rx.c 95.3 KB
Newer Older
1 2 3 4
/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
5
 * Copyright 2007-2010	Johannes Berg <johannes@sipsolutions.net>
6 7 8 9 10 11
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

12
#include <linux/jiffies.h>
13
#include <linux/slab.h>
14 15 16 17
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
18
#include <linux/rcupdate.h>
19
#include <linux/export.h>
20 21
#include <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
22
#include <asm/unaligned.h>
23 24

#include "ieee80211_i.h"
25
#include "driver-ops.h"
J
Johannes Berg 已提交
26
#include "led.h"
27
#include "mesh.h"
28 29 30 31
#include "wep.h"
#include "wpa.h"
#include "tkip.h"
#include "wme.h"
32
#include "rate.h"
33

34 35 36 37 38 39 40
/*
 * monitor mode reception
 *
 * This function cleans up the SKB, i.e. it removes all the stuff
 * only useful for monitoring.
 */
static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
J
Johannes Berg 已提交
41
					   struct sk_buff *skb)
42
{
43 44
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);

45 46
	if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
		if (likely(skb->len > FCS_LEN))
Z
Zhu Yi 已提交
47
			__pskb_trim(skb, skb->len - FCS_LEN);
48 49 50 51
		else {
			/* driver bug */
			WARN_ON(1);
			dev_kfree_skb(skb);
52
			return NULL;
53 54 55
		}
	}

56 57 58
	if (status->vendor_radiotap_len)
		__pskb_pull(skb, status->vendor_radiotap_len);

59 60 61
	return skb;
}

J
Johannes Berg 已提交
62
static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
63
{
64
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
65 66 67
	struct ieee80211_hdr *hdr;

	hdr = (void *)(skb->data + status->vendor_radiotap_len);
68

69 70 71
	if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
			    RX_FLAG_FAILED_PLCP_CRC |
			    RX_FLAG_AMPDU_IS_ZEROLEN))
72
		return 1;
73 74
	if (unlikely(skb->len < 16 + present_fcs_len +
				status->vendor_radiotap_len))
75
		return 1;
H
Harvey Harrison 已提交
76 77 78
	if (ieee80211_is_ctl(hdr->frame_control) &&
	    !ieee80211_is_pspoll(hdr->frame_control) &&
	    !ieee80211_is_back_req(hdr->frame_control))
79 80 81 82
		return 1;
	return 0;
}

83
static int
84 85
ieee80211_rx_radiotap_space(struct ieee80211_local *local,
			    struct ieee80211_rx_status *status)
86 87 88 89
{
	int len;

	/* always present fields */
90
	len = sizeof(struct ieee80211_radiotap_header) + 8;
91

92
	/* allocate extra bitmaps */
93 94
	if (status->vendor_radiotap_len)
		len += 4;
95 96
	if (status->chains)
		len += 4 * hweight8(status->chains);
97 98 99

	if (ieee80211_have_rx_timestamp(status)) {
		len = ALIGN(len, 8);
100
		len += 8;
101
	}
J
Johannes Berg 已提交
102
	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
103 104
		len += 1;

105 106 107 108
	/* antenna field, if we don't have per-chain info */
	if (!status->chains)
		len += 1;

109 110
	/* padding for RX_FLAGS if necessary */
	len = ALIGN(len, 2);
111

112 113 114
	if (status->flag & RX_FLAG_HT) /* HT info */
		len += 3;

115
	if (status->flag & RX_FLAG_AMPDU_DETAILS) {
116
		len = ALIGN(len, 4);
117 118 119
		len += 8;
	}

120 121 122 123 124
	if (status->flag & RX_FLAG_VHT) {
		len = ALIGN(len, 2);
		len += 12;
	}

125 126 127 128 129
	if (status->chains) {
		/* antenna and antenna signal fields */
		len += 2 * hweight8(status->chains);
	}

130 131 132 133 134 135 136 137 138 139 140 141
	if (status->vendor_radiotap_len) {
		if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
			status->vendor_radiotap_align = 1;
		/* align standard part of vendor namespace */
		len = ALIGN(len, 2);
		/* allocate standard part of vendor namespace */
		len += 6;
		/* align vendor-defined part */
		len = ALIGN(len, status->vendor_radiotap_align);
		/* vendor-defined part is already in skb */
	}

142 143 144
	return len;
}

145
/*
146 147 148 149 150 151 152 153
 * ieee80211_add_rx_radiotap_header - add radiotap header
 *
 * add a radiotap header containing all the fields which the hardware provided.
 */
static void
ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
				 struct sk_buff *skb,
				 struct ieee80211_rate *rate,
154
				 int rtap_len, bool has_fcs)
155
{
156
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
157 158
	struct ieee80211_radiotap_header *rthdr;
	unsigned char *pos;
159 160
	__le32 *it_present;
	u32 it_present_val;
161
	u16 rx_flags = 0;
162
	u16 channel_flags = 0;
163 164
	int mpdulen, chain;
	unsigned long chains = status->chains;
165 166 167 168

	mpdulen = skb->len;
	if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
		mpdulen += FCS_LEN;
169 170 171

	rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
	memset(rthdr, 0, rtap_len);
172
	it_present = &rthdr->it_present;
173 174

	/* radiotap header, set always present flags */
175
	rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
	it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
			 BIT(IEEE80211_RADIOTAP_CHANNEL) |
			 BIT(IEEE80211_RADIOTAP_RX_FLAGS);

	if (!status->chains)
		it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);

	for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
		it_present_val |=
			BIT(IEEE80211_RADIOTAP_EXT) |
			BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
		put_unaligned_le32(it_present_val, it_present);
		it_present++;
		it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
				 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
	}
192

193
	if (status->vendor_radiotap_len) {
194 195 196 197 198
		it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
				  BIT(IEEE80211_RADIOTAP_EXT);
		put_unaligned_le32(it_present_val, it_present);
		it_present++;
		it_present_val = status->vendor_radiotap_bitmap;
199 200
	}

201 202 203 204
	put_unaligned_le32(it_present_val, it_present);

	pos = (void *)(it_present + 1);

205 206 207
	/* the order of the following fields is important */

	/* IEEE80211_RADIOTAP_TSFT */
208
	if (ieee80211_have_rx_timestamp(status)) {
209 210 211
		/* padding */
		while ((pos - (u8 *)rthdr) & 7)
			*pos++ = 0;
212 213 214 215
		put_unaligned_le64(
			ieee80211_calculate_rx_timestamp(local, status,
							 mpdulen, 0),
			pos);
J
Johannes Berg 已提交
216
		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
217 218 219 220
		pos += 8;
	}

	/* IEEE80211_RADIOTAP_FLAGS */
221
	if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
222
		*pos |= IEEE80211_RADIOTAP_F_FCS;
J
Johannes Berg 已提交
223 224
	if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
		*pos |= IEEE80211_RADIOTAP_F_BADFCS;
225 226
	if (status->flag & RX_FLAG_SHORTPRE)
		*pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
227 228 229
	pos++;

	/* IEEE80211_RADIOTAP_RATE */
230
	if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
231
		/*
232
		 * Without rate information don't add it. If we have,
233
		 * MCS information is a separate field in radiotap,
234 235
		 * added below. The byte here is needed as padding
		 * for the channel though, so initialise it to 0.
236 237
		 */
		*pos = 0;
238
	} else {
239
		int shift = 0;
240
		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
241 242 243 244 245
		if (status->flag & RX_FLAG_10MHZ)
			shift = 1;
		else if (status->flag & RX_FLAG_5MHZ)
			shift = 2;
		*pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
246
	}
247 248 249
	pos++;

	/* IEEE80211_RADIOTAP_CHANNEL */
250
	put_unaligned_le16(status->freq, pos);
251
	pos += 2;
252 253 254 255 256
	if (status->flag & RX_FLAG_10MHZ)
		channel_flags |= IEEE80211_CHAN_HALF;
	else if (status->flag & RX_FLAG_5MHZ)
		channel_flags |= IEEE80211_CHAN_QUARTER;

257
	if (status->band == IEEE80211_BAND_5GHZ)
258
		channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
259
	else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
260
		channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
261
	else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
262
		channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
263
	else if (rate)
264
		channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
265
	else
266 267
		channel_flags |= IEEE80211_CHAN_2GHZ;
	put_unaligned_le16(channel_flags, pos);
268 269 270
	pos += 2;

	/* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
271 272
	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
	    !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
273 274 275 276 277 278 279 280
		*pos = status->signal;
		rthdr->it_present |=
			cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
		pos++;
	}

	/* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */

281 282 283 284 285
	if (!status->chains) {
		/* IEEE80211_RADIOTAP_ANTENNA */
		*pos = status->antenna;
		pos++;
	}
286 287 288 289 290

	/* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */

	/* IEEE80211_RADIOTAP_RX_FLAGS */
	/* ensure 2 byte alignment for the 2 byte field as required */
291
	if ((pos - (u8 *)rthdr) & 1)
292
		*pos++ = 0;
J
Johannes Berg 已提交
293
	if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
294 295
		rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
	put_unaligned_le16(rx_flags, pos);
296
	pos += 2;
297 298

	if (status->flag & RX_FLAG_HT) {
299 300
		unsigned int stbc;

301
		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
302
		*pos++ = local->hw.radiotap_mcs_details;
303 304 305 306 307
		*pos = 0;
		if (status->flag & RX_FLAG_SHORT_GI)
			*pos |= IEEE80211_RADIOTAP_MCS_SGI;
		if (status->flag & RX_FLAG_40MHZ)
			*pos |= IEEE80211_RADIOTAP_MCS_BW_40;
308 309
		if (status->flag & RX_FLAG_HT_GF)
			*pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
310 311
		stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
		*pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
312 313 314
		pos++;
		*pos++ = status->rate_idx;
	}
315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345

	if (status->flag & RX_FLAG_AMPDU_DETAILS) {
		u16 flags = 0;

		/* ensure 4 byte alignment */
		while ((pos - (u8 *)rthdr) & 3)
			pos++;
		rthdr->it_present |=
			cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
		put_unaligned_le32(status->ampdu_reference, pos);
		pos += 4;
		if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
			flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
		if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
			flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
		if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
			flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
		if (status->flag & RX_FLAG_AMPDU_IS_LAST)
			flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
		if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
			flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
		if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
			flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
		put_unaligned_le16(flags, pos);
		pos += 2;
		if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
			*pos++ = status->ampdu_delimiter_crc;
		else
			*pos++ = 0;
		*pos++ = 0;
	}
346

347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381
	if (status->flag & RX_FLAG_VHT) {
		u16 known = local->hw.radiotap_vht_details;

		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
		/* known field - how to handle 80+80? */
		if (status->flag & RX_FLAG_80P80MHZ)
			known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
		put_unaligned_le16(known, pos);
		pos += 2;
		/* flags */
		if (status->flag & RX_FLAG_SHORT_GI)
			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
		pos++;
		/* bandwidth */
		if (status->flag & RX_FLAG_80MHZ)
			*pos++ = 4;
		else if (status->flag & RX_FLAG_80P80MHZ)
			*pos++ = 0; /* marked not known above */
		else if (status->flag & RX_FLAG_160MHZ)
			*pos++ = 11;
		else if (status->flag & RX_FLAG_40MHZ)
			*pos++ = 1;
		else /* 20 MHz */
			*pos++ = 0;
		/* MCS/NSS */
		*pos = (status->rate_idx << 4) | status->vht_nss;
		pos += 4;
		/* coding field */
		pos++;
		/* group ID */
		pos++;
		/* partial_aid */
		pos += 2;
	}

382 383 384 385 386
	for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
		*pos++ = status->chain_signal[chain];
		*pos++ = chain;
	}

387 388 389 390 391 392 393 394 395 396 397 398 399 400
	if (status->vendor_radiotap_len) {
		/* ensure 2 byte alignment for the vendor field as required */
		if ((pos - (u8 *)rthdr) & 1)
			*pos++ = 0;
		*pos++ = status->vendor_radiotap_oui[0];
		*pos++ = status->vendor_radiotap_oui[1];
		*pos++ = status->vendor_radiotap_oui[2];
		*pos++ = status->vendor_radiotap_subns;
		put_unaligned_le16(status->vendor_radiotap_len, pos);
		pos += 2;
		/* align the actual payload as requested */
		while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
			*pos++ = 0;
	}
401 402
}

403 404 405 406 407 408 409
/*
 * This function copies a received frame to all monitor interfaces and
 * returns a cleaned-up SKB that no longer includes the FCS nor the
 * radiotap header the driver might have added.
 */
static struct sk_buff *
ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
410
		     struct ieee80211_rate *rate)
411
{
412
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
413
	struct ieee80211_sub_if_data *sdata;
414
	int needed_headroom;
415 416 417 418 419 420 421 422 423 424 425 426
	struct sk_buff *skb, *skb2;
	struct net_device *prev_dev = NULL;
	int present_fcs_len = 0;

	/*
	 * First, we may need to make a copy of the skb because
	 *  (1) we need to modify it for radiotap (if not present), and
	 *  (2) the other RX handlers will modify the skb we got.
	 *
	 * We don't need to, of course, if we aren't going to return
	 * the SKB because it has a bad FCS/PLCP checksum.
	 */
J
Johannes Berg 已提交
427

428 429 430
	if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
		present_fcs_len = FCS_LEN;

431 432
	/* ensure hdr->frame_control and vendor radiotap data are in skb head */
	if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
Z
Zhu Yi 已提交
433 434 435 436
		dev_kfree_skb(origskb);
		return NULL;
	}

437
	if (!local->monitors) {
J
Johannes Berg 已提交
438
		if (should_drop_frame(origskb, present_fcs_len)) {
439 440 441 442
			dev_kfree_skb(origskb);
			return NULL;
		}

J
Johannes Berg 已提交
443
		return remove_monitor_info(local, origskb);
444 445
	}

446 447 448
	/* room for the radiotap header based on driver features */
	needed_headroom = ieee80211_rx_radiotap_space(local, status);

J
Johannes Berg 已提交
449
	if (should_drop_frame(origskb, present_fcs_len)) {
450 451 452 453 454 455 456 457 458 459 460 461
		/* only need to expand headroom if necessary */
		skb = origskb;
		origskb = NULL;

		/*
		 * This shouldn't trigger often because most devices have an
		 * RX header they pull before we get here, and that should
		 * be big enough for our radiotap information. We should
		 * probably export the length to drivers so that we can have
		 * them allocate enough headroom to start with.
		 */
		if (skb_headroom(skb) < needed_headroom &&
462
		    pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
463 464 465 466 467 468 469 470 471 472
			dev_kfree_skb(skb);
			return NULL;
		}
	} else {
		/*
		 * Need to make a copy and possibly remove radiotap header
		 * and FCS from the original.
		 */
		skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);

J
Johannes Berg 已提交
473
		origskb = remove_monitor_info(local, origskb);
474 475 476 477 478

		if (!skb)
			return origskb;
	}

J
Johannes Berg 已提交
479
	/* prepend radiotap information */
480 481
	ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
					 true);
482

483
	skb_reset_mac_header(skb);
484 485 486 487 488
	skb->ip_summed = CHECKSUM_UNNECESSARY;
	skb->pkt_type = PACKET_OTHERHOST;
	skb->protocol = htons(ETH_P_802_2);

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
489
		if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
490 491
			continue;

492 493 494
		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
			continue;

495
		if (!ieee80211_sdata_running(sdata))
496 497
			continue;

498 499 500 501
		if (prev_dev) {
			skb2 = skb_clone(skb, GFP_ATOMIC);
			if (skb2) {
				skb2->dev = prev_dev;
502
				netif_receive_skb(skb2);
503 504 505 506 507 508 509 510 511 512
			}
		}

		prev_dev = sdata->dev;
		sdata->dev->stats.rx_packets++;
		sdata->dev->stats.rx_bytes += skb->len;
	}

	if (prev_dev) {
		skb->dev = prev_dev;
513
		netif_receive_skb(skb);
514 515 516 517 518 519
	} else
		dev_kfree_skb(skb);

	return origskb;
}

520
static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
521
{
522
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
523
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
524
	int tid, seqno_idx, security_idx;
525 526

	/* does the frame have a qos control field? */
527 528
	if (ieee80211_is_data_qos(hdr->frame_control)) {
		u8 *qc = ieee80211_get_qos_ctl(hdr);
529
		/* frame has qos control */
530
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
531
		if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
532
			status->rx_flags |= IEEE80211_RX_AMSDU;
533 534 535

		seqno_idx = tid;
		security_idx = tid;
536
	} else {
537 538 539 540 541 542 543 544 545 546 547
		/*
		 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
		 *
		 *	Sequence numbers for management frames, QoS data
		 *	frames with a broadcast/multicast address in the
		 *	Address 1 field, and all non-QoS data frames sent
		 *	by QoS STAs are assigned using an additional single
		 *	modulo-4096 counter, [...]
		 *
		 * We also use that counter for non-QoS STAs.
		 */
548
		seqno_idx = IEEE80211_NUM_TIDS;
549 550
		security_idx = 0;
		if (ieee80211_is_mgmt(hdr->frame_control))
551
			security_idx = IEEE80211_NUM_TIDS;
552
		tid = 0;
553
	}
554

555 556
	rx->seqno_idx = seqno_idx;
	rx->security_idx = security_idx;
557 558 559
	/* Set skb->priority to 1d tag if highest order bit of TID is not set.
	 * For now, set skb->priority to 0 for other cases. */
	rx->skb->priority = (tid > 7) ? 0 : tid;
560
}
561

562 563 564 565 566 567 568 569 570 571 572
/**
 * DOC: Packet alignment
 *
 * Drivers always need to pass packets that are aligned to two-byte boundaries
 * to the stack.
 *
 * Additionally, should, if possible, align the payload data in a way that
 * guarantees that the contained IP header is aligned to a four-byte
 * boundary. In the case of regular frames, this simply means aligning the
 * payload to a four-byte boundary (because either the IP header is directly
 * contained, or IV/RFC1042 headers that have a length divisible by four are
573 574 575
 * in front of it).  If the payload data is not properly aligned and the
 * architecture doesn't support efficient unaligned operations, mac80211
 * will align the data.
576 577 578 579 580 581 582
 *
 * With A-MSDU frames, however, the payload data address must yield two modulo
 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 * push the IP header further back to a multiple of four again. Thankfully, the
 * specs were sane enough this time around to require padding each A-MSDU
 * subframe to a length that is a multiple of four.
 *
L
Lucas De Marchi 已提交
583
 * Padding like Atheros hardware adds which is between the 802.11 header and
584 585 586 587
 * the payload is not supported, the driver is required to move the 802.11
 * header to be directly in front of the payload in that case.
 */
static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
588
{
589 590 591
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
	WARN_ONCE((unsigned long)rx->skb->data & 1,
		  "unaligned packet at 0x%p\n", rx->skb->data);
592
#endif
593 594
}

595

596 597
/* rx handlers */

598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625
static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;

	if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
		return 0;

	return ieee80211_is_robust_mgmt_frame(hdr);
}


static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;

	if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
		return 0;

	return ieee80211_is_robust_mgmt_frame(hdr);
}


/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
{
	struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
	struct ieee80211_mmie *mmie;

J
Johannes Berg 已提交
626
	if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
627 628 629 630 631 632 633 634 635 636 637 638 639 640
		return -1;

	if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
		return -1; /* not a robust management frame */

	mmie = (struct ieee80211_mmie *)
		(skb->data + skb->len - sizeof(*mmie));
	if (mmie->element_id != WLAN_EID_MMIE ||
	    mmie->length != sizeof(*mmie) - 2)
		return -1;

	return le16_to_cpu(mmie->key_id);
}

J
Johannes Berg 已提交
641
static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
642
{
643
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
644
	char *dev_addr = rx->sdata->vif.addr;
645

646
	if (ieee80211_is_data(hdr->frame_control)) {
647 648
		if (is_multicast_ether_addr(hdr->addr1)) {
			if (ieee80211_has_tods(hdr->frame_control) ||
J
Johannes Berg 已提交
649
			    !ieee80211_has_fromds(hdr->frame_control))
650
				return RX_DROP_MONITOR;
651
			if (ether_addr_equal(hdr->addr3, dev_addr))
652 653 654 655
				return RX_DROP_MONITOR;
		} else {
			if (!ieee80211_has_a4(hdr->frame_control))
				return RX_DROP_MONITOR;
656
			if (ether_addr_equal(hdr->addr4, dev_addr))
657 658
				return RX_DROP_MONITOR;
		}
659 660 661 662 663 664
	}

	/* If there is not an established peer link and this is not a peer link
	 * establisment frame, beacon or probe, drop the frame.
	 */

665
	if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
666
		struct ieee80211_mgmt *mgmt;
667

668
		if (!ieee80211_is_mgmt(hdr->frame_control))
669 670
			return RX_DROP_MONITOR;

671
		if (ieee80211_is_action(hdr->frame_control)) {
672
			u8 category;
673 674 675 676 677

			/* make sure category field is present */
			if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
				return RX_DROP_MONITOR;

678
			mgmt = (struct ieee80211_mgmt *)hdr;
679 680
			category = mgmt->u.action.category;
			if (category != WLAN_CATEGORY_MESH_ACTION &&
J
Johannes Berg 已提交
681
			    category != WLAN_CATEGORY_SELF_PROTECTED)
682 683 684 685
				return RX_DROP_MONITOR;
			return RX_CONTINUE;
		}

686 687
		if (ieee80211_is_probe_req(hdr->frame_control) ||
		    ieee80211_is_probe_resp(hdr->frame_control) ||
688 689
		    ieee80211_is_beacon(hdr->frame_control) ||
		    ieee80211_is_auth(hdr->frame_control))
690 691 692 693 694
			return RX_CONTINUE;

		return RX_DROP_MONITOR;
	}

J
Johannes Berg 已提交
695 696
	return RX_CONTINUE;
}
697

698
static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
699
					    struct tid_ampdu_rx *tid_agg_rx,
700 701
					    int index,
					    struct sk_buff_head *frames)
702 703
{
	struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
704
	struct ieee80211_rx_status *status;
705

706 707
	lockdep_assert_held(&tid_agg_rx->reorder_lock);

708 709 710
	if (!skb)
		goto no_frame;

711
	/* release the frame from the reorder ring buffer */
712 713
	tid_agg_rx->stored_mpdu_num--;
	tid_agg_rx->reorder_buf[index] = NULL;
714 715
	status = IEEE80211_SKB_RXCB(skb);
	status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
716
	__skb_queue_tail(frames, skb);
717 718

no_frame:
719
	tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
720 721
}

722
static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
723
					     struct tid_ampdu_rx *tid_agg_rx,
724 725
					     u16 head_seq_num,
					     struct sk_buff_head *frames)
726 727 728
{
	int index;

729 730
	lockdep_assert_held(&tid_agg_rx->reorder_lock);

731 732 733
	while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
		index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
					 tid_agg_rx->ssn) %
734
							tid_agg_rx->buf_size;
735 736
		ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
						frames);
737 738 739 740 741 742 743 744 745
	}
}

/*
 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 * the skb was added to the buffer longer than this time ago, the earlier
 * frames that have not yet been received are assumed to be lost and the skb
 * can be released for processing. This may also release other skb's from the
 * reorder buffer if there are no additional gaps between the frames.
746 747
 *
 * Callers must hold tid_agg_rx->reorder_lock.
748 749 750
 */
#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)

751
static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
752 753
					  struct tid_ampdu_rx *tid_agg_rx,
					  struct sk_buff_head *frames)
754
{
755
	int index, j;
756

757 758
	lockdep_assert_held(&tid_agg_rx->reorder_lock);

759
	/* release the buffer until next missing frame */
760 761
	index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
				 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
762
	if (!tid_agg_rx->reorder_buf[index] &&
763
	    tid_agg_rx->stored_mpdu_num) {
764 765 766 767 768 769 770 771 772 773 774
		/*
		 * No buffers ready to be released, but check whether any
		 * frames in the reorder buffer have timed out.
		 */
		int skipped = 1;
		for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
		     j = (j + 1) % tid_agg_rx->buf_size) {
			if (!tid_agg_rx->reorder_buf[j]) {
				skipped++;
				continue;
			}
775 776
			if (skipped &&
			    !time_after(jiffies, tid_agg_rx->reorder_time[j] +
777
					HT_RX_REORDER_BUF_TIMEOUT))
778
				goto set_release_timer;
779

J
Johannes Berg 已提交
780 781
			ht_dbg_ratelimited(sdata,
					   "release an RX reorder frame due to timeout on earlier frames\n");
782 783
			ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
							frames);
784 785 786 787 788

			/*
			 * Increment the head seq# also for the skipped slots.
			 */
			tid_agg_rx->head_seq_num =
789 790
				(tid_agg_rx->head_seq_num +
				 skipped) & IEEE80211_SN_MASK;
791 792 793
			skipped = 0;
		}
	} else while (tid_agg_rx->reorder_buf[index]) {
794 795
		ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
						frames);
796 797
		index =	ieee80211_sn_sub(tid_agg_rx->head_seq_num,
					 tid_agg_rx->ssn) %
798 799
							tid_agg_rx->buf_size;
	}
800 801

	if (tid_agg_rx->stored_mpdu_num) {
802 803 804
		j = index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
					     tid_agg_rx->ssn) %
							tid_agg_rx->buf_size;
805 806 807 808 809 810 811 812 813 814

		for (; j != (index - 1) % tid_agg_rx->buf_size;
		     j = (j + 1) % tid_agg_rx->buf_size) {
			if (tid_agg_rx->reorder_buf[j])
				break;
		}

 set_release_timer:

		mod_timer(&tid_agg_rx->reorder_timer,
815
			  tid_agg_rx->reorder_time[j] + 1 +
816 817 818 819
			  HT_RX_REORDER_BUF_TIMEOUT);
	} else {
		del_timer(&tid_agg_rx->reorder_timer);
	}
820 821
}

822 823 824 825 826
/*
 * As this function belongs to the RX path it must be under
 * rcu_read_lock protection. It returns false if the frame
 * can be processed immediately, true if it was consumed.
 */
827
static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
828
					     struct tid_ampdu_rx *tid_agg_rx,
829 830
					     struct sk_buff *skb,
					     struct sk_buff_head *frames)
831 832 833 834 835 836
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	u16 sc = le16_to_cpu(hdr->seq_ctrl);
	u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
	u16 head_seq_num, buf_size;
	int index;
837
	bool ret = true;
838

839 840
	spin_lock(&tid_agg_rx->reorder_lock);

841 842 843 844
	buf_size = tid_agg_rx->buf_size;
	head_seq_num = tid_agg_rx->head_seq_num;

	/* frame with out of date sequence number */
845
	if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
846
		dev_kfree_skb(skb);
847
		goto out;
848 849 850 851 852 853
	}

	/*
	 * If frame the sequence number exceeds our buffering window
	 * size release some previous frames to make room for this one.
	 */
854 855 856
	if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
		head_seq_num = ieee80211_sn_inc(
				ieee80211_sn_sub(mpdu_seq_num, buf_size));
857
		/* release stored frames up to new head to stack */
858
		ieee80211_release_reorder_frames(sdata, tid_agg_rx,
859
						 head_seq_num, frames);
860 861 862 863
	}

	/* Now the new frame is always in the range of the reordering buffer */

864 865
	index = ieee80211_sn_sub(mpdu_seq_num,
				 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
866 867 868 869

	/* check if we already stored this frame */
	if (tid_agg_rx->reorder_buf[index]) {
		dev_kfree_skb(skb);
870
		goto out;
871 872 873 874 875
	}

	/*
	 * If the current MPDU is in the right order and nothing else
	 * is stored we can process it directly, no need to buffer it.
876 877
	 * If it is first but there's something stored, we may be able
	 * to release frames after this one.
878 879 880
	 */
	if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
	    tid_agg_rx->stored_mpdu_num == 0) {
881 882
		tid_agg_rx->head_seq_num =
			ieee80211_sn_inc(tid_agg_rx->head_seq_num);
883 884
		ret = false;
		goto out;
885 886 887 888 889 890
	}

	/* put the frame in the reordering buffer */
	tid_agg_rx->reorder_buf[index] = skb;
	tid_agg_rx->reorder_time[index] = jiffies;
	tid_agg_rx->stored_mpdu_num++;
891
	ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
892

893 894 895
 out:
	spin_unlock(&tid_agg_rx->reorder_lock);
	return ret;
896 897 898 899 900 901
}

/*
 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 * true if the MPDU was buffered, false if it should be processed.
 */
902 903
static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
				       struct sk_buff_head *frames)
904
{
905 906
	struct sk_buff *skb = rx->skb;
	struct ieee80211_local *local = rx->local;
907
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
908
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
909
	struct sta_info *sta = rx->sta;
910 911
	struct tid_ampdu_rx *tid_agg_rx;
	u16 sc;
912
	u8 tid, ack_policy;
913 914

	if (!ieee80211_is_data_qos(hdr->frame_control))
915
		goto dont_reorder;
916 917 918 919 920 921 922

	/*
	 * filter the QoS data rx stream according to
	 * STA/TID and check if this STA/TID is on aggregation
	 */

	if (!sta)
923
		goto dont_reorder;
924

925 926
	ack_policy = *ieee80211_get_qos_ctl(hdr) &
		     IEEE80211_QOS_CTL_ACK_POLICY_MASK;
927 928
	tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;

929 930 931
	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
	if (!tid_agg_rx)
		goto dont_reorder;
932 933 934

	/* qos null data frames are excluded */
	if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
935
		goto dont_reorder;
936

937 938 939 940 941
	/* not part of a BA session */
	if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
	    ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
		goto dont_reorder;

942 943 944 945
	/* not actually part of this BA session */
	if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
		goto dont_reorder;

946 947 948 949
	/* new, potentially un-ordered, ampdu frame - process it */

	/* reset session timer */
	if (tid_agg_rx->timeout)
950
		tid_agg_rx->last_rx = jiffies;
951 952 953 954

	/* if this mpdu is fragmented - terminate rx aggregation session */
	sc = le16_to_cpu(hdr->seq_ctrl);
	if (sc & IEEE80211_SCTL_FRAG) {
955
		skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
956 957
		skb_queue_tail(&rx->sdata->skb_queue, skb);
		ieee80211_queue_work(&local->hw, &rx->sdata->work);
958
		return;
959 960
	}

961 962 963 964 965 966 967
	/*
	 * No locking needed -- we will only ever process one
	 * RX packet at a time, and thus own tid_agg_rx. All
	 * other code manipulating it needs to (and does) make
	 * sure that we cannot get to it any more before doing
	 * anything with it.
	 */
968 969
	if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
					     frames))
970 971 972
		return;

 dont_reorder:
973
	__skb_queue_tail(frames, skb);
974
}
975

976
static ieee80211_rx_result debug_noinline
977
ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
978
{
979
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
980
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
981

982 983 984 985 986 987 988 989
	/*
	 * Drop duplicate 802.11 retransmissions
	 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
	 */
	if (rx->skb->len >= 24 && rx->sta &&
	    !ieee80211_is_ctl(hdr->frame_control) &&
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
	    !is_multicast_ether_addr(hdr->addr1)) {
990
		if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
991
			     rx->sta->last_seq_ctrl[rx->seqno_idx] ==
992
			     hdr->seq_ctrl)) {
993
			if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
994 995 996
				rx->local->dot11FrameDuplicateCount++;
				rx->sta->num_duplicates++;
			}
997
			return RX_DROP_UNUSABLE;
998
		} else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
999
			rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1000
		}
1001 1002 1003 1004
	}

	if (unlikely(rx->skb->len < 16)) {
		I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
J
Johannes Berg 已提交
1005
		return RX_DROP_MONITOR;
1006 1007 1008 1009 1010
	}

	/* Drop disallowed frame classes based on STA auth/assoc state;
	 * IEEE 802.11, Chap 5.5.
	 *
J
Johannes Berg 已提交
1011 1012
	 * mac80211 filters only based on association state, i.e. it drops
	 * Class 3 frames from not associated stations. hostapd sends
1013 1014 1015
	 * deauth/disassoc frames when needed. In addition, hostapd is
	 * responsible for filtering on both auth and assoc states.
	 */
1016

J
Johannes Berg 已提交
1017
	if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1018 1019
		return ieee80211_rx_mesh_check(rx);

1020 1021
	if (unlikely((ieee80211_is_data(hdr->frame_control) ||
		      ieee80211_is_pspoll(hdr->frame_control)) &&
1022
		     rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
B
Bill Jordan 已提交
1023
		     rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
J
Johannes Berg 已提交
1024
		     (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1025 1026 1027 1028 1029 1030
		/*
		 * accept port control frames from the AP even when it's not
		 * yet marked ASSOC to prevent a race where we don't set the
		 * assoc bit quickly enough before it sends the first frame
		 */
		if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1031
		    ieee80211_is_data_present(hdr->frame_control)) {
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
			unsigned int hdrlen;
			__be16 ethertype;

			hdrlen = ieee80211_hdrlen(hdr->frame_control);

			if (rx->skb->len < hdrlen + 8)
				return RX_DROP_MONITOR;

			skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
			if (ethertype == rx->sdata->control_port_protocol)
1042 1043
				return RX_CONTINUE;
		}
1044 1045 1046 1047 1048 1049 1050

		if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
		    cfg80211_rx_spurious_frame(rx->sdata->dev,
					       hdr->addr2,
					       GFP_ATOMIC))
			return RX_DROP_UNUSABLE;

J
Johannes Berg 已提交
1051
		return RX_DROP_MONITOR;
1052
	}
1053

1054
	return RX_CONTINUE;
1055 1056 1057
}


1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
{
	struct ieee80211_local *local;
	struct ieee80211_hdr *hdr;
	struct sk_buff *skb;

	local = rx->local;
	skb = rx->skb;
	hdr = (struct ieee80211_hdr *) skb->data;

	if (!local->pspolling)
		return RX_CONTINUE;

	if (!ieee80211_has_fromds(hdr->frame_control))
		/* this is not from AP */
		return RX_CONTINUE;

	if (!ieee80211_is_data(hdr->frame_control))
		return RX_CONTINUE;

	if (!ieee80211_has_moredata(hdr->frame_control)) {
		/* AP has no more frames buffered for us */
		local->pspolling = false;
		return RX_CONTINUE;
	}

	/* more data bit is set, let's request a new frame from the AP */
	ieee80211_send_pspoll(local, rx->sdata);

	return RX_CONTINUE;
}

1091
static void sta_ps_start(struct sta_info *sta)
1092
{
1093
	struct ieee80211_sub_if_data *sdata = sta->sdata;
1094
	struct ieee80211_local *local = sdata->local;
1095
	struct ps_data *ps;
1096

1097 1098 1099 1100 1101 1102 1103
	if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
	    sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
		ps = &sdata->bss->ps;
	else
		return;

	atomic_inc(&ps->num_sta_ps);
J
Johannes Berg 已提交
1104
	set_sta_flag(sta, WLAN_STA_PS_STA);
1105 1106
	if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
		drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
J
Johannes Berg 已提交
1107 1108
	ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
	       sta->sta.addr, sta->sta.aid);
1109 1110
}

1111
static void sta_ps_end(struct sta_info *sta)
1112
{
J
Johannes Berg 已提交
1113 1114
	ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
	       sta->sta.addr, sta->sta.aid);
1115

J
Johannes Berg 已提交
1116
	if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
J
Johannes Berg 已提交
1117 1118
		ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
		       sta->sta.addr, sta->sta.aid);
1119 1120 1121 1122
		return;
	}

	ieee80211_sta_ps_deliver_wakeup(sta);
1123 1124
}

1125 1126 1127 1128 1129 1130 1131 1132
int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
{
	struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
	bool in_ps;

	WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));

	/* Don't let the same PS state be set twice */
J
Johannes Berg 已提交
1133
	in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1134 1135 1136 1137
	if ((start && in_ps) || (!start && !in_ps))
		return -EINVAL;

	if (start)
1138
		sta_ps_start(sta_inf);
1139
	else
1140
		sta_ps_end(sta_inf);
1141 1142 1143 1144 1145

	return 0;
}
EXPORT_SYMBOL(ieee80211_sta_ps_transition);

J
Johannes Berg 已提交
1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
{
	struct ieee80211_sub_if_data *sdata = rx->sdata;
	struct ieee80211_hdr *hdr = (void *)rx->skb->data;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
	int tid, ac;

	if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
		return RX_CONTINUE;

	if (sdata->vif.type != NL80211_IFTYPE_AP &&
	    sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
		return RX_CONTINUE;

	/*
	 * The device handles station powersave, so don't do anything about
	 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
	 * it to mac80211 since they're handled.)
	 */
	if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
		return RX_CONTINUE;

	/*
	 * Don't do anything if the station isn't already asleep. In
	 * the uAPSD case, the station will probably be marked asleep,
	 * in the PS-Poll case the station must be confused ...
	 */
J
Johannes Berg 已提交
1174
	if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
J
Johannes Berg 已提交
1175 1176 1177
		return RX_CONTINUE;

	if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
J
Johannes Berg 已提交
1178 1179
		if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
			if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1180 1181
				ieee80211_sta_ps_deliver_poll_response(rx->sta);
			else
J
Johannes Berg 已提交
1182
				set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1183
		}
J
Johannes Berg 已提交
1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208

		/* Free PS Poll skb here instead of returning RX_DROP that would
		 * count as an dropped frame. */
		dev_kfree_skb(rx->skb);

		return RX_QUEUED;
	} else if (!ieee80211_has_morefrags(hdr->frame_control) &&
		   !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
		   ieee80211_has_pm(hdr->frame_control) &&
		   (ieee80211_is_data_qos(hdr->frame_control) ||
		    ieee80211_is_qos_nullfunc(hdr->frame_control))) {
		tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
		ac = ieee802_1d_to_ac[tid & 7];

		/*
		 * If this AC is not trigger-enabled do nothing.
		 *
		 * NB: This could/should check a separate bitmap of trigger-
		 * enabled queues, but for now we only implement uAPSD w/o
		 * TSPEC changes to the ACs, so they're always the same.
		 */
		if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
			return RX_CONTINUE;

		/* if we are in a service period, do nothing */
J
Johannes Berg 已提交
1209
		if (test_sta_flag(rx->sta, WLAN_STA_SP))
J
Johannes Berg 已提交
1210 1211
			return RX_CONTINUE;

J
Johannes Berg 已提交
1212
		if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
J
Johannes Berg 已提交
1213 1214
			ieee80211_sta_ps_deliver_uapsd(rx->sta);
		else
J
Johannes Berg 已提交
1215
			set_sta_flag(rx->sta, WLAN_STA_UAPSD);
J
Johannes Berg 已提交
1216 1217 1218 1219 1220
	}

	return RX_CONTINUE;
}

1221
static ieee80211_rx_result debug_noinline
1222
ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1223 1224
{
	struct sta_info *sta = rx->sta;
J
Johannes Berg 已提交
1225 1226 1227
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1228
	int i;
1229 1230

	if (!sta)
1231
		return RX_CONTINUE;
1232

J
Johannes Berg 已提交
1233 1234
	/*
	 * Update last_rx only for IBSS packets which are for the current
1235 1236 1237 1238 1239
	 * BSSID and for station already AUTHORIZED to avoid keeping the
	 * current IBSS network alive in cases where other STAs start
	 * using different BSSID. This will also give the station another
	 * chance to restart the authentication/authorization in case
	 * something went wrong the first time.
J
Johannes Berg 已提交
1240
	 */
1241
	if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1242
		u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1243
						NL80211_IFTYPE_ADHOC);
1244 1245
		if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
		    test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1246
			sta->last_rx = jiffies;
1247 1248 1249
			if (ieee80211_is_data(hdr->frame_control)) {
				sta->last_rx_rate_idx = status->rate_idx;
				sta->last_rx_rate_flag = status->flag;
1250
				sta->last_rx_rate_vht_nss = status->vht_nss;
1251 1252
			}
		}
J
Johannes Berg 已提交
1253 1254
	} else if (!is_multicast_ether_addr(hdr->addr1)) {
		/*
1255 1256
		 * Mesh beacons will update last_rx when if they are found to
		 * match the current local configuration when processed.
1257
		 */
J
Johannes Berg 已提交
1258
		sta->last_rx = jiffies;
1259 1260 1261
		if (ieee80211_is_data(hdr->frame_control)) {
			sta->last_rx_rate_idx = status->rate_idx;
			sta->last_rx_rate_flag = status->flag;
1262
			sta->last_rx_rate_vht_nss = status->vht_nss;
1263
		}
1264 1265
	}

1266
	if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1267
		return RX_CONTINUE;
1268

1269 1270 1271
	if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
		ieee80211_sta_rx_notify(rx->sdata, hdr);

1272 1273
	sta->rx_fragments++;
	sta->rx_bytes += rx->skb->len;
1274 1275 1276 1277
	if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
		sta->last_signal = status->signal;
		ewma_add(&sta->avg_signal, -status->signal);
	}
1278

1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291
	if (status->chains) {
		sta->chains = status->chains;
		for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
			int signal = status->chain_signal[i];

			if (!(status->chains & BIT(i)))
				continue;

			sta->chain_signal_last[i] = signal;
			ewma_add(&sta->chain_signal_avg[i], -signal);
		}
	}

1292 1293 1294 1295
	/*
	 * Change STA power saving mode only at the end of a frame
	 * exchange sequence.
	 */
1296 1297
	if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
	    !ieee80211_has_morefrags(hdr->frame_control) &&
1298
	    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1299 1300
	    (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
	     rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
J
Johannes Berg 已提交
1301
		if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1302 1303 1304 1305 1306 1307 1308 1309 1310 1311
			/*
			 * Ignore doze->wake transitions that are
			 * indicated by non-data frames, the standard
			 * is unclear here, but for example going to
			 * PS mode and then scanning would cause a
			 * doze->wake transition for the probe request,
			 * and that is clearly undesirable.
			 */
			if (ieee80211_is_data(hdr->frame_control) &&
			    !ieee80211_has_pm(hdr->frame_control))
1312
				sta_ps_end(sta);
1313 1314
		} else {
			if (ieee80211_has_pm(hdr->frame_control))
1315
				sta_ps_start(sta);
1316
		}
1317 1318
	}

M
Marco Porsch 已提交
1319 1320 1321 1322
	/* mesh power save support */
	if (ieee80211_vif_is_mesh(&rx->sdata->vif))
		ieee80211_mps_rx_h_sta_process(sta, hdr);

1323 1324 1325 1326 1327 1328
	/*
	 * Drop (qos-)data::nullfunc frames silently, since they
	 * are used only to control station power saving mode.
	 */
	if (ieee80211_is_nullfunc(hdr->frame_control) ||
	    ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1329
		I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1330 1331 1332

		/*
		 * If we receive a 4-addr nullfunc frame from a STA
1333 1334 1335
		 * that was not moved to a 4-addr STA vlan yet send
		 * the event to userspace and for older hostapd drop
		 * the frame to the monitor interface.
1336 1337 1338 1339
		 */
		if (ieee80211_has_a4(hdr->frame_control) &&
		    (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
		     (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1340 1341 1342 1343 1344
		      !rx->sdata->u.vlan.sta))) {
			if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
				cfg80211_rx_unexpected_4addr_frame(
					rx->sdata->dev, sta->sta.addr,
					GFP_ATOMIC);
1345
			return RX_DROP_MONITOR;
1346
		}
1347 1348 1349 1350
		/*
		 * Update counter and free packet here to avoid
		 * counting this as a dropped packed.
		 */
1351 1352
		sta->rx_packets++;
		dev_kfree_skb(rx->skb);
1353
		return RX_QUEUED;
1354 1355
	}

1356
	return RX_CONTINUE;
1357 1358
} /* ieee80211_rx_h_sta_process */

1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
{
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	int keyidx;
	int hdrlen;
	ieee80211_rx_result result = RX_DROP_UNUSABLE;
	struct ieee80211_key *sta_ptk = NULL;
	int mmie_keyidx = -1;
	__le16 fc;

	/*
	 * Key selection 101
	 *
	 * There are four types of keys:
	 *  - GTK (group keys)
	 *  - IGTK (group keys for management frames)
	 *  - PTK (pairwise keys)
	 *  - STK (station-to-station pairwise keys)
	 *
	 * When selecting a key, we have to distinguish between multicast
	 * (including broadcast) and unicast frames, the latter can only
	 * use PTKs and STKs while the former always use GTKs and IGTKs.
	 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
	 * unicast frames can also use key indices like GTKs. Hence, if we
	 * don't have a PTK/STK we check the key index for a WEP key.
	 *
	 * Note that in a regular BSS, multicast frames are sent by the
	 * AP only, associated stations unicast the frame to the AP first
	 * which then multicasts it on their behalf.
	 *
	 * There is also a slight problem in IBSS mode: GTKs are negotiated
	 * with each station, that is something we don't currently handle.
	 * The spec seems to expect that one negotiates the same key with
	 * every station but there's no such requirement; VLANs could be
	 * possible.
	 */

	/*
	 * No point in finding a key and decrypting if the frame is neither
	 * addressed to us nor a multicast frame.
	 */
	if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
		return RX_CONTINUE;

	/* start without a key */
	rx->key = NULL;

	if (rx->sta)
		sta_ptk = rcu_dereference(rx->sta->ptk);

	fc = hdr->frame_control;

	if (!ieee80211_has_protected(fc))
		mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);

	if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
		rx->key = sta_ptk;
		if ((status->flag & RX_FLAG_DECRYPTED) &&
		    (status->flag & RX_FLAG_IV_STRIPPED))
			return RX_CONTINUE;
		/* Skip decryption if the frame is not protected. */
		if (!ieee80211_has_protected(fc))
			return RX_CONTINUE;
	} else if (mmie_keyidx >= 0) {
		/* Broadcast/multicast robust management frame / BIP */
		if ((status->flag & RX_FLAG_DECRYPTED) &&
		    (status->flag & RX_FLAG_IV_STRIPPED))
			return RX_CONTINUE;

		if (mmie_keyidx < NUM_DEFAULT_KEYS ||
		    mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
			return RX_DROP_MONITOR; /* unexpected BIP keyidx */
		if (rx->sta)
			rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
		if (!rx->key)
			rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
	} else if (!ieee80211_has_protected(fc)) {
		/*
		 * The frame was not protected, so skip decryption. However, we
		 * need to set rx->key if there is a key that could have been
		 * used so that the frame may be dropped if encryption would
		 * have been expected.
		 */
		struct ieee80211_key *key = NULL;
		struct ieee80211_sub_if_data *sdata = rx->sdata;
		int i;

		if (ieee80211_is_mgmt(fc) &&
		    is_multicast_ether_addr(hdr->addr1) &&
		    (key = rcu_dereference(rx->sdata->default_mgmt_key)))
			rx->key = key;
		else {
			if (rx->sta) {
				for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
					key = rcu_dereference(rx->sta->gtk[i]);
					if (key)
						break;
				}
			}
			if (!key) {
				for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
					key = rcu_dereference(sdata->keys[i]);
					if (key)
						break;
				}
			}
			if (key)
				rx->key = key;
		}
		return RX_CONTINUE;
	} else {
		u8 keyid;
		/*
		 * The device doesn't give us the IV so we won't be
		 * able to look up the key. That's ok though, we
		 * don't need to decrypt the frame, we just won't
		 * be able to keep statistics accurate.
		 * Except for key threshold notifications, should
		 * we somehow allow the driver to tell us which key
		 * the hardware used if this flag is set?
		 */
		if ((status->flag & RX_FLAG_DECRYPTED) &&
		    (status->flag & RX_FLAG_IV_STRIPPED))
			return RX_CONTINUE;

		hdrlen = ieee80211_hdrlen(fc);

		if (rx->skb->len < 8 + hdrlen)
			return RX_DROP_UNUSABLE; /* TODO: count this? */

		/*
		 * no need to call ieee80211_wep_get_keyidx,
		 * it verifies a bunch of things we've done already
		 */
		skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
		keyidx = keyid >> 6;

		/* check per-station GTK first, if multicast packet */
		if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
			rx->key = rcu_dereference(rx->sta->gtk[keyidx]);

		/* if not found, try default key */
		if (!rx->key) {
			rx->key = rcu_dereference(rx->sdata->keys[keyidx]);

			/*
			 * RSNA-protected unicast frames should always be
			 * sent with pairwise or station-to-station keys,
			 * but for WEP we allow using a key index as well.
			 */
			if (rx->key &&
			    rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
			    rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
			    !is_multicast_ether_addr(hdr->addr1))
				rx->key = NULL;
		}
	}

	if (rx->key) {
		if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
			return RX_DROP_MONITOR;

		rx->key->tx_rx_count++;
		/* TODO: add threshold stuff again */
	} else {
		return RX_DROP_MONITOR;
	}

	switch (rx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
		result = ieee80211_crypto_wep_decrypt(rx);
		break;
	case WLAN_CIPHER_SUITE_TKIP:
		result = ieee80211_crypto_tkip_decrypt(rx);
		break;
	case WLAN_CIPHER_SUITE_CCMP:
		result = ieee80211_crypto_ccmp_decrypt(rx);
		break;
	case WLAN_CIPHER_SUITE_AES_CMAC:
		result = ieee80211_crypto_aes_cmac_decrypt(rx);
		break;
	default:
		/*
		 * We can reach here only with HW-only algorithms
		 * but why didn't it decrypt the frame?!
		 */
		return RX_DROP_UNUSABLE;
	}

	/* the hdr variable is invalid after the decrypt handlers */

	/* either the frame has been decrypted or will be dropped */
	status->flag |= RX_FLAG_DECRYPTED;

	return result;
}

1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570
static inline struct ieee80211_fragment_entry *
ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
			 unsigned int frag, unsigned int seq, int rx_queue,
			 struct sk_buff **skb)
{
	struct ieee80211_fragment_entry *entry;

	entry = &sdata->fragments[sdata->fragment_next++];
	if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
		sdata->fragment_next = 0;

J
Johannes Berg 已提交
1571
	if (!skb_queue_empty(&entry->skb_list))
1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587
		__skb_queue_purge(&entry->skb_list);

	__skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
	*skb = NULL;
	entry->first_frag_time = jiffies;
	entry->seq = seq;
	entry->rx_queue = rx_queue;
	entry->last_frag = frag;
	entry->ccmp = 0;
	entry->extra_len = 0;

	return entry;
}

static inline struct ieee80211_fragment_entry *
ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1588
			  unsigned int frag, unsigned int seq,
1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607
			  int rx_queue, struct ieee80211_hdr *hdr)
{
	struct ieee80211_fragment_entry *entry;
	int i, idx;

	idx = sdata->fragment_next;
	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
		struct ieee80211_hdr *f_hdr;

		idx--;
		if (idx < 0)
			idx = IEEE80211_FRAGMENT_MAX - 1;

		entry = &sdata->fragments[idx];
		if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
		    entry->rx_queue != rx_queue ||
		    entry->last_frag + 1 != frag)
			continue;

1608
		f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1609

1610 1611 1612 1613 1614
		/*
		 * Check ftype and addresses are equal, else check next fragment
		 */
		if (((hdr->frame_control ^ f_hdr->frame_control) &
		     cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1615 1616
		    !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
		    !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1617 1618
			continue;

1619
		if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1620 1621 1622 1623 1624 1625 1626 1627 1628
			__skb_queue_purge(&entry->skb_list);
			continue;
		}
		return entry;
	}

	return NULL;
}

1629
static ieee80211_rx_result debug_noinline
1630
ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1631 1632 1633
{
	struct ieee80211_hdr *hdr;
	u16 sc;
1634
	__le16 fc;
1635 1636 1637
	unsigned int frag, seq;
	struct ieee80211_fragment_entry *entry;
	struct sk_buff *skb;
1638
	struct ieee80211_rx_status *status;
1639

1640
	hdr = (struct ieee80211_hdr *)rx->skb->data;
1641
	fc = hdr->frame_control;
1642 1643 1644 1645

	if (ieee80211_is_ctl(fc))
		return RX_CONTINUE;

1646 1647 1648
	sc = le16_to_cpu(hdr->seq_ctrl);
	frag = sc & IEEE80211_SCTL_FRAG;

1649
	if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1650 1651 1652 1653 1654 1655
		   is_multicast_ether_addr(hdr->addr1))) {
		/* not fragmented */
		goto out;
	}
	I802_DEBUG_INC(rx->local->rx_handlers_fragments);

Z
Zhu Yi 已提交
1656 1657 1658
	if (skb_linearize(rx->skb))
		return RX_DROP_UNUSABLE;

1659 1660 1661 1662 1663 1664
	/*
	 *  skb_linearize() might change the skb->data and
	 *  previously cached variables (in this case, hdr) need to
	 *  be refreshed with the new data.
	 */
	hdr = (struct ieee80211_hdr *)rx->skb->data;
1665 1666 1667 1668 1669
	seq = (sc & IEEE80211_SCTL_SEQ) >> 4;

	if (frag == 0) {
		/* This is the first fragment of a new frame. */
		entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1670
						 rx->seqno_idx, &(rx->skb));
1671
		if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1672
		    ieee80211_has_protected(fc)) {
1673
			int queue = rx->security_idx;
1674 1675 1676 1677
			/* Store CCMP PN so that we can verify that the next
			 * fragment has a sequential PN value. */
			entry->ccmp = 1;
			memcpy(entry->last_pn,
1678
			       rx->key->u.ccmp.rx_pn[queue],
1679
			       IEEE80211_CCMP_PN_LEN);
1680
		}
1681
		return RX_QUEUED;
1682 1683 1684 1685 1686
	}

	/* This is a fragment for a frame that should already be pending in
	 * fragment cache. Add this fragment to the end of the pending entry.
	 */
1687 1688
	entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
					  rx->seqno_idx, hdr);
1689 1690
	if (!entry) {
		I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
J
Johannes Berg 已提交
1691
		return RX_DROP_MONITOR;
1692 1693 1694 1695 1696 1697
	}

	/* Verify that MPDUs within one MSDU have sequential PN values.
	 * (IEEE 802.11i, 8.3.3.4.5) */
	if (entry->ccmp) {
		int i;
1698
		u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1699
		int queue;
1700
		if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
J
Johannes Berg 已提交
1701
			return RX_DROP_UNUSABLE;
1702 1703
		memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
		for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1704 1705 1706 1707
			pn[i]++;
			if (pn[i])
				break;
		}
1708
		queue = rx->security_idx;
1709
		rpn = rx->key->u.ccmp.rx_pn[queue];
1710
		if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
J
Johannes Berg 已提交
1711
			return RX_DROP_UNUSABLE;
1712
		memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1713 1714
	}

1715
	skb_pull(rx->skb, ieee80211_hdrlen(fc));
1716 1717 1718
	__skb_queue_tail(&entry->skb_list, rx->skb);
	entry->last_frag = frag;
	entry->extra_len += rx->skb->len;
1719
	if (ieee80211_has_morefrags(fc)) {
1720
		rx->skb = NULL;
1721
		return RX_QUEUED;
1722 1723 1724 1725 1726 1727 1728 1729 1730
	}

	rx->skb = __skb_dequeue(&entry->skb_list);
	if (skb_tailroom(rx->skb) < entry->extra_len) {
		I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
		if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
					      GFP_ATOMIC))) {
			I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
			__skb_queue_purge(&entry->skb_list);
J
Johannes Berg 已提交
1731
			return RX_DROP_UNUSABLE;
1732 1733 1734 1735 1736 1737 1738 1739
		}
	}
	while ((skb = __skb_dequeue(&entry->skb_list))) {
		memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
		dev_kfree_skb(skb);
	}

	/* Complete frame has been reassembled - process it now */
1740 1741
	status = IEEE80211_SKB_RXCB(rx->skb);
	status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1742 1743 1744 1745 1746 1747 1748 1749

 out:
	if (rx->sta)
		rx->sta->rx_packets++;
	if (is_multicast_ether_addr(hdr->addr1))
		rx->local->dot11MulticastReceivedFrameCount++;
	else
		ieee80211_led_rx(rx->local);
1750
	return RX_CONTINUE;
1751 1752
}

J
Johannes Berg 已提交
1753
static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1754
{
J
Johannes Berg 已提交
1755
	if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1756
		return -EACCES;
1757

1758
	return 0;
1759 1760
}

J
Johannes Berg 已提交
1761
static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1762
{
J
Johannes Berg 已提交
1763 1764 1765
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);

1766
	/*
1767 1768
	 * Pass through unencrypted frames if the hardware has
	 * decrypted them already.
1769
	 */
J
Johannes Berg 已提交
1770
	if (status->flag & RX_FLAG_DECRYPTED)
1771
		return 0;
1772 1773

	/* Drop unencrypted frames if key is set. */
1774 1775
	if (unlikely(!ieee80211_has_protected(fc) &&
		     !ieee80211_is_nullfunc(fc) &&
1776
		     ieee80211_is_data(fc) &&
1777
		     (rx->key || rx->sdata->drop_unencrypted)))
1778
		return -EACCES;
1779 1780 1781 1782

	return 0;
}

J
Johannes Berg 已提交
1783
static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1784 1785
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1786
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1787 1788
	__le16 fc = hdr->frame_control;

1789 1790 1791 1792 1793 1794
	/*
	 * Pass through unencrypted frames if the hardware has
	 * decrypted them already.
	 */
	if (status->flag & RX_FLAG_DECRYPTED)
		return 0;
1795

J
Johannes Berg 已提交
1796
	if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1797 1798
		if (unlikely(!ieee80211_has_protected(fc) &&
			     ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1799
			     rx->key)) {
1800 1801 1802 1803 1804
			if (ieee80211_is_deauth(fc) ||
			    ieee80211_is_disassoc(fc))
				cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
							     rx->skb->data,
							     rx->skb->len);
1805
			return -EACCES;
1806
		}
1807
		/* BIP does not use Protected field, so need to check MMIE */
1808
		if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1809
			     ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1810 1811 1812 1813 1814
			if (ieee80211_is_deauth(fc) ||
			    ieee80211_is_disassoc(fc))
				cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
							     rx->skb->data,
							     rx->skb->len);
1815
			return -EACCES;
1816
		}
1817 1818 1819 1820 1821 1822 1823 1824 1825
		/*
		 * When using MFP, Action frames are not allowed prior to
		 * having configured keys.
		 */
		if (unlikely(ieee80211_is_action(fc) && !rx->key &&
			     ieee80211_is_robust_mgmt_frame(
				     (struct ieee80211_hdr *) rx->skb->data)))
			return -EACCES;
	}
1826

1827
	return 0;
1828 1829
}

1830
static int
1831
__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1832
{
J
Johannes Berg 已提交
1833
	struct ieee80211_sub_if_data *sdata = rx->sdata;
1834
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1835 1836 1837
	bool check_port_control = false;
	struct ethhdr *ehdr;
	int ret;
1838

1839
	*port_control = false;
1840 1841
	if (ieee80211_has_a4(hdr->frame_control) &&
	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1842
		return -1;
1843

1844 1845 1846 1847 1848 1849 1850 1851 1852
	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
	    !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {

		if (!sdata->u.mgd.use_4addr)
			return -1;
		else
			check_port_control = true;
	}

1853
	if (is_multicast_ether_addr(hdr->addr1) &&
1854
	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1855
		return -1;
1856

1857
	ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1858
	if (ret < 0)
1859 1860 1861
		return ret;

	ehdr = (struct ethhdr *) rx->skb->data;
1862 1863 1864
	if (ehdr->h_proto == rx->sdata->control_port_protocol)
		*port_control = true;
	else if (check_port_control)
1865 1866 1867
		return -1;

	return 0;
1868
}
1869

1870 1871 1872
/*
 * requires that rx->skb is a frame with ethernet header
 */
1873
static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1874
{
1875
	static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1876 1877 1878 1879 1880 1881 1882
		= { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
	struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;

	/*
	 * Allow EAPOL frames to us/the PAE group address regardless
	 * of whether the frame was encrypted or not.
	 */
1883
	if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1884 1885
	    (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
	     ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1886 1887 1888
		return true;

	if (ieee80211_802_1x_port_control(rx) ||
1889
	    ieee80211_drop_unencrypted(rx, fc))
1890 1891 1892 1893 1894 1895 1896 1897
		return false;

	return true;
}

/*
 * requires that rx->skb is a frame with ethernet header
 */
1898
static void
1899
ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1900
{
J
Johannes Berg 已提交
1901 1902
	struct ieee80211_sub_if_data *sdata = rx->sdata;
	struct net_device *dev = sdata->dev;
1903
	struct sk_buff *skb, *xmit_skb;
1904 1905
	struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
	struct sta_info *dsta;
1906
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1907

1908 1909
	skb = rx->skb;
	xmit_skb = NULL;
1910

1911 1912
	if ((sdata->vif.type == NL80211_IFTYPE_AP ||
	     sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1913
	    !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1914
	    (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1915
	    (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1916 1917 1918 1919 1920
		if (is_multicast_ether_addr(ehdr->h_dest)) {
			/*
			 * send multicast frames both to higher layers in
			 * local net stack and back to the wireless medium
			 */
1921
			xmit_skb = skb_copy(skb, GFP_ATOMIC);
1922
			if (!xmit_skb)
J
Johannes Berg 已提交
1923
				net_info_ratelimited("%s: failed to clone multicast frame\n",
1924
						    dev->name);
1925
		} else {
1926 1927
			dsta = sta_info_get(sdata, skb->data);
			if (dsta) {
1928 1929 1930 1931 1932
				/*
				 * The destination station is associated to
				 * this AP (in this VLAN), so send the frame
				 * directly to it and do not pass it to local
				 * net stack.
1933
				 */
1934
				xmit_skb = skb;
1935 1936 1937 1938 1939 1940
				skb = NULL;
			}
		}
	}

	if (skb) {
1941 1942
		int align __maybe_unused;

1943
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1944 1945 1946 1947
		/*
		 * 'align' will only take the values 0 or 2 here
		 * since all frames are required to be aligned
		 * to 2-byte boundaries when being passed to
1948 1949 1950 1951
		 * mac80211; the code here works just as well if
		 * that isn't true, but mac80211 assumes it can
		 * access fields as 2-byte aligned (e.g. for
		 * compare_ether_addr)
1952
		 */
1953
		align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1954 1955 1956 1957 1958 1959
		if (align) {
			if (WARN_ON(skb_headroom(skb) < 3)) {
				dev_kfree_skb(skb);
				skb = NULL;
			} else {
				u8 *data = skb->data;
1960 1961 1962 1963
				size_t len = skb_headlen(skb);
				skb->data -= align;
				memmove(skb->data, data, len);
				skb_set_tail_pointer(skb, len);
1964 1965 1966 1967 1968 1969 1970 1971
			}
		}
#endif

		if (skb) {
			/* deliver to local stack */
			skb->protocol = eth_type_trans(skb, dev);
			memset(skb->cb, 0, sizeof(skb->cb));
1972
			netif_receive_skb(skb);
1973
		}
1974 1975
	}

1976
	if (xmit_skb) {
1977 1978 1979 1980 1981 1982
		/*
		 * Send to wireless media and increase priority by 256 to
		 * keep the received priority instead of reclassifying
		 * the frame (see cfg80211_classify8021d).
		 */
		xmit_skb->priority += 256;
1983
		xmit_skb->protocol = htons(ETH_P_802_3);
1984 1985
		skb_reset_network_header(xmit_skb);
		skb_reset_mac_header(xmit_skb);
1986
		dev_queue_xmit(xmit_skb);
1987
	}
1988 1989
}

1990
static ieee80211_rx_result debug_noinline
1991
ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1992
{
J
Johannes Berg 已提交
1993
	struct net_device *dev = rx->sdata->dev;
Z
Zhu Yi 已提交
1994
	struct sk_buff *skb = rx->skb;
1995 1996
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	__le16 fc = hdr->frame_control;
Z
Zhu Yi 已提交
1997
	struct sk_buff_head frame_list;
1998
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1999

2000
	if (unlikely(!ieee80211_is_data(fc)))
2001
		return RX_CONTINUE;
2002

2003
	if (unlikely(!ieee80211_is_data_present(fc)))
J
Johannes Berg 已提交
2004
		return RX_DROP_MONITOR;
2005

2006
	if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2007
		return RX_CONTINUE;
2008

Z
Zhu Yi 已提交
2009 2010 2011
	if (ieee80211_has_a4(hdr->frame_control) &&
	    rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
	    !rx->sdata->u.vlan.sta)
J
Johannes Berg 已提交
2012
		return RX_DROP_UNUSABLE;
2013

Z
Zhu Yi 已提交
2014 2015 2016 2017 2018
	if (is_multicast_ether_addr(hdr->addr1) &&
	    ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
	      rx->sdata->u.vlan.sta) ||
	     (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
	      rx->sdata->u.mgd.use_4addr)))
J
Johannes Berg 已提交
2019
		return RX_DROP_UNUSABLE;
2020

Z
Zhu Yi 已提交
2021 2022
	skb->dev = dev;
	__skb_queue_head_init(&frame_list);
2023

Z
Zhu Yi 已提交
2024 2025 2026
	if (skb_linearize(skb))
		return RX_DROP_UNUSABLE;

Z
Zhu Yi 已提交
2027 2028
	ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
				 rx->sdata->vif.type,
2029
				 rx->local->hw.extra_tx_headroom, true);
2030

Z
Zhu Yi 已提交
2031 2032
	while (!skb_queue_empty(&frame_list)) {
		rx->skb = __skb_dequeue(&frame_list);
2033

2034
		if (!ieee80211_frame_allowed(rx, fc)) {
Z
Zhu Yi 已提交
2035
			dev_kfree_skb(rx->skb);
2036 2037
			continue;
		}
Z
Zhu Yi 已提交
2038 2039
		dev->stats.rx_packets++;
		dev->stats.rx_bytes += rx->skb->len;
2040 2041 2042 2043

		ieee80211_deliver_skb(rx);
	}

2044
	return RX_QUEUED;
2045 2046
}

I
Ingo Molnar 已提交
2047
#ifdef CONFIG_MAC80211_MESH
2048
static ieee80211_rx_result
2049 2050
ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
{
2051 2052
	struct ieee80211_hdr *fwd_hdr, *hdr;
	struct ieee80211_tx_info *info;
2053 2054
	struct ieee80211s_hdr *mesh_hdr;
	struct sk_buff *skb = rx->skb, *fwd_skb;
J
Johannes Berg 已提交
2055
	struct ieee80211_local *local = rx->local;
J
Johannes Berg 已提交
2056
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2057
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2058
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2059
	__le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
2060
	u16 q, hdrlen;
2061 2062 2063

	hdr = (struct ieee80211_hdr *) skb->data;
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077

	/* make sure fixed part of mesh header is there, also checks skb len */
	if (!pskb_may_pull(rx->skb, hdrlen + 6))
		return RX_DROP_MONITOR;

	mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);

	/* make sure full mesh header is there, also checks skb len */
	if (!pskb_may_pull(rx->skb,
			   hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
		return RX_DROP_MONITOR;

	/* reload pointers */
	hdr = (struct ieee80211_hdr *) skb->data;
2078 2079
	mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);

2080 2081 2082
	/* frame is in RMC, don't forward */
	if (ieee80211_is_data(hdr->frame_control) &&
	    is_multicast_ether_addr(hdr->addr1) &&
J
Johannes Berg 已提交
2083
	    mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2084 2085
		return RX_DROP_MONITOR;

2086 2087
	if (!ieee80211_is_data(hdr->frame_control) ||
	    !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2088 2089 2090 2091 2092
		return RX_CONTINUE;

	if (!mesh_hdr->ttl)
		return RX_DROP_MONITOR;

2093
	if (mesh_hdr->flags & MESH_FLAGS_AE) {
2094
		struct mesh_path *mppath;
2095 2096 2097 2098 2099 2100
		char *proxied_addr;
		char *mpp_addr;

		if (is_multicast_ether_addr(hdr->addr1)) {
			mpp_addr = hdr->addr3;
			proxied_addr = mesh_hdr->eaddr1;
2101 2102
		} else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
			/* has_a4 already checked in ieee80211_rx_mesh_check */
2103 2104
			mpp_addr = hdr->addr4;
			proxied_addr = mesh_hdr->eaddr2;
2105 2106
		} else {
			return RX_DROP_MONITOR;
2107
		}
2108 2109

		rcu_read_lock();
J
Johannes Berg 已提交
2110
		mppath = mpp_path_lookup(sdata, proxied_addr);
2111
		if (!mppath) {
J
Johannes Berg 已提交
2112
			mpp_path_add(sdata, proxied_addr, mpp_addr);
2113 2114
		} else {
			spin_lock_bh(&mppath->state_lock);
2115
			if (!ether_addr_equal(mppath->mpp, mpp_addr))
2116
				memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2117 2118 2119 2120 2121
			spin_unlock_bh(&mppath->state_lock);
		}
		rcu_read_unlock();
	}

2122 2123
	/* Frame has reached destination.  Don't forward */
	if (!is_multicast_ether_addr(hdr->addr1) &&
2124
	    ether_addr_equal(sdata->vif.addr, hdr->addr3))
2125 2126
		return RX_CONTINUE;

Y
Yoni Divinsky 已提交
2127
	q = ieee80211_select_queue_80211(sdata, skb, hdr);
2128
	if (ieee80211_queue_stopped(&local->hw, q)) {
2129
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2130 2131 2132
		return RX_DROP_MONITOR;
	}
	skb_set_queue_mapping(skb, q);
2133

2134 2135
	if (!--mesh_hdr->ttl) {
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2136
		goto out;
2137 2138
	}

2139 2140 2141
	if (!ifmsh->mshcfg.dot11MeshForwarding)
		goto out;

2142 2143
	fwd_skb = skb_copy(skb, GFP_ATOMIC);
	if (!fwd_skb) {
J
Johannes Berg 已提交
2144
		net_info_ratelimited("%s: failed to clone mesh frame\n",
2145
				    sdata->name);
2146 2147 2148 2149
		goto out;
	}

	fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2150
	fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2151 2152 2153 2154 2155 2156 2157 2158
	info = IEEE80211_SKB_CB(fwd_skb);
	memset(info, 0, sizeof(*info));
	info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
	info->control.vif = &rx->sdata->vif;
	info->control.jiffies = jiffies;
	if (is_multicast_ether_addr(fwd_hdr->addr1)) {
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
		memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
M
Marco Porsch 已提交
2159 2160
		/* update power mode indication when forwarding */
		ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
J
Johannes Berg 已提交
2161
	} else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
M
Marco Porsch 已提交
2162
		/* mesh power mode flags updated in mesh_nexthop_lookup */
2163 2164 2165
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
	} else {
		/* unable to resolve next hop */
J
Johannes Berg 已提交
2166 2167
		mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
				   fwd_hdr->addr3, 0, reason, fwd_hdr->addr2);
2168
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2169
		kfree_skb(fwd_skb);
2170
		return RX_DROP_MONITOR;
2171 2172
	}

2173 2174
	IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
	ieee80211_add_pending_skb(local, fwd_skb);
J
Johannes Berg 已提交
2175
 out:
2176
	if (is_multicast_ether_addr(hdr->addr1) ||
J
Johannes Berg 已提交
2177
	    sdata->dev->flags & IFF_PROMISC)
2178 2179 2180 2181
		return RX_CONTINUE;
	else
		return RX_DROP_MONITOR;
}
I
Ingo Molnar 已提交
2182
#endif
2183

2184
static ieee80211_rx_result debug_noinline
2185
ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2186
{
J
Johannes Berg 已提交
2187
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2188
	struct ieee80211_local *local = rx->local;
J
Johannes Berg 已提交
2189
	struct net_device *dev = sdata->dev;
2190 2191
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
	__le16 fc = hdr->frame_control;
2192
	bool port_control;
2193
	int err;
2194

2195
	if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2196
		return RX_CONTINUE;
2197

2198
	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
J
Johannes Berg 已提交
2199
		return RX_DROP_MONITOR;
2200

2201
	/*
2202 2203
	 * Send unexpected-4addr-frame event to hostapd. For older versions,
	 * also drop the frame to cooked monitor interfaces.
2204 2205
	 */
	if (ieee80211_has_a4(hdr->frame_control) &&
2206 2207 2208 2209 2210
	    sdata->vif.type == NL80211_IFTYPE_AP) {
		if (rx->sta &&
		    !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
			cfg80211_rx_unexpected_4addr_frame(
				rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2211
		return RX_DROP_MONITOR;
2212
	}
2213

2214
	err = __ieee80211_data_to_8023(rx, &port_control);
2215
	if (unlikely(err))
J
Johannes Berg 已提交
2216
		return RX_DROP_UNUSABLE;
2217

2218
	if (!ieee80211_frame_allowed(rx, fc))
J
Johannes Berg 已提交
2219
		return RX_DROP_MONITOR;
2220

2221 2222 2223 2224 2225 2226 2227 2228
	if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
	    unlikely(port_control) && sdata->bss) {
		sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
				     u.ap);
		dev = sdata->dev;
		rx->sdata = sdata;
	}

2229 2230 2231 2232 2233
	rx->skb->dev = dev;

	dev->stats.rx_packets++;
	dev->stats.rx_bytes += rx->skb->len;

2234
	if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2235 2236 2237 2238
	    !is_multicast_ether_addr(
		    ((struct ethhdr *)rx->skb->data)->h_dest) &&
	    (!local->scanning &&
	     !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2239 2240 2241 2242
			mod_timer(&local->dynamic_ps_timer, jiffies +
			 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
	}

2243
	ieee80211_deliver_skb(rx);
2244

2245
	return RX_QUEUED;
2246 2247
}

2248
static ieee80211_rx_result debug_noinline
2249
ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2250 2251
{
	struct sk_buff *skb = rx->skb;
2252
	struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2253 2254 2255 2256
	struct tid_ampdu_rx *tid_agg_rx;
	u16 start_seq_num;
	u16 tid;

2257
	if (likely(!ieee80211_is_ctl(bar->frame_control)))
2258
		return RX_CONTINUE;
2259

2260
	if (ieee80211_is_back_req(bar->frame_control)) {
2261 2262 2263 2264
		struct {
			__le16 control, start_seq_num;
		} __packed bar_data;

2265
		if (!rx->sta)
2266
			return RX_DROP_MONITOR;
2267 2268 2269 2270 2271 2272

		if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
				  &bar_data, sizeof(bar_data)))
			return RX_DROP_MONITOR;

		tid = le16_to_cpu(bar_data.control) >> 12;
2273 2274 2275

		tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
		if (!tid_agg_rx)
2276
			return RX_DROP_MONITOR;
2277

2278
		start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2279 2280

		/* reset session timer */
2281 2282 2283
		if (tid_agg_rx->timeout)
			mod_timer(&tid_agg_rx->session_timer,
				  TU_TO_EXP_TIME(tid_agg_rx->timeout));
2284

2285
		spin_lock(&tid_agg_rx->reorder_lock);
2286
		/* release stored frames up to start of BAR */
2287
		ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2288
						 start_seq_num, frames);
2289 2290
		spin_unlock(&tid_agg_rx->reorder_lock);

2291 2292
		kfree_skb(skb);
		return RX_QUEUED;
2293 2294
	}

2295 2296 2297 2298 2299 2300
	/*
	 * After this point, we only want management frames,
	 * so we can drop all remaining control frames to
	 * cooked monitor interfaces.
	 */
	return RX_DROP_MONITOR;
2301 2302
}

2303 2304 2305
static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
					   struct ieee80211_mgmt *mgmt,
					   size_t len)
2306 2307 2308 2309 2310
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *resp;

2311
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2312 2313 2314 2315
		/* Not to own unicast address */
		return;
	}

2316 2317
	if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
	    !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2318
		/* Not from the current AP or not associated yet. */
2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334
		return;
	}

	if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
		/* Too short SA Query request frame */
		return;
	}

	skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
	if (skb == NULL)
		return;

	skb_reserve(skb, local->hw.extra_tx_headroom);
	resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(resp, 0, 24);
	memcpy(resp->da, mgmt->sa, ETH_ALEN);
2335
	memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2336
	memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2337 2338 2339 2340 2341 2342 2343 2344 2345
	resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_ACTION);
	skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
	resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
	resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
	memcpy(resp->u.action.u.sa_query.trans_id,
	       mgmt->u.action.u.sa_query.trans_id,
	       WLAN_SA_QUERY_TR_ID_LEN);

2346
	ieee80211_tx_skb(sdata, skb);
2347 2348
}

2349 2350 2351 2352
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
{
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2353
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365

	/*
	 * From here on, look only at management frames.
	 * Data and control frames are already handled,
	 * and unknown (reserved) frames are useless.
	 */
	if (rx->skb->len < 24)
		return RX_DROP_MONITOR;

	if (!ieee80211_is_mgmt(mgmt->frame_control))
		return RX_DROP_MONITOR;

J
Johannes Berg 已提交
2366 2367 2368
	if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
	    ieee80211_is_beacon(mgmt->frame_control) &&
	    !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2369 2370 2371 2372 2373
		int sig = 0;

		if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
			sig = status->signal;

J
Johannes Berg 已提交
2374 2375
		cfg80211_report_obss_beacon(rx->local->hw.wiphy,
					    rx->skb->data, rx->skb->len,
2376
					    status->freq, sig);
J
Johannes Berg 已提交
2377 2378 2379
		rx->flags |= IEEE80211_RX_BEACON_REPORTED;
	}

2380
	if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2381 2382 2383 2384 2385 2386 2387 2388
		return RX_DROP_MONITOR;

	if (ieee80211_drop_unencrypted_mgmt(rx))
		return RX_DROP_UNUSABLE;

	return RX_CONTINUE;
}

2389 2390 2391 2392
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
{
	struct ieee80211_local *local = rx->local;
J
Johannes Berg 已提交
2393
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2394
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2395
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2396 2397 2398 2399 2400
	int len = rx->skb->len;

	if (!ieee80211_is_action(mgmt->frame_control))
		return RX_CONTINUE;

2401 2402
	/* drop too small frames */
	if (len < IEEE80211_MIN_ACTION_SIZE)
2403
		return RX_DROP_UNUSABLE;
2404

2405
	if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2406 2407
	    mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
	    mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2408
		return RX_DROP_UNUSABLE;
2409

2410
	if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2411
		return RX_DROP_UNUSABLE;
2412

2413
	switch (mgmt->u.action.category) {
2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425
	case WLAN_CATEGORY_HT:
		/* reject HT action frames from stations not supporting HT */
		if (!rx->sta->sta.ht_cap.ht_supported)
			goto invalid;

		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
		    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
		    sdata->vif.type != NL80211_IFTYPE_AP &&
		    sdata->vif.type != NL80211_IFTYPE_ADHOC)
			break;

2426
		/* verify action & smps_control/chanwidth are present */
2427 2428 2429 2430 2431 2432
		if (len < IEEE80211_MIN_ACTION_SIZE + 2)
			goto invalid;

		switch (mgmt->u.action.u.ht_smps.action) {
		case WLAN_HT_ACTION_SMPS: {
			struct ieee80211_supported_band *sband;
2433
			enum ieee80211_smps_mode smps_mode;
2434 2435 2436 2437

			/* convert to HT capability */
			switch (mgmt->u.action.u.ht_smps.smps_control) {
			case WLAN_HT_SMPS_CONTROL_DISABLED:
2438
				smps_mode = IEEE80211_SMPS_OFF;
2439 2440
				break;
			case WLAN_HT_SMPS_CONTROL_STATIC:
2441
				smps_mode = IEEE80211_SMPS_STATIC;
2442 2443
				break;
			case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2444
				smps_mode = IEEE80211_SMPS_DYNAMIC;
2445 2446 2447 2448 2449 2450
				break;
			default:
				goto invalid;
			}

			/* if no change do nothing */
2451
			if (rx->sta->sta.smps_mode == smps_mode)
2452
				goto handled;
2453
			rx->sta->sta.smps_mode = smps_mode;
2454 2455 2456

			sband = rx->local->hw.wiphy->bands[status->band];

2457 2458
			rate_control_rate_update(local, sband, rx->sta,
						 IEEE80211_RC_SMPS_CHANGED);
2459 2460
			goto handled;
		}
2461 2462 2463
		case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
			struct ieee80211_supported_band *sband;
			u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2464
			enum ieee80211_sta_rx_bandwidth new_bw;
2465 2466

			/* If it doesn't support 40 MHz it can't change ... */
2467 2468
			if (!(rx->sta->sta.ht_cap.cap &
					IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2469 2470
				goto handled;

2471 2472 2473 2474
			if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
				new_bw = IEEE80211_STA_RX_BW_20;
			else
				new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2475

2476
			if (rx->sta->sta.bandwidth == new_bw)
2477 2478 2479 2480 2481 2482 2483 2484
				goto handled;

			sband = rx->local->hw.wiphy->bands[status->band];

			rate_control_rate_update(local, sband, rx->sta,
						 IEEE80211_RC_BW_CHANGED);
			goto handled;
		}
2485 2486 2487 2488
		default:
			goto invalid;
		}

2489
		break;
2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505
	case WLAN_CATEGORY_PUBLIC:
		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
			goto invalid;
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			break;
		if (!rx->sta)
			break;
		if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
			break;
		if (mgmt->u.action.u.ext_chan_switch.action_code !=
				WLAN_PUB_ACTION_EXT_CHANSW_ANN)
			break;
		if (len < offsetof(struct ieee80211_mgmt,
				   u.action.u.ext_chan_switch.variable))
			goto invalid;
		goto queue;
2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528
	case WLAN_CATEGORY_VHT:
		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
		    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
		    sdata->vif.type != NL80211_IFTYPE_AP &&
		    sdata->vif.type != NL80211_IFTYPE_ADHOC)
			break;

		/* verify action code is present */
		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
			goto invalid;

		switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
		case WLAN_VHT_ACTION_OPMODE_NOTIF: {
			u8 opmode;

			/* verify opmode is present */
			if (len < IEEE80211_MIN_ACTION_SIZE + 2)
				goto invalid;

			opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;

			ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2529 2530
						    opmode, status->band,
						    false);
2531 2532 2533 2534 2535
			goto handled;
		}
		default:
			break;
		}
2536
		break;
2537
	case WLAN_CATEGORY_BACK:
2538
		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2539
		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2540
		    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2541 2542
		    sdata->vif.type != NL80211_IFTYPE_AP &&
		    sdata->vif.type != NL80211_IFTYPE_ADHOC)
2543
			break;
2544

2545 2546 2547 2548
		/* verify action_code is present */
		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
			break;

2549 2550 2551 2552
		switch (mgmt->u.action.u.addba_req.action_code) {
		case WLAN_ACTION_ADDBA_REQ:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.addba_req)))
2553 2554
				goto invalid;
			break;
2555 2556 2557
		case WLAN_ACTION_ADDBA_RESP:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.addba_resp)))
2558 2559
				goto invalid;
			break;
2560 2561 2562
		case WLAN_ACTION_DELBA:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.delba)))
2563 2564 2565 2566
				goto invalid;
			break;
		default:
			goto invalid;
2567
		}
2568

2569
		goto queue;
2570
	case WLAN_CATEGORY_SPECTRUM_MGMT:
2571 2572 2573 2574
		/* verify action_code is present */
		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
			break;

2575 2576
		switch (mgmt->u.action.u.measurement.action_code) {
		case WLAN_ACTION_SPCT_MSR_REQ:
2577 2578 2579
			if (status->band != IEEE80211_BAND_5GHZ)
				break;

2580 2581
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.measurement)))
2582
				break;
2583 2584 2585 2586

			if (sdata->vif.type != NL80211_IFTYPE_STATION)
				break;

2587
			ieee80211_process_measurement_req(sdata, mgmt, len);
2588
			goto handled;
2589 2590 2591 2592
		case WLAN_ACTION_SPCT_CHL_SWITCH: {
			u8 *bssid;
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.chan_switch)))
2593
				break;
2594

2595
			if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2596 2597
			    sdata->vif.type != NL80211_IFTYPE_ADHOC &&
			    sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2598 2599 2600 2601 2602 2603
				break;

			if (sdata->vif.type == NL80211_IFTYPE_STATION)
				bssid = sdata->u.mgd.bssid;
			else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
				bssid = sdata->u.ibss.bssid;
2604 2605
			else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
				bssid = mgmt->sa;
2606 2607 2608 2609
			else
				break;

			if (!ether_addr_equal(mgmt->bssid, bssid))
2610
				break;
S
Sujith 已提交
2611

2612
			goto queue;
2613
			}
2614 2615
		}
		break;
2616 2617 2618
	case WLAN_CATEGORY_SA_QUERY:
		if (len < (IEEE80211_MIN_ACTION_SIZE +
			   sizeof(mgmt->u.action.u.sa_query)))
2619 2620
			break;

2621 2622 2623
		switch (mgmt->u.action.u.sa_query.action) {
		case WLAN_ACTION_SA_QUERY_REQUEST:
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
2624
				break;
2625
			ieee80211_process_sa_query_req(sdata, mgmt, len);
2626
			goto handled;
2627 2628
		}
		break;
2629
	case WLAN_CATEGORY_SELF_PROTECTED:
2630 2631 2632 2633
		if (len < (IEEE80211_MIN_ACTION_SIZE +
			   sizeof(mgmt->u.action.u.self_prot.action_code)))
			break;

2634 2635 2636 2637 2638 2639
		switch (mgmt->u.action.u.self_prot.action_code) {
		case WLAN_SP_MESH_PEERING_OPEN:
		case WLAN_SP_MESH_PEERING_CLOSE:
		case WLAN_SP_MESH_PEERING_CONFIRM:
			if (!ieee80211_vif_is_mesh(&sdata->vif))
				goto invalid;
2640
			if (sdata->u.mesh.user_mpm)
2641 2642 2643 2644 2645 2646 2647 2648 2649 2650
				/* userspace handles this frame */
				break;
			goto queue;
		case WLAN_SP_MGK_INFORM:
		case WLAN_SP_MGK_ACK:
			if (!ieee80211_vif_is_mesh(&sdata->vif))
				goto invalid;
			break;
		}
		break;
2651
	case WLAN_CATEGORY_MESH_ACTION:
2652 2653 2654 2655
		if (len < (IEEE80211_MIN_ACTION_SIZE +
			   sizeof(mgmt->u.action.u.mesh_action.action_code)))
			break;

2656 2657
		if (!ieee80211_vif_is_mesh(&sdata->vif))
			break;
2658
		if (mesh_action_is_path_sel(mgmt) &&
J
Johannes Berg 已提交
2659
		    !mesh_path_sel_is_hwmp(sdata))
2660 2661
			break;
		goto queue;
2662
	}
2663

2664 2665
	return RX_CONTINUE;

2666
 invalid:
2667
	status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688
	/* will return in the next handlers */
	return RX_CONTINUE;

 handled:
	if (rx->sta)
		rx->sta->rx_packets++;
	dev_kfree_skb(rx->skb);
	return RX_QUEUED;

 queue:
	rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
	skb_queue_tail(&sdata->skb_queue, rx->skb);
	ieee80211_queue_work(&local->hw, &sdata->work);
	if (rx->sta)
		rx->sta->rx_packets++;
	return RX_QUEUED;
}

static ieee80211_rx_result debug_noinline
ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
{
2689
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2690
	int sig = 0;
2691 2692

	/* skip known-bad action frames and return them in the next handler */
2693
	if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2694
		return RX_CONTINUE;
2695

2696 2697 2698 2699 2700 2701 2702
	/*
	 * Getting here means the kernel doesn't know how to handle
	 * it, but maybe userspace does ... include returned frames
	 * so userspace can register for those to know whether ones
	 * it transmitted were processed or returned.
	 */

2703 2704 2705
	if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
		sig = status->signal;

2706
	if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2707
			     rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723
		if (rx->sta)
			rx->sta->rx_packets++;
		dev_kfree_skb(rx->skb);
		return RX_QUEUED;
	}

	return RX_CONTINUE;
}

static ieee80211_rx_result debug_noinline
ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
{
	struct ieee80211_local *local = rx->local;
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
	struct sk_buff *nskb;
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2724
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2725 2726 2727 2728 2729 2730 2731 2732 2733

	if (!ieee80211_is_action(mgmt->frame_control))
		return RX_CONTINUE;

	/*
	 * For AP mode, hostapd is responsible for handling any action
	 * frames that we didn't handle, including returning unknown
	 * ones. For all other modes we will return them to the sender,
	 * setting the 0x80 bit in the action category, as required by
2734
	 * 802.11-2012 9.24.4.
2735 2736 2737 2738
	 * Newer versions of hostapd shall also use the management frame
	 * registration mechanisms, but older ones still use cooked
	 * monitor interfaces so push all frames there.
	 */
2739
	if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2740 2741 2742
	    (sdata->vif.type == NL80211_IFTYPE_AP ||
	     sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
		return RX_DROP_MONITOR;
2743

2744 2745 2746
	if (is_multicast_ether_addr(mgmt->da))
		return RX_DROP_MONITOR;

2747 2748 2749 2750 2751 2752 2753
	/* do not return rejected action frames */
	if (mgmt->u.action.category & 0x80)
		return RX_DROP_UNUSABLE;

	nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
			       GFP_ATOMIC);
	if (nskb) {
2754
		struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2755

2756 2757 2758
		nmgmt->u.action.category |= 0x80;
		memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
		memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2759 2760 2761

		memset(nskb->cb, 0, sizeof(nskb->cb));

2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774
		if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);

			info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
				      IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
				      IEEE80211_TX_CTL_NO_CCK_RATE;
			if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
				info->hw_queue =
					local->hw.offchannel_tx_hw_queue;
		}

		__ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
					    status->band);
2775
	}
2776 2777
	dev_kfree_skb(rx->skb);
	return RX_QUEUED;
2778 2779
}

2780
static ieee80211_rx_result debug_noinline
2781
ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2782
{
J
Johannes Berg 已提交
2783
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2784 2785
	struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
	__le16 stype;
2786

2787
	stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2788

2789 2790 2791 2792
	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
	    sdata->vif.type != NL80211_IFTYPE_ADHOC &&
	    sdata->vif.type != NL80211_IFTYPE_STATION)
		return RX_DROP_MONITOR;
2793

2794
	switch (stype) {
J
Johannes Berg 已提交
2795
	case cpu_to_le16(IEEE80211_STYPE_AUTH):
2796 2797 2798 2799
	case cpu_to_le16(IEEE80211_STYPE_BEACON):
	case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
		/* process for all: mesh, mlme, ibss */
		break;
J
Johannes Berg 已提交
2800 2801
	case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
	case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2802 2803
	case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
	case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2804 2805 2806 2807
		if (is_multicast_ether_addr(mgmt->da) &&
		    !is_broadcast_ether_addr(mgmt->da))
			return RX_DROP_MONITOR;

2808 2809 2810 2811 2812
		/* process only for station */
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			return RX_DROP_MONITOR;
		break;
	case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2813 2814 2815
		/* process only for ibss and mesh */
		if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2816 2817 2818 2819 2820
			return RX_DROP_MONITOR;
		break;
	default:
		return RX_DROP_MONITOR;
	}
2821

2822
	/* queue up frame and kick off work to process it */
2823
	rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2824 2825
	skb_queue_tail(&sdata->skb_queue, rx->skb);
	ieee80211_queue_work(&rx->local->hw, &sdata->work);
2826 2827
	if (rx->sta)
		rx->sta->rx_packets++;
2828

2829
	return RX_QUEUED;
2830 2831
}

2832
/* TODO: use IEEE80211_RX_FRAGMENTED */
J
Johannes Berg 已提交
2833 2834
static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
					struct ieee80211_rate *rate)
2835 2836 2837 2838 2839
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_local *local = rx->local;
	struct sk_buff *skb = rx->skb, *skb2;
	struct net_device *prev_dev = NULL;
J
Johannes Berg 已提交
2840
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2841
	int needed_headroom;
2842

2843 2844 2845 2846 2847
	/*
	 * If cooked monitor has been processed already, then
	 * don't do it again. If not, set the flag.
	 */
	if (rx->flags & IEEE80211_RX_CMNTR)
2848
		goto out_free_skb;
2849
	rx->flags |= IEEE80211_RX_CMNTR;
2850

2851 2852 2853 2854
	/* If there are no cooked monitor interfaces, just free the SKB */
	if (!local->cooked_mntrs)
		goto out_free_skb;

2855
	/* room for the radiotap header based on driver features */
2856
	needed_headroom = ieee80211_rx_radiotap_space(local, status);
2857

2858 2859 2860
	if (skb_headroom(skb) < needed_headroom &&
	    pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
		goto out_free_skb;
2861

2862
	/* prepend radiotap information */
2863 2864
	ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
					 false);
2865 2866 2867 2868 2869 2870 2871

	skb_set_mac_header(skb, 0);
	skb->ip_summed = CHECKSUM_UNNECESSARY;
	skb->pkt_type = PACKET_OTHERHOST;
	skb->protocol = htons(ETH_P_802_2);

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2872
		if (!ieee80211_sdata_running(sdata))
2873 2874
			continue;

2875
		if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2876 2877 2878 2879 2880 2881 2882
		    !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
			continue;

		if (prev_dev) {
			skb2 = skb_clone(skb, GFP_ATOMIC);
			if (skb2) {
				skb2->dev = prev_dev;
2883
				netif_receive_skb(skb2);
2884 2885 2886 2887 2888 2889 2890 2891 2892 2893
			}
		}

		prev_dev = sdata->dev;
		sdata->dev->stats.rx_packets++;
		sdata->dev->stats.rx_bytes += skb->len;
	}

	if (prev_dev) {
		skb->dev = prev_dev;
2894
		netif_receive_skb(skb);
2895 2896
		return;
	}
2897 2898 2899 2900 2901

 out_free_skb:
	dev_kfree_skb(skb);
}

2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918
static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
					 ieee80211_rx_result res)
{
	switch (res) {
	case RX_DROP_MONITOR:
		I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
		if (rx->sta)
			rx->sta->rx_dropped++;
		/* fall through */
	case RX_CONTINUE: {
		struct ieee80211_rate *rate = NULL;
		struct ieee80211_supported_band *sband;
		struct ieee80211_rx_status *status;

		status = IEEE80211_SKB_RXCB((rx->skb));

		sband = rx->local->hw.wiphy->bands[status->band];
2919 2920
		if (!(status->flag & RX_FLAG_HT) &&
		    !(status->flag & RX_FLAG_VHT))
2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936
			rate = &sband->bitrates[status->rate_idx];

		ieee80211_rx_cooked_monitor(rx, rate);
		break;
		}
	case RX_DROP_UNUSABLE:
		I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
		if (rx->sta)
			rx->sta->rx_dropped++;
		dev_kfree_skb(rx->skb);
		break;
	case RX_QUEUED:
		I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
		break;
	}
}
2937

2938 2939
static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
				  struct sk_buff_head *frames)
2940 2941
{
	ieee80211_rx_result res = RX_DROP_MONITOR;
2942
	struct sk_buff *skb;
2943

2944 2945 2946 2947
#define CALL_RXH(rxh)			\
	do {				\
		res = rxh(rx);		\
		if (res != RX_CONTINUE)	\
2948
			goto rxh_next;  \
2949
	} while (0);
2950

2951
	spin_lock_bh(&rx->local->rx_path_lock);
2952

2953
	while ((skb = __skb_dequeue(frames))) {
2954 2955 2956 2957 2958 2959 2960 2961
		/*
		 * all the other fields are valid across frames
		 * that belong to an aMPDU since they are on the
		 * same TID from the same station
		 */
		rx->skb = skb;

		CALL_RXH(ieee80211_rx_h_check_more_data)
J
Johannes Berg 已提交
2962
		CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2963
		CALL_RXH(ieee80211_rx_h_sta_process)
2964
		CALL_RXH(ieee80211_rx_h_decrypt)
2965 2966 2967
		CALL_RXH(ieee80211_rx_h_defragment)
		CALL_RXH(ieee80211_rx_h_michael_mic_verify)
		/* must be after MMIC verify so header is counted in MPDU mic */
I
Ingo Molnar 已提交
2968
#ifdef CONFIG_MAC80211_MESH
2969
		if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2970
			CALL_RXH(ieee80211_rx_h_mesh_fwding);
I
Ingo Molnar 已提交
2971
#endif
2972
		CALL_RXH(ieee80211_rx_h_amsdu)
2973
		CALL_RXH(ieee80211_rx_h_data)
2974 2975 2976 2977 2978 2979

		/* special treatment -- needs the queue */
		res = ieee80211_rx_h_ctrl(rx, frames);
		if (res != RX_CONTINUE)
			goto rxh_next;

2980
		CALL_RXH(ieee80211_rx_h_mgmt_check)
2981
		CALL_RXH(ieee80211_rx_h_action)
2982 2983
		CALL_RXH(ieee80211_rx_h_userspace_mgmt)
		CALL_RXH(ieee80211_rx_h_action_return)
2984
		CALL_RXH(ieee80211_rx_h_mgmt)
2985

2986 2987
 rxh_next:
		ieee80211_rx_handlers_result(rx, res);
2988

2989
#undef CALL_RXH
2990
	}
2991

2992
	spin_unlock_bh(&rx->local->rx_path_lock);
2993 2994
}

2995
static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2996
{
2997
	struct sk_buff_head reorder_release;
2998 2999
	ieee80211_rx_result res = RX_DROP_MONITOR;

3000 3001
	__skb_queue_head_init(&reorder_release);

3002 3003 3004 3005 3006 3007 3008 3009 3010
#define CALL_RXH(rxh)			\
	do {				\
		res = rxh(rx);		\
		if (res != RX_CONTINUE)	\
			goto rxh_next;  \
	} while (0);

	CALL_RXH(ieee80211_rx_h_check)

3011
	ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3012

3013
	ieee80211_rx_handlers(rx, &reorder_release);
3014
	return;
3015

3016
 rxh_next:
3017 3018 3019
	ieee80211_rx_handlers_result(rx, res);

#undef CALL_RXH
3020 3021
}

3022
/*
3023 3024
 * This function makes calls into the RX path, therefore
 * it has to be invoked under RCU read lock.
3025 3026 3027
 */
void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
{
3028
	struct sk_buff_head frames;
3029 3030 3031 3032
	struct ieee80211_rx_data rx = {
		.sta = sta,
		.sdata = sta->sdata,
		.local = sta->local,
3033 3034 3035
		/* This is OK -- must be QoS data frame */
		.security_idx = tid,
		.seqno_idx = tid,
3036
		.flags = 0,
3037
	};
3038 3039 3040 3041 3042
	struct tid_ampdu_rx *tid_agg_rx;

	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
	if (!tid_agg_rx)
		return;
3043

3044 3045
	__skb_queue_head_init(&frames);

3046
	spin_lock(&tid_agg_rx->reorder_lock);
3047
	ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3048
	spin_unlock(&tid_agg_rx->reorder_lock);
3049

3050
	ieee80211_rx_handlers(&rx, &frames);
3051 3052
}

3053 3054
/* main receive path */

3055
static int prepare_for_handlers(struct ieee80211_rx_data *rx,
3056 3057
				struct ieee80211_hdr *hdr)
{
3058
	struct ieee80211_sub_if_data *sdata = rx->sdata;
J
Johannes Berg 已提交
3059 3060 3061
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3062 3063
	int multicast = is_multicast_ether_addr(hdr->addr1);

3064
	switch (sdata->vif.type) {
3065
	case NL80211_IFTYPE_STATION:
3066
		if (!bssid && !sdata->u.mgd.use_4addr)
3067
			return 0;
3068
		if (!multicast &&
3069
		    !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3070 3071
			if (!(sdata->dev->flags & IFF_PROMISC) ||
			    sdata->u.mgd.use_4addr)
3072
				return 0;
3073
			status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3074 3075
		}
		break;
3076
	case NL80211_IFTYPE_ADHOC:
3077 3078
		if (!bssid)
			return 0;
3079 3080 3081
		if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
		    ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
			return 0;
3082
		if (ieee80211_is_beacon(hdr->frame_control)) {
B
Bruno Randolf 已提交
3083
			return 1;
J
Johannes Berg 已提交
3084 3085
		} else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
			return 0;
3086
		} else if (!multicast &&
3087
			   !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3088
			if (!(sdata->dev->flags & IFF_PROMISC))
3089
				return 0;
3090
			status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3091 3092
		} else if (!rx->sta) {
			int rate_idx;
3093 3094
			if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
				rate_idx = 0; /* TODO: HT/VHT rates */
3095
			else
J
Johannes Berg 已提交
3096
				rate_idx = status->rate_idx;
3097 3098
			ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
						 BIT(rate_idx));
3099
		}
3100
		break;
3101
	case NL80211_IFTYPE_MESH_POINT:
3102
		if (!multicast &&
3103
		    !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3104 3105 3106
			if (!(sdata->dev->flags & IFF_PROMISC))
				return 0;

3107
			status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3108 3109
		}
		break;
3110 3111
	case NL80211_IFTYPE_AP_VLAN:
	case NL80211_IFTYPE_AP:
3112
		if (!bssid) {
3113
			if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3114
				return 0;
3115
		} else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3116 3117 3118 3119 3120 3121
			/*
			 * Accept public action frames even when the
			 * BSSID doesn't match, this is used for P2P
			 * and location updates. Note that mac80211
			 * itself never looks at these frames.
			 */
3122 3123 3124
			if (!multicast &&
			    !ether_addr_equal(sdata->vif.addr, hdr->addr1))
				return 0;
J
Johannes Berg 已提交
3125
			if (ieee80211_is_public_action(hdr, skb->len))
3126
				return 1;
J
Johannes Berg 已提交
3127
			if (!ieee80211_is_beacon(hdr->frame_control))
3128
				return 0;
3129
			status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3130 3131
		}
		break;
3132
	case NL80211_IFTYPE_WDS:
3133
		if (bssid || !ieee80211_is_data(hdr->frame_control))
3134
			return 0;
3135
		if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3136 3137
			return 0;
		break;
3138 3139 3140 3141 3142 3143
	case NL80211_IFTYPE_P2P_DEVICE:
		if (!ieee80211_is_public_action(hdr, skb->len) &&
		    !ieee80211_is_probe_req(hdr->frame_control) &&
		    !ieee80211_is_probe_resp(hdr->frame_control) &&
		    !ieee80211_is_beacon(hdr->frame_control))
			return 0;
3144 3145
		if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
		    !multicast)
3146 3147
			status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
		break;
3148
	default:
J
Johannes Berg 已提交
3149
		/* should never get here */
3150
		WARN_ON_ONCE(1);
J
Johannes Berg 已提交
3151
		break;
3152 3153 3154 3155 3156
	}

	return 1;
}

3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172
/*
 * This function returns whether or not the SKB
 * was destined for RX processing or not, which,
 * if consume is true, is equivalent to whether
 * or not the skb was consumed.
 */
static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
					    struct sk_buff *skb, bool consume)
{
	struct ieee80211_local *local = rx->local;
	struct ieee80211_sub_if_data *sdata = rx->sdata;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
	int prepares;

	rx->skb = skb;
3173
	status->rx_flags |= IEEE80211_RX_RA_MATCH;
3174 3175 3176 3177 3178 3179 3180 3181 3182 3183
	prepares = prepare_for_handlers(rx, hdr);

	if (!prepares)
		return false;

	if (!consume) {
		skb = skb_copy(skb, GFP_ATOMIC);
		if (!skb) {
			if (net_ratelimit())
				wiphy_debug(local->hw.wiphy,
3184
					"failed to copy skb for %s\n",
3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195
					sdata->name);
			return true;
		}

		rx->skb = skb;
	}

	ieee80211_invoke_rx_handlers(rx);
	return true;
}

3196
/*
3197 3198
 * This is the actual Rx frames handler. as it blongs to Rx path it must
 * be called with rcu_read_lock protection.
3199
 */
3200
static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3201
					 struct sk_buff *skb)
3202 3203 3204 3205
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_hdr *hdr;
Z
Zhu Yi 已提交
3206
	__le16 fc;
3207
	struct ieee80211_rx_data rx;
3208
	struct ieee80211_sub_if_data *prev;
3209
	struct sta_info *sta, *tmp, *prev_sta;
Z
Zhu Yi 已提交
3210
	int err = 0;
3211

Z
Zhu Yi 已提交
3212
	fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3213 3214 3215
	memset(&rx, 0, sizeof(rx));
	rx.skb = skb;
	rx.local = local;
3216

Z
Zhu Yi 已提交
3217
	if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3218 3219
		local->dot11ReceivedFragmentCount++;

3220 3221 3222 3223 3224 3225 3226
	if (ieee80211_is_mgmt(fc)) {
		/* drop frame if too short for header */
		if (skb->len < ieee80211_hdrlen(fc))
			err = -ENOBUFS;
		else
			err = skb_linearize(skb);
	} else {
Z
Zhu Yi 已提交
3227
		err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3228
	}
Z
Zhu Yi 已提交
3229 3230 3231 3232 3233 3234 3235

	if (err) {
		dev_kfree_skb(skb);
		return;
	}

	hdr = (struct ieee80211_hdr *)skb->data;
3236
	ieee80211_parse_qos(&rx);
3237
	ieee80211_verify_alignment(&rx);
3238

J
Johannes Berg 已提交
3239 3240 3241 3242
	if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
		     ieee80211_is_beacon(hdr->frame_control)))
		ieee80211_scan_rx(local, skb);

Z
Zhu Yi 已提交
3243
	if (ieee80211_is_data(fc)) {
3244
		prev_sta = NULL;
3245

3246
		for_each_sta_info(local, hdr->addr2, sta, tmp) {
3247 3248 3249 3250 3251 3252 3253
			if (!prev_sta) {
				prev_sta = sta;
				continue;
			}

			rx.sta = prev_sta;
			rx.sdata = prev_sta->sdata;
3254
			ieee80211_prepare_and_rx_handle(&rx, skb, false);
3255

3256
			prev_sta = sta;
3257
		}
3258 3259 3260 3261 3262

		if (prev_sta) {
			rx.sta = prev_sta;
			rx.sdata = prev_sta->sdata;

3263
			if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3264
				return;
3265
			goto out;
3266
		}
3267 3268
	}

3269
	prev = NULL;
3270

3271 3272 3273
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(sdata))
			continue;
J
Johannes Berg 已提交
3274

3275 3276 3277
		if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
		    sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
			continue;
J
Johannes Berg 已提交
3278

3279 3280 3281 3282 3283
		/*
		 * frame is destined for this interface, but if it's
		 * not also for the previous one we handle that after
		 * the loop to avoid copying the SKB once too much
		 */
3284

3285
		if (!prev) {
3286
			prev = sdata;
3287
			continue;
J
Johannes Berg 已提交
3288
		}
3289

3290
		rx.sta = sta_info_get_bss(prev, hdr->addr2);
3291 3292
		rx.sdata = prev;
		ieee80211_prepare_and_rx_handle(&rx, skb, false);
3293

3294 3295 3296 3297
		prev = sdata;
	}

	if (prev) {
3298
		rx.sta = sta_info_get_bss(prev, hdr->addr2);
3299
		rx.sdata = prev;
3300

3301 3302
		if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
			return;
3303
	}
3304

3305
 out:
3306
	dev_kfree_skb(skb);
3307
}
3308 3309 3310 3311 3312

/*
 * This is the receive path handler. It is called by a low level driver when an
 * 802.11 MPDU is received from the hardware.
 */
3313
void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3314 3315
{
	struct ieee80211_local *local = hw_to_local(hw);
3316 3317
	struct ieee80211_rate *rate = NULL;
	struct ieee80211_supported_band *sband;
3318
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3319

3320 3321
	WARN_ON_ONCE(softirq_count() == 0);

J
Johannes Berg 已提交
3322
	if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
J
Johannes Berg 已提交
3323
		goto drop;
3324 3325

	sband = local->hw.wiphy->bands[status->band];
J
Johannes Berg 已提交
3326 3327
	if (WARN_ON(!sband))
		goto drop;
3328

J
Johannes Berg 已提交
3329 3330 3331 3332 3333 3334 3335
	/*
	 * If we're suspending, it is possible although not too likely
	 * that we'd be receiving frames after having already partially
	 * quiesced the stack. We can't process such frames then since
	 * that might, for example, cause stations to be added or other
	 * driver callbacks be invoked.
	 */
J
Johannes Berg 已提交
3336 3337
	if (unlikely(local->quiescing || local->suspended))
		goto drop;
J
Johannes Berg 已提交
3338

3339 3340 3341 3342
	/* We might be during a HW reconfig, prevent Rx for the same reason */
	if (unlikely(local->in_reconfig))
		goto drop;

3343 3344 3345 3346
	/*
	 * The same happens when we're not even started,
	 * but that's worth a warning.
	 */
J
Johannes Berg 已提交
3347 3348
	if (WARN_ON(!local->started))
		goto drop;
3349

3350
	if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3351
		/*
3352 3353
		 * Validate the rate, unless a PLCP error means that
		 * we probably can't have a valid rate here anyway.
3354
		 */
3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366

		if (status->flag & RX_FLAG_HT) {
			/*
			 * rate_idx is MCS index, which can be [0-76]
			 * as documented on:
			 *
			 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
			 *
			 * Anything else would be some sort of driver or
			 * hardware error. The driver should catch hardware
			 * errors.
			 */
J
Johannes Berg 已提交
3367
			if (WARN(status->rate_idx > 76,
3368 3369 3370 3371 3372 3373
				 "Rate marked as an HT rate but passed "
				 "status->rate_idx is not "
				 "an MCS index [0-76]: %d (0x%02x)\n",
				 status->rate_idx,
				 status->rate_idx))
				goto drop;
3374 3375 3376 3377 3378 3379 3380
		} else if (status->flag & RX_FLAG_VHT) {
			if (WARN_ONCE(status->rate_idx > 9 ||
				      !status->vht_nss ||
				      status->vht_nss > 8,
				      "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
				      status->rate_idx, status->vht_nss))
				goto drop;
3381
		} else {
J
Johannes Berg 已提交
3382
			if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3383 3384 3385
				goto drop;
			rate = &sband->bitrates[status->rate_idx];
		}
3386
	}
3387

3388 3389
	status->rx_flags = 0;

3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402
	/*
	 * key references and virtual interfaces are protected using RCU
	 * and this requires that we are in a read-side RCU section during
	 * receive processing
	 */
	rcu_read_lock();

	/*
	 * Frames with failed FCS/PLCP checksum are not returned,
	 * all other frames are returned without radiotap header
	 * if it was previously present.
	 * Also, frames with less than 16 bytes are dropped.
	 */
3403
	skb = ieee80211_rx_monitor(local, skb, rate);
3404 3405 3406 3407 3408
	if (!skb) {
		rcu_read_unlock();
		return;
	}

3409 3410 3411
	ieee80211_tpt_led_trig_rx(local,
			((struct ieee80211_hdr *)skb->data)->frame_control,
			skb->len);
3412
	__ieee80211_rx_handle_packet(hw, skb);
3413 3414

	rcu_read_unlock();
J
Johannes Berg 已提交
3415 3416 3417 3418

	return;
 drop:
	kfree_skb(skb);
3419
}
3420
EXPORT_SYMBOL(ieee80211_rx);
3421 3422 3423

/* This is a version of the rx handler that can be called from hard irq
 * context. Post the skb on the queue and schedule the tasklet */
3424
void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3425 3426 3427 3428 3429 3430 3431 3432 3433 3434
{
	struct ieee80211_local *local = hw_to_local(hw);

	BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));

	skb->pkt_type = IEEE80211_RX_MSG;
	skb_queue_tail(&local->skb_queue, skb);
	tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee80211_rx_irqsafe);