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mac80211: cleanup reorder buffer handling
[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
a02ae758
JB		 30static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
31 struct tid_ampdu_rx *tid_agg_rx,
32 u16 head_seq_num);
33
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,
0869aea0 41 struct sk_buff *skb)
b2e7771e 42{
b2e7771e
JB		 43 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
44 if (likely(skb->len > FCS_LEN))
45 skb_trim(skb, skb->len - FCS_LEN);
46 else {
47 /* driver bug */
48 WARN_ON(1);
49 dev_kfree_skb(skb);
50 skb = NULL;
51 }
52 }
53
54 return skb;
55}
56
f1d58c25 57static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 58 int present_fcs_len)
b2e7771e 59{
f1d58c25 60 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 61 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 62
63 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
64 return 1;
0869aea0 65 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 66 return 1;
87228f57
HH		 67 if (ieee80211_is_ctl(hdr->frame_control) &&
68 !ieee80211_is_pspoll(hdr->frame_control) &&
69 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 70 return 1;
71 return 0;
72}
73
601ae7f2
BR		 74static int
75ieee80211_rx_radiotap_len(struct ieee80211_local *local,
76 struct ieee80211_rx_status *status)
77{
78 int len;
79
80 /* always present fields */
81 len = sizeof(struct ieee80211_radiotap_header) + 9;
82
83 if (status->flag & RX_FLAG_TSFT)
84 len += 8;
7fee5372 85 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2
BR		 86 len += 1;
87 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
88 len += 1;
89
90 if (len & 1) /* padding for RX_FLAGS if necessary */
91 len++;
92
601ae7f2
BR		 93 return len;
94}
95
d1c3a37c 96/*
601ae7f2
BR		 97 * ieee80211_add_rx_radiotap_header - add radiotap header
98 *
99 * add a radiotap header containing all the fields which the hardware provided.
100 */
101static void
102ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
103 struct sk_buff *skb,
601ae7f2
BR		 104 struct ieee80211_rate *rate,
105 int rtap_len)
106{
f1d58c25 107 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 108 struct ieee80211_radiotap_header *rthdr;
109 unsigned char *pos;
6a86b9c7 110 u16 rx_flags = 0;
601ae7f2
BR		 111
112 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
113 memset(rthdr, 0, rtap_len);
114
115 /* radiotap header, set always present flags */
116 rthdr->it_present =
117 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 118 (1 << IEEE80211_RADIOTAP_CHANNEL) |
119 (1 << IEEE80211_RADIOTAP_ANTENNA) |
120 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
121 rthdr->it_len = cpu_to_le16(rtap_len);
122
123 pos = (unsigned char *)(rthdr+1);
124
125 /* the order of the following fields is important */
126
127 /* IEEE80211_RADIOTAP_TSFT */
128 if (status->flag & RX_FLAG_TSFT) {
6a86b9c7 129 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 130 rthdr->it_present |=
131 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
132 pos += 8;
133 }
134
135 /* IEEE80211_RADIOTAP_FLAGS */
136 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
137 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 138 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
139 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 140 if (status->flag & RX_FLAG_SHORTPRE)
141 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 142 pos++;
143
144 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 145 if (status->flag & RX_FLAG_HT) {
146 /*
147 * TODO: add following information into radiotap header once
148 * suitable fields are defined for it:
149 * - MCS index (status->rate_idx)
150 * - HT40 (status->flag & RX_FLAG_40MHZ)
151 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
152 */
153 *pos = 0;
8d6f658e 154 } else {
ebe6c7ba 155 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 156 *pos = rate->bitrate / 5;
8d6f658e 157 }
601ae7f2
BR		 158 pos++;
159
160 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 161 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 162 pos += 2;
163 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 164 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
165 pos);
9deb1ae5 166 else if (rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 167 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
168 pos);
601ae7f2 169 else
6a86b9c7
JB		 170 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
171 pos);
601ae7f2
BR		 172 pos += 2;
173
174 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
175 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
176 *pos = status->signal;
177 rthdr->it_present |=
178 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
179 pos++;
180 }
181
182 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
183 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
184 *pos = status->noise;
185 rthdr->it_present |=
186 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
187 pos++;
188 }
189
190 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
191
192 /* IEEE80211_RADIOTAP_ANTENNA */
193 *pos = status->antenna;
194 pos++;
195
601ae7f2
BR		 196 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
197
198 /* IEEE80211_RADIOTAP_RX_FLAGS */
199 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 200 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 201 pos++;
aae89831 202 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 203 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
204 put_unaligned_le16(rx_flags, pos);
601ae7f2
BR		 205 pos += 2;
206}
207
b2e7771e
JB		 208/*
209 * This function copies a received frame to all monitor interfaces and
210 * returns a cleaned-up SKB that no longer includes the FCS nor the
211 * radiotap header the driver might have added.
212 */
213static struct sk_buff *
214ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 215 struct ieee80211_rate *rate)
b2e7771e 216{
f1d58c25 217 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 218 struct ieee80211_sub_if_data *sdata;
b2e7771e 219 int needed_headroom = 0;
b2e7771e
JB		 220 struct sk_buff *skb, *skb2;
221 struct net_device *prev_dev = NULL;
222 int present_fcs_len = 0;
b2e7771e
JB		 223
224 /*
225 * First, we may need to make a copy of the skb because
226 * (1) we need to modify it for radiotap (if not present), and
227 * (2) the other RX handlers will modify the skb we got.
228 *
229 * We don't need to, of course, if we aren't going to return
230 * the SKB because it has a bad FCS/PLCP checksum.
231 */
0869aea0
JB		 232
233 /* room for the radiotap header based on driver features */
234 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 235
236 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
237 present_fcs_len = FCS_LEN;
238
239 if (!local->monitors) {
0869aea0 240 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 241 dev_kfree_skb(origskb);
242 return NULL;
243 }
244
0869aea0 245 return remove_monitor_info(local, origskb);
b2e7771e
JB		 246 }
247
0869aea0 248 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 249 /* only need to expand headroom if necessary */
250 skb = origskb;
251 origskb = NULL;
252
253 /*
254 * This shouldn't trigger often because most devices have an
255 * RX header they pull before we get here, and that should
256 * be big enough for our radiotap information. We should
257 * probably export the length to drivers so that we can have
258 * them allocate enough headroom to start with.
259 */
260 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 261 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 262 dev_kfree_skb(skb);
263 return NULL;
264 }
265 } else {
266 /*
267 * Need to make a copy and possibly remove radiotap header
268 * and FCS from the original.
269 */
270 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
271
0869aea0 272 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 273
274 if (!skb)
275 return origskb;
276 }
277
0869aea0
JB		 278 /* prepend radiotap information */
279 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 280
ce3edf6d 281 skb_reset_mac_header(skb);
b2e7771e
JB		 282 skb->ip_summed = CHECKSUM_UNNECESSARY;
283 skb->pkt_type = PACKET_OTHERHOST;
284 skb->protocol = htons(ETH_P_802_2);
285
286 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
287 if (!netif_running(sdata->dev))
288 continue;
289
05c914fe 290 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 291 continue;
292
3d30d949
MW		 293 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
294 continue;
295
b2e7771e
JB		 296 if (prev_dev) {
297 skb2 = skb_clone(skb, GFP_ATOMIC);
298 if (skb2) {
299 skb2->dev = prev_dev;
300 netif_rx(skb2);
301 }
302 }
303
304 prev_dev = sdata->dev;
305 sdata->dev->stats.rx_packets++;
306 sdata->dev->stats.rx_bytes += skb->len;
307 }
308
309 if (prev_dev) {
310 skb->dev = prev_dev;
311 netif_rx(skb);
312 } else
313 dev_kfree_skb(skb);
314
315 return origskb;
316}
317
318
5cf121c3 319static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 320{
238f74a2 321 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
6e0d114d
JB		 322 int tid;
323
324 /* does the frame have a qos control field? */
238f74a2
HH		 325 if (ieee80211_is_data_qos(hdr->frame_control)) {
326 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 327 /* frame has qos control */
238f74a2
HH		 328 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
329 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
5cf121c3 330 rx->flags |= IEEE80211_RX_AMSDU;
fd4c7f2f 331 else
5cf121c3 332 rx->flags &= ~IEEE80211_RX_AMSDU;
6e0d114d 333 } else {
1411f9b5
JB		 334 /*
335 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
336 *
337 * Sequence numbers for management frames, QoS data
338 * frames with a broadcast/multicast address in the
339 * Address 1 field, and all non-QoS data frames sent
340 * by QoS STAs are assigned using an additional single
341 * modulo-4096 counter, [...]
342 *
343 * We also use that counter for non-QoS STAs.
344 */
345 tid = NUM_RX_DATA_QUEUES - 1;
6e0d114d 346 }
52865dfd 347
5cf121c3 348 rx->queue = tid;
6e0d114d
JB		 349 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
350 * For now, set skb->priority to 0 for other cases. */
351 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 352}
6e0d114d 353
d1c3a37c
JB		 354/**
355 * DOC: Packet alignment
356 *
357 * Drivers always need to pass packets that are aligned to two-byte boundaries
358 * to the stack.
359 *
360 * Additionally, should, if possible, align the payload data in a way that
361 * guarantees that the contained IP header is aligned to a four-byte
362 * boundary. In the case of regular frames, this simply means aligning the
363 * payload to a four-byte boundary (because either the IP header is directly
364 * contained, or IV/RFC1042 headers that have a length divisible by four are
365 * in front of it).
366 *
367 * With A-MSDU frames, however, the payload data address must yield two modulo
368 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
369 * push the IP header further back to a multiple of four again. Thankfully, the
370 * specs were sane enough this time around to require padding each A-MSDU
371 * subframe to a length that is a multiple of four.
372 *
373 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
374 * the payload is not supported, the driver is required to move the 802.11
375 * header to be directly in front of the payload in that case.
376 */
377static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 378{
a7767f95 379 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
38f3714d
JB		 380 int hdrlen;
381
d1c3a37c
JB		 382#ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
383 return;
384#endif
385
386 if (WARN_ONCE((unsigned long)rx->skb->data & 1,
387 "unaligned packet at 0x%p\n", rx->skb->data))
388 return;
389
a7767f95 390 if (!ieee80211_is_data_present(hdr->frame_control))
38f3714d
JB		 391 return;
392
a7767f95 393 hdrlen = ieee80211_hdrlen(hdr->frame_control);
5cf121c3 394 if (rx->flags & IEEE80211_RX_AMSDU)
38f3714d 395 hdrlen += ETH_HLEN;
d1c3a37c
JB		 396 WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3,
397 "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen);
6e0d114d
JB		 398}
399
6368e4b1 400
571ecf67
JB		 401/* rx handlers */
402
49461622 403static ieee80211_rx_result debug_noinline
5cf121c3 404ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 405{
406 struct ieee80211_local *local = rx->local;
407 struct sk_buff *skb = rx->skb;
408
fbe9c429 409 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
f1d58c25 410 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 411
142b9f50
HS		 412 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) &&
413 (rx->flags & IEEE80211_RX_IN_SCAN))) {
ece8eddd 414 /* drop all the other packets during a software scan anyway */
f1d58c25 415 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
ece8eddd 416 dev_kfree_skb(skb);
9ae54c84 417 return RX_QUEUED;
571ecf67
JB		 418 }
419
5cf121c3 420 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
571ecf67
JB		 421 /* scanning finished during invoking of handlers */
422 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
e4c26add 423 return RX_DROP_UNUSABLE;
571ecf67
JB		 424 }
425
9ae54c84 426 return RX_CONTINUE;
571ecf67
JB		 427}
428
3cfcf6ac
JM		 429
430static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
431{
432 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
433
434 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
435 return 0;
436
437 return ieee80211_is_robust_mgmt_frame(hdr);
438}
439
440
441static int ieee80211_is_multicast_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
452/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
453static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
454{
455 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
456 struct ieee80211_mmie *mmie;
457
458 if (skb->len < 24 + sizeof(*mmie) ||
459 !is_multicast_ether_addr(hdr->da))
460 return -1;
461
462 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
463 return -1; /* not a robust management frame */
464
465 mmie = (struct ieee80211_mmie *)
466 (skb->data + skb->len - sizeof(*mmie));
467 if (mmie->element_id != WLAN_EID_MMIE ||
468 mmie->length != sizeof(*mmie) - 2)
469 return -1;
470
471 return le16_to_cpu(mmie->key_id);
472}
473
474
33b64eb2 475static ieee80211_rx_result
5cf121c3 476ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 477{
a7767f95
HH		 478 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
479 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
3c5772a5 480 char *dev_addr = rx->dev->dev_addr;
d6d1a5a7 481
a7767f95 482 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 483 if (is_multicast_ether_addr(hdr->addr1)) {
484 if (ieee80211_has_tods(hdr->frame_control) ||
485 !ieee80211_has_fromds(hdr->frame_control))
486 return RX_DROP_MONITOR;
487 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
488 return RX_DROP_MONITOR;
489 } else {
490 if (!ieee80211_has_a4(hdr->frame_control))
491 return RX_DROP_MONITOR;
492 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
493 return RX_DROP_MONITOR;
494 }
33b64eb2
LCC		 495 }
496
497 /* If there is not an established peer link and this is not a peer link
498 * establisment frame, beacon or probe, drop the frame.
499 */
500
b4e08ea1 501 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
33b64eb2 502 struct ieee80211_mgmt *mgmt;
d6d1a5a7 503
a7767f95 504 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 505 return RX_DROP_MONITOR;
506
a7767f95 507 if (ieee80211_is_action(hdr->frame_control)) {
33b64eb2 508 mgmt = (struct ieee80211_mgmt *)hdr;
0938393f 509 if (mgmt->u.action.category != MESH_PLINK_CATEGORY)
33b64eb2 510 return RX_DROP_MONITOR;
33b64eb2 511 return RX_CONTINUE;
33b64eb2
LCC		 512 }
513
a7767f95
HH		 514 if (ieee80211_is_probe_req(hdr->frame_control) ||
515 ieee80211_is_probe_resp(hdr->frame_control) ||
516 ieee80211_is_beacon(hdr->frame_control))
517 return RX_CONTINUE;
518
519 return RX_DROP_MONITOR;
520
521 }
522
523#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
524
525 if (ieee80211_is_data(hdr->frame_control) &&
526 is_multicast_ether_addr(hdr->addr1) &&
3c5772a5 527 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
33b64eb2 528 return RX_DROP_MONITOR;
902acc78 529#undef msh_h_get
d6d1a5a7 530
902acc78
JB		 531 return RX_CONTINUE;
532}
33b64eb2
LCC		 533
534
49461622 535static ieee80211_rx_result debug_noinline
5cf121c3 536ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 537{
a7767f95 538 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 539
540 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
541 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 542 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
5cf121c3 543 rx->sta->last_seq_ctrl[rx->queue] ==
571ecf67 544 hdr->seq_ctrl)) {
5cf121c3 545 if (rx->flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 546 rx->local->dot11FrameDuplicateCount++;
547 rx->sta->num_duplicates++;
548 }
e4c26add 549 return RX_DROP_MONITOR;
571ecf67 550 } else
5cf121c3 551 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
571ecf67
JB		 552 }
553
571ecf67
JB		 554 if (unlikely(rx->skb->len < 16)) {
555 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 556 return RX_DROP_MONITOR;
571ecf67
JB		 557 }
558
571ecf67
JB		 559 /* Drop disallowed frame classes based on STA auth/assoc state;
560 * IEEE 802.11, Chap 5.5.
561 *
ccd7b362
JB		 562 * mac80211 filters only based on association state, i.e. it drops
563 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 564 * deauth/disassoc frames when needed. In addition, hostapd is
565 * responsible for filtering on both auth and assoc states.
566 */
33b64eb2 567
902acc78 568 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 569 return ieee80211_rx_mesh_check(rx);
33b64eb2 570
a7767f95
HH		 571 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
572 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 573 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
07346f81 574 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
a7767f95
HH		 575 if ((!ieee80211_has_fromds(hdr->frame_control) &&
576 !ieee80211_has_tods(hdr->frame_control) &&
577 ieee80211_is_data(hdr->frame_control)) ||
578 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
571ecf67
JB		 579 /* Drop IBSS frames and frames for other hosts
580 * silently. */
e4c26add 581 return RX_DROP_MONITOR;
571ecf67
JB		 582 }
583
e4c26add 584 return RX_DROP_MONITOR;
571ecf67
JB		 585 }
586
9ae54c84 587 return RX_CONTINUE;
570bd537
JB		 588}
589
590
49461622 591static ieee80211_rx_result debug_noinline
5cf121c3 592ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 593{
a7767f95 594 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
3017b80b
JB		 595 int keyidx;
596 int hdrlen;
e4c26add 597 ieee80211_rx_result result = RX_DROP_UNUSABLE;
d4e46a3d 598 struct ieee80211_key *stakey = NULL;
3cfcf6ac 599 int mmie_keyidx = -1;
570bd537 600
3017b80b
JB		 601 /*
602 * Key selection 101
603 *
3cfcf6ac 604 * There are four types of keys:
3017b80b 605 * - GTK (group keys)
3cfcf6ac 606 * - IGTK (group keys for management frames)
3017b80b
JB		 607 * - PTK (pairwise keys)
608 * - STK (station-to-station pairwise keys)
609 *
610 * When selecting a key, we have to distinguish between multicast
611 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 612 * use PTKs and STKs while the former always use GTKs and IGTKs.
613 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
614 * unicast frames can also use key indices like GTKs. Hence, if we
615 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 616 *
8dc06a1c
JB		 617 * Note that in a regular BSS, multicast frames are sent by the
618 * AP only, associated stations unicast the frame to the AP first
619 * which then multicasts it on their behalf.
620 *
3017b80b
JB		 621 * There is also a slight problem in IBSS mode: GTKs are negotiated
622 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 623 * The spec seems to expect that one negotiates the same key with
624 * every station but there's no such requirement; VLANs could be
625 * possible.
3017b80b
JB		 626 */
627
3017b80b 628 /*
1990af8d 629 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 630 * addressed to us nor a multicast frame.
631 */
5cf121c3 632 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 633 return RX_CONTINUE;
3017b80b 634
d4e46a3d
JB		 635 if (rx->sta)
636 stakey = rcu_dereference(rx->sta->key);
637
0c7c10c7
JM		 638 if (!ieee80211_has_protected(hdr->frame_control))
639 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
640
d4e46a3d
JB		 641 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
642 rx->key = stakey;
0c7c10c7
JM		 643 /* Skip decryption if the frame is not protected. */
644 if (!ieee80211_has_protected(hdr->frame_control))
645 return RX_CONTINUE;
3cfcf6ac
JM		 646 } else if (mmie_keyidx >= 0) {
647 /* Broadcast/multicast robust management frame / BIP */
648 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
649 (rx->status->flag & RX_FLAG_IV_STRIPPED))
650 return RX_CONTINUE;
651
652 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
653 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
654 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
655 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
0c7c10c7
JM		 656 } else if (!ieee80211_has_protected(hdr->frame_control)) {
657 /*
658 * The frame was not protected, so skip decryption. However, we
659 * need to set rx->key if there is a key that could have been
660 * used so that the frame may be dropped if encryption would
661 * have been expected.
662 */
663 struct ieee80211_key *key = NULL;
664 if (ieee80211_is_mgmt(hdr->frame_control) &&
665 is_multicast_ether_addr(hdr->addr1) &&
666 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
667 rx->key = key;
668 else if ((key = rcu_dereference(rx->sdata->default_key)))
669 rx->key = key;
670 return RX_CONTINUE;
571ecf67 671 } else {
3017b80b
JB		 672 /*
673 * The device doesn't give us the IV so we won't be
674 * able to look up the key. That's ok though, we
675 * don't need to decrypt the frame, we just won't
676 * be able to keep statistics accurate.
677 * Except for key threshold notifications, should
678 * we somehow allow the driver to tell us which key
679 * the hardware used if this flag is set?
680 */
5cf121c3
JB		 681 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
682 (rx->status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 683 return RX_CONTINUE;
3017b80b 684
a7767f95 685 hdrlen = ieee80211_hdrlen(hdr->frame_control);
3017b80b
JB		 686
687 if (rx->skb->len < 8 + hdrlen)
e4c26add 688 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 689
690 /*
691 * no need to call ieee80211_wep_get_keyidx,
692 * it verifies a bunch of things we've done already
693 */
694 keyidx = rx->skb->data[hdrlen + 3] >> 6;
695
d4e46a3d 696 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
3017b80b
JB		 697
698 /*
699 * RSNA-protected unicast frames should always be sent with
700 * pairwise or station-to-station keys, but for WEP we allow
701 * using a key index as well.
702 */
8f20fc24 703 if (rx->key && rx->key->conf.alg != ALG_WEP &&
3017b80b
JB		 704 !is_multicast_ether_addr(hdr->addr1))
705 rx->key = NULL;
571ecf67
JB		 706 }
707
3017b80b 708 if (rx->key) {
571ecf67 709 rx->key->tx_rx_count++;
011bfcc4 710 /* TODO: add threshold stuff again */
1990af8d 711 } else {
e4c26add 712 return RX_DROP_MONITOR;
70f08765
JB		 713 }
714
1990af8d
JB		 715 /* Check for weak IVs if possible */
716 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
a7767f95 717 ieee80211_is_data(hdr->frame_control) &&
5cf121c3
JB		 718 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
719 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
1990af8d
JB		 720 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
721 rx->sta->wep_weak_iv_count++;
722
70f08765
JB		 723 switch (rx->key->conf.alg) {
724 case ALG_WEP:
e2f036da
MN		 725 result = ieee80211_crypto_wep_decrypt(rx);
726 break;
70f08765 727 case ALG_TKIP:
e2f036da
MN		 728 result = ieee80211_crypto_tkip_decrypt(rx);
729 break;
70f08765 730 case ALG_CCMP:
e2f036da
MN		 731 result = ieee80211_crypto_ccmp_decrypt(rx);
732 break;
3cfcf6ac
JM		 733 case ALG_AES_CMAC:
734 result = ieee80211_crypto_aes_cmac_decrypt(rx);
735 break;
70f08765
JB		 736 }
737
e2f036da 738 /* either the frame has been decrypted or will be dropped */
5cf121c3 739 rx->status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 740
741 return result;
70f08765
JB		 742}
743
572e0012
KV		 744static ieee80211_rx_result debug_noinline
745ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
746{
747 struct ieee80211_local *local;
748 struct ieee80211_hdr *hdr;
749 struct sk_buff *skb;
750
751 local = rx->local;
752 skb = rx->skb;
753 hdr = (struct ieee80211_hdr *) skb->data;
754
755 if (!local->pspolling)
756 return RX_CONTINUE;
757
758 if (!ieee80211_has_fromds(hdr->frame_control))
759 /* this is not from AP */
760 return RX_CONTINUE;
761
762 if (!ieee80211_is_data(hdr->frame_control))
763 return RX_CONTINUE;
764
765 if (!ieee80211_has_moredata(hdr->frame_control)) {
766 /* AP has no more frames buffered for us */
767 local->pspolling = false;
768 return RX_CONTINUE;
769 }
770
771 /* more data bit is set, let's request a new frame from the AP */
772 ieee80211_send_pspoll(local, rx->sdata);
773
774 return RX_CONTINUE;
775}
776
133b8226 777static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 778{
133b8226 779 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 780 struct ieee80211_local *local = sdata->local;
0795af57 781
3e122be0 782 atomic_inc(&sdata->bss->num_sta_ps);
af818581 783 set_sta_flags(sta, WLAN_STA_PS_STA);
24487981 784 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 785#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26
JB		 786 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
787 sdata->dev->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 788#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
789}
790
ff9458d3 791static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 792{
133b8226 793 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 794
3e122be0 795 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 796
af818581 797 clear_sta_flags(sta, WLAN_STA_PS_STA);
004c872e 798
571ecf67 799#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26
JB		 800 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
801 sdata->dev->name, sta->sta.addr, sta->sta.aid);
571ecf67 802#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 803
af818581 804 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 805#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581
JB		 806 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
807 sdata->dev->name, sta->sta.addr, sta->sta.aid);
571ecf67 808#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 809 return;
810 }
811
812 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 813}
814
49461622 815static ieee80211_rx_result debug_noinline
5cf121c3 816ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 817{
818 struct sta_info *sta = rx->sta;
a7767f95 819 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 820
821 if (!sta)
9ae54c84 822 return RX_CONTINUE;
571ecf67 823
b291ba11
JB		 824 /*
825 * Update last_rx only for IBSS packets which are for the current
826 * BSSID to avoid keeping the current IBSS network alive in cases
827 * where other STAs start using different BSSID.
828 */
05c914fe 829 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 830 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 831 NL80211_IFTYPE_ADHOC);
46900298 832 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
571ecf67 833 sta->last_rx = jiffies;
b291ba11
JB		 834 } else if (!is_multicast_ether_addr(hdr->addr1)) {
835 /*
33b64eb2
LCC		 836 * Mesh beacons will update last_rx when if they are found to
837 * match the current local configuration when processed.
571ecf67 838 */
b291ba11 839 sta->last_rx = jiffies;
571ecf67
JB		 840 }
841
5cf121c3 842 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 843 return RX_CONTINUE;
571ecf67 844
3cf335d5
KV		 845 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
846 ieee80211_sta_rx_notify(rx->sdata, hdr);
847
571ecf67
JB		 848 sta->rx_fragments++;
849 sta->rx_bytes += rx->skb->len;
5cf121c3
JB		 850 sta->last_signal = rx->status->signal;
851 sta->last_noise = rx->status->noise;
571ecf67 852
72eaa43a
JB		 853 /*
854 * Change STA power saving mode only at the end of a frame
855 * exchange sequence.
856 */
3e122be0 857 if (!ieee80211_has_morefrags(hdr->frame_control) &&
05c914fe
JB		 858 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
859 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 860 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 861 /*
862 * Ignore doze->wake transitions that are
863 * indicated by non-data frames, the standard
864 * is unclear here, but for example going to
865 * PS mode and then scanning would cause a
866 * doze->wake transition for the probe request,
867 * and that is clearly undesirable.
868 */
869 if (ieee80211_is_data(hdr->frame_control) &&
870 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 871 ap_sta_ps_end(sta);
72eaa43a
JB		 872 } else {
873 if (ieee80211_has_pm(hdr->frame_control))
874 ap_sta_ps_start(sta);
875 }
571ecf67
JB		 876 }
877
22403def
JB		 878 /*
879 * Drop (qos-)data::nullfunc frames silently, since they
880 * are used only to control station power saving mode.
881 */
882 if (ieee80211_is_nullfunc(hdr->frame_control) ||
883 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 884 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
22403def
JB		 885 /*
886 * Update counter and free packet here to avoid
887 * counting this as a dropped packed.
888 */
571ecf67
JB		 889 sta->rx_packets++;
890 dev_kfree_skb(rx->skb);
9ae54c84 891 return RX_QUEUED;
571ecf67
JB		 892 }
893
9ae54c84 894 return RX_CONTINUE;
571ecf67
JB		 895} /* ieee80211_rx_h_sta_process */
896
571ecf67
JB		 897static inline struct ieee80211_fragment_entry *
898ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
899 unsigned int frag, unsigned int seq, int rx_queue,
900 struct sk_buff **skb)
901{
902 struct ieee80211_fragment_entry *entry;
903 int idx;
904
905 idx = sdata->fragment_next;
906 entry = &sdata->fragments[sdata->fragment_next++];
907 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
908 sdata->fragment_next = 0;
909
910 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 911#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 912 struct ieee80211_hdr *hdr =
913 (struct ieee80211_hdr *) entry->skb_list.next->data;
914 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
915 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 916 "addr1=%pM addr2=%pM\n",
571ecf67
JB		 917 sdata->dev->name, idx,
918 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 919 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 920#endif
571ecf67
JB		 921 __skb_queue_purge(&entry->skb_list);
922 }
923
924 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
925 *skb = NULL;
926 entry->first_frag_time = jiffies;
927 entry->seq = seq;
928 entry->rx_queue = rx_queue;
929 entry->last_frag = frag;
930 entry->ccmp = 0;
931 entry->extra_len = 0;
932
933 return entry;
934}
935
936static inline struct ieee80211_fragment_entry *
937ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 938 unsigned int frag, unsigned int seq,
571ecf67
JB		 939 int rx_queue, struct ieee80211_hdr *hdr)
940{
941 struct ieee80211_fragment_entry *entry;
942 int i, idx;
943
944 idx = sdata->fragment_next;
945 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
946 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 947
948 idx--;
949 if (idx < 0)
950 idx = IEEE80211_FRAGMENT_MAX - 1;
951
952 entry = &sdata->fragments[idx];
953 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
954 entry->rx_queue != rx_queue ||
955 entry->last_frag + 1 != frag)
956 continue;
957
b73d70ad 958 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 959
b73d70ad
HH		 960 /*
961 * Check ftype and addresses are equal, else check next fragment
962 */
963 if (((hdr->frame_control ^ f_hdr->frame_control) &
964 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 965 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
966 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
967 continue;
968
ab46623e 969 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 970 __skb_queue_purge(&entry->skb_list);
971 continue;
972 }
973 return entry;
974 }
975
976 return NULL;
977}
978
49461622 979static ieee80211_rx_result debug_noinline
5cf121c3 980ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 981{
982 struct ieee80211_hdr *hdr;
983 u16 sc;
358c8d9d 984 __le16 fc;
571ecf67
JB		 985 unsigned int frag, seq;
986 struct ieee80211_fragment_entry *entry;
987 struct sk_buff *skb;
988
b73d70ad 989 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 990 fc = hdr->frame_control;
571ecf67
JB		 991 sc = le16_to_cpu(hdr->seq_ctrl);
992 frag = sc & IEEE80211_SCTL_FRAG;
993
358c8d9d 994 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 995 (rx->skb)->len < 24 ||
996 is_multicast_ether_addr(hdr->addr1))) {
997 /* not fragmented */
998 goto out;
999 }
1000 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1001
1002 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1003
1004 if (frag == 0) {
1005 /* This is the first fragment of a new frame. */
1006 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 1007 rx->queue, &(rx->skb));
8f20fc24 1008 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
358c8d9d 1009 ieee80211_has_protected(fc)) {
571ecf67
JB		 1010 /* Store CCMP PN so that we can verify that the next
1011 * fragment has a sequential PN value. */
1012 entry->ccmp = 1;
1013 memcpy(entry->last_pn,
5cf121c3 1014 rx->key->u.ccmp.rx_pn[rx->queue],
571ecf67
JB		 1015 CCMP_PN_LEN);
1016 }
9ae54c84 1017 return RX_QUEUED;
571ecf67
JB		 1018 }
1019
1020 /* This is a fragment for a frame that should already be pending in
1021 * fragment cache. Add this fragment to the end of the pending entry.
1022 */
b73d70ad 1023 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 1024 if (!entry) {
1025 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1026 return RX_DROP_MONITOR;
571ecf67
JB		 1027 }
1028
1029 /* Verify that MPDUs within one MSDU have sequential PN values.
1030 * (IEEE 802.11i, 8.3.3.4.5) */
1031 if (entry->ccmp) {
1032 int i;
1033 u8 pn[CCMP_PN_LEN], *rpn;
8f20fc24 1034 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
e4c26add 1035 return RX_DROP_UNUSABLE;
571ecf67
JB		 1036 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1037 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1038 pn[i]++;
1039 if (pn[i])
1040 break;
1041 }
5cf121c3 1042 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
f4ea83dd 1043 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1044 return RX_DROP_UNUSABLE;
571ecf67
JB		 1045 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1046 }
1047
358c8d9d 1048 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1049 __skb_queue_tail(&entry->skb_list, rx->skb);
1050 entry->last_frag = frag;
1051 entry->extra_len += rx->skb->len;
358c8d9d 1052 if (ieee80211_has_morefrags(fc)) {
571ecf67 1053 rx->skb = NULL;
9ae54c84 1054 return RX_QUEUED;
571ecf67
JB		 1055 }
1056
1057 rx->skb = __skb_dequeue(&entry->skb_list);
1058 if (skb_tailroom(rx->skb) < entry->extra_len) {
1059 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1060 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1061 GFP_ATOMIC))) {
1062 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1063 __skb_queue_purge(&entry->skb_list);
e4c26add 1064 return RX_DROP_UNUSABLE;
571ecf67
JB		 1065 }
1066 }
1067 while ((skb = __skb_dequeue(&entry->skb_list))) {
1068 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1069 dev_kfree_skb(skb);
1070 }
1071
1072 /* Complete frame has been reassembled - process it now */
5cf121c3 1073 rx->flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1074
1075 out:
1076 if (rx->sta)
1077 rx->sta->rx_packets++;
1078 if (is_multicast_ether_addr(hdr->addr1))
1079 rx->local->dot11MulticastReceivedFrameCount++;
1080 else
1081 ieee80211_led_rx(rx->local);
9ae54c84 1082 return RX_CONTINUE;
571ecf67
JB		 1083}
1084
49461622 1085static ieee80211_rx_result debug_noinline
5cf121c3 1086ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1087{
af818581 1088 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1089 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
571ecf67 1090
358c8d9d 1091 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
5cf121c3 1092 !(rx->flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1093 return RX_CONTINUE;
571ecf67 1094
05c914fe
JB		 1095 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1096 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1097 return RX_DROP_UNUSABLE;
98f0b0a3 1098
af818581
JB		 1099 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1100 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1101 else
1102 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1103
9ae54c84 1104 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1105 * count as an dropped frame. */
1106 dev_kfree_skb(rx->skb);
1107
9ae54c84 1108 return RX_QUEUED;
571ecf67
JB		 1109}
1110
49461622 1111static ieee80211_rx_result debug_noinline
5cf121c3 1112ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1113{
6e0d114d 1114 u8 *data = rx->skb->data;
238f74a2 1115 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1116
238f74a2 1117 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1118 return RX_CONTINUE;
6e0d114d
JB		 1119
1120 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1121 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1122 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1123 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1124 /* change frame type to non QOS */
238f74a2 1125 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1126
9ae54c84 1127 return RX_CONTINUE;
6e0d114d
JB		 1128}
1129
76ee65bf 1130static int
5cf121c3 1131ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1132{
07346f81 1133 if (unlikely(!rx->sta ||
f4ea83dd 1134 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1135 return -EACCES;
571ecf67 1136
76ee65bf 1137 return 0;
571ecf67
JB		 1138}
1139
76ee65bf 1140static int
358c8d9d 1141ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1142{
3017b80b 1143 /*
7848ba7d
JB		 1144 * Pass through unencrypted frames if the hardware has
1145 * decrypted them already.
3017b80b 1146 */
5cf121c3 1147 if (rx->status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1148 return 0;
571ecf67
JB		 1149
1150 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1151 if (unlikely(!ieee80211_has_protected(fc) &&
1152 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1153 ieee80211_is_data(fc) &&
b3fc9c6c 1154 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1155 return -EACCES;
f2ca3ea4
JM		 1156 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1157 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1158 rx->key))
1159 return -EACCES;
1160 /* BIP does not use Protected field, so need to check MMIE */
1161 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb)
1162 && ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1163 rx->key))
1164 return -EACCES;
1165 /*
1166 * When using MFP, Action frames are not allowed prior to
1167 * having configured keys.
1168 */
1169 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1170 ieee80211_is_robust_mgmt_frame(
1171 (struct ieee80211_hdr *) rx->skb->data)))
1172 return -EACCES;
1173 }
b3fc9c6c 1174
76ee65bf 1175 return 0;
571ecf67
JB		 1176}
1177
76ee65bf 1178static int
e31a16d6 1179__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67
JB		 1180{
1181 struct net_device *dev = rx->dev;
571ecf67 1182 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
f14543ee
FF		 1183 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1184
1185 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->use_4addr &&
1186 ieee80211_has_a4(hdr->frame_control))
1187 return -1;
1188 if (sdata->use_4addr && is_multicast_ether_addr(hdr->addr1))
1189 return -1;
571ecf67 1190
e31a16d6 1191 return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
76ee65bf 1192}
571ecf67 1193
ce3edf6d
JB		 1194/*
1195 * requires that rx->skb is a frame with ethernet header
1196 */
358c8d9d 1197static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1198{
c97c23e3 1199 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1200 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1201 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1202
1203 /*
1204 * Allow EAPOL frames to us/the PAE group address regardless
1205 * of whether the frame was encrypted or not.
1206 */
1207 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1208 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1209 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1210 return true;
1211
1212 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1213 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1214 return false;
1215
1216 return true;
1217}
1218
1219/*
1220 * requires that rx->skb is a frame with ethernet header
1221 */
76ee65bf 1222static void
5cf121c3 1223ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf
RR		 1224{
1225 struct net_device *dev = rx->dev;
1226 struct ieee80211_local *local = rx->local;
1227 struct sk_buff *skb, *xmit_skb;
1228 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ce3edf6d
JB		 1229 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1230 struct sta_info *dsta;
571ecf67 1231
76ee65bf
RR		 1232 skb = rx->skb;
1233 xmit_skb = NULL;
571ecf67 1234
05c914fe
JB		 1235 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1236 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1237 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
f501dba4 1238 (rx->flags & IEEE80211_RX_RA_MATCH) && !rx->sdata->use_4addr) {
ce3edf6d
JB		 1239 if (is_multicast_ether_addr(ehdr->h_dest)) {
1240 /*
1241 * send multicast frames both to higher layers in
1242 * local net stack and back to the wireless medium
1243 */
76ee65bf
RR		 1244 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1245 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1246 printk(KERN_DEBUG "%s: failed to clone "
1247 "multicast frame\n", dev->name);
1248 } else {
571ecf67 1249 dsta = sta_info_get(local, skb->data);
d0709a65 1250 if (dsta && dsta->sdata->dev == dev) {
ce3edf6d
JB		 1251 /*
1252 * The destination station is associated to
1253 * this AP (in this VLAN), so send the frame
1254 * directly to it and do not pass it to local
1255 * net stack.
571ecf67 1256 */
76ee65bf 1257 xmit_skb = skb;
571ecf67
JB		 1258 skb = NULL;
1259 }
571ecf67
JB		 1260 }
1261 }
1262
1263 if (skb) {
d1c3a37c
JB		 1264 int align __maybe_unused;
1265
1266#if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1267 /*
1268 * 'align' will only take the values 0 or 2 here
1269 * since all frames are required to be aligned
1270 * to 2-byte boundaries when being passed to
1271 * mac80211. That also explains the __skb_push()
1272 * below.
1273 */
dacb6f1d 1274 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1275 if (align) {
1276 if (WARN_ON(skb_headroom(skb) < 3)) {
1277 dev_kfree_skb(skb);
1278 skb = NULL;
1279 } else {
1280 u8 *data = skb->data;
8ce0b589
ZY		 1281 size_t len = skb_headlen(skb);
1282 skb->data -= align;
1283 memmove(skb->data, data, len);
1284 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1285 }
1286 }
1287#endif
1288
1289 if (skb) {
1290 /* deliver to local stack */
1291 skb->protocol = eth_type_trans(skb, dev);
1292 memset(skb->cb, 0, sizeof(skb->cb));
1293 netif_rx(skb);
1294 }
571ecf67
JB		 1295 }
1296
76ee65bf 1297 if (xmit_skb) {
571ecf67 1298 /* send to wireless media */
f831e909 1299 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1300 skb_reset_network_header(xmit_skb);
1301 skb_reset_mac_header(xmit_skb);
76ee65bf 1302 dev_queue_xmit(xmit_skb);
571ecf67 1303 }
76ee65bf
RR		 1304}
1305
49461622 1306static ieee80211_rx_result debug_noinline
5cf121c3 1307ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f
RR		 1308{
1309 struct net_device *dev = rx->dev;
1310 struct ieee80211_local *local = rx->local;
358c8d9d 1311 u16 ethertype;
fd4c7f2f
RR		 1312 u8 *payload;
1313 struct sk_buff *skb = rx->skb, *frame = NULL;
358c8d9d
HH		 1314 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1315 __le16 fc = hdr->frame_control;
fd4c7f2f
RR		 1316 const struct ethhdr *eth;
1317 int remaining, err;
1318 u8 dst[ETH_ALEN];
1319 u8 src[ETH_ALEN];
fd4c7f2f 1320
358c8d9d 1321 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1322 return RX_CONTINUE;
fd4c7f2f 1323
358c8d9d 1324 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1325 return RX_DROP_MONITOR;
fd4c7f2f 1326
5cf121c3 1327 if (!(rx->flags & IEEE80211_RX_AMSDU))
9ae54c84 1328 return RX_CONTINUE;
fd4c7f2f 1329
e31a16d6 1330 err = __ieee80211_data_to_8023(rx);
fd4c7f2f 1331 if (unlikely(err))
e4c26add 1332 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1333
1334 skb->dev = dev;
1335
1336 dev->stats.rx_packets++;
1337 dev->stats.rx_bytes += skb->len;
1338
1339 /* skip the wrapping header */
1340 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1341 if (!eth)
e4c26add 1342 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1343
1344 while (skb != frame) {
1345 u8 padding;
1346 __be16 len = eth->h_proto;
1347 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1348
1349 remaining = skb->len;
1350 memcpy(dst, eth->h_dest, ETH_ALEN);
1351 memcpy(src, eth->h_source, ETH_ALEN);
1352
1353 padding = ((4 - subframe_len) & 0x3);
1354 /* the last MSDU has no padding */
f4ea83dd 1355 if (subframe_len > remaining)
e4c26add 1356 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1357
1358 skb_pull(skb, sizeof(struct ethhdr));
1359 /* if last subframe reuse skb */
1360 if (remaining <= subframe_len + padding)
1361 frame = skb;
1362 else {
d1c3a37c
JB		 1363 /*
1364 * Allocate and reserve two bytes more for payload
1365 * alignment since sizeof(struct ethhdr) is 14.
1366 */
1367 frame = dev_alloc_skb(
1368 ALIGN(local->hw.extra_tx_headroom, 4) +
1369 subframe_len + 2);
fd4c7f2f
RR		 1370
1371 if (frame == NULL)
e4c26add 1372 return RX_DROP_UNUSABLE;
fd4c7f2f 1373
d1c3a37c
JB		 1374 skb_reserve(frame,
1375 ALIGN(local->hw.extra_tx_headroom, 4) +
1376 sizeof(struct ethhdr) + 2);
fd4c7f2f
RR		 1377 memcpy(skb_put(frame, ntohs(len)), skb->data,
1378 ntohs(len));
1379
1380 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1381 padding);
1382 if (!eth) {
fd4c7f2f 1383 dev_kfree_skb(frame);
e4c26add 1384 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1385 }
1386 }
1387
ce3edf6d 1388 skb_reset_network_header(frame);
fd4c7f2f
RR		 1389 frame->dev = dev;
1390 frame->priority = skb->priority;
1391 rx->skb = frame;
1392
fd4c7f2f
RR		 1393 payload = frame->data;
1394 ethertype = (payload[6] << 8) | payload[7];
1395
1396 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
ce3edf6d
JB		 1397 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1398 compare_ether_addr(payload,
1399 bridge_tunnel_header) == 0)) {
fd4c7f2f
RR		 1400 /* remove RFC1042 or Bridge-Tunnel
1401 * encapsulation and replace EtherType */
1402 skb_pull(frame, 6);
1403 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1404 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1405 } else {
ce3edf6d
JB		 1406 memcpy(skb_push(frame, sizeof(__be16)),
1407 &len, sizeof(__be16));
fd4c7f2f
RR		 1408 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1409 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1410 }
1411
358c8d9d 1412 if (!ieee80211_frame_allowed(rx, fc)) {
ce3edf6d 1413 if (skb == frame) /* last frame */
e4c26add 1414 return RX_DROP_UNUSABLE;
ce3edf6d
JB		 1415 dev_kfree_skb(frame);
1416 continue;
1417 }
fd4c7f2f
RR		 1418
1419 ieee80211_deliver_skb(rx);
1420 }
1421
9ae54c84 1422 return RX_QUEUED;
fd4c7f2f
RR		 1423}
1424
bf94e17b 1425#ifdef CONFIG_MAC80211_MESH
b0dee578 1426static ieee80211_rx_result
e32f85f7
LCC		 1427ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1428{
1429 struct ieee80211_hdr *hdr;
1430 struct ieee80211s_hdr *mesh_hdr;
1431 unsigned int hdrlen;
1432 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1433 struct ieee80211_local *local = rx->local;
249b405c 1434 struct ieee80211_sub_if_data *sdata;
e32f85f7
LCC		 1435
1436 hdr = (struct ieee80211_hdr *) skb->data;
1437 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1438 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
249b405c 1439 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
e32f85f7
LCC		 1440
1441 if (!ieee80211_is_data(hdr->frame_control))
1442 return RX_CONTINUE;
1443
1444 if (!mesh_hdr->ttl)
1445 /* illegal frame */
1446 return RX_DROP_MONITOR;
1447
43b7b314 1448 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1449 struct mesh_path *mppath;
43b7b314
JC		 1450 char *proxied_addr;
1451 char *mpp_addr;
1452
1453 if (is_multicast_ether_addr(hdr->addr1)) {
1454 mpp_addr = hdr->addr3;
1455 proxied_addr = mesh_hdr->eaddr1;
1456 } else {
1457 mpp_addr = hdr->addr4;
1458 proxied_addr = mesh_hdr->eaddr2;
1459 }
79617dee 1460
79617dee 1461 rcu_read_lock();
43b7b314 1462 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1463 if (!mppath) {
43b7b314 1464 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1465 } else {
1466 spin_lock_bh(&mppath->state_lock);
1467 mppath->exp_time = jiffies;
43b7b314
JC		 1468 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1469 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1470 spin_unlock_bh(&mppath->state_lock);
1471 }
1472 rcu_read_unlock();
1473 }
1474
3c5772a5
JC		 1475 /* Frame has reached destination. Don't forward */
1476 if (!is_multicast_ether_addr(hdr->addr1) &&
1477 compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
e32f85f7
LCC		 1478 return RX_CONTINUE;
1479
1480 mesh_hdr->ttl--;
1481
1482 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1483 if (!mesh_hdr->ttl)
472dbc45 1484 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1485 dropped_frames_ttl);
1486 else {
1487 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1488 struct ieee80211_tx_info *info;
1489
e32f85f7
LCC		 1490 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1491
1492 if (!fwd_skb && net_ratelimit())
1493 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1494 rx->dev->name);
1495
1496 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
e32f85f7 1497 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
3b8d81e0
JB		 1498 info = IEEE80211_SKB_CB(fwd_skb);
1499 memset(info, 0, sizeof(*info));
1500 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1501 info->control.vif = &rx->sdata->vif;
3b8d81e0 1502 ieee80211_select_queue(local, fwd_skb);
c8a61a7d
DW		 1503 if (is_multicast_ether_addr(fwd_hdr->addr1))
1504 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1505 fwded_mcast);
1506 else {
3c5772a5
JC		 1507 int err;
1508 /*
1509 * Save TA to addr1 to send TA a path error if a
1510 * suitable next hop is not found
1511 */
1512 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1513 ETH_ALEN);
3c5772a5 1514 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1515 /* Failed to immediately resolve next hop:
1516 * fwded frame was dropped or will be added
1517 * later to the pending skb queue. */
1518 if (err)
1519 return RX_DROP_MONITOR;
c8a61a7d
DW		 1520
1521 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1522 fwded_unicast);
249b405c
JC		 1523 }
1524 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1525 fwded_frames);
3b8d81e0 1526 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1527 }
1528 }
1529
3c5772a5 1530 if (is_multicast_ether_addr(hdr->addr1) ||
e32f85f7
LCC		 1531 rx->dev->flags & IFF_PROMISC)
1532 return RX_CONTINUE;
1533 else
1534 return RX_DROP_MONITOR;
1535}
bf94e17b 1536#endif
e32f85f7 1537
49461622 1538static ieee80211_rx_result debug_noinline
5cf121c3 1539ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf
RR		 1540{
1541 struct net_device *dev = rx->dev;
358c8d9d 1542 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
f14543ee 1543 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
358c8d9d 1544 __le16 fc = hdr->frame_control;
ce3edf6d 1545 int err;
76ee65bf 1546
358c8d9d 1547 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1548 return RX_CONTINUE;
76ee65bf 1549
358c8d9d 1550 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1551 return RX_DROP_MONITOR;
76ee65bf 1552
f14543ee
FF		 1553 /*
1554 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1555 * that a 4-addr station can be detected and moved into a separate VLAN
1556 */
1557 if (ieee80211_has_a4(hdr->frame_control) &&
1558 sdata->vif.type == NL80211_IFTYPE_AP)
1559 return RX_DROP_MONITOR;
1560
e31a16d6 1561 err = __ieee80211_data_to_8023(rx);
76ee65bf 1562 if (unlikely(err))
e4c26add 1563 return RX_DROP_UNUSABLE;
76ee65bf 1564
358c8d9d 1565 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1566 return RX_DROP_MONITOR;
ce3edf6d 1567
76ee65bf
RR		 1568 rx->skb->dev = dev;
1569
1570 dev->stats.rx_packets++;
1571 dev->stats.rx_bytes += rx->skb->len;
1572
1573 ieee80211_deliver_skb(rx);
571ecf67 1574
9ae54c84 1575 return RX_QUEUED;
571ecf67
JB		 1576}
1577
49461622 1578static ieee80211_rx_result debug_noinline
5cf121c3 1579ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 1580{
1581 struct ieee80211_local *local = rx->local;
1582 struct ieee80211_hw *hw = &local->hw;
1583 struct sk_buff *skb = rx->skb;
a7767f95 1584 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1585 struct tid_ampdu_rx *tid_agg_rx;
1586 u16 start_seq_num;
1587 u16 tid;
1588
a7767f95 1589 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1590 return RX_CONTINUE;
71364716 1591
a7767f95 1592 if (ieee80211_is_back_req(bar->frame_control)) {
71364716 1593 if (!rx->sta)
a02ae758 1594 return RX_DROP_MONITOR;
71364716 1595 tid = le16_to_cpu(bar->control) >> 12;
cee24a3e
RR		 1596 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1597 != HT_AGG_STATE_OPERATIONAL)
a02ae758 1598 return RX_DROP_MONITOR;
cee24a3e 1599 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
71364716
RR		 1600
1601 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1602
1603 /* reset session timer */
20ad19d0
JB		 1604 if (tid_agg_rx->timeout)
1605 mod_timer(&tid_agg_rx->session_timer,
1606 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 1607
a02ae758
JB		 1608 /* release stored frames up to start of BAR */
1609 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
1610 kfree_skb(skb);
1611 return RX_QUEUED;
71364716
RR		 1612 }
1613
9ae54c84 1614 return RX_CONTINUE;
71364716
RR		 1615}
1616
f4f727a6
JM		 1617static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1618 struct ieee80211_mgmt *mgmt,
1619 size_t len)
fea14732
JM		 1620{
1621 struct ieee80211_local *local = sdata->local;
1622 struct sk_buff *skb;
1623 struct ieee80211_mgmt *resp;
1624
1625 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1626 /* Not to own unicast address */
1627 return;
1628 }
1629
46900298
JB		 1630 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1631 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 1632 /* Not from the current AP or not associated yet. */
fea14732
JM		 1633 return;
1634 }
1635
1636 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1637 /* Too short SA Query request frame */
1638 return;
1639 }
1640
1641 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1642 if (skb == NULL)
1643 return;
1644
1645 skb_reserve(skb, local->hw.extra_tx_headroom);
1646 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1647 memset(resp, 0, 24);
1648 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1649 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
46900298 1650 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 1651 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1652 IEEE80211_STYPE_ACTION);
1653 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1654 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1655 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1656 memcpy(resp->u.action.u.sa_query.trans_id,
1657 mgmt->u.action.u.sa_query.trans_id,
1658 WLAN_SA_QUERY_TR_ID_LEN);
1659
1660 ieee80211_tx_skb(sdata, skb, 1);
1661}
1662
de1ede7a
JB		 1663static ieee80211_rx_result debug_noinline
1664ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1665{
1666 struct ieee80211_local *local = rx->local;
1667 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1668 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1669 int len = rx->skb->len;
1670
1671 if (!ieee80211_is_action(mgmt->frame_control))
1672 return RX_CONTINUE;
1673
1674 if (!rx->sta)
1675 return RX_DROP_MONITOR;
1676
1677 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1678 return RX_DROP_MONITOR;
1679
97ebe12a
JM		 1680 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1681 return RX_DROP_MONITOR;
1682
de1ede7a
JB		 1683 /* all categories we currently handle have action_code */
1684 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1685 return RX_DROP_MONITOR;
1686
de1ede7a
JB		 1687 switch (mgmt->u.action.category) {
1688 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 1689 /*
1690 * The aggregation code is not prepared to handle
1691 * anything but STA/AP due to the BSSID handling;
1692 * IBSS could work in the code but isn't supported
1693 * by drivers or the standard.
1694 */
1695 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1696 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1697 sdata->vif.type != NL80211_IFTYPE_AP)
1698 return RX_DROP_MONITOR;
1699
de1ede7a
JB		 1700 switch (mgmt->u.action.u.addba_req.action_code) {
1701 case WLAN_ACTION_ADDBA_REQ:
1702 if (len < (IEEE80211_MIN_ACTION_SIZE +
1703 sizeof(mgmt->u.action.u.addba_req)))
1704 return RX_DROP_MONITOR;
1705 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1706 break;
1707 case WLAN_ACTION_ADDBA_RESP:
1708 if (len < (IEEE80211_MIN_ACTION_SIZE +
1709 sizeof(mgmt->u.action.u.addba_resp)))
1710 return RX_DROP_MONITOR;
1711 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1712 break;
1713 case WLAN_ACTION_DELBA:
1714 if (len < (IEEE80211_MIN_ACTION_SIZE +
1715 sizeof(mgmt->u.action.u.delba)))
1716 return RX_DROP_MONITOR;
1717 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1718 break;
1719 }
39192c0b
JB		 1720 break;
1721 case WLAN_CATEGORY_SPECTRUM_MGMT:
1722 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1723 return RX_DROP_MONITOR;
46900298
JB		 1724
1725 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1726 return RX_DROP_MONITOR;
1727
39192c0b
JB		 1728 switch (mgmt->u.action.u.measurement.action_code) {
1729 case WLAN_ACTION_SPCT_MSR_REQ:
1730 if (len < (IEEE80211_MIN_ACTION_SIZE +
1731 sizeof(mgmt->u.action.u.measurement)))
1732 return RX_DROP_MONITOR;
1733 ieee80211_process_measurement_req(sdata, mgmt, len);
1734 break;
c481ec97
S		 1735 case WLAN_ACTION_SPCT_CHL_SWITCH:
1736 if (len < (IEEE80211_MIN_ACTION_SIZE +
1737 sizeof(mgmt->u.action.u.chan_switch)))
1738 return RX_DROP_MONITOR;
1739
cc32abd4
JB		 1740 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1741 return RX_DROP_MONITOR;
1742
46900298 1743 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
c481ec97
S		 1744 return RX_DROP_MONITOR;
1745
77fdaa12 1746 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
39192c0b
JB		 1747 }
1748 break;
fea14732
JM		 1749 case WLAN_CATEGORY_SA_QUERY:
1750 if (len < (IEEE80211_MIN_ACTION_SIZE +
1751 sizeof(mgmt->u.action.u.sa_query)))
1752 return RX_DROP_MONITOR;
1753 switch (mgmt->u.action.u.sa_query.action) {
1754 case WLAN_ACTION_SA_QUERY_REQUEST:
1755 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1756 return RX_DROP_MONITOR;
1757 ieee80211_process_sa_query_req(sdata, mgmt, len);
1758 break;
1759 case WLAN_ACTION_SA_QUERY_RESPONSE:
1760 /*
1761 * SA Query response is currently only used in AP mode
1762 * and it is processed in user space.
1763 */
1764 return RX_CONTINUE;
1765 }
1766 break;
39192c0b
JB		 1767 default:
1768 return RX_CONTINUE;
de1ede7a
JB		 1769 }
1770
39192c0b
JB		 1771 rx->sta->rx_packets++;
1772 dev_kfree_skb(rx->skb);
1773 return RX_QUEUED;
de1ede7a
JB		 1774}
1775
49461622 1776static ieee80211_rx_result debug_noinline
5cf121c3 1777ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 1778{
759ef3eb 1779 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
97ebe12a 1780 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
571ecf67 1781
5cf121c3 1782 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
e4c26add 1783 return RX_DROP_MONITOR;
571ecf67 1784
97ebe12a
JM		 1785 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1786 return RX_DROP_MONITOR;
1787
472dbc45 1788 if (ieee80211_vif_is_mesh(&sdata->vif))
f1d58c25 1789 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
472dbc45 1790
3832c287 1791 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
f1d58c25 1792 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
f9d540ee 1793
7986cf95 1794 if (sdata->vif.type == NL80211_IFTYPE_STATION)
f1d58c25 1795 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
46900298 1796
7986cf95 1797 return RX_DROP_MONITOR;
571ecf67
JB		 1798}
1799
3b8d81e0 1800static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
5cf121c3 1801 struct ieee80211_rx_data *rx)
571ecf67 1802{
a7767f95
HH		 1803 int keyidx;
1804 unsigned int hdrlen;
571ecf67 1805
a7767f95 1806 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 1807 if (rx->skb->len >= hdrlen + 4)
1808 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1809 else
1810 keyidx = -1;
1811
8944b79f 1812 if (!rx->sta) {
aa0daf0e
JB		 1813 /*
1814 * Some hardware seem to generate incorrect Michael MIC
1815 * reports; ignore them to avoid triggering countermeasures.
1816 */
af2ced6a 1817 return;
571ecf67
JB		 1818 }
1819
a7767f95 1820 if (!ieee80211_has_protected(hdr->frame_control))
af2ced6a 1821 return;
571ecf67 1822
05c914fe 1823 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
aa0daf0e
JB		 1824 /*
1825 * APs with pairwise keys should never receive Michael MIC
1826 * errors for non-zero keyidx because these are reserved for
1827 * group keys and only the AP is sending real multicast
1828 * frames in the BSS.
1829 */
af2ced6a 1830 return;
571ecf67
JB		 1831 }
1832
a7767f95
HH		 1833 if (!ieee80211_is_data(hdr->frame_control) &&
1834 !ieee80211_is_auth(hdr->frame_control))
af2ced6a 1835 return;
571ecf67 1836
e6d6e342
JB		 1837 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
1838 GFP_ATOMIC);
571ecf67
JB		 1839}
1840
5cf121c3
JB		 1841/* TODO: use IEEE80211_RX_FRAGMENTED */
1842static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
3d30d949
MW		 1843{
1844 struct ieee80211_sub_if_data *sdata;
1845 struct ieee80211_local *local = rx->local;
1846 struct ieee80211_rtap_hdr {
1847 struct ieee80211_radiotap_header hdr;
1848 u8 flags;
1849 u8 rate;
1850 __le16 chan_freq;
1851 __le16 chan_flags;
1852 } __attribute__ ((packed)) *rthdr;
1853 struct sk_buff *skb = rx->skb, *skb2;
1854 struct net_device *prev_dev = NULL;
5cf121c3 1855 struct ieee80211_rx_status *status = rx->status;
3d30d949 1856
5cf121c3 1857 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
3d30d949
MW		 1858 goto out_free_skb;
1859
1860 if (skb_headroom(skb) < sizeof(*rthdr) &&
1861 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1862 goto out_free_skb;
1863
1864 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1865 memset(rthdr, 0, sizeof(*rthdr));
1866 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1867 rthdr->hdr.it_present =
1868 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1869 (1 << IEEE80211_RADIOTAP_RATE) |
1870 (1 << IEEE80211_RADIOTAP_CHANNEL));
1871
5cf121c3 1872 rthdr->rate = rx->rate->bitrate / 5;
3d30d949
MW		 1873 rthdr->chan_freq = cpu_to_le16(status->freq);
1874
1875 if (status->band == IEEE80211_BAND_5GHZ)
1876 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1877 IEEE80211_CHAN_5GHZ);
1878 else
1879 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1880 IEEE80211_CHAN_2GHZ);
1881
1882 skb_set_mac_header(skb, 0);
1883 skb->ip_summed = CHECKSUM_UNNECESSARY;
1884 skb->pkt_type = PACKET_OTHERHOST;
1885 skb->protocol = htons(ETH_P_802_2);
1886
1887 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1888 if (!netif_running(sdata->dev))
1889 continue;
1890
05c914fe 1891 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 1892 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1893 continue;
1894
1895 if (prev_dev) {
1896 skb2 = skb_clone(skb, GFP_ATOMIC);
1897 if (skb2) {
1898 skb2->dev = prev_dev;
1899 netif_rx(skb2);
1900 }
1901 }
1902
1903 prev_dev = sdata->dev;
1904 sdata->dev->stats.rx_packets++;
1905 sdata->dev->stats.rx_bytes += skb->len;
1906 }
1907
1908 if (prev_dev) {
1909 skb->dev = prev_dev;
1910 netif_rx(skb);
1911 skb = NULL;
1912 } else
1913 goto out_free_skb;
1914
5cf121c3 1915 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
3d30d949
MW		 1916 return;
1917
1918 out_free_skb:
1919 dev_kfree_skb(skb);
1920}
1921
571ecf67 1922
8944b79f 1923static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
5cf121c3 1924 struct ieee80211_rx_data *rx,
8944b79f 1925 struct sk_buff *skb)
58905290 1926{
58905290
JB		 1927 ieee80211_rx_result res = RX_DROP_MONITOR;
1928
8944b79f
JB		 1929 rx->skb = skb;
1930 rx->sdata = sdata;
1931 rx->dev = sdata->dev;
1932
e32f85f7
LCC		 1933#define CALL_RXH(rxh) \
1934 do { \
1935 res = rxh(rx); \
1936 if (res != RX_CONTINUE) \
1937 goto rxh_done; \
1938 } while (0);
49461622
JB		 1939
1940 CALL_RXH(ieee80211_rx_h_passive_scan)
1941 CALL_RXH(ieee80211_rx_h_check)
1942 CALL_RXH(ieee80211_rx_h_decrypt)
572e0012 1943 CALL_RXH(ieee80211_rx_h_check_more_data)
49461622
JB		 1944 CALL_RXH(ieee80211_rx_h_sta_process)
1945 CALL_RXH(ieee80211_rx_h_defragment)
1946 CALL_RXH(ieee80211_rx_h_ps_poll)
1947 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1948 /* must be after MMIC verify so header is counted in MPDU mic */
1949 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1950 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 1951#ifdef CONFIG_MAC80211_MESH
e32f85f7
LCC		 1952 if (ieee80211_vif_is_mesh(&sdata->vif))
1953 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 1954#endif
49461622
JB		 1955 CALL_RXH(ieee80211_rx_h_data)
1956 CALL_RXH(ieee80211_rx_h_ctrl)
de1ede7a 1957 CALL_RXH(ieee80211_rx_h_action)
49461622
JB		 1958 CALL_RXH(ieee80211_rx_h_mgmt)
1959
1960#undef CALL_RXH
1961
1962 rxh_done:
58905290
JB		 1963 switch (res) {
1964 case RX_DROP_MONITOR:
49461622
JB		 1965 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1966 if (rx->sta)
1967 rx->sta->rx_dropped++;
1968 /* fall through */
1969 case RX_CONTINUE:
3d30d949
MW		 1970 ieee80211_rx_cooked_monitor(rx);
1971 break;
58905290 1972 case RX_DROP_UNUSABLE:
49461622
JB		 1973 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1974 if (rx->sta)
1975 rx->sta->rx_dropped++;
58905290
JB		 1976 dev_kfree_skb(rx->skb);
1977 break;
49461622
JB		 1978 case RX_QUEUED:
1979 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1980 break;
58905290
JB		 1981 }
1982}
1983
571ecf67
JB		 1984/* main receive path */
1985
23a24def 1986static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
7ab17c45 1987 struct ieee80211_rx_data *rx,
23a24def
JB		 1988 struct ieee80211_hdr *hdr)
1989{
7ab17c45 1990 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
23a24def
JB		 1991 int multicast = is_multicast_ether_addr(hdr->addr1);
1992
51fb61e7 1993 switch (sdata->vif.type) {
05c914fe 1994 case NL80211_IFTYPE_STATION:
f14543ee 1995 if (!bssid && !sdata->use_4addr)
23a24def 1996 return 0;
77fdaa12
JB		 1997 if (!multicast &&
1998 compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) {
4150c572 1999 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2000 return 0;
5cf121c3 2001 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2002 }
2003 break;
05c914fe 2004 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2005 if (!bssid)
2006 return 0;
a7767f95 2007 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2008 return 1;
87291c02 2009 }
46900298 2010 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
5cf121c3 2011 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 2012 return 0;
5cf121c3 2013 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2014 } else if (!multicast &&
2015 compare_ether_addr(sdata->dev->dev_addr,
2016 hdr->addr1) != 0) {
4150c572 2017 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2018 return 0;
5cf121c3 2019 rx->flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2020 } else if (!rx->sta) {
2021 int rate_idx;
2022 if (rx->status->flag & RX_FLAG_HT)
2023 rate_idx = 0; /* TODO: HT rates */
2024 else
2025 rate_idx = rx->status->rate_idx;
ab1f5c0b 2026 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
0fb8ca45
JM		 2027 BIT(rate_idx));
2028 }
23a24def 2029 break;
05c914fe 2030 case NL80211_IFTYPE_MESH_POINT:
6032f934
JB		 2031 if (!multicast &&
2032 compare_ether_addr(sdata->dev->dev_addr,
2033 hdr->addr1) != 0) {
2034 if (!(sdata->dev->flags & IFF_PROMISC))
2035 return 0;
2036
5cf121c3 2037 rx->flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2038 }
2039 break;
05c914fe
JB		 2040 case NL80211_IFTYPE_AP_VLAN:
2041 case NL80211_IFTYPE_AP:
23a24def
JB		 2042 if (!bssid) {
2043 if (compare_ether_addr(sdata->dev->dev_addr,
2044 hdr->addr1))
2045 return 0;
2046 } else if (!ieee80211_bssid_match(bssid,
2047 sdata->dev->dev_addr)) {
5cf121c3 2048 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 2049 return 0;
5cf121c3 2050 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2051 }
23a24def 2052 break;
05c914fe 2053 case NL80211_IFTYPE_WDS:
a7767f95 2054 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2055 return 0;
2056 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2057 return 0;
2058 break;
05c914fe 2059 case NL80211_IFTYPE_MONITOR:
05c914fe
JB		 2060 case NL80211_IFTYPE_UNSPECIFIED:
2061 case __NL80211_IFTYPE_AFTER_LAST:
fb1c1cd6
JB		 2062 /* should never get here */
2063 WARN_ON(1);
2064 break;
23a24def
JB		 2065 }
2066
2067 return 1;
2068}
2069
571ecf67 2070/*
6368e4b1
RR		 2071 * This is the actual Rx frames handler. as it blongs to Rx path it must
2072 * be called with rcu_read_lock protection.
571ecf67 2073 */
71ebb4aa
RR		 2074static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2075 struct sk_buff *skb,
8318d78a 2076 struct ieee80211_rate *rate)
571ecf67 2077{
f1d58c25 2078 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2079 struct ieee80211_local *local = hw_to_local(hw);
2080 struct ieee80211_sub_if_data *sdata;
571ecf67 2081 struct ieee80211_hdr *hdr;
5cf121c3 2082 struct ieee80211_rx_data rx;
6368e4b1 2083 int prepares;
8e6f0032
JB		 2084 struct ieee80211_sub_if_data *prev = NULL;
2085 struct sk_buff *skb_new;
571ecf67 2086
358c8d9d 2087 hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 2088 memset(&rx, 0, sizeof(rx));
2089 rx.skb = skb;
2090 rx.local = local;
5cf121c3 2091 rx.status = status;
5cf121c3 2092 rx.rate = rate;
72abd81b 2093
358c8d9d 2094 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
571ecf67 2095 local->dot11ReceivedFragmentCount++;
571ecf67 2096
142b9f50
HS		 2097 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2098 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
5cf121c3 2099 rx.flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2100
38f3714d 2101 ieee80211_parse_qos(&rx);
d1c3a37c 2102 ieee80211_verify_alignment(&rx);
38f3714d 2103
af2ced6a
JB		 2104 rx.sta = sta_info_get(local, hdr->addr2);
2105 if (rx.sta) {
2106 rx.sdata = rx.sta->sdata;
2107 rx.dev = rx.sta->sdata->dev;
2108 }
571ecf67 2109
fbc44bf7
JB		 2110 if (rx.sdata && ieee80211_is_data(hdr->frame_control)) {
2111 rx.flags |= IEEE80211_RX_RA_MATCH;
2112 prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
af2ced6a
JB		 2113 if (prepares) {
2114 if (status->flag & RX_FLAG_MMIC_ERROR) {
2115 if (rx.flags & IEEE80211_RX_RA_MATCH)
2116 ieee80211_rx_michael_mic_report(hdr, &rx);
2117 } else
2118 prev = rx.sdata;
2119 }
fbc44bf7 2120 } else list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2a8a9a88
JB		 2121 if (!netif_running(sdata->dev))
2122 continue;
2123
fbc44bf7
JB		 2124 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2125 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
b2e7771e
JB		 2126 continue;
2127
5cf121c3 2128 rx.flags |= IEEE80211_RX_RA_MATCH;
7ab17c45 2129 prepares = prepare_for_handlers(sdata, &rx, hdr);
23a24def 2130
6368e4b1 2131 if (!prepares)
23a24def 2132 continue;
8e6f0032 2133
af2ced6a
JB		 2134 if (status->flag & RX_FLAG_MMIC_ERROR) {
2135 rx.sdata = sdata;
2136 if (rx.flags & IEEE80211_RX_RA_MATCH)
2137 ieee80211_rx_michael_mic_report(hdr, &rx);
2138 continue;
2139 }
2140
340e11f3
JB		 2141 /*
2142 * frame is destined for this interface, but if it's not
2143 * also for the previous one we handle that after the
2144 * loop to avoid copying the SKB once too much
2145 */
2146
2147 if (!prev) {
2148 prev = sdata;
2149 continue;
8e6f0032 2150 }
340e11f3
JB		 2151
2152 /*
2153 * frame was destined for the previous interface
2154 * so invoke RX handlers for it
2155 */
2156
2157 skb_new = skb_copy(skb, GFP_ATOMIC);
2158 if (!skb_new) {
2159 if (net_ratelimit())
2160 printk(KERN_DEBUG "%s: failed to copy "
a4278e18 2161 "multicast frame for %s\n",
dd1cd4c6
JB		 2162 wiphy_name(local->hw.wiphy),
2163 prev->dev->name);
340e11f3
JB		 2164 continue;
2165 }
8944b79f 2166 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
8e6f0032 2167 prev = sdata;
571ecf67 2168 }
a4b7d7bd 2169 if (prev)
8944b79f 2170 ieee80211_invoke_rx_handlers(prev, &rx, skb);
a4b7d7bd 2171 else
8e6f0032 2172 dev_kfree_skb(skb);
571ecf67 2173}
6368e4b1 2174
b580781e
RR		 2175#define SEQ_MODULO 0x1000
2176#define SEQ_MASK 0xfff
2177
2178static inline int seq_less(u16 sq1, u16 sq2)
2179{
c6a1fa12 2180 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
b580781e
RR		 2181}
2182
2183static inline u16 seq_inc(u16 sq)
2184{
c6a1fa12 2185 return (sq + 1) & SEQ_MASK;
b580781e
RR		 2186}
2187
2188static inline u16 seq_sub(u16 sq1, u16 sq2)
2189{
c6a1fa12 2190 return (sq1 - sq2) & SEQ_MASK;
b580781e
RR		 2191}
2192
2193
2d3babd1
JM		 2194static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
2195 struct tid_ampdu_rx *tid_agg_rx,
2196 int index)
2197{
2198 struct ieee80211_supported_band *sband;
2199 struct ieee80211_rate *rate;
f1d58c25
JB		 2200 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
2201 struct ieee80211_rx_status *status;
2d3babd1 2202
f1d58c25 2203 if (!skb)
2d3babd1
JM		 2204 goto no_frame;
2205
f1d58c25
JB		 2206 status = IEEE80211_SKB_RXCB(skb);
2207
2d3babd1 2208 /* release the reordered frames to stack */
f1d58c25
JB		 2209 sband = hw->wiphy->bands[status->band];
2210 if (status->flag & RX_FLAG_HT)
2d3babd1
JM		 2211 rate = sband->bitrates; /* TODO: HT rates */
2212 else
f1d58c25
JB		 2213 rate = &sband->bitrates[status->rate_idx];
2214 __ieee80211_rx_handle_packet(hw, skb, rate);
2d3babd1
JM		 2215 tid_agg_rx->stored_mpdu_num--;
2216 tid_agg_rx->reorder_buf[index] = NULL;
2217
2218no_frame:
2219 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2220}
2221
a02ae758
JB		 2222static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
2223 struct tid_ampdu_rx *tid_agg_rx,
2224 u16 head_seq_num)
2225{
2226 int index;
2227
2228 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2229 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
2230 tid_agg_rx->buf_size;
2231 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
2232 }
2233}
2d3babd1 2234
4d050f1d
JM		 2235/*
2236 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2237 * the skb was added to the buffer longer than this time ago, the earlier
2238 * frames that have not yet been received are assumed to be lost and the skb
2239 * can be released for processing. This may also release other skb's from the
2240 * reorder buffer if there are no additional gaps between the frames.
2241 */
2242#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2243
71364716 2244/*
a02ae758
JB		 2245 * As this function belongs to the RX path it must be under
2246 * rcu_read_lock protection. It returns false if the frame
2247 * can be processed immediately, true if it was consumed.
71364716 2248 */
a02ae758
JB		 2249static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2250 struct tid_ampdu_rx *tid_agg_rx,
2251 struct sk_buff *skb)
b580781e 2252{
a02ae758
JB		 2253 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2254 u16 sc = le16_to_cpu(hdr->seq_ctrl);
2255 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
b580781e
RR		 2256 u16 head_seq_num, buf_size;
2257 int index;
b580781e
RR		 2258
2259 buf_size = tid_agg_rx->buf_size;
2260 head_seq_num = tid_agg_rx->head_seq_num;
2261
2262 /* frame with out of date sequence number */
2263 if (seq_less(mpdu_seq_num, head_seq_num)) {
2264 dev_kfree_skb(skb);
a02ae758 2265 return true;
b580781e
RR		 2266 }
2267
a02ae758
JB		 2268 /*
2269 * If frame the sequence number exceeds our buffering window
2270 * size release some previous frames to make room for this one.
2271 */
2272 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
2273 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
b580781e 2274 /* release stored frames up to new head to stack */
a02ae758 2275 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
b580781e
RR		 2276 }
2277
a02ae758
JB		 2278 /* Now the new frame is always in the range of the reordering buffer */
2279
2280 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2281
b580781e
RR		 2282 /* check if we already stored this frame */
2283 if (tid_agg_rx->reorder_buf[index]) {
2284 dev_kfree_skb(skb);
a02ae758 2285 return true;
b580781e
RR		 2286 }
2287
a02ae758
JB		 2288 /*
2289 * If the current MPDU is in the right order and nothing else
2290 * is stored we can process it directly, no need to buffer it.
2291 */
b580781e 2292 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
a02ae758
JB		 2293 tid_agg_rx->stored_mpdu_num == 0) {
2294 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2295 return false;
b580781e
RR		 2296 }
2297
2298 /* put the frame in the reordering buffer */
2299 tid_agg_rx->reorder_buf[index] = skb;
4d050f1d 2300 tid_agg_rx->reorder_time[index] = jiffies;
b580781e
RR		 2301 tid_agg_rx->stored_mpdu_num++;
2302 /* release the buffer until next missing frame */
a02ae758
JB		 2303 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
2304 tid_agg_rx->buf_size;
4d050f1d
JM		 2305 if (!tid_agg_rx->reorder_buf[index] &&
2306 tid_agg_rx->stored_mpdu_num > 1) {
2307 /*
2308 * No buffers ready to be released, but check whether any
2309 * frames in the reorder buffer have timed out.
2310 */
2311 int j;
2312 int skipped = 1;
2313 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
2314 j = (j + 1) % tid_agg_rx->buf_size) {
a02ae758 2315 if (!tid_agg_rx->reorder_buf[j]) {
4d050f1d
JM		 2316 skipped++;
2317 continue;
2318 }
2319 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
a02ae758 2320 HT_RX_REORDER_BUF_TIMEOUT))
4d050f1d
JM		 2321 break;
2322
2323#ifdef CONFIG_MAC80211_HT_DEBUG
2324 if (net_ratelimit())
2325 printk(KERN_DEBUG "%s: release an RX reorder "
2326 "frame due to timeout on earlier "
2327 "frames\n",
2328 wiphy_name(hw->wiphy));
2329#endif
2330 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
2331
2332 /*
2333 * Increment the head seq# also for the skipped slots.
2334 */
2335 tid_agg_rx->head_seq_num =
a02ae758 2336 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
4d050f1d
JM		 2337 skipped = 0;
2338 }
2339 } else while (tid_agg_rx->reorder_buf[index]) {
2d3babd1 2340 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
a02ae758
JB		 2341 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
2342 tid_agg_rx->buf_size;
b580781e 2343 }
a02ae758
JB		 2344
2345 return true;
b580781e
RR		 2346}
2347
a02ae758
JB		 2348/*
2349 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
2350 * true if the MPDU was buffered, false if it should be processed.
2351 */
2352static bool ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2353 struct sk_buff *skb)
b580781e
RR		 2354{
2355 struct ieee80211_hw *hw = &local->hw;
2356 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2357 struct sta_info *sta;
2358 struct tid_ampdu_rx *tid_agg_rx;
87228f57 2359 u16 sc;
b580781e
RR		 2360 int tid;
2361
a02ae758
JB		 2362 if (!ieee80211_is_data_qos(hdr->frame_control))
2363 return false;
2364
2365 /*
2366 * filter the QoS data rx stream according to
2367 * STA/TID and check if this STA/TID is on aggregation
2368 */
2369
b580781e
RR		 2370 sta = sta_info_get(local, hdr->addr2);
2371 if (!sta)
a02ae758 2372 return false;
b580781e 2373
238f74a2 2374 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
b580781e 2375
cee24a3e 2376 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
a02ae758 2377 return false;
b580781e 2378
cee24a3e
RR		 2379 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2380
2560b6e2
EG		 2381 /* qos null data frames are excluded */
2382 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a02ae758 2383 return false;
b580781e 2384
a02ae758 2385 /* new, potentially un-ordered, ampdu frame - process it */
b580781e
RR		 2386
2387 /* reset session timer */
20ad19d0
JB		 2388 if (tid_agg_rx->timeout)
2389 mod_timer(&tid_agg_rx->session_timer,
2390 TU_TO_EXP_TIME(tid_agg_rx->timeout));
b580781e
RR		 2391
2392 /* if this mpdu is fragmented - terminate rx aggregation session */
2393 sc = le16_to_cpu(hdr->seq_ctrl);
2394 if (sc & IEEE80211_SCTL_FRAG) {
17741cdc 2395 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
b580781e 2396 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
a02ae758
JB		 2397 dev_kfree_skb(skb);
2398 return true;
b580781e
RR		 2399 }
2400
a02ae758 2401 return ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb);
b580781e
RR		 2402}
2403
6368e4b1
RR		 2404/*
2405 * This is the receive path handler. It is called by a low level driver when an
2406 * 802.11 MPDU is received from the hardware.
2407 */
103bf9f7 2408void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2409{
2410 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2411 struct ieee80211_rate *rate = NULL;
2412 struct ieee80211_supported_band *sband;
f1d58c25 2413 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2414
d20ef63d
JB		 2415 WARN_ON_ONCE(softirq_count() == 0);
2416
77a980dc
JB		 2417 if (WARN_ON(status->band < 0 ||
2418 status->band >= IEEE80211_NUM_BANDS))
2419 goto drop;
8318d78a
JB		 2420
2421 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2422 if (WARN_ON(!sband))
2423 goto drop;
8318d78a 2424
89c3a8ac
JB		 2425 /*
2426 * If we're suspending, it is possible although not too likely
2427 * that we'd be receiving frames after having already partially
2428 * quiesced the stack. We can't process such frames then since
2429 * that might, for example, cause stations to be added or other
2430 * driver callbacks be invoked.
2431 */
77a980dc
JB		 2432 if (unlikely(local->quiescing || local->suspended))
2433 goto drop;
89c3a8ac 2434
ea77f12f
JB		 2435 /*
2436 * The same happens when we're not even started,
2437 * but that's worth a warning.
2438 */
77a980dc
JB		 2439 if (WARN_ON(!local->started))
2440 goto drop;
ea77f12f 2441
0fb8ca45 2442 if (status->flag & RX_FLAG_HT) {
e5d6eb83
LR		 2443 /*
2444 * rate_idx is MCS index, which can be [0-76] as documented on:
2445 *
2446 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2447 *
2448 * Anything else would be some sort of driver or hardware error.
2449 * The driver should catch hardware errors.
2450 */
2451 if (WARN((status->rate_idx < 0 ||
2452 status->rate_idx > 76),
2453 "Rate marked as an HT rate but passed "
2454 "status->rate_idx is not "
2455 "an MCS index [0-76]: %d (0x%02x)\n",
2456 status->rate_idx,
2457 status->rate_idx))
77a980dc 2458 goto drop;
0fb8ca45
JM		 2459 /* HT rates are not in the table - use the highest legacy rate
2460 * for now since other parts of mac80211 may not yet be fully
2461 * MCS aware. */
2462 rate = &sband->bitrates[sband->n_bitrates - 1];
2463 } else {
2464 if (WARN_ON(status->rate_idx < 0 ||
2465 status->rate_idx >= sband->n_bitrates))
77a980dc 2466 goto drop;
0fb8ca45
JM		 2467 rate = &sband->bitrates[status->rate_idx];
2468 }
6368e4b1
RR		 2469
2470 /*
2471 * key references and virtual interfaces are protected using RCU
2472 * and this requires that we are in a read-side RCU section during
2473 * receive processing
2474 */
2475 rcu_read_lock();
2476
2477 /*
2478 * Frames with failed FCS/PLCP checksum are not returned,
2479 * all other frames are returned without radiotap header
2480 * if it was previously present.
2481 * Also, frames with less than 16 bytes are dropped.
2482 */
f1d58c25 2483 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2484 if (!skb) {
2485 rcu_read_unlock();
2486 return;
2487 }
2488
aec67952
JM		 2489 /*
2490 * In theory, the block ack reordering should happen after duplicate
2491 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2492 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2493 * happen as a new RX handler between ieee80211_rx_h_check and
2494 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2495 * the time being, the call can be here since RX reorder buf processing
2496 * will implicitly skip duplicates. We could, in theory at least,
2497 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2498 * frames from other than operational channel), but that should not
2499 * happen in normal networks.
2500 */
f1d58c25
JB		 2501 if (!ieee80211_rx_reorder_ampdu(local, skb))
2502 __ieee80211_rx_handle_packet(hw, skb, rate);
6368e4b1
RR		 2503
2504 rcu_read_unlock();
77a980dc
JB		 2505
2506 return;
2507 drop:
2508 kfree_skb(skb);
6368e4b1 2509}
103bf9f7 2510EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 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 */
f1d58c25 2514void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2515{
2516 struct ieee80211_local *local = hw_to_local(hw);
2517
2518 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2519
571ecf67
JB		 2520 skb->pkt_type = IEEE80211_RX_MSG;
2521 skb_queue_tail(&local->skb_queue, skb);
2522 tasklet_schedule(&local->tasklet);
2523}
2524EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)