata, hdr);
859
571ecf67
JB		 860 sta->rx_fragments++;
861 sta->rx_bytes += rx->skb->len;
5cf121c3 862 sta->last_signal = rx->status->signal;
566bfe5a 863 sta->last_qual = rx->status->qual;
5cf121c3 864 sta->last_noise = rx->status->noise;
571ecf67 865
72eaa43a
JB		 866 /*
867 * Change STA power saving mode only at the end of a frame
868 * exchange sequence.
869 */
3e122be0 870 if (!ieee80211_has_morefrags(hdr->frame_control) &&
05c914fe
JB		 871 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
872 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
72eaa43a
JB		 873 if (test_sta_flags(sta, WLAN_STA_PS)) {
874 /*
875 * Ignore doze->wake transitions that are
876 * indicated by non-data frames, the standard
877 * is unclear here, but for example going to
878 * PS mode and then scanning would cause a
879 * doze->wake transition for the probe request,
880 * and that is clearly undesirable.
881 */
882 if (ieee80211_is_data(hdr->frame_control) &&
883 !ieee80211_has_pm(hdr->frame_control))
884 rx->sent_ps_buffered += ap_sta_ps_end(sta);
885 } else {
886 if (ieee80211_has_pm(hdr->frame_control))
887 ap_sta_ps_start(sta);
888 }
571ecf67
JB		 889 }
890
891 /* Drop data::nullfunc frames silently, since they are used only to
892 * control station power saving mode. */
a7767f95 893 if (ieee80211_is_nullfunc(hdr->frame_control)) {
571ecf67
JB		 894 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
895 /* Update counter and free packet here to avoid counting this
896 * as a dropped packed. */
897 sta->rx_packets++;
898 dev_kfree_skb(rx->skb);
9ae54c84 899 return RX_QUEUED;
571ecf67
JB		 900 }
901
9ae54c84 902 return RX_CONTINUE;
571ecf67
JB		 903} /* ieee80211_rx_h_sta_process */
904
571ecf67
JB		 905static inline struct ieee80211_fragment_entry *
906ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
907 unsigned int frag, unsigned int seq, int rx_queue,
908 struct sk_buff **skb)
909{
910 struct ieee80211_fragment_entry *entry;
911 int idx;
912
913 idx = sdata->fragment_next;
914 entry = &sdata->fragments[sdata->fragment_next++];
915 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
916 sdata->fragment_next = 0;
917
918 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 919#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 920 struct ieee80211_hdr *hdr =
921 (struct ieee80211_hdr *) entry->skb_list.next->data;
922 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
923 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 924 "addr1=%pM addr2=%pM\n",
571ecf67
JB		 925 sdata->dev->name, idx,
926 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 927 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 928#endif
571ecf67
JB		 929 __skb_queue_purge(&entry->skb_list);
930 }
931
932 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
933 *skb = NULL;
934 entry->first_frag_time = jiffies;
935 entry->seq = seq;
936 entry->rx_queue = rx_queue;
937 entry->last_frag = frag;
938 entry->ccmp = 0;
939 entry->extra_len = 0;
940
941 return entry;
942}
943
944static inline struct ieee80211_fragment_entry *
945ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 946 unsigned int frag, unsigned int seq,
571ecf67
JB		 947 int rx_queue, struct ieee80211_hdr *hdr)
948{
949 struct ieee80211_fragment_entry *entry;
950 int i, idx;
951
952 idx = sdata->fragment_next;
953 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
954 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 955
956 idx--;
957 if (idx < 0)
958 idx = IEEE80211_FRAGMENT_MAX - 1;
959
960 entry = &sdata->fragments[idx];
961 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
962 entry->rx_queue != rx_queue ||
963 entry->last_frag + 1 != frag)
964 continue;
965
b73d70ad 966 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 967
b73d70ad
HH		 968 /*
969 * Check ftype and addresses are equal, else check next fragment
970 */
971 if (((hdr->frame_control ^ f_hdr->frame_control) &
972 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 973 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
974 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
975 continue;
976
ab46623e 977 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 978 __skb_queue_purge(&entry->skb_list);
979 continue;
980 }
981 return entry;
982 }
983
984 return NULL;
985}
986
49461622 987static ieee80211_rx_result debug_noinline
5cf121c3 988ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 989{
990 struct ieee80211_hdr *hdr;
991 u16 sc;
358c8d9d 992 __le16 fc;
571ecf67
JB		 993 unsigned int frag, seq;
994 struct ieee80211_fragment_entry *entry;
995 struct sk_buff *skb;
996
b73d70ad 997 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 998 fc = hdr->frame_control;
571ecf67
JB		 999 sc = le16_to_cpu(hdr->seq_ctrl);
1000 frag = sc & IEEE80211_SCTL_FRAG;
1001
358c8d9d 1002 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1003 (rx->skb)->len < 24 ||
1004 is_multicast_ether_addr(hdr->addr1))) {
1005 /* not fragmented */
1006 goto out;
1007 }
1008 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1009
1010 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1011
1012 if (frag == 0) {
1013 /* This is the first fragment of a new frame. */
1014 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 1015 rx->queue, &(rx->skb));
8f20fc24 1016 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
358c8d9d 1017 ieee80211_has_protected(fc)) {
571ecf67
JB		 1018 /* Store CCMP PN so that we can verify that the next
1019 * fragment has a sequential PN value. */
1020 entry->ccmp = 1;
1021 memcpy(entry->last_pn,
5cf121c3 1022 rx->key->u.ccmp.rx_pn[rx->queue],
571ecf67
JB		 1023 CCMP_PN_LEN);
1024 }
9ae54c84 1025 return RX_QUEUED;
571ecf67
JB		 1026 }
1027
1028 /* This is a fragment for a frame that should already be pending in
1029 * fragment cache. Add this fragment to the end of the pending entry.
1030 */
b73d70ad 1031 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 1032 if (!entry) {
1033 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1034 return RX_DROP_MONITOR;
571ecf67
JB		 1035 }
1036
1037 /* Verify that MPDUs within one MSDU have sequential PN values.
1038 * (IEEE 802.11i, 8.3.3.4.5) */
1039 if (entry->ccmp) {
1040 int i;
1041 u8 pn[CCMP_PN_LEN], *rpn;
8f20fc24 1042 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
e4c26add 1043 return RX_DROP_UNUSABLE;
571ecf67
JB		 1044 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1045 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1046 pn[i]++;
1047 if (pn[i])
1048 break;
1049 }
5cf121c3 1050 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
f4ea83dd 1051 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1052 return RX_DROP_UNUSABLE;
571ecf67
JB		 1053 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1054 }
1055
358c8d9d 1056 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1057 __skb_queue_tail(&entry->skb_list, rx->skb);
1058 entry->last_frag = frag;
1059 entry->extra_len += rx->skb->len;
358c8d9d 1060 if (ieee80211_has_morefrags(fc)) {
571ecf67 1061 rx->skb = NULL;
9ae54c84 1062 return RX_QUEUED;
571ecf67
JB		 1063 }
1064
1065 rx->skb = __skb_dequeue(&entry->skb_list);
1066 if (skb_tailroom(rx->skb) < entry->extra_len) {
1067 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1068 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1069 GFP_ATOMIC))) {
1070 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1071 __skb_queue_purge(&entry->skb_list);
e4c26add 1072 return RX_DROP_UNUSABLE;
571ecf67
JB		 1073 }
1074 }
1075 while ((skb = __skb_dequeue(&entry->skb_list))) {
1076 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1077 dev_kfree_skb(skb);
1078 }
1079
1080 /* Complete frame has been reassembled - process it now */
5cf121c3 1081 rx->flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1082
1083 out:
1084 if (rx->sta)
1085 rx->sta->rx_packets++;
1086 if (is_multicast_ether_addr(hdr->addr1))
1087 rx->local->dot11MulticastReceivedFrameCount++;
1088 else
1089 ieee80211_led_rx(rx->local);
9ae54c84 1090 return RX_CONTINUE;
571ecf67
JB		 1091}
1092
49461622 1093static ieee80211_rx_result debug_noinline
5cf121c3 1094ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1095{
98f0b0a3 1096 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
571ecf67
JB		 1097 struct sk_buff *skb;
1098 int no_pending_pkts;
358c8d9d 1099 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
571ecf67 1100
358c8d9d 1101 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
5cf121c3 1102 !(rx->flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1103 return RX_CONTINUE;
571ecf67 1104
05c914fe
JB		 1105 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1106 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1107 return RX_DROP_UNUSABLE;
98f0b0a3 1108
571ecf67
JB		 1109 skb = skb_dequeue(&rx->sta->tx_filtered);
1110 if (!skb) {
1111 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1112 if (skb)
1113 rx->local->total_ps_buffered--;
1114 }
1115 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1116 skb_queue_empty(&rx->sta->ps_tx_buf);
1117
1118 if (skb) {
1119 struct ieee80211_hdr *hdr =
1120 (struct ieee80211_hdr *) skb->data;
1121
4a9a66e9
JB		 1122 /*
1123 * Tell TX path to send one frame even though the STA may
1124 * still remain is PS mode after this frame exchange.
1125 */
07346f81 1126 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67
JB		 1127
1128#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26
JB		 1129 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1130 rx->sta->sta.addr, rx->sta->sta.aid,
571ecf67
JB		 1131 skb_queue_len(&rx->sta->ps_tx_buf));
1132#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1133
1134 /* Use MoreData flag to indicate whether there are more
1135 * buffered frames for this STA */
836341a7 1136 if (no_pending_pkts)
571ecf67 1137 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
836341a7 1138 else
571ecf67
JB		 1139 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1140
1141 dev_queue_xmit(skb);
1142
004c872e
JB		 1143 if (no_pending_pkts)
1144 sta_info_clear_tim_bit(rx->sta);
571ecf67 1145#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
5cf121c3 1146 } else if (!rx->sent_ps_buffered) {
004c872e
JB		 1147 /*
1148 * FIXME: This can be the result of a race condition between
1149 * us expiring a frame and the station polling for it.
1150 * Should we send it a null-func frame indicating we
1151 * have nothing buffered for it?
1152 */
0c68ae26 1153 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
f4ea83dd 1154 "though there are no buffered frames for it\n",
0c68ae26 1155 rx->dev->name, rx->sta->sta.addr);
571ecf67 1156#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
571ecf67
JB		 1157 }
1158
9ae54c84 1159 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1160 * count as an dropped frame. */
1161 dev_kfree_skb(rx->skb);
1162
9ae54c84 1163 return RX_QUEUED;
571ecf67
JB		 1164}
1165
49461622 1166static ieee80211_rx_result debug_noinline
5cf121c3 1167ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1168{
6e0d114d 1169 u8 *data = rx->skb->data;
238f74a2 1170 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1171
238f74a2 1172 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1173 return RX_CONTINUE;
6e0d114d
JB		 1174
1175 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1176 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1177 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1178 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1179 /* change frame type to non QOS */
238f74a2 1180 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1181
9ae54c84 1182 return RX_CONTINUE;
6e0d114d
JB		 1183}
1184
76ee65bf 1185static int
5cf121c3 1186ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1187{
07346f81 1188 if (unlikely(!rx->sta ||
f4ea83dd 1189 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1190 return -EACCES;
571ecf67 1191
76ee65bf 1192 return 0;
571ecf67
JB		 1193}
1194
76ee65bf 1195static int
358c8d9d 1196ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1197{
3017b80b 1198 /*
7848ba7d
JB		 1199 * Pass through unencrypted frames if the hardware has
1200 * decrypted them already.
3017b80b 1201 */
5cf121c3 1202 if (rx->status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1203 return 0;
571ecf67
JB		 1204
1205 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1206 if (unlikely(!ieee80211_has_protected(fc) &&
1207 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1208 ieee80211_is_data(fc) &&
b3fc9c6c 1209 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1210 return -EACCES;
f2ca3ea4
JM		 1211 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1212 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1213 rx->key))
1214 return -EACCES;
1215 /* BIP does not use Protected field, so need to check MMIE */
1216 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb)
1217 && ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1218 rx->key))
1219 return -EACCES;
1220 /*
1221 * When using MFP, Action frames are not allowed prior to
1222 * having configured keys.
1223 */
1224 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1225 ieee80211_is_robust_mgmt_frame(
1226 (struct ieee80211_hdr *) rx->skb->data)))
1227 return -EACCES;
1228 }
b3fc9c6c 1229
76ee65bf 1230 return 0;
571ecf67
JB		 1231}
1232
76ee65bf 1233static int
e31a16d6 1234__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67
JB		 1235{
1236 struct net_device *dev = rx->dev;
571ecf67
JB		 1237 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1238
e31a16d6 1239 return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
76ee65bf 1240}
571ecf67 1241
ce3edf6d
JB		 1242/*
1243 * requires that rx->skb is a frame with ethernet header
1244 */
358c8d9d 1245static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1246{
c97c23e3 1247 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1248 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1249 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1250
1251 /*
1252 * Allow EAPOL frames to us/the PAE group address regardless
1253 * of whether the frame was encrypted or not.
1254 */
1255 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1256 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1257 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1258 return true;
1259
1260 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1261 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1262 return false;
1263
1264 return true;
1265}
1266
1267/*
1268 * requires that rx->skb is a frame with ethernet header
1269 */
76ee65bf 1270static void
5cf121c3 1271ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf
RR		 1272{
1273 struct net_device *dev = rx->dev;
1274 struct ieee80211_local *local = rx->local;
1275 struct sk_buff *skb, *xmit_skb;
1276 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ce3edf6d
JB		 1277 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1278 struct sta_info *dsta;
571ecf67 1279
76ee65bf
RR		 1280 skb = rx->skb;
1281 xmit_skb = NULL;
571ecf67 1282
05c914fe
JB		 1283 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1284 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1285 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
5cf121c3 1286 (rx->flags & IEEE80211_RX_RA_MATCH)) {
ce3edf6d
JB		 1287 if (is_multicast_ether_addr(ehdr->h_dest)) {
1288 /*
1289 * send multicast frames both to higher layers in
1290 * local net stack and back to the wireless medium
1291 */
76ee65bf
RR		 1292 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1293 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1294 printk(KERN_DEBUG "%s: failed to clone "
1295 "multicast frame\n", dev->name);
1296 } else {
571ecf67 1297 dsta = sta_info_get(local, skb->data);
d0709a65 1298 if (dsta && dsta->sdata->dev == dev) {
ce3edf6d
JB		 1299 /*
1300 * The destination station is associated to
1301 * this AP (in this VLAN), so send the frame
1302 * directly to it and do not pass it to local
1303 * net stack.
571ecf67 1304 */
76ee65bf 1305 xmit_skb = skb;
571ecf67
JB		 1306 skb = NULL;
1307 }
571ecf67
JB		 1308 }
1309 }
1310
1311 if (skb) {
d1c3a37c
JB		 1312 int align __maybe_unused;
1313
1314#if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1315 /*
1316 * 'align' will only take the values 0 or 2 here
1317 * since all frames are required to be aligned
1318 * to 2-byte boundaries when being passed to
1319 * mac80211. That also explains the __skb_push()
1320 * below.
1321 */
dacb6f1d 1322 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1323 if (align) {
1324 if (WARN_ON(skb_headroom(skb) < 3)) {
1325 dev_kfree_skb(skb);
1326 skb = NULL;
1327 } else {
1328 u8 *data = skb->data;
1329 size_t len = skb->len;
1330 u8 *new = __skb_push(skb, align);
1331 memmove(new, data, len);
1332 __skb_trim(skb, len);
1333 }
1334 }
1335#endif
1336
1337 if (skb) {
1338 /* deliver to local stack */
1339 skb->protocol = eth_type_trans(skb, dev);
1340 memset(skb->cb, 0, sizeof(skb->cb));
1341 netif_rx(skb);
1342 }
571ecf67
JB		 1343 }
1344
76ee65bf 1345 if (xmit_skb) {
571ecf67 1346 /* send to wireless media */
f831e909 1347 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1348 skb_reset_network_header(xmit_skb);
1349 skb_reset_mac_header(xmit_skb);
76ee65bf 1350 dev_queue_xmit(xmit_skb);
571ecf67 1351 }
76ee65bf
RR		 1352}
1353
49461622 1354static ieee80211_rx_result debug_noinline
5cf121c3 1355ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f
RR		 1356{
1357 struct net_device *dev = rx->dev;
1358 struct ieee80211_local *local = rx->local;
358c8d9d 1359 u16 ethertype;
fd4c7f2f
RR		 1360 u8 *payload;
1361 struct sk_buff *skb = rx->skb, *frame = NULL;
358c8d9d
HH		 1362 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1363 __le16 fc = hdr->frame_control;
fd4c7f2f
RR		 1364 const struct ethhdr *eth;
1365 int remaining, err;
1366 u8 dst[ETH_ALEN];
1367 u8 src[ETH_ALEN];
fd4c7f2f 1368
358c8d9d 1369 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1370 return RX_CONTINUE;
fd4c7f2f 1371
358c8d9d 1372 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1373 return RX_DROP_MONITOR;
fd4c7f2f 1374
5cf121c3 1375 if (!(rx->flags & IEEE80211_RX_AMSDU))
9ae54c84 1376 return RX_CONTINUE;
fd4c7f2f 1377
e31a16d6 1378 err = __ieee80211_data_to_8023(rx);
fd4c7f2f 1379 if (unlikely(err))
e4c26add 1380 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1381
1382 skb->dev = dev;
1383
1384 dev->stats.rx_packets++;
1385 dev->stats.rx_bytes += skb->len;
1386
1387 /* skip the wrapping header */
1388 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1389 if (!eth)
e4c26add 1390 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1391
1392 while (skb != frame) {
1393 u8 padding;
1394 __be16 len = eth->h_proto;
1395 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1396
1397 remaining = skb->len;
1398 memcpy(dst, eth->h_dest, ETH_ALEN);
1399 memcpy(src, eth->h_source, ETH_ALEN);
1400
1401 padding = ((4 - subframe_len) & 0x3);
1402 /* the last MSDU has no padding */
f4ea83dd 1403 if (subframe_len > remaining)
e4c26add 1404 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1405
1406 skb_pull(skb, sizeof(struct ethhdr));
1407 /* if last subframe reuse skb */
1408 if (remaining <= subframe_len + padding)
1409 frame = skb;
1410 else {
d1c3a37c
JB		 1411 /*
1412 * Allocate and reserve two bytes more for payload
1413 * alignment since sizeof(struct ethhdr) is 14.
1414 */
1415 frame = dev_alloc_skb(
1416 ALIGN(local->hw.extra_tx_headroom, 4) +
1417 subframe_len + 2);
fd4c7f2f
RR		 1418
1419 if (frame == NULL)
e4c26add 1420 return RX_DROP_UNUSABLE;
fd4c7f2f 1421
d1c3a37c
JB		 1422 skb_reserve(frame,
1423 ALIGN(local->hw.extra_tx_headroom, 4) +
1424 sizeof(struct ethhdr) + 2);
fd4c7f2f
RR		 1425 memcpy(skb_put(frame, ntohs(len)), skb->data,
1426 ntohs(len));
1427
1428 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1429 padding);
1430 if (!eth) {
fd4c7f2f 1431 dev_kfree_skb(frame);
e4c26add 1432 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1433 }
1434 }
1435
ce3edf6d 1436 skb_reset_network_header(frame);
fd4c7f2f
RR		 1437 frame->dev = dev;
1438 frame->priority = skb->priority;
1439 rx->skb = frame;
1440
fd4c7f2f
RR		 1441 payload = frame->data;
1442 ethertype = (payload[6] << 8) | payload[7];
1443
1444 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
ce3edf6d
JB		 1445 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1446 compare_ether_addr(payload,
1447 bridge_tunnel_header) == 0)) {
fd4c7f2f
RR		 1448 /* remove RFC1042 or Bridge-Tunnel
1449 * encapsulation and replace EtherType */
1450 skb_pull(frame, 6);
1451 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1452 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1453 } else {
ce3edf6d
JB		 1454 memcpy(skb_push(frame, sizeof(__be16)),
1455 &len, sizeof(__be16));
fd4c7f2f
RR		 1456 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1457 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1458 }
1459
358c8d9d 1460 if (!ieee80211_frame_allowed(rx, fc)) {
ce3edf6d 1461 if (skb == frame) /* last frame */
e4c26add 1462 return RX_DROP_UNUSABLE;
ce3edf6d
JB		 1463 dev_kfree_skb(frame);
1464 continue;
1465 }
fd4c7f2f
RR		 1466
1467 ieee80211_deliver_skb(rx);
1468 }
1469
9ae54c84 1470 return RX_QUEUED;
fd4c7f2f
RR		 1471}
1472
bf94e17b 1473#ifdef CONFIG_MAC80211_MESH
b0dee578 1474static ieee80211_rx_result
e32f85f7
LCC		 1475ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1476{
1477 struct ieee80211_hdr *hdr;
1478 struct ieee80211s_hdr *mesh_hdr;
1479 unsigned int hdrlen;
1480 struct sk_buff *skb = rx->skb, *fwd_skb;
1481
1482 hdr = (struct ieee80211_hdr *) skb->data;
1483 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1484 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1485
1486 if (!ieee80211_is_data(hdr->frame_control))
1487 return RX_CONTINUE;
1488
1489 if (!mesh_hdr->ttl)
1490 /* illegal frame */
1491 return RX_DROP_MONITOR;
1492
79617dee
Y		 1493 if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1494 struct ieee80211_sub_if_data *sdata;
1495 struct mesh_path *mppath;
1496
1497 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1498 rcu_read_lock();
1499 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1500 if (!mppath) {
1501 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1502 } else {
1503 spin_lock_bh(&mppath->state_lock);
1504 mppath->exp_time = jiffies;
1505 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1506 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1507 spin_unlock_bh(&mppath->state_lock);
1508 }
1509 rcu_read_unlock();
1510 }
1511
e32f85f7
LCC		 1512 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1513 return RX_CONTINUE;
1514
1515 mesh_hdr->ttl--;
1516
1517 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1518 if (!mesh_hdr->ttl)
472dbc45 1519 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1520 dropped_frames_ttl);
1521 else {
1522 struct ieee80211_hdr *fwd_hdr;
1523 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1524
1525 if (!fwd_skb && net_ratelimit())
1526 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1527 rx->dev->name);
1528
1529 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1530 /*
1531 * Save TA to addr1 to send TA a path error if a
1532 * suitable next hop is not found
1533 */
1534 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1535 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1536 fwd_skb->dev = rx->local->mdev;
1537 fwd_skb->iif = rx->dev->ifindex;
1538 dev_queue_xmit(fwd_skb);
1539 }
1540 }
1541
1542 if (is_multicast_ether_addr(hdr->addr3) ||
1543 rx->dev->flags & IFF_PROMISC)
1544 return RX_CONTINUE;
1545 else
1546 return RX_DROP_MONITOR;
1547}
bf94e17b 1548#endif
e32f85f7 1549
49461622 1550static ieee80211_rx_result debug_noinline
5cf121c3 1551ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf
RR		 1552{
1553 struct net_device *dev = rx->dev;
358c8d9d
HH		 1554 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1555 __le16 fc = hdr->frame_control;
ce3edf6d 1556 int err;
76ee65bf 1557
358c8d9d 1558 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1559 return RX_CONTINUE;
76ee65bf 1560
358c8d9d 1561 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1562 return RX_DROP_MONITOR;
76ee65bf 1563
e31a16d6 1564 err = __ieee80211_data_to_8023(rx);
76ee65bf 1565 if (unlikely(err))
e4c26add 1566 return RX_DROP_UNUSABLE;
76ee65bf 1567
358c8d9d 1568 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1569 return RX_DROP_MONITOR;
ce3edf6d 1570
76ee65bf
RR		 1571 rx->skb->dev = dev;
1572
1573 dev->stats.rx_packets++;
1574 dev->stats.rx_bytes += rx->skb->len;
1575
1576 ieee80211_deliver_skb(rx);
571ecf67 1577
9ae54c84 1578 return RX_QUEUED;
571ecf67
JB		 1579}
1580
49461622 1581static ieee80211_rx_result debug_noinline
5cf121c3 1582ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 1583{
1584 struct ieee80211_local *local = rx->local;
1585 struct ieee80211_hw *hw = &local->hw;
1586 struct sk_buff *skb = rx->skb;
a7767f95 1587 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1588 struct tid_ampdu_rx *tid_agg_rx;
1589 u16 start_seq_num;
1590 u16 tid;
1591
a7767f95 1592 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1593 return RX_CONTINUE;
71364716 1594
a7767f95 1595 if (ieee80211_is_back_req(bar->frame_control)) {
71364716 1596 if (!rx->sta)
9ae54c84 1597 return RX_CONTINUE;
71364716 1598 tid = le16_to_cpu(bar->control) >> 12;
cee24a3e
RR		 1599 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1600 != HT_AGG_STATE_OPERATIONAL)
9ae54c84 1601 return RX_CONTINUE;
cee24a3e 1602 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
71364716
RR		 1603
1604 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1605
1606 /* reset session timer */
20ad19d0
JB		 1607 if (tid_agg_rx->timeout)
1608 mod_timer(&tid_agg_rx->session_timer,
1609 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716
RR		 1610
1611 /* manage reordering buffer according to requested */
1612 /* sequence number */
1613 rcu_read_lock();
f1d58c25 1614 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
71364716
RR		 1615 start_seq_num, 1);
1616 rcu_read_unlock();
e4c26add 1617 return RX_DROP_UNUSABLE;
71364716
RR		 1618 }
1619
9ae54c84 1620 return RX_CONTINUE;
71364716
RR		 1621}
1622
f4f727a6
JM		 1623static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1624 struct ieee80211_mgmt *mgmt,
1625 size_t len)
fea14732
JM		 1626{
1627 struct ieee80211_local *local = sdata->local;
1628 struct sk_buff *skb;
1629 struct ieee80211_mgmt *resp;
1630
1631 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1632 /* Not to own unicast address */
1633 return;
1634 }
1635
46900298
JB		 1636 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1637 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 1638 /* Not from the current AP or not associated yet. */
fea14732
JM		 1639 return;
1640 }
1641
1642 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1643 /* Too short SA Query request frame */
1644 return;
1645 }
1646
1647 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1648 if (skb == NULL)
1649 return;
1650
1651 skb_reserve(skb, local->hw.extra_tx_headroom);
1652 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1653 memset(resp, 0, 24);
1654 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1655 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
46900298 1656 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 1657 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1658 IEEE80211_STYPE_ACTION);
1659 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1660 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1661 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1662 memcpy(resp->u.action.u.sa_query.trans_id,
1663 mgmt->u.action.u.sa_query.trans_id,
1664 WLAN_SA_QUERY_TR_ID_LEN);
1665
1666 ieee80211_tx_skb(sdata, skb, 1);
1667}
1668
de1ede7a
JB		 1669static ieee80211_rx_result debug_noinline
1670ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1671{
1672 struct ieee80211_local *local = rx->local;
1673 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1674 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1675 int len = rx->skb->len;
1676
1677 if (!ieee80211_is_action(mgmt->frame_control))
1678 return RX_CONTINUE;
1679
1680 if (!rx->sta)
1681 return RX_DROP_MONITOR;
1682
1683 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1684 return RX_DROP_MONITOR;
1685
97ebe12a
JM		 1686 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1687 return RX_DROP_MONITOR;
1688
de1ede7a
JB		 1689 /* all categories we currently handle have action_code */
1690 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1691 return RX_DROP_MONITOR;
1692
de1ede7a
JB		 1693 switch (mgmt->u.action.category) {
1694 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 1695 /*
1696 * The aggregation code is not prepared to handle
1697 * anything but STA/AP due to the BSSID handling;
1698 * IBSS could work in the code but isn't supported
1699 * by drivers or the standard.
1700 */
1701 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1702 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1703 sdata->vif.type != NL80211_IFTYPE_AP)
1704 return RX_DROP_MONITOR;
1705
de1ede7a
JB		 1706 switch (mgmt->u.action.u.addba_req.action_code) {
1707 case WLAN_ACTION_ADDBA_REQ:
1708 if (len < (IEEE80211_MIN_ACTION_SIZE +
1709 sizeof(mgmt->u.action.u.addba_req)))
1710 return RX_DROP_MONITOR;
1711 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1712 break;
1713 case WLAN_ACTION_ADDBA_RESP:
1714 if (len < (IEEE80211_MIN_ACTION_SIZE +
1715 sizeof(mgmt->u.action.u.addba_resp)))
1716 return RX_DROP_MONITOR;
1717 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1718 break;
1719 case WLAN_ACTION_DELBA:
1720 if (len < (IEEE80211_MIN_ACTION_SIZE +
1721 sizeof(mgmt->u.action.u.delba)))
1722 return RX_DROP_MONITOR;
1723 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1724 break;
1725 }
39192c0b
JB		 1726 break;
1727 case WLAN_CATEGORY_SPECTRUM_MGMT:
1728 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1729 return RX_DROP_MONITOR;
46900298
JB		 1730
1731 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1732 return RX_DROP_MONITOR;
1733
39192c0b
JB		 1734 switch (mgmt->u.action.u.measurement.action_code) {
1735 case WLAN_ACTION_SPCT_MSR_REQ:
1736 if (len < (IEEE80211_MIN_ACTION_SIZE +
1737 sizeof(mgmt->u.action.u.measurement)))
1738 return RX_DROP_MONITOR;
1739 ieee80211_process_measurement_req(sdata, mgmt, len);
1740 break;
c481ec97
S		 1741 case WLAN_ACTION_SPCT_CHL_SWITCH:
1742 if (len < (IEEE80211_MIN_ACTION_SIZE +
1743 sizeof(mgmt->u.action.u.chan_switch)))
1744 return RX_DROP_MONITOR;
1745
cc32abd4
JB		 1746 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1747 return RX_DROP_MONITOR;
1748
46900298 1749 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
c481ec97
S		 1750 return RX_DROP_MONITOR;
1751
77fdaa12 1752 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
39192c0b
JB		 1753 }
1754 break;
fea14732
JM		 1755 case WLAN_CATEGORY_SA_QUERY:
1756 if (len < (IEEE80211_MIN_ACTION_SIZE +
1757 sizeof(mgmt->u.action.u.sa_query)))
1758 return RX_DROP_MONITOR;
1759 switch (mgmt->u.action.u.sa_query.action) {
1760 case WLAN_ACTION_SA_QUERY_REQUEST:
1761 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1762 return RX_DROP_MONITOR;
1763 ieee80211_process_sa_query_req(sdata, mgmt, len);
1764 break;
1765 case WLAN_ACTION_SA_QUERY_RESPONSE:
1766 /*
1767 * SA Query response is currently only used in AP mode
1768 * and it is processed in user space.
1769 */
1770 return RX_CONTINUE;
1771 }
1772 break;
39192c0b
JB		 1773 default:
1774 return RX_CONTINUE;
de1ede7a
JB		 1775 }
1776
39192c0b
JB		 1777 rx->sta->rx_packets++;
1778 dev_kfree_skb(rx->skb);
1779 return RX_QUEUED;
de1ede7a
JB		 1780}
1781
49461622 1782static ieee80211_rx_result debug_noinline
5cf121c3 1783ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 1784{
759ef3eb 1785 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
97ebe12a 1786 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
571ecf67 1787
5cf121c3 1788 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
e4c26add 1789 return RX_DROP_MONITOR;
571ecf67 1790
97ebe12a
JM		 1791 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1792 return RX_DROP_MONITOR;
1793
472dbc45 1794 if (ieee80211_vif_is_mesh(&sdata->vif))
f1d58c25 1795 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
472dbc45 1796
3832c287 1797 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
f1d58c25 1798 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
f9d540ee 1799
7986cf95 1800 if (sdata->vif.type == NL80211_IFTYPE_STATION)
f1d58c25 1801 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
46900298 1802
7986cf95 1803 return RX_DROP_MONITOR;
571ecf67
JB		 1804}
1805
571ecf67
JB		 1806static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1807 struct ieee80211_hdr *hdr,
5cf121c3 1808 struct ieee80211_rx_data *rx)
571ecf67 1809{
a7767f95
HH		 1810 int keyidx;
1811 unsigned int hdrlen;
571ecf67 1812
a7767f95 1813 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 1814 if (rx->skb->len >= hdrlen + 4)
1815 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1816 else
1817 keyidx = -1;
1818
8944b79f 1819 if (!rx->sta) {
aa0daf0e
JB		 1820 /*
1821 * Some hardware seem to generate incorrect Michael MIC
1822 * reports; ignore them to avoid triggering countermeasures.
1823 */
571ecf67
JB		 1824 goto ignore;
1825 }
1826
a7767f95 1827 if (!ieee80211_has_protected(hdr->frame_control))
571ecf67 1828 goto ignore;
571ecf67 1829
05c914fe 1830 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
aa0daf0e
JB		 1831 /*
1832 * APs with pairwise keys should never receive Michael MIC
1833 * errors for non-zero keyidx because these are reserved for
1834 * group keys and only the AP is sending real multicast
1835 * frames in the BSS.
1836 */
eb063c17 1837 goto ignore;
571ecf67
JB		 1838 }
1839
a7767f95
HH		 1840 if (!ieee80211_is_data(hdr->frame_control) &&
1841 !ieee80211_is_auth(hdr->frame_control))
571ecf67 1842 goto ignore;
571ecf67 1843
e6d6e342
JB		 1844 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
1845 GFP_ATOMIC);
571ecf67
JB		 1846 ignore:
1847 dev_kfree_skb(rx->skb);
1848 rx->skb = NULL;
1849}
1850
5cf121c3
JB		 1851/* TODO: use IEEE80211_RX_FRAGMENTED */
1852static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
3d30d949
MW		 1853{
1854 struct ieee80211_sub_if_data *sdata;
1855 struct ieee80211_local *local = rx->local;
1856 struct ieee80211_rtap_hdr {
1857 struct ieee80211_radiotap_header hdr;
1858 u8 flags;
1859 u8 rate;
1860 __le16 chan_freq;
1861 __le16 chan_flags;
1862 } __attribute__ ((packed)) *rthdr;
1863 struct sk_buff *skb = rx->skb, *skb2;
1864 struct net_device *prev_dev = NULL;
5cf121c3 1865 struct ieee80211_rx_status *status = rx->status;
3d30d949 1866
5cf121c3 1867 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
3d30d949
MW		 1868 goto out_free_skb;
1869
1870 if (skb_headroom(skb) < sizeof(*rthdr) &&
1871 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1872 goto out_free_skb;
1873
1874 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1875 memset(rthdr, 0, sizeof(*rthdr));
1876 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1877 rthdr->hdr.it_present =
1878 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1879 (1 << IEEE80211_RADIOTAP_RATE) |
1880 (1 << IEEE80211_RADIOTAP_CHANNEL));
1881
5cf121c3 1882 rthdr->rate = rx->rate->bitrate / 5;
3d30d949
MW		 1883 rthdr->chan_freq = cpu_to_le16(status->freq);
1884
1885 if (status->band == IEEE80211_BAND_5GHZ)
1886 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1887 IEEE80211_CHAN_5GHZ);
1888 else
1889 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1890 IEEE80211_CHAN_2GHZ);
1891
1892 skb_set_mac_header(skb, 0);
1893 skb->ip_summed = CHECKSUM_UNNECESSARY;
1894 skb->pkt_type = PACKET_OTHERHOST;
1895 skb->protocol = htons(ETH_P_802_2);
1896
1897 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1898 if (!netif_running(sdata->dev))
1899 continue;
1900
05c914fe 1901 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 1902 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1903 continue;
1904
1905 if (prev_dev) {
1906 skb2 = skb_clone(skb, GFP_ATOMIC);
1907 if (skb2) {
1908 skb2->dev = prev_dev;
1909 netif_rx(skb2);
1910 }
1911 }
1912
1913 prev_dev = sdata->dev;
1914 sdata->dev->stats.rx_packets++;
1915 sdata->dev->stats.rx_bytes += skb->len;
1916 }
1917
1918 if (prev_dev) {
1919 skb->dev = prev_dev;
1920 netif_rx(skb);
1921 skb = NULL;
1922 } else
1923 goto out_free_skb;
1924
5cf121c3 1925 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
3d30d949
MW		 1926 return;
1927
1928 out_free_skb:
1929 dev_kfree_skb(skb);
1930}
1931
571ecf67 1932
8944b79f 1933static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
5cf121c3 1934 struct ieee80211_rx_data *rx,
8944b79f 1935 struct sk_buff *skb)
58905290 1936{
58905290
JB		 1937 ieee80211_rx_result res = RX_DROP_MONITOR;
1938
8944b79f
JB		 1939 rx->skb = skb;
1940 rx->sdata = sdata;
1941 rx->dev = sdata->dev;
1942
e32f85f7
LCC		 1943#define CALL_RXH(rxh) \
1944 do { \
1945 res = rxh(rx); \
1946 if (res != RX_CONTINUE) \
1947 goto rxh_done; \
1948 } while (0);
49461622
JB		 1949
1950 CALL_RXH(ieee80211_rx_h_passive_scan)
1951 CALL_RXH(ieee80211_rx_h_check)
1952 CALL_RXH(ieee80211_rx_h_decrypt)
572e0012 1953 CALL_RXH(ieee80211_rx_h_check_more_data)
49461622
JB		 1954 CALL_RXH(ieee80211_rx_h_sta_process)
1955 CALL_RXH(ieee80211_rx_h_defragment)
1956 CALL_RXH(ieee80211_rx_h_ps_poll)
1957 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1958 /* must be after MMIC verify so header is counted in MPDU mic */
1959 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1960 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 1961#ifdef CONFIG_MAC80211_MESH
e32f85f7
LCC		 1962 if (ieee80211_vif_is_mesh(&sdata->vif))
1963 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 1964#endif
49461622
JB		 1965 CALL_RXH(ieee80211_rx_h_data)
1966 CALL_RXH(ieee80211_rx_h_ctrl)
de1ede7a 1967 CALL_RXH(ieee80211_rx_h_action)
49461622
JB		 1968 CALL_RXH(ieee80211_rx_h_mgmt)
1969
1970#undef CALL_RXH
1971
1972 rxh_done:
58905290
JB		 1973 switch (res) {
1974 case RX_DROP_MONITOR:
49461622
JB		 1975 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1976 if (rx->sta)
1977 rx->sta->rx_dropped++;
1978 /* fall through */
1979 case RX_CONTINUE:
3d30d949
MW		 1980 ieee80211_rx_cooked_monitor(rx);
1981 break;
58905290 1982 case RX_DROP_UNUSABLE:
49461622
JB		 1983 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1984 if (rx->sta)
1985 rx->sta->rx_dropped++;
58905290
JB		 1986 dev_kfree_skb(rx->skb);
1987 break;
49461622
JB		 1988 case RX_QUEUED:
1989 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1990 break;
58905290
JB		 1991 }
1992}
1993
571ecf67
JB		 1994/* main receive path */
1995
23a24def 1996static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
7ab17c45 1997 struct ieee80211_rx_data *rx,
23a24def
JB		 1998 struct ieee80211_hdr *hdr)
1999{
7ab17c45 2000 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
23a24def
JB		 2001 int multicast = is_multicast_ether_addr(hdr->addr1);
2002
51fb61e7 2003 switch (sdata->vif.type) {
05c914fe 2004 case NL80211_IFTYPE_STATION:
23a24def
JB		 2005 if (!bssid)
2006 return 0;
77fdaa12
JB		 2007 if (!multicast &&
2008 compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) {
4150c572 2009 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2010 return 0;
5cf121c3 2011 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2012 }
2013 break;
05c914fe 2014 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2015 if (!bssid)
2016 return 0;
a7767f95 2017 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2018 return 1;
87291c02 2019 }
46900298 2020 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
5cf121c3 2021 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 2022 return 0;
5cf121c3 2023 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2024 } else if (!multicast &&
2025 compare_ether_addr(sdata->dev->dev_addr,
2026 hdr->addr1) != 0) {
4150c572 2027 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2028 return 0;
5cf121c3 2029 rx->flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2030 } else if (!rx->sta) {
2031 int rate_idx;
2032 if (rx->status->flag & RX_FLAG_HT)
2033 rate_idx = 0; /* TODO: HT rates */
2034 else
2035 rate_idx = rx->status->rate_idx;
ab1f5c0b 2036 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
0fb8ca45
JM		 2037 BIT(rate_idx));
2038 }
23a24def 2039 break;
05c914fe 2040 case NL80211_IFTYPE_MESH_POINT:
6032f934
JB		 2041 if (!multicast &&
2042 compare_ether_addr(sdata->dev->dev_addr,
2043 hdr->addr1) != 0) {
2044 if (!(sdata->dev->flags & IFF_PROMISC))
2045 return 0;
2046
5cf121c3 2047 rx->flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2048 }
2049 break;
05c914fe
JB		 2050 case NL80211_IFTYPE_AP_VLAN:
2051 case NL80211_IFTYPE_AP:
23a24def
JB		 2052 if (!bssid) {
2053 if (compare_ether_addr(sdata->dev->dev_addr,
2054 hdr->addr1))
2055 return 0;
2056 } else if (!ieee80211_bssid_match(bssid,
2057 sdata->dev->dev_addr)) {
5cf121c3 2058 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 2059 return 0;
5cf121c3 2060 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2061 }
23a24def 2062 break;
05c914fe 2063 case NL80211_IFTYPE_WDS:
a7767f95 2064 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2065 return 0;
2066 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2067 return 0;
2068 break;
05c914fe 2069 case NL80211_IFTYPE_MONITOR:
fb1c1cd6
JB		 2070 /* take everything */
2071 break;
05c914fe
JB		 2072 case NL80211_IFTYPE_UNSPECIFIED:
2073 case __NL80211_IFTYPE_AFTER_LAST:
fb1c1cd6
JB		 2074 /* should never get here */
2075 WARN_ON(1);
2076 break;
23a24def
JB		 2077 }
2078
2079 return 1;
2080}
2081
571ecf67 2082/*
6368e4b1
RR		 2083 * This is the actual Rx frames handler. as it blongs to Rx path it must
2084 * be called with rcu_read_lock protection.
571ecf67 2085 */
71ebb4aa
RR		 2086static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2087 struct sk_buff *skb,
8318d78a 2088 struct ieee80211_rate *rate)
571ecf67 2089{
f1d58c25 2090 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2091 struct ieee80211_local *local = hw_to_local(hw);
2092 struct ieee80211_sub_if_data *sdata;
571ecf67 2093 struct ieee80211_hdr *hdr;
5cf121c3 2094 struct ieee80211_rx_data rx;
6368e4b1 2095 int prepares;
8e6f0032
JB		 2096 struct ieee80211_sub_if_data *prev = NULL;
2097 struct sk_buff *skb_new;
571ecf67 2098
358c8d9d 2099 hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 2100 memset(&rx, 0, sizeof(rx));
2101 rx.skb = skb;
2102 rx.local = local;
2103
5cf121c3 2104 rx.status = status;
5cf121c3 2105 rx.rate = rate;
72abd81b 2106
358c8d9d 2107 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
571ecf67 2108 local->dot11ReceivedFragmentCount++;
571ecf67 2109
8944b79f
JB		 2110 rx.sta = sta_info_get(local, hdr->addr2);
2111 if (rx.sta) {
d0709a65
JB		 2112 rx.sdata = rx.sta->sdata;
2113 rx.dev = rx.sta->sdata->dev;
b2e7771e 2114 }
571ecf67 2115
571ecf67 2116 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
8944b79f 2117 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
d0709a65 2118 return;
571ecf67
JB		 2119 }
2120
c2b13452 2121 if (unlikely(local->sw_scanning || local->hw_scanning))
5cf121c3 2122 rx.flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2123
38f3714d 2124 ieee80211_parse_qos(&rx);
d1c3a37c 2125 ieee80211_verify_alignment(&rx);
38f3714d 2126
571ecf67
JB		 2127 skb = rx.skb;
2128
79010420 2129 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2a8a9a88
JB		 2130 if (!netif_running(sdata->dev))
2131 continue;
2132
05c914fe 2133 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 2134 continue;
2135
5cf121c3 2136 rx.flags |= IEEE80211_RX_RA_MATCH;
7ab17c45 2137 prepares = prepare_for_handlers(sdata, &rx, hdr);
23a24def 2138
6368e4b1 2139 if (!prepares)
23a24def 2140 continue;
8e6f0032 2141
340e11f3
JB		 2142 /*
2143 * frame is destined for this interface, but if it's not
2144 * also for the previous one we handle that after the
2145 * loop to avoid copying the SKB once too much
2146 */
2147
2148 if (!prev) {
2149 prev = sdata;
2150 continue;
8e6f0032 2151 }
340e11f3
JB		 2152
2153 /*
2154 * frame was destined for the previous interface
2155 * so invoke RX handlers for it
2156 */
2157
2158 skb_new = skb_copy(skb, GFP_ATOMIC);
2159 if (!skb_new) {
2160 if (net_ratelimit())
2161 printk(KERN_DEBUG "%s: failed to copy "
a4278e18 2162 "multicast frame for %s\n",
dd1cd4c6
JB		 2163 wiphy_name(local->hw.wiphy),
2164 prev->dev->name);
340e11f3
JB		 2165 continue;
2166 }
8944b79f 2167 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
8e6f0032 2168 prev = sdata;
571ecf67 2169 }
a4b7d7bd 2170 if (prev)
8944b79f 2171 ieee80211_invoke_rx_handlers(prev, &rx, skb);
a4b7d7bd 2172 else
8e6f0032 2173 dev_kfree_skb(skb);
571ecf67 2174}
6368e4b1 2175
b580781e
RR		 2176#define SEQ_MODULO 0x1000
2177#define SEQ_MASK 0xfff
2178
2179static inline int seq_less(u16 sq1, u16 sq2)
2180{
c6a1fa12 2181 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
b580781e
RR		 2182}
2183
2184static inline u16 seq_inc(u16 sq)
2185{
c6a1fa12 2186 return (sq + 1) & SEQ_MASK;
b580781e
RR		 2187}
2188
2189static inline u16 seq_sub(u16 sq1, u16 sq2)
2190{
c6a1fa12 2191 return (sq1 - sq2) & SEQ_MASK;
b580781e
RR		 2192}
2193
2194
2d3babd1
JM		 2195static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
2196 struct tid_ampdu_rx *tid_agg_rx,
2197 int index)
2198{
2199 struct ieee80211_supported_band *sband;
2200 struct ieee80211_rate *rate;
f1d58c25
JB		 2201 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
2202 struct ieee80211_rx_status *status;
2d3babd1 2203
f1d58c25 2204 if (!skb)
2d3babd1
JM		 2205 goto no_frame;
2206
f1d58c25
JB		 2207 status = IEEE80211_SKB_RXCB(skb);
2208
2d3babd1 2209 /* release the reordered frames to stack */
f1d58c25
JB		 2210 sband = hw->wiphy->bands[status->band];
2211 if (status->flag & RX_FLAG_HT)
2d3babd1
JM		 2212 rate = sband->bitrates; /* TODO: HT rates */
2213 else
f1d58c25
JB		 2214 rate = &sband->bitrates[status->rate_idx];
2215 __ieee80211_rx_handle_packet(hw, skb, rate);
2d3babd1
JM		 2216 tid_agg_rx->stored_mpdu_num--;
2217 tid_agg_rx->reorder_buf[index] = NULL;
2218
2219no_frame:
2220 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2221}
2222
2223
4d050f1d
JM		 2224/*
2225 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2226 * the skb was added to the buffer longer than this time ago, the earlier
2227 * frames that have not yet been received are assumed to be lost and the skb
2228 * can be released for processing. This may also release other skb's from the
2229 * reorder buffer if there are no additional gaps between the frames.
2230 */
2231#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2232
71364716
RR		 2233/*
2234 * As it function blongs to Rx path it must be called with
2235 * the proper rcu_read_lock protection for its flow.
2236 */
c6a1fa12
JB		 2237static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2238 struct tid_ampdu_rx *tid_agg_rx,
2239 struct sk_buff *skb,
2240 u16 mpdu_seq_num,
2241 int bar_req)
b580781e 2242{
b580781e
RR		 2243 u16 head_seq_num, buf_size;
2244 int index;
b580781e
RR		 2245
2246 buf_size = tid_agg_rx->buf_size;
2247 head_seq_num = tid_agg_rx->head_seq_num;
2248
2249 /* frame with out of date sequence number */
2250 if (seq_less(mpdu_seq_num, head_seq_num)) {
2251 dev_kfree_skb(skb);
2252 return 1;
2253 }
2254
2255 /* if frame sequence number exceeds our buffering window size or
2256 * block Ack Request arrived - release stored frames */
2257 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2258 /* new head to the ordering buffer */
2259 if (bar_req)
2260 head_seq_num = mpdu_seq_num;
2261 else
2262 head_seq_num =
2263 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2264 /* release stored frames up to new head to stack */
2265 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2266 index = seq_sub(tid_agg_rx->head_seq_num,
2267 tid_agg_rx->ssn)
2268 % tid_agg_rx->buf_size;
2d3babd1
JM		 2269 ieee80211_release_reorder_frame(hw, tid_agg_rx,
2270 index);
b580781e
RR		 2271 }
2272 if (bar_req)
2273 return 1;
2274 }
2275
2276 /* now the new frame is always in the range of the reordering */
2277 /* buffer window */
2278 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2279 % tid_agg_rx->buf_size;
2280 /* check if we already stored this frame */
2281 if (tid_agg_rx->reorder_buf[index]) {
2282 dev_kfree_skb(skb);
2283 return 1;
2284 }
2285
2286 /* if arrived mpdu is in the right order and nothing else stored */
2287 /* release it immediately */
2288 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2289 tid_agg_rx->stored_mpdu_num == 0) {
2290 tid_agg_rx->head_seq_num =
2291 seq_inc(tid_agg_rx->head_seq_num);
2292 return 0;
2293 }
2294
2295 /* put the frame in the reordering buffer */
2296 tid_agg_rx->reorder_buf[index] = skb;
4d050f1d 2297 tid_agg_rx->reorder_time[index] = jiffies;
b580781e
RR		 2298 tid_agg_rx->stored_mpdu_num++;
2299 /* release the buffer until next missing frame */
2300 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2301 % tid_agg_rx->buf_size;
4d050f1d
JM		 2302 if (!tid_agg_rx->reorder_buf[index] &&
2303 tid_agg_rx->stored_mpdu_num > 1) {
2304 /*
2305 * No buffers ready to be released, but check whether any
2306 * frames in the reorder buffer have timed out.
2307 */
2308 int j;
2309 int skipped = 1;
2310 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
2311 j = (j + 1) % tid_agg_rx->buf_size) {
2312 if (tid_agg_rx->reorder_buf[j] == NULL) {
2313 skipped++;
2314 continue;
2315 }
2316 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
2317 HZ / 10))
2318 break;
2319
2320#ifdef CONFIG_MAC80211_HT_DEBUG
2321 if (net_ratelimit())
2322 printk(KERN_DEBUG "%s: release an RX reorder "
2323 "frame due to timeout on earlier "
2324 "frames\n",
2325 wiphy_name(hw->wiphy));
2326#endif
2327 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
2328
2329 /*
2330 * Increment the head seq# also for the skipped slots.
2331 */
2332 tid_agg_rx->head_seq_num =
2333 (tid_agg_rx->head_seq_num + skipped) &
2334 SEQ_MASK;
2335 skipped = 0;
2336 }
2337 } else while (tid_agg_rx->reorder_buf[index]) {
2d3babd1 2338 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
b580781e
RR		 2339 index = seq_sub(tid_agg_rx->head_seq_num,
2340 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2341 }
2342 return 1;
2343}
2344
71ebb4aa 2345static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
f1d58c25 2346 struct sk_buff *skb)
b580781e
RR		 2347{
2348 struct ieee80211_hw *hw = &local->hw;
2349 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2350 struct sta_info *sta;
2351 struct tid_ampdu_rx *tid_agg_rx;
87228f57 2352 u16 sc;
b580781e 2353 u16 mpdu_seq_num;
182503ab 2354 u8 ret = 0;
b580781e
RR		 2355 int tid;
2356
2357 sta = sta_info_get(local, hdr->addr2);
2358 if (!sta)
2359 return ret;
2360
b580781e
RR		 2361 /* filter the QoS data rx stream according to
2362 * STA/TID and check if this STA/TID is on aggregation */
87228f57 2363 if (!ieee80211_is_data_qos(hdr->frame_control))
b580781e
RR		 2364 goto end_reorder;
2365
238f74a2 2366 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
b580781e 2367
cee24a3e 2368 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
b580781e
RR		 2369 goto end_reorder;
2370
cee24a3e
RR		 2371 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2372
2560b6e2
EG		 2373 /* qos null data frames are excluded */
2374 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
b580781e
RR		 2375 goto end_reorder;
2376
2377 /* new un-ordered ampdu frame - process it */
2378
2379 /* reset session timer */
20ad19d0
JB		 2380 if (tid_agg_rx->timeout)
2381 mod_timer(&tid_agg_rx->session_timer,
2382 TU_TO_EXP_TIME(tid_agg_rx->timeout));
b580781e
RR		 2383
2384 /* if this mpdu is fragmented - terminate rx aggregation session */
2385 sc = le16_to_cpu(hdr->seq_ctrl);
2386 if (sc & IEEE80211_SCTL_FRAG) {
17741cdc 2387 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
b580781e
RR		 2388 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2389 ret = 1;
2390 goto end_reorder;
2391 }
2392
2393 /* according to mpdu sequence number deal with reordering buffer */
2394 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
f1d58c25 2395 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
b580781e 2396 mpdu_seq_num, 0);
d0709a65 2397 end_reorder:
b580781e
RR		 2398 return ret;
2399}
2400
6368e4b1
RR		 2401/*
2402 * This is the receive path handler. It is called by a low level driver when an
2403 * 802.11 MPDU is received from the hardware.
2404 */
f1d58c25 2405void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2406{
2407 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2408 struct ieee80211_rate *rate = NULL;
2409 struct ieee80211_supported_band *sband;
f1d58c25 2410 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a
JB		 2411
2412 if (status->band < 0 ||
13d8fd2d 2413 status->band >= IEEE80211_NUM_BANDS) {
8318d78a
JB		 2414 WARN_ON(1);
2415 return;
2416 }
2417
2418 sband = local->hw.wiphy->bands[status->band];
0fb8ca45 2419 if (!sband) {
8318d78a
JB		 2420 WARN_ON(1);
2421 return;
2422 }
2423
0fb8ca45
JM		 2424 if (status->flag & RX_FLAG_HT) {
2425 /* rate_idx is MCS index */
2426 if (WARN_ON(status->rate_idx < 0 ||
2427 status->rate_idx >= 76))
2428 return;
2429 /* HT rates are not in the table - use the highest legacy rate
2430 * for now since other parts of mac80211 may not yet be fully
2431 * MCS aware. */
2432 rate = &sband->bitrates[sband->n_bitrates - 1];
2433 } else {
2434 if (WARN_ON(status->rate_idx < 0 ||
2435 status->rate_idx >= sband->n_bitrates))
2436 return;
2437 rate = &sband->bitrates[status->rate_idx];
2438 }
6368e4b1
RR		 2439
2440 /*
2441 * key references and virtual interfaces are protected using RCU
2442 * and this requires that we are in a read-side RCU section during
2443 * receive processing
2444 */
2445 rcu_read_lock();
2446
2447 /*
2448 * Frames with failed FCS/PLCP checksum are not returned,
2449 * all other frames are returned without radiotap header
2450 * if it was previously present.
2451 * Also, frames with less than 16 bytes are dropped.
2452 */
f1d58c25 2453 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2454 if (!skb) {
2455 rcu_read_unlock();
2456 return;
2457 }
2458
aec67952
JM		 2459 /*
2460 * In theory, the block ack reordering should happen after duplicate
2461 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2462 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2463 * happen as a new RX handler between ieee80211_rx_h_check and
2464 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2465 * the time being, the call can be here since RX reorder buf processing
2466 * will implicitly skip duplicates. We could, in theory at least,
2467 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2468 * frames from other than operational channel), but that should not
2469 * happen in normal networks.
2470 */
f1d58c25
JB		 2471 if (!ieee80211_rx_reorder_ampdu(local, skb))
2472 __ieee80211_rx_handle_packet(hw, skb, rate);
6368e4b1
RR		 2473
2474 rcu_read_unlock();
2475}
571ecf67
JB		 2476EXPORT_SYMBOL(__ieee80211_rx);
2477
2478/* This is a version of the rx handler that can be called from hard irq
2479 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2480void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2481{
2482 struct ieee80211_local *local = hw_to_local(hw);
2483
2484 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2485
2486 skb->dev = local->mdev;
571ecf67
JB		 2487 skb->pkt_type = IEEE80211_RX_MSG;
2488 skb_queue_tail(&local->skb_queue, skb);
2489 tasklet_schedule(&local->tasklet);
2490}
2491EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)