rx.c 119.0 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
 * Copyright 2013-2014  Intel Mobile Communications GmbH
7
 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
8 9 10 11 12 13
 *
 * 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.
 */

14
#include <linux/jiffies.h>
15
#include <linux/slab.h>
16 17 18 19
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
20
#include <linux/rcupdate.h>
21
#include <linux/export.h>
22
#include <linux/bitops.h>
23 24
#include <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
25
#include <asm/unaligned.h>
26 27

#include "ieee80211_i.h"
28
#include "driver-ops.h"
J
Johannes Berg 已提交
29
#include "led.h"
30
#include "mesh.h"
31 32 33 34
#include "wep.h"
#include "wpa.h"
#include "tkip.h"
#include "wme.h"
35
#include "rate.h"
36

37 38 39 40 41 42 43 44 45 46
static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
{
	struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);

	u64_stats_update_begin(&tstats->syncp);
	tstats->rx_packets++;
	tstats->rx_bytes += len;
	u64_stats_update_end(&tstats->syncp);
}

47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91
static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
			       enum nl80211_iftype type)
{
	__le16 fc = hdr->frame_control;

	if (ieee80211_is_data(fc)) {
		if (len < 24) /* drop incorrect hdr len (data) */
			return NULL;

		if (ieee80211_has_a4(fc))
			return NULL;
		if (ieee80211_has_tods(fc))
			return hdr->addr1;
		if (ieee80211_has_fromds(fc))
			return hdr->addr2;

		return hdr->addr3;
	}

	if (ieee80211_is_mgmt(fc)) {
		if (len < 24) /* drop incorrect hdr len (mgmt) */
			return NULL;
		return hdr->addr3;
	}

	if (ieee80211_is_ctl(fc)) {
		if (ieee80211_is_pspoll(fc))
			return hdr->addr1;

		if (ieee80211_is_back_req(fc)) {
			switch (type) {
			case NL80211_IFTYPE_STATION:
				return hdr->addr2;
			case NL80211_IFTYPE_AP:
			case NL80211_IFTYPE_AP_VLAN:
				return hdr->addr1;
			default:
				break; /* fall through to the return */
			}
		}
	}

	return NULL;
}

92 93 94 95 96 97 98
/*
 * 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,
99 100
					   struct sk_buff *skb,
					   unsigned int rtap_vendor_space)
101
{
102
	if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
103
		if (likely(skb->len > FCS_LEN))
Z
Zhu Yi 已提交
104
			__pskb_trim(skb, skb->len - FCS_LEN);
105 106 107 108
		else {
			/* driver bug */
			WARN_ON(1);
			dev_kfree_skb(skb);
109
			return NULL;
110 111 112
		}
	}

113 114
	__pskb_pull(skb, rtap_vendor_space);

115 116 117
	return skb;
}

118 119
static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
				     unsigned int rtap_vendor_space)
120
{
121
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
122 123 124
	struct ieee80211_hdr *hdr;

	hdr = (void *)(skb->data + rtap_vendor_space);
125

126
	if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
127 128
			    RX_FLAG_FAILED_PLCP_CRC |
			    RX_FLAG_ONLY_MONITOR))
129 130
		return true;

131
	if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
132 133
		return true;

H
Harvey Harrison 已提交
134 135 136
	if (ieee80211_is_ctl(hdr->frame_control) &&
	    !ieee80211_is_pspoll(hdr->frame_control) &&
	    !ieee80211_is_back_req(hdr->frame_control))
137 138 139
		return true;

	return false;
140 141
}

142
static int
143 144 145
ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
			     struct ieee80211_rx_status *status,
			     struct sk_buff *skb)
146 147 148 149
{
	int len;

	/* always present fields */
150
	len = sizeof(struct ieee80211_radiotap_header) + 8;
151

152 153 154
	/* allocate extra bitmaps */
	if (status->chains)
		len += 4 * hweight8(status->chains);
155 156 157

	if (ieee80211_have_rx_timestamp(status)) {
		len = ALIGN(len, 8);
158
		len += 8;
159
	}
160
	if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
161 162
		len += 1;

163 164 165 166
	/* antenna field, if we don't have per-chain info */
	if (!status->chains)
		len += 1;

167 168
	/* padding for RX_FLAGS if necessary */
	len = ALIGN(len, 2);
169

170 171 172
	if (status->flag & RX_FLAG_HT) /* HT info */
		len += 3;

173
	if (status->flag & RX_FLAG_AMPDU_DETAILS) {
174
		len = ALIGN(len, 4);
175 176 177
		len += 8;
	}

178 179 180 181 182
	if (status->flag & RX_FLAG_VHT) {
		len = ALIGN(len, 2);
		len += 12;
	}

183 184 185 186 187
	if (local->hw.radiotap_timestamp.units_pos >= 0) {
		len = ALIGN(len, 8);
		len += 12;
	}

188 189 190 191 192
	if (status->chains) {
		/* antenna and antenna signal fields */
		len += 2 * hweight8(status->chains);
	}

193 194 195 196 197 198 199 200 201 202 203 204 205 206 207
	if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
		struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;

		/* vendor presence bitmap */
		len += 4;
		/* alignment for fixed 6-byte vendor data header */
		len = ALIGN(len, 2);
		/* vendor data header */
		len += 6;
		if (WARN_ON(rtap->align == 0))
			rtap->align = 1;
		len = ALIGN(len, rtap->align);
		len += rtap->len + rtap->pad;
	}

208 209 210
	return len;
}

211
/*
212 213 214 215 216 217 218 219
 * 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,
220
				 int rtap_len, bool has_fcs)
221
{
222
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
223 224
	struct ieee80211_radiotap_header *rthdr;
	unsigned char *pos;
225 226
	__le32 *it_present;
	u32 it_present_val;
227
	u16 rx_flags = 0;
228
	u16 channel_flags = 0;
229 230
	int mpdulen, chain;
	unsigned long chains = status->chains;
231 232 233 234 235 236 237
	struct ieee80211_vendor_radiotap rtap = {};

	if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
		rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
		/* rtap.len and rtap.pad are undone immediately */
		skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
	}
238 239

	mpdulen = skb->len;
240
	if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
241
		mpdulen += FCS_LEN;
242 243

	rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
244
	memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
245
	it_present = &rthdr->it_present;
246 247

	/* radiotap header, set always present flags */
248
	rthdr->it_len = cpu_to_le16(rtap_len);
249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264
	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);
	}
265

266 267 268 269 270 271 272 273
	if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
		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 = rtap.present;
	}

274 275 276 277
	put_unaligned_le32(it_present_val, it_present);

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

278 279 280
	/* the order of the following fields is important */

	/* IEEE80211_RADIOTAP_TSFT */
281
	if (ieee80211_have_rx_timestamp(status)) {
282 283 284
		/* padding */
		while ((pos - (u8 *)rthdr) & 7)
			*pos++ = 0;
285 286 287 288
		put_unaligned_le64(
			ieee80211_calculate_rx_timestamp(local, status,
							 mpdulen, 0),
			pos);
J
Johannes Berg 已提交
289
		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
290 291 292 293
		pos += 8;
	}

	/* IEEE80211_RADIOTAP_FLAGS */
294
	if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
295
		*pos |= IEEE80211_RADIOTAP_F_FCS;
J
Johannes Berg 已提交
296 297
	if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
		*pos |= IEEE80211_RADIOTAP_F_BADFCS;
298 299
	if (status->flag & RX_FLAG_SHORTPRE)
		*pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
300 301 302
	pos++;

	/* IEEE80211_RADIOTAP_RATE */
303
	if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
304
		/*
305
		 * Without rate information don't add it. If we have,
306
		 * MCS information is a separate field in radiotap,
307 308
		 * added below. The byte here is needed as padding
		 * for the channel though, so initialise it to 0.
309 310
		 */
		*pos = 0;
311
	} else {
312
		int shift = 0;
313
		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
314 315 316 317 318
		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));
319
	}
320 321 322
	pos++;

	/* IEEE80211_RADIOTAP_CHANNEL */
323
	put_unaligned_le16(status->freq, pos);
324
	pos += 2;
325 326 327 328 329
	if (status->flag & RX_FLAG_10MHZ)
		channel_flags |= IEEE80211_CHAN_HALF;
	else if (status->flag & RX_FLAG_5MHZ)
		channel_flags |= IEEE80211_CHAN_QUARTER;

330
	if (status->band == NL80211_BAND_5GHZ)
331
		channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
332
	else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
333
		channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
334
	else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
335
		channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
336
	else if (rate)
337
		channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
338
	else
339 340
		channel_flags |= IEEE80211_CHAN_2GHZ;
	put_unaligned_le16(channel_flags, pos);
341 342 343
	pos += 2;

	/* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
344
	if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
345
	    !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
346 347 348 349 350 351 352 353
		*pos = status->signal;
		rthdr->it_present |=
			cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
		pos++;
	}

	/* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */

354 355 356 357 358
	if (!status->chains) {
		/* IEEE80211_RADIOTAP_ANTENNA */
		*pos = status->antenna;
		pos++;
	}
359 360 361 362 363

	/* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */

	/* IEEE80211_RADIOTAP_RX_FLAGS */
	/* ensure 2 byte alignment for the 2 byte field as required */
364
	if ((pos - (u8 *)rthdr) & 1)
365
		*pos++ = 0;
J
Johannes Berg 已提交
366
	if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
367 368
		rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
	put_unaligned_le16(rx_flags, pos);
369
	pos += 2;
370 371

	if (status->flag & RX_FLAG_HT) {
372 373
		unsigned int stbc;

374
		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
375
		*pos++ = local->hw.radiotap_mcs_details;
376 377 378 379 380
		*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;
381 382
		if (status->flag & RX_FLAG_HT_GF)
			*pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
383 384
		if (status->flag & RX_FLAG_LDPC)
			*pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
385 386
		stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
		*pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
387 388 389
		pos++;
		*pos++ = status->rate_idx;
	}
390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416

	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_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;
	}
417

418 419 420 421 422 423 424 425 426
	if (status->flag & RX_FLAG_VHT) {
		u16 known = local->hw.radiotap_vht_details;

		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
		put_unaligned_le16(known, pos);
		pos += 2;
		/* flags */
		if (status->flag & RX_FLAG_SHORT_GI)
			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
427 428 429
		/* in VHT, STBC is binary */
		if (status->flag & RX_FLAG_STBC_MASK)
			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
430 431
		if (status->vht_flag & RX_VHT_FLAG_BF)
			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
432 433
		pos++;
		/* bandwidth */
434
		if (status->vht_flag & RX_VHT_FLAG_80MHZ)
435
			*pos++ = 4;
436
		else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
437 438 439 440 441 442 443 444 445
			*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 */
446 447
		if (status->flag & RX_FLAG_LDPC)
			*pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
448 449 450 451 452 453 454
		pos++;
		/* group ID */
		pos++;
		/* partial_aid */
		pos += 2;
	}

455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479
	if (local->hw.radiotap_timestamp.units_pos >= 0) {
		u16 accuracy = 0;
		u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;

		rthdr->it_present |=
			cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);

		/* ensure 8 byte alignment */
		while ((pos - (u8 *)rthdr) & 7)
			pos++;

		put_unaligned_le64(status->device_timestamp, pos);
		pos += sizeof(u64);

		if (local->hw.radiotap_timestamp.accuracy >= 0) {
			accuracy = local->hw.radiotap_timestamp.accuracy;
			flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
		}
		put_unaligned_le16(accuracy, pos);
		pos += sizeof(u16);

		*pos++ = local->hw.radiotap_timestamp.units_pos;
		*pos++ = flags;
	}

480 481 482 483
	for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
		*pos++ = status->chain_signal[chain];
		*pos++ = chain;
	}
484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499

	if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
		/* ensure 2 byte alignment for the vendor field as required */
		if ((pos - (u8 *)rthdr) & 1)
			*pos++ = 0;
		*pos++ = rtap.oui[0];
		*pos++ = rtap.oui[1];
		*pos++ = rtap.oui[2];
		*pos++ = rtap.subns;
		put_unaligned_le16(rtap.len, pos);
		pos += 2;
		/* align the actual payload as requested */
		while ((pos - (u8 *)rthdr) & (rtap.align - 1))
			*pos++ = 0;
		/* data (and possible padding) already follows */
	}
500 501
}

502 503 504 505 506 507 508
/*
 * 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,
509
		     struct ieee80211_rate *rate)
510
{
511
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
512
	struct ieee80211_sub_if_data *sdata;
513
	int rt_hdrlen, needed_headroom;
514 515 516
	struct sk_buff *skb, *skb2;
	struct net_device *prev_dev = NULL;
	int present_fcs_len = 0;
517
	unsigned int rtap_vendor_space = 0;
518 519 520
	struct ieee80211_mgmt *mgmt;
	struct ieee80211_sub_if_data *monitor_sdata =
		rcu_dereference(local->monitor_sdata);
521 522 523 524 525 526

	if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
		struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;

		rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
	}
527 528 529 530 531 532 533 534 535

	/*
	 * 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
536

537
	if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
538 539
		present_fcs_len = FCS_LEN;

540 541
	/* ensure hdr->frame_control and vendor radiotap data are in skb head */
	if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
Z
Zhu Yi 已提交
542 543 544 545
		dev_kfree_skb(origskb);
		return NULL;
	}

546
	if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
547 548
		if (should_drop_frame(origskb, present_fcs_len,
				      rtap_vendor_space)) {
549 550 551 552
			dev_kfree_skb(origskb);
			return NULL;
		}

553
		return remove_monitor_info(local, origskb, rtap_vendor_space);
554 555
	}

556
	/* room for the radiotap header based on driver features */
557 558
	rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
	needed_headroom = rt_hdrlen - rtap_vendor_space;
559

560
	if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
561 562 563 564 565 566 567 568 569 570 571 572
		/* 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 &&
573
		    pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
574 575 576 577 578 579 580 581 582 583
			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);

584 585
		origskb = remove_monitor_info(local, origskb,
					      rtap_vendor_space);
586 587 588 589 590

		if (!skb)
			return origskb;
	}

J
Johannes Berg 已提交
591
	/* prepend radiotap information */
592
	ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
593

594
	skb_reset_mac_header(skb);
595 596 597 598 599
	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) {
600
		if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
601 602
			continue;

603
		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
604 605
			continue;

606
		if (!ieee80211_sdata_running(sdata))
607 608
			continue;

609 610 611 612
		if (prev_dev) {
			skb2 = skb_clone(skb, GFP_ATOMIC);
			if (skb2) {
				skb2->dev = prev_dev;
613
				netif_receive_skb(skb2);
614 615 616 617
			}
		}

		prev_dev = sdata->dev;
618
		ieee80211_rx_stats(sdata->dev, skb->len);
619 620
	}

621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637
	mgmt = (void *)skb->data;
	if (monitor_sdata &&
	    skb->len >= IEEE80211_MIN_ACTION_SIZE + 1 + VHT_MUMIMO_GROUPS_DATA_LEN &&
	    ieee80211_is_action(mgmt->frame_control) &&
	    mgmt->u.action.category == WLAN_CATEGORY_VHT &&
	    mgmt->u.action.u.vht_group_notif.action_code == WLAN_VHT_ACTION_GROUPID_MGMT &&
	    is_valid_ether_addr(monitor_sdata->u.mntr.mu_follow_addr) &&
	    ether_addr_equal(mgmt->da, monitor_sdata->u.mntr.mu_follow_addr)) {
		struct sk_buff *mu_skb = skb_copy(skb, GFP_ATOMIC);

		if (mu_skb) {
			mu_skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
			skb_queue_tail(&monitor_sdata->skb_queue, mu_skb);
			ieee80211_queue_work(&local->hw, &monitor_sdata->work);
		}
	}

638 639
	if (prev_dev) {
		skb->dev = prev_dev;
640
		netif_receive_skb(skb);
641 642 643 644 645 646
	} else
		dev_kfree_skb(skb);

	return origskb;
}

647
static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
648
{
649
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
650
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
651
	int tid, seqno_idx, security_idx;
652 653

	/* does the frame have a qos control field? */
654 655
	if (ieee80211_is_data_qos(hdr->frame_control)) {
		u8 *qc = ieee80211_get_qos_ctl(hdr);
656
		/* frame has qos control */
657
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
658
		if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
659
			status->rx_flags |= IEEE80211_RX_AMSDU;
660 661 662

		seqno_idx = tid;
		security_idx = tid;
663
	} else {
664 665 666 667 668 669 670 671 672 673 674
		/*
		 * 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.
		 */
675
		seqno_idx = IEEE80211_NUM_TIDS;
676 677
		security_idx = 0;
		if (ieee80211_is_mgmt(hdr->frame_control))
678
			security_idx = IEEE80211_NUM_TIDS;
679
		tid = 0;
680
	}
681

682 683
	rx->seqno_idx = seqno_idx;
	rx->security_idx = security_idx;
684 685 686
	/* 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;
687
}
688

689 690 691 692 693 694 695 696 697 698 699
/**
 * 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
700 701 702
 * 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.
703 704 705 706 707 708 709
 *
 * 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
710
 * Padding like Atheros hardware adds which is between the 802.11 header and
711 712 713 714
 * 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)
715
{
716
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
717
	WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
718
#endif
719 720
}

721

722 723
/* rx handlers */

724 725 726 727
static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;

728
	if (is_multicast_ether_addr(hdr->addr1))
729 730
		return 0;

731
	return ieee80211_is_robust_mgmt_frame(skb);
732 733 734 735 736 737 738
}


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

739
	if (!is_multicast_ether_addr(hdr->addr1))
740 741
		return 0;

742
	return ieee80211_is_robust_mgmt_frame(skb);
743 744 745 746 747 748 749 750
}


/* 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;
751
	struct ieee80211_mmie_16 *mmie16;
752

J
Johannes Berg 已提交
753
	if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
754 755
		return -1;

756
	if (!ieee80211_is_robust_mgmt_frame(skb))
757 758 759 760
		return -1; /* not a robust management frame */

	mmie = (struct ieee80211_mmie *)
		(skb->data + skb->len - sizeof(*mmie));
761 762 763 764 765 766 767 768 769 770 771 772
	if (mmie->element_id == WLAN_EID_MMIE &&
	    mmie->length == sizeof(*mmie) - 2)
		return le16_to_cpu(mmie->key_id);

	mmie16 = (struct ieee80211_mmie_16 *)
		(skb->data + skb->len - sizeof(*mmie16));
	if (skb->len >= 24 + sizeof(*mmie16) &&
	    mmie16->element_id == WLAN_EID_MMIE &&
	    mmie16->length == sizeof(*mmie16) - 2)
		return le16_to_cpu(mmie16->key_id);

	return -1;
773 774
}

775 776
static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
				  struct sk_buff *skb)
777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	__le16 fc;
	int hdrlen;
	u8 keyid;

	fc = hdr->frame_control;
	hdrlen = ieee80211_hdrlen(fc);

	if (skb->len < hdrlen + cs->hdr_len)
		return -EINVAL;

	skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
	keyid &= cs->key_idx_mask;
	keyid >>= cs->key_idx_shift;

	return keyid;
}

J
Johannes Berg 已提交
796
static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
797
{
798
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
799
	char *dev_addr = rx->sdata->vif.addr;
800

801
	if (ieee80211_is_data(hdr->frame_control)) {
802 803
		if (is_multicast_ether_addr(hdr->addr1)) {
			if (ieee80211_has_tods(hdr->frame_control) ||
J
Johannes Berg 已提交
804
			    !ieee80211_has_fromds(hdr->frame_control))
805
				return RX_DROP_MONITOR;
806
			if (ether_addr_equal(hdr->addr3, dev_addr))
807 808 809 810
				return RX_DROP_MONITOR;
		} else {
			if (!ieee80211_has_a4(hdr->frame_control))
				return RX_DROP_MONITOR;
811
			if (ether_addr_equal(hdr->addr4, dev_addr))
812 813
				return RX_DROP_MONITOR;
		}
814 815 816 817 818 819
	}

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

820
	if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
821
		struct ieee80211_mgmt *mgmt;
822

823
		if (!ieee80211_is_mgmt(hdr->frame_control))
824 825
			return RX_DROP_MONITOR;

826
		if (ieee80211_is_action(hdr->frame_control)) {
827
			u8 category;
828 829 830 831 832

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

833
			mgmt = (struct ieee80211_mgmt *)hdr;
834 835
			category = mgmt->u.action.category;
			if (category != WLAN_CATEGORY_MESH_ACTION &&
J
Johannes Berg 已提交
836
			    category != WLAN_CATEGORY_SELF_PROTECTED)
837 838 839 840
				return RX_DROP_MONITOR;
			return RX_CONTINUE;
		}

841 842
		if (ieee80211_is_probe_req(hdr->frame_control) ||
		    ieee80211_is_probe_resp(hdr->frame_control) ||
843 844
		    ieee80211_is_beacon(hdr->frame_control) ||
		    ieee80211_is_auth(hdr->frame_control))
845 846 847 848 849
			return RX_CONTINUE;

		return RX_DROP_MONITOR;
	}

J
Johannes Berg 已提交
850 851
	return RX_CONTINUE;
}
852

853 854 855 856 857 858 859
static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
					      int index)
{
	struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
	struct sk_buff *tail = skb_peek_tail(frames);
	struct ieee80211_rx_status *status;

860 861 862
	if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
		return true;

863 864 865 866 867 868 869 870 871 872
	if (!tail)
		return false;

	status = IEEE80211_SKB_RXCB(tail);
	if (status->flag & RX_FLAG_AMSDU_MORE)
		return false;

	return true;
}

873
static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
874
					    struct tid_ampdu_rx *tid_agg_rx,
875 876
					    int index,
					    struct sk_buff_head *frames)
877
{
878 879
	struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
	struct sk_buff *skb;
880
	struct ieee80211_rx_status *status;
881

882 883
	lockdep_assert_held(&tid_agg_rx->reorder_lock);

884
	if (skb_queue_empty(skb_list))
885 886
		goto no_frame;

887
	if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
888 889 890 891 892
		__skb_queue_purge(skb_list);
		goto no_frame;
	}

	/* release frames from the reorder ring buffer */
893
	tid_agg_rx->stored_mpdu_num--;
894 895 896 897 898
	while ((skb = __skb_dequeue(skb_list))) {
		status = IEEE80211_SKB_RXCB(skb);
		status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
		__skb_queue_tail(frames, skb);
	}
899 900

no_frame:
901
	tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
902
	tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
903 904
}

905
static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
906
					     struct tid_ampdu_rx *tid_agg_rx,
907 908
					     u16 head_seq_num,
					     struct sk_buff_head *frames)
909 910 911
{
	int index;

912 913
	lockdep_assert_held(&tid_agg_rx->reorder_lock);

914
	while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
915
		index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
916 917
		ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
						frames);
918 919 920 921 922 923 924 925 926
	}
}

/*
 * 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.
927 928
 *
 * Callers must hold tid_agg_rx->reorder_lock.
929 930 931
 */
#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)

932
static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
933 934
					  struct tid_ampdu_rx *tid_agg_rx,
					  struct sk_buff_head *frames)
935
{
936
	int index, i, j;
937

938 939
	lockdep_assert_held(&tid_agg_rx->reorder_lock);

940
	/* release the buffer until next missing frame */
941
	index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
942
	if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
943
	    tid_agg_rx->stored_mpdu_num) {
944 945 946 947 948 949 950
		/*
		 * 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) {
951
			if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
952 953 954
				skipped++;
				continue;
			}
955 956
			if (skipped &&
			    !time_after(jiffies, tid_agg_rx->reorder_time[j] +
957
					HT_RX_REORDER_BUF_TIMEOUT))
958
				goto set_release_timer;
959

960 961 962 963 964
			/* don't leave incomplete A-MSDUs around */
			for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
			     i = (i + 1) % tid_agg_rx->buf_size)
				__skb_queue_purge(&tid_agg_rx->reorder_buf[i]);

J
Johannes Berg 已提交
965 966
			ht_dbg_ratelimited(sdata,
					   "release an RX reorder frame due to timeout on earlier frames\n");
967 968
			ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
							frames);
969 970 971 972 973

			/*
			 * Increment the head seq# also for the skipped slots.
			 */
			tid_agg_rx->head_seq_num =
974 975
				(tid_agg_rx->head_seq_num +
				 skipped) & IEEE80211_SN_MASK;
976 977
			skipped = 0;
		}
978
	} else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
979 980
		ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
						frames);
981
		index =	tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
982
	}
983 984

	if (tid_agg_rx->stored_mpdu_num) {
985
		j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
986 987 988

		for (; j != (index - 1) % tid_agg_rx->buf_size;
		     j = (j + 1) % tid_agg_rx->buf_size) {
989
			if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
990 991 992 993 994
				break;
		}

 set_release_timer:

995 996 997 998
		if (!tid_agg_rx->removed)
			mod_timer(&tid_agg_rx->reorder_timer,
				  tid_agg_rx->reorder_time[j] + 1 +
				  HT_RX_REORDER_BUF_TIMEOUT);
999 1000 1001
	} else {
		del_timer(&tid_agg_rx->reorder_timer);
	}
1002 1003
}

1004 1005 1006 1007 1008
/*
 * 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.
 */
1009
static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1010
					     struct tid_ampdu_rx *tid_agg_rx,
1011 1012
					     struct sk_buff *skb,
					     struct sk_buff_head *frames)
1013 1014
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1015
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1016 1017 1018 1019
	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;
1020
	bool ret = true;
1021

1022 1023
	spin_lock(&tid_agg_rx->reorder_lock);

1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
	/*
	 * Offloaded BA sessions have no known starting sequence number so pick
	 * one from first Rxed frame for this tid after BA was started.
	 */
	if (unlikely(tid_agg_rx->auto_seq)) {
		tid_agg_rx->auto_seq = false;
		tid_agg_rx->ssn = mpdu_seq_num;
		tid_agg_rx->head_seq_num = mpdu_seq_num;
	}

1034 1035 1036 1037
	buf_size = tid_agg_rx->buf_size;
	head_seq_num = tid_agg_rx->head_seq_num;

	/* frame with out of date sequence number */
1038
	if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1039
		dev_kfree_skb(skb);
1040
		goto out;
1041 1042 1043 1044 1045 1046
	}

	/*
	 * If frame the sequence number exceeds our buffering window
	 * size release some previous frames to make room for this one.
	 */
1047 1048 1049
	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));
1050
		/* release stored frames up to new head to stack */
1051
		ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1052
						 head_seq_num, frames);
1053 1054 1055 1056
	}

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

1057
	index = mpdu_seq_num % tid_agg_rx->buf_size;
1058 1059

	/* check if we already stored this frame */
1060
	if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1061
		dev_kfree_skb(skb);
1062
		goto out;
1063 1064 1065 1066 1067
	}

	/*
	 * If the current MPDU is in the right order and nothing else
	 * is stored we can process it directly, no need to buffer it.
1068 1069
	 * If it is first but there's something stored, we may be able
	 * to release frames after this one.
1070 1071 1072
	 */
	if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
	    tid_agg_rx->stored_mpdu_num == 0) {
1073 1074 1075
		if (!(status->flag & RX_FLAG_AMSDU_MORE))
			tid_agg_rx->head_seq_num =
				ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1076 1077
		ret = false;
		goto out;
1078 1079 1080
	}

	/* put the frame in the reordering buffer */
1081 1082 1083 1084 1085 1086
	__skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
	if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
		tid_agg_rx->reorder_time[index] = jiffies;
		tid_agg_rx->stored_mpdu_num++;
		ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
	}
1087

1088 1089 1090
 out:
	spin_unlock(&tid_agg_rx->reorder_lock);
	return ret;
1091 1092 1093 1094 1095 1096
}

/*
 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 * true if the MPDU was buffered, false if it should be processed.
 */
1097 1098
static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
				       struct sk_buff_head *frames)
1099
{
1100 1101
	struct sk_buff *skb = rx->skb;
	struct ieee80211_local *local = rx->local;
1102
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1103
	struct sta_info *sta = rx->sta;
1104 1105
	struct tid_ampdu_rx *tid_agg_rx;
	u16 sc;
1106
	u8 tid, ack_policy;
1107

1108 1109
	if (!ieee80211_is_data_qos(hdr->frame_control) ||
	    is_multicast_ether_addr(hdr->addr1))
1110
		goto dont_reorder;
1111 1112 1113 1114 1115 1116 1117

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

	if (!sta)
1118
		goto dont_reorder;
1119

1120 1121
	ack_policy = *ieee80211_get_qos_ctl(hdr) &
		     IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1122 1123
	tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;

1124
	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1125 1126 1127 1128 1129 1130 1131
	if (!tid_agg_rx) {
		if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
		    !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
		    !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
			ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
					     WLAN_BACK_RECIPIENT,
					     WLAN_REASON_QSTA_REQUIRE_SETUP);
1132
		goto dont_reorder;
1133
	}
1134 1135 1136

	/* qos null data frames are excluded */
	if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1137
		goto dont_reorder;
1138

1139 1140 1141 1142 1143
	/* 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;

1144 1145 1146 1147
	/* new, potentially un-ordered, ampdu frame - process it */

	/* reset session timer */
	if (tid_agg_rx->timeout)
1148
		tid_agg_rx->last_rx = jiffies;
1149 1150 1151 1152

	/* if this mpdu is fragmented - terminate rx aggregation session */
	sc = le16_to_cpu(hdr->seq_ctrl);
	if (sc & IEEE80211_SCTL_FRAG) {
1153
		skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1154 1155
		skb_queue_tail(&rx->sdata->skb_queue, skb);
		ieee80211_queue_work(&local->hw, &rx->sdata->work);
1156
		return;
1157 1158
	}

1159 1160 1161 1162 1163 1164 1165
	/*
	 * 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.
	 */
1166 1167
	if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
					     frames))
1168 1169 1170
		return;

 dont_reorder:
1171
	__skb_queue_tail(frames, skb);
1172
}
1173

1174
static ieee80211_rx_result debug_noinline
1175
ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1176
{
1177
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1178
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1179

1180 1181 1182
	if (status->flag & RX_FLAG_DUP_VALIDATED)
		return RX_CONTINUE;

1183 1184 1185 1186
	/*
	 * Drop duplicate 802.11 retransmissions
	 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
	 */
1187 1188 1189 1190 1191 1192 1193 1194 1195

	if (rx->skb->len < 24)
		return RX_CONTINUE;

	if (ieee80211_is_ctl(hdr->frame_control) ||
	    ieee80211_is_qos_nullfunc(hdr->frame_control) ||
	    is_multicast_ether_addr(hdr->addr1))
		return RX_CONTINUE;

1196 1197 1198 1199 1200 1201
	if (!rx->sta)
		return RX_CONTINUE;

	if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
		     rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
		I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1202
		rx->sta->rx_stats.num_duplicates++;
1203 1204 1205
		return RX_DROP_UNUSABLE;
	} else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
		rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1206 1207
	}

1208 1209 1210 1211 1212 1213 1214 1215
	return RX_CONTINUE;
}

static ieee80211_rx_result debug_noinline
ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;

1216 1217 1218
	/* Drop disallowed frame classes based on STA auth/assoc state;
	 * IEEE 802.11, Chap 5.5.
	 *
J
Johannes Berg 已提交
1219 1220
	 * mac80211 filters only based on association state, i.e. it drops
	 * Class 3 frames from not associated stations. hostapd sends
1221 1222 1223
	 * deauth/disassoc frames when needed. In addition, hostapd is
	 * responsible for filtering on both auth and assoc states.
	 */
1224

J
Johannes Berg 已提交
1225
	if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1226 1227
		return ieee80211_rx_mesh_check(rx);

1228 1229
	if (unlikely((ieee80211_is_data(hdr->frame_control) ||
		      ieee80211_is_pspoll(hdr->frame_control)) &&
1230
		     rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
B
Bill Jordan 已提交
1231
		     rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1232
		     rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
J
Johannes Berg 已提交
1233
		     (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1234 1235 1236 1237 1238 1239
		/*
		 * 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 &&
1240
		    ieee80211_is_data_present(hdr->frame_control)) {
1241 1242 1243 1244 1245 1246 1247 1248 1249 1250
			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)
1251 1252
				return RX_CONTINUE;
		}
1253 1254 1255 1256 1257 1258 1259

		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
1260
		return RX_DROP_MONITOR;
1261
	}
1262

1263
	return RX_CONTINUE;
1264 1265 1266
}


1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299
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;
}

1300
static void sta_ps_start(struct sta_info *sta)
1301
{
1302
	struct ieee80211_sub_if_data *sdata = sta->sdata;
1303
	struct ieee80211_local *local = sdata->local;
1304
	struct ps_data *ps;
1305
	int tid;
1306

1307 1308 1309 1310 1311 1312 1313
	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
1314
	set_sta_flag(sta, WLAN_STA_PS_STA);
1315
	if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1316
		drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
J
Johannes Berg 已提交
1317 1318
	ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
	       sta->sta.addr, sta->sta.aid);
1319

J
Johannes Berg 已提交
1320 1321
	ieee80211_clear_fast_xmit(sta);

1322 1323 1324 1325
	if (!sta->sta.txq[0])
		return;

	for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1326
		if (txq_has_queue(sta->sta.txq[tid]))
1327 1328 1329 1330
			set_bit(tid, &sta->txq_buffered_tids);
		else
			clear_bit(tid, &sta->txq_buffered_tids);
	}
1331 1332
}

1333
static void sta_ps_end(struct sta_info *sta)
1334
{
J
Johannes Berg 已提交
1335 1336
	ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
	       sta->sta.addr, sta->sta.aid);
1337

J
Johannes Berg 已提交
1338
	if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1339 1340 1341 1342 1343 1344 1345
		/*
		 * Clear the flag only if the other one is still set
		 * so that the TX path won't start TX'ing new frames
		 * directly ... In the case that the driver flag isn't
		 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
		 */
		clear_sta_flag(sta, WLAN_STA_PS_STA);
J
Johannes Berg 已提交
1346 1347
		ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
		       sta->sta.addr, sta->sta.aid);
1348 1349 1350
		return;
	}

1351 1352
	set_sta_flag(sta, WLAN_STA_PS_DELIVER);
	clear_sta_flag(sta, WLAN_STA_PS_STA);
1353
	ieee80211_sta_ps_deliver_wakeup(sta);
1354 1355
}

1356
int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1357
{
1358
	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1359 1360
	bool in_ps;

1361
	WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1362 1363

	/* Don't let the same PS state be set twice */
1364
	in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1365 1366 1367 1368
	if ((start && in_ps) || (!start && !in_ps))
		return -EINVAL;

	if (start)
1369
		sta_ps_start(sta);
1370
	else
1371
		sta_ps_end(sta);
1372 1373 1374 1375 1376

	return 0;
}
EXPORT_SYMBOL(ieee80211_sta_ps_transition);

1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393
void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
{
	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);

	if (test_sta_flag(sta, WLAN_STA_SP))
		return;

	if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
		ieee80211_sta_ps_deliver_poll_response(sta);
	else
		set_sta_flag(sta, WLAN_STA_PSPOLL);
}
EXPORT_SYMBOL(ieee80211_sta_pspoll);

void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
{
	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1394
	int ac = ieee80211_ac_from_tid(tid);
1395 1396

	/*
1397 1398
	 * If this AC is not trigger-enabled do nothing unless the
	 * driver is calling us after it already checked.
1399 1400 1401 1402 1403
	 *
	 * 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.
	 */
1404 1405
	if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
	    tid != IEEE80211_NUM_TIDS)
1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418
		return;

	/* if we are in a service period, do nothing */
	if (test_sta_flag(sta, WLAN_STA_SP))
		return;

	if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
		ieee80211_sta_ps_deliver_uapsd(sta);
	else
		set_sta_flag(sta, WLAN_STA_UAPSD);
}
EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);

J
Johannes Berg 已提交
1419 1420 1421 1422 1423 1424 1425
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);

1426
	if (!rx->sta)
J
Johannes Berg 已提交
1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437
		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.)
	 */
1438
	if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
J
Johannes Berg 已提交
1439 1440 1441 1442 1443 1444 1445
		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
1446
	if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
J
Johannes Berg 已提交
1447 1448 1449
		return RX_CONTINUE;

	if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1450
		ieee80211_sta_pspoll(&rx->sta->sta);
J
Johannes Berg 已提交
1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461

		/* 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))) {
1462
		u8 tid;
J
Johannes Berg 已提交
1463

1464
		tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
J
Johannes Berg 已提交
1465

1466
		ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
J
Johannes Berg 已提交
1467 1468 1469 1470 1471
	}

	return RX_CONTINUE;
}

1472
static ieee80211_rx_result debug_noinline
1473
ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1474 1475
{
	struct sta_info *sta = rx->sta;
J
Johannes Berg 已提交
1476 1477 1478
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1479
	int i;
1480 1481

	if (!sta)
1482
		return RX_CONTINUE;
1483

J
Johannes Berg 已提交
1484 1485
	/*
	 * Update last_rx only for IBSS packets which are for the current
1486 1487 1488 1489 1490
	 * 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
1491
	 */
1492
	if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1493
		u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1494
						NL80211_IFTYPE_ADHOC);
1495 1496
		if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
		    test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1497
			sta->rx_stats.last_rx = jiffies;
1498
			if (ieee80211_is_data(hdr->frame_control) &&
1499 1500 1501
			    !is_multicast_ether_addr(hdr->addr1))
				sta->rx_stats.last_rate =
					sta_stats_encode_rate(status);
1502
		}
1503
	} else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1504
		sta->rx_stats.last_rx = jiffies;
J
Johannes Berg 已提交
1505 1506
	} else if (!is_multicast_ether_addr(hdr->addr1)) {
		/*
1507 1508
		 * Mesh beacons will update last_rx when if they are found to
		 * match the current local configuration when processed.
1509
		 */
1510
		sta->rx_stats.last_rx = jiffies;
1511 1512
		if (ieee80211_is_data(hdr->frame_control))
			sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1513 1514
	}

1515 1516 1517
	if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
		ieee80211_sta_rx_notify(rx->sdata, hdr);

1518
	sta->rx_stats.fragments++;
1519 1520

	u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1521
	sta->rx_stats.bytes += rx->skb->len;
1522 1523
	u64_stats_update_end(&rx->sta->rx_stats.syncp);

1524
	if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1525
		sta->rx_stats.last_signal = status->signal;
1526
		ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1527
	}
1528

1529
	if (status->chains) {
1530
		sta->rx_stats.chains = status->chains;
1531 1532 1533 1534 1535 1536
		for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
			int signal = status->chain_signal[i];

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

1537
			sta->rx_stats.chain_signal_last[i] = signal;
1538
			ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1539
					-signal);
1540 1541 1542
		}
	}

1543 1544 1545 1546
	/*
	 * Change STA power saving mode only at the end of a frame
	 * exchange sequence.
	 */
1547
	if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1548
	    !ieee80211_has_morefrags(hdr->frame_control) &&
1549
	    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1550
	    (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1551 1552 1553 1554 1555 1556 1557
	     rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
	    /* PM bit is only checked in frames where it isn't reserved,
	     * in AP mode it's reserved in non-bufferable management frames
	     * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
	     */
	    (!ieee80211_is_mgmt(hdr->frame_control) ||
	     ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
J
Johannes Berg 已提交
1558
		if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1559
			if (!ieee80211_has_pm(hdr->frame_control))
1560
				sta_ps_end(sta);
1561 1562
		} else {
			if (ieee80211_has_pm(hdr->frame_control))
1563
				sta_ps_start(sta);
1564
		}
1565 1566
	}

M
Marco Porsch 已提交
1567 1568 1569 1570
	/* mesh power save support */
	if (ieee80211_vif_is_mesh(&rx->sdata->vif))
		ieee80211_mps_rx_h_sta_process(sta, hdr);

1571 1572 1573 1574 1575 1576
	/*
	 * 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)) {
1577
		I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1578 1579 1580

		/*
		 * If we receive a 4-addr nullfunc frame from a STA
1581 1582 1583
		 * 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.
1584 1585 1586 1587
		 */
		if (ieee80211_has_a4(hdr->frame_control) &&
		    (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
		     (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1588 1589 1590 1591 1592
		      !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);
1593
			return RX_DROP_MONITOR;
1594
		}
1595 1596 1597 1598
		/*
		 * Update counter and free packet here to avoid
		 * counting this as a dropped packed.
		 */
1599
		sta->rx_stats.packets++;
1600
		dev_kfree_skb(rx->skb);
1601
		return RX_QUEUED;
1602 1603
	}

1604
	return RX_CONTINUE;
1605 1606
} /* ieee80211_rx_h_sta_process */

1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618
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;
1619
	const struct ieee80211_cipher_scheme *cs = NULL;
1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649

	/*
	 * 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.
	 */

	/* start without a key */
	rx->key = NULL;
1650
	fc = hdr->frame_control;
1651

1652 1653
	if (rx->sta) {
		int keyid = rx->sta->ptk_idx;
1654

1655 1656
		if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
			cs = rx->sta->cipher_scheme;
1657
			keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1658 1659 1660 1661 1662
			if (unlikely(keyid < 0))
				return RX_DROP_UNUSABLE;
		}
		sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
	}
1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683

	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 */
1684 1685 1686 1687 1688
		if (rx->sta) {
			if (ieee80211_is_group_privacy_action(skb) &&
			    test_sta_flag(rx->sta, WLAN_STA_MFP))
				return RX_DROP_MONITOR;

1689
			rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1690
		}
1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728
		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;
1729

1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744
		/*
		 * 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);

1745
		if (cs) {
1746
			keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1747

1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759
			if (unlikely(keyidx < 0))
				return RX_DROP_UNUSABLE;
		} else {
			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;
		}
1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799

		/* 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;

		/* 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:
J
Jouni Malinen 已提交
1800 1801 1802 1803 1804 1805
		result = ieee80211_crypto_ccmp_decrypt(
			rx, IEEE80211_CCMP_MIC_LEN);
		break;
	case WLAN_CIPHER_SUITE_CCMP_256:
		result = ieee80211_crypto_ccmp_decrypt(
			rx, IEEE80211_CCMP_256_MIC_LEN);
1806 1807 1808 1809
		break;
	case WLAN_CIPHER_SUITE_AES_CMAC:
		result = ieee80211_crypto_aes_cmac_decrypt(rx);
		break;
1810 1811 1812
	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
		result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
		break;
1813 1814 1815 1816
	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
		result = ieee80211_crypto_aes_gmac_decrypt(rx);
		break;
1817 1818 1819 1820
	case WLAN_CIPHER_SUITE_GCMP:
	case WLAN_CIPHER_SUITE_GCMP_256:
		result = ieee80211_crypto_gcmp_decrypt(rx);
		break;
1821
	default:
1822
		result = ieee80211_crypto_hw_decrypt(rx);
1823 1824 1825 1826 1827 1828 1829 1830 1831 1832
	}

	/* 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;
}

1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843
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
1844
	if (!skb_queue_empty(&entry->skb_list))
1845 1846 1847 1848 1849 1850 1851 1852
		__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;
1853
	entry->check_sequential_pn = false;
1854 1855 1856 1857 1858 1859 1860
	entry->extra_len = 0;

	return entry;
}

static inline struct ieee80211_fragment_entry *
ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1861
			  unsigned int frag, unsigned int seq,
1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880
			  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;

1881
		f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1882

1883 1884 1885 1886 1887
		/*
		 * Check ftype and addresses are equal, else check next fragment
		 */
		if (((hdr->frame_control ^ f_hdr->frame_control) &
		     cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1888 1889
		    !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
		    !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1890 1891
			continue;

1892
		if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1893 1894 1895 1896 1897 1898 1899 1900 1901
			__skb_queue_purge(&entry->skb_list);
			continue;
		}
		return entry;
	}

	return NULL;
}

1902
static ieee80211_rx_result debug_noinline
1903
ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1904 1905 1906
{
	struct ieee80211_hdr *hdr;
	u16 sc;
1907
	__le16 fc;
1908 1909 1910 1911
	unsigned int frag, seq;
	struct ieee80211_fragment_entry *entry;
	struct sk_buff *skb;

1912
	hdr = (struct ieee80211_hdr *)rx->skb->data;
1913
	fc = hdr->frame_control;
1914 1915 1916 1917

	if (ieee80211_is_ctl(fc))
		return RX_CONTINUE;

1918 1919 1920
	sc = le16_to_cpu(hdr->seq_ctrl);
	frag = sc & IEEE80211_SCTL_FRAG;

1921
	if (is_multicast_ether_addr(hdr->addr1)) {
1922
		I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1923
		goto out_no_led;
1924
	}
1925

1926 1927 1928
	if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
		goto out;

1929 1930
	I802_DEBUG_INC(rx->local->rx_handlers_fragments);

Z
Zhu Yi 已提交
1931 1932 1933
	if (skb_linearize(rx->skb))
		return RX_DROP_UNUSABLE;

1934 1935 1936 1937 1938 1939
	/*
	 *  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;
1940 1941 1942 1943 1944
	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,
1945
						 rx->seqno_idx, &(rx->skb));
J
Jouni Malinen 已提交
1946 1947
		if (rx->key &&
		    (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1948 1949 1950
		     rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
		     rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
		     rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
1951
		    ieee80211_has_protected(fc)) {
1952
			int queue = rx->security_idx;
1953 1954 1955 1956 1957

			/* Store CCMP/GCMP PN so that we can verify that the
			 * next fragment has a sequential PN value.
			 */
			entry->check_sequential_pn = true;
1958
			memcpy(entry->last_pn,
1959
			       rx->key->u.ccmp.rx_pn[queue],
1960
			       IEEE80211_CCMP_PN_LEN);
1961 1962 1963 1964 1965 1966 1967 1968
			BUILD_BUG_ON(offsetof(struct ieee80211_key,
					      u.ccmp.rx_pn) !=
				     offsetof(struct ieee80211_key,
					      u.gcmp.rx_pn));
			BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
				     sizeof(rx->key->u.gcmp.rx_pn[queue]));
			BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
				     IEEE80211_GCMP_PN_LEN);
1969
		}
1970
		return RX_QUEUED;
1971 1972 1973 1974 1975
	}

	/* 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.
	 */
1976 1977
	entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
					  rx->seqno_idx, hdr);
1978 1979
	if (!entry) {
		I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
J
Johannes Berg 已提交
1980
		return RX_DROP_MONITOR;
1981 1982
	}

1983 1984 1985 1986 1987 1988
	/* "The receiver shall discard MSDUs and MMPDUs whose constituent
	 *  MPDU PN values are not incrementing in steps of 1."
	 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
	 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
	 */
	if (entry->check_sequential_pn) {
1989
		int i;
1990
		u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1991
		int queue;
1992

J
Jouni Malinen 已提交
1993 1994
		if (!rx->key ||
		    (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1995 1996 1997
		     rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
		     rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
		     rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
J
Johannes Berg 已提交
1998
			return RX_DROP_UNUSABLE;
1999 2000
		memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
		for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2001 2002 2003 2004
			pn[i]++;
			if (pn[i])
				break;
		}
2005
		queue = rx->security_idx;
2006
		rpn = rx->key->u.ccmp.rx_pn[queue];
2007
		if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
J
Johannes Berg 已提交
2008
			return RX_DROP_UNUSABLE;
2009
		memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2010 2011
	}

2012
	skb_pull(rx->skb, ieee80211_hdrlen(fc));
2013 2014 2015
	__skb_queue_tail(&entry->skb_list, rx->skb);
	entry->last_frag = frag;
	entry->extra_len += rx->skb->len;
2016
	if (ieee80211_has_morefrags(fc)) {
2017
		rx->skb = NULL;
2018
		return RX_QUEUED;
2019 2020 2021 2022
	}

	rx->skb = __skb_dequeue(&entry->skb_list);
	if (skb_tailroom(rx->skb) < entry->extra_len) {
2023
		I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2024 2025 2026 2027
		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
2028
			return RX_DROP_UNUSABLE;
2029 2030 2031 2032 2033 2034 2035 2036
		}
	}
	while ((skb = __skb_dequeue(&entry->skb_list))) {
		memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
		dev_kfree_skb(skb);
	}

 out:
2037 2038
	ieee80211_led_rx(rx->local);
 out_no_led:
2039
	if (rx->sta)
2040
		rx->sta->rx_stats.packets++;
2041
	return RX_CONTINUE;
2042 2043
}

J
Johannes Berg 已提交
2044
static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2045
{
J
Johannes Berg 已提交
2046
	if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2047
		return -EACCES;
2048

2049
	return 0;
2050 2051
}

J
Johannes Berg 已提交
2052
static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2053
{
J
Johannes Berg 已提交
2054 2055 2056
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);

2057
	/*
2058 2059
	 * Pass through unencrypted frames if the hardware has
	 * decrypted them already.
2060
	 */
J
Johannes Berg 已提交
2061
	if (status->flag & RX_FLAG_DECRYPTED)
2062
		return 0;
2063 2064

	/* Drop unencrypted frames if key is set. */
2065 2066
	if (unlikely(!ieee80211_has_protected(fc) &&
		     !ieee80211_is_nullfunc(fc) &&
2067
		     ieee80211_is_data(fc) && rx->key))
2068
		return -EACCES;
2069 2070 2071 2072

	return 0;
}

J
Johannes Berg 已提交
2073
static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2074 2075
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2076
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2077 2078
	__le16 fc = hdr->frame_control;

2079 2080 2081 2082 2083 2084
	/*
	 * Pass through unencrypted frames if the hardware has
	 * decrypted them already.
	 */
	if (status->flag & RX_FLAG_DECRYPTED)
		return 0;
2085

J
Johannes Berg 已提交
2086
	if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2087 2088
		if (unlikely(!ieee80211_has_protected(fc) &&
			     ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2089
			     rx->key)) {
2090 2091 2092 2093 2094
			if (ieee80211_is_deauth(fc) ||
			    ieee80211_is_disassoc(fc))
				cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
							     rx->skb->data,
							     rx->skb->len);
2095
			return -EACCES;
2096
		}
2097
		/* BIP does not use Protected field, so need to check MMIE */
2098
		if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2099
			     ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2100 2101 2102 2103 2104
			if (ieee80211_is_deauth(fc) ||
			    ieee80211_is_disassoc(fc))
				cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
							     rx->skb->data,
							     rx->skb->len);
2105
			return -EACCES;
2106
		}
2107 2108 2109 2110 2111
		/*
		 * When using MFP, Action frames are not allowed prior to
		 * having configured keys.
		 */
		if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2112
			     ieee80211_is_robust_mgmt_frame(rx->skb)))
2113 2114
			return -EACCES;
	}
2115

2116
	return 0;
2117 2118
}

2119
static int
2120
__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2121
{
J
Johannes Berg 已提交
2122
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2123
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2124 2125 2126
	bool check_port_control = false;
	struct ethhdr *ehdr;
	int ret;
2127

2128
	*port_control = false;
2129 2130
	if (ieee80211_has_a4(hdr->frame_control) &&
	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2131
		return -1;
2132

2133 2134 2135 2136 2137 2138 2139 2140 2141
	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;
	}

2142
	if (is_multicast_ether_addr(hdr->addr1) &&
2143
	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2144
		return -1;
2145

2146
	ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2147
	if (ret < 0)
2148 2149 2150
		return ret;

	ehdr = (struct ethhdr *) rx->skb->data;
2151 2152 2153
	if (ehdr->h_proto == rx->sdata->control_port_protocol)
		*port_control = true;
	else if (check_port_control)
2154 2155 2156
		return -1;

	return 0;
2157
}
2158

2159 2160 2161
/*
 * requires that rx->skb is a frame with ethernet header
 */
2162
static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2163
{
2164
	static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2165 2166 2167 2168 2169 2170 2171
		= { 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.
	 */
2172
	if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2173 2174
	    (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
	     ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2175 2176 2177
		return true;

	if (ieee80211_802_1x_port_control(rx) ||
2178
	    ieee80211_drop_unencrypted(rx, fc))
2179 2180 2181 2182 2183 2184 2185 2186
		return false;

	return true;
}

/*
 * requires that rx->skb is a frame with ethernet header
 */
2187
static void
2188
ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2189
{
J
Johannes Berg 已提交
2190 2191
	struct ieee80211_sub_if_data *sdata = rx->sdata;
	struct net_device *dev = sdata->dev;
2192
	struct sk_buff *skb, *xmit_skb;
2193 2194
	struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
	struct sta_info *dsta;
2195

2196 2197
	skb = rx->skb;
	xmit_skb = NULL;
2198

2199 2200
	ieee80211_rx_stats(dev, skb->len);

2201 2202 2203 2204 2205 2206
	if (rx->sta) {
		/* The seqno index has the same property as needed
		 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
		 * for non-QoS-data frames. Here we know it's a data
		 * frame, so count MSDUs.
		 */
2207
		u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2208
		rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2209
		u64_stats_update_end(&rx->sta->rx_stats.syncp);
2210 2211
	}

2212 2213
	if ((sdata->vif.type == NL80211_IFTYPE_AP ||
	     sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2214
	    !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2215
	    (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2216 2217
		if (is_multicast_ether_addr(ehdr->h_dest) &&
		    ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2218 2219 2220 2221
			/*
			 * send multicast frames both to higher layers in
			 * local net stack and back to the wireless medium
			 */
2222
			xmit_skb = skb_copy(skb, GFP_ATOMIC);
2223
			if (!xmit_skb)
J
Johannes Berg 已提交
2224
				net_info_ratelimited("%s: failed to clone multicast frame\n",
2225
						    dev->name);
2226
		} else if (!is_multicast_ether_addr(ehdr->h_dest)) {
2227 2228
			dsta = sta_info_get(sdata, skb->data);
			if (dsta) {
2229 2230 2231 2232 2233
				/*
				 * 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.
2234
				 */
2235
				xmit_skb = skb;
2236 2237 2238 2239 2240
				skb = NULL;
			}
		}
	}

2241
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2242 2243 2244 2245 2246 2247
	if (skb) {
		/* '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 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 ether_addr_equal)
2248
		 */
2249 2250 2251
		int align;

		align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2252 2253 2254 2255 2256 2257
		if (align) {
			if (WARN_ON(skb_headroom(skb) < 3)) {
				dev_kfree_skb(skb);
				skb = NULL;
			} else {
				u8 *data = skb->data;
2258 2259 2260 2261
				size_t len = skb_headlen(skb);
				skb->data -= align;
				memmove(skb->data, data, len);
				skb_set_tail_pointer(skb, len);
2262 2263
			}
		}
2264
	}
2265 2266
#endif

2267 2268 2269 2270
	if (skb) {
		/* deliver to local stack */
		skb->protocol = eth_type_trans(skb, dev);
		memset(skb->cb, 0, sizeof(skb->cb));
2271 2272
		if (rx->napi)
			napi_gro_receive(rx->napi, skb);
J
Johannes Berg 已提交
2273 2274
		else
			netif_receive_skb(skb);
2275 2276
	}

2277
	if (xmit_skb) {
2278 2279 2280 2281 2282 2283
		/*
		 * 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;
2284
		xmit_skb->protocol = htons(ETH_P_802_3);
2285 2286
		skb_reset_network_header(xmit_skb);
		skb_reset_mac_header(xmit_skb);
2287
		dev_queue_xmit(xmit_skb);
2288
	}
2289 2290
}

2291
static ieee80211_rx_result debug_noinline
2292
ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2293
{
J
Johannes Berg 已提交
2294
	struct net_device *dev = rx->sdata->dev;
Z
Zhu Yi 已提交
2295
	struct sk_buff *skb = rx->skb;
2296 2297
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	__le16 fc = hdr->frame_control;
Z
Zhu Yi 已提交
2298
	struct sk_buff_head frame_list;
2299
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2300
	struct ethhdr ethhdr;
2301
	const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2302

2303
	if (unlikely(!ieee80211_is_data(fc)))
2304
		return RX_CONTINUE;
2305

2306
	if (unlikely(!ieee80211_is_data_present(fc)))
J
Johannes Berg 已提交
2307
		return RX_DROP_MONITOR;
2308

2309
	if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2310
		return RX_CONTINUE;
2311

2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324
	if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
		switch (rx->sdata->vif.type) {
		case NL80211_IFTYPE_AP_VLAN:
			if (!rx->sdata->u.vlan.sta)
				return RX_DROP_UNUSABLE;
			break;
		case NL80211_IFTYPE_STATION:
			if (!rx->sdata->u.mgd.use_4addr)
				return RX_DROP_UNUSABLE;
			break;
		default:
			return RX_DROP_UNUSABLE;
		}
2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341
		check_da = NULL;
		check_sa = NULL;
	} else switch (rx->sdata->vif.type) {
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_AP_VLAN:
			check_da = NULL;
			break;
		case NL80211_IFTYPE_STATION:
			if (!rx->sta ||
			    !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
				check_sa = NULL;
			break;
		case NL80211_IFTYPE_MESH_POINT:
			check_sa = NULL;
			break;
		default:
			break;
2342
	}
2343

2344
	if (is_multicast_ether_addr(hdr->addr1))
J
Johannes Berg 已提交
2345
		return RX_DROP_UNUSABLE;
2346

Z
Zhu Yi 已提交
2347 2348
	skb->dev = dev;
	__skb_queue_head_init(&frame_list);
2349

2350 2351 2352 2353 2354
	if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
					  rx->sdata->vif.addr,
					  rx->sdata->vif.type))
		return RX_DROP_UNUSABLE;

Z
Zhu Yi 已提交
2355 2356
	ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
				 rx->sdata->vif.type,
2357
				 rx->local->hw.extra_tx_headroom,
2358
				 check_da, check_sa);
2359

Z
Zhu Yi 已提交
2360 2361
	while (!skb_queue_empty(&frame_list)) {
		rx->skb = __skb_dequeue(&frame_list);
2362

2363
		if (!ieee80211_frame_allowed(rx, fc)) {
Z
Zhu Yi 已提交
2364
			dev_kfree_skb(rx->skb);
2365 2366
			continue;
		}
2367 2368 2369 2370

		ieee80211_deliver_skb(rx);
	}

2371
	return RX_QUEUED;
2372 2373
}

I
Ingo Molnar 已提交
2374
#ifdef CONFIG_MAC80211_MESH
2375
static ieee80211_rx_result
2376 2377
ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
{
2378 2379
	struct ieee80211_hdr *fwd_hdr, *hdr;
	struct ieee80211_tx_info *info;
2380 2381
	struct ieee80211s_hdr *mesh_hdr;
	struct sk_buff *skb = rx->skb, *fwd_skb;
J
Johannes Berg 已提交
2382
	struct ieee80211_local *local = rx->local;
J
Johannes Berg 已提交
2383
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2384
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2385
	u16 ac, q, hdrlen;
2386 2387 2388

	hdr = (struct ieee80211_hdr *) skb->data;
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402

	/* 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;
2403 2404
	mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);

2405 2406 2407
	if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
		return RX_DROP_MONITOR;

2408 2409 2410
	/* 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
2411
	    mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2412 2413
		return RX_DROP_MONITOR;

2414
	if (!ieee80211_is_data(hdr->frame_control))
2415 2416 2417 2418 2419
		return RX_CONTINUE;

	if (!mesh_hdr->ttl)
		return RX_DROP_MONITOR;

2420
	if (mesh_hdr->flags & MESH_FLAGS_AE) {
2421
		struct mesh_path *mppath;
2422 2423 2424 2425 2426 2427
		char *proxied_addr;
		char *mpp_addr;

		if (is_multicast_ether_addr(hdr->addr1)) {
			mpp_addr = hdr->addr3;
			proxied_addr = mesh_hdr->eaddr1;
2428 2429
		} else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
			/* has_a4 already checked in ieee80211_rx_mesh_check */
2430 2431
			mpp_addr = hdr->addr4;
			proxied_addr = mesh_hdr->eaddr2;
2432 2433
		} else {
			return RX_DROP_MONITOR;
2434
		}
2435 2436

		rcu_read_lock();
J
Johannes Berg 已提交
2437
		mppath = mpp_path_lookup(sdata, proxied_addr);
2438
		if (!mppath) {
J
Johannes Berg 已提交
2439
			mpp_path_add(sdata, proxied_addr, mpp_addr);
2440 2441
		} else {
			spin_lock_bh(&mppath->state_lock);
2442
			if (!ether_addr_equal(mppath->mpp, mpp_addr))
2443
				memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2444
			mppath->exp_time = jiffies;
2445 2446 2447 2448 2449
			spin_unlock_bh(&mppath->state_lock);
		}
		rcu_read_unlock();
	}

2450 2451
	/* Frame has reached destination.  Don't forward */
	if (!is_multicast_ether_addr(hdr->addr1) &&
2452
	    ether_addr_equal(sdata->vif.addr, hdr->addr3))
2453 2454
		return RX_CONTINUE;

2455 2456
	ac = ieee80211_select_queue_80211(sdata, skb, hdr);
	q = sdata->vif.hw_queue[ac];
2457
	if (ieee80211_queue_stopped(&local->hw, q)) {
2458
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2459 2460 2461
		return RX_DROP_MONITOR;
	}
	skb_set_queue_mapping(skb, q);
2462

2463 2464
	if (!--mesh_hdr->ttl) {
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2465
		goto out;
2466 2467
	}

2468 2469 2470
	if (!ifmsh->mshcfg.dot11MeshForwarding)
		goto out;

2471 2472
	fwd_skb = skb_copy_expand(skb, local->tx_headroom +
				       sdata->encrypt_headroom, 0, GFP_ATOMIC);
2473
	if (!fwd_skb) {
J
Johannes Berg 已提交
2474
		net_info_ratelimited("%s: failed to clone mesh frame\n",
2475
				    sdata->name);
2476 2477 2478 2479
		goto out;
	}

	fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2480
	fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2481 2482 2483 2484 2485 2486 2487 2488
	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
2489 2490
		/* update power mode indication when forwarding */
		ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
J
Johannes Berg 已提交
2491
	} else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
M
Marco Porsch 已提交
2492
		/* mesh power mode flags updated in mesh_nexthop_lookup */
2493 2494 2495
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
	} else {
		/* unable to resolve next hop */
J
Johannes Berg 已提交
2496
		mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2497 2498 2499
				   fwd_hdr->addr3, 0,
				   WLAN_REASON_MESH_PATH_NOFORWARD,
				   fwd_hdr->addr2);
2500
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2501
		kfree_skb(fwd_skb);
2502
		return RX_DROP_MONITOR;
2503 2504
	}

2505 2506
	IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
	ieee80211_add_pending_skb(local, fwd_skb);
J
Johannes Berg 已提交
2507
 out:
2508
	if (is_multicast_ether_addr(hdr->addr1))
2509
		return RX_CONTINUE;
2510
	return RX_DROP_MONITOR;
2511
}
I
Ingo Molnar 已提交
2512
#endif
2513

2514
static ieee80211_rx_result debug_noinline
2515
ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2516
{
J
Johannes Berg 已提交
2517
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2518
	struct ieee80211_local *local = rx->local;
J
Johannes Berg 已提交
2519
	struct net_device *dev = sdata->dev;
2520 2521
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
	__le16 fc = hdr->frame_control;
2522
	bool port_control;
2523
	int err;
2524

2525
	if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2526
		return RX_CONTINUE;
2527

2528
	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
J
Johannes Berg 已提交
2529
		return RX_DROP_MONITOR;
2530

2531
	/*
2532 2533
	 * Send unexpected-4addr-frame event to hostapd. For older versions,
	 * also drop the frame to cooked monitor interfaces.
2534 2535
	 */
	if (ieee80211_has_a4(hdr->frame_control) &&
2536 2537 2538 2539 2540
	    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);
2541
		return RX_DROP_MONITOR;
2542
	}
2543

2544
	err = __ieee80211_data_to_8023(rx, &port_control);
2545
	if (unlikely(err))
J
Johannes Berg 已提交
2546
		return RX_DROP_UNUSABLE;
2547

2548
	if (!ieee80211_frame_allowed(rx, fc))
J
Johannes Berg 已提交
2549
		return RX_DROP_MONITOR;
2550

2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561
	/* directly handle TDLS channel switch requests/responses */
	if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
						cpu_to_be16(ETH_P_TDLS))) {
		struct ieee80211_tdls_data *tf = (void *)rx->skb->data;

		if (pskb_may_pull(rx->skb,
				  offsetof(struct ieee80211_tdls_data, u)) &&
		    tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
		    tf->category == WLAN_CATEGORY_TDLS &&
		    (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
		     tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2562 2563
			skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
			schedule_work(&local->tdls_chsw_work);
2564
			if (rx->sta)
2565
				rx->sta->rx_stats.packets++;
2566 2567 2568 2569 2570

			return RX_QUEUED;
		}
	}

2571 2572 2573 2574 2575 2576 2577 2578
	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;
	}

2579 2580
	rx->skb->dev = dev;

2581 2582
	if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
	    local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2583 2584 2585
	    !is_multicast_ether_addr(
		    ((struct ethhdr *)rx->skb->data)->h_dest) &&
	    (!local->scanning &&
2586 2587 2588
	     !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
		mod_timer(&local->dynamic_ps_timer, jiffies +
			  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2589

2590
	ieee80211_deliver_skb(rx);
2591

2592
	return RX_QUEUED;
2593 2594
}

2595
static ieee80211_rx_result debug_noinline
2596
ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2597 2598
{
	struct sk_buff *skb = rx->skb;
2599
	struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2600 2601 2602 2603
	struct tid_ampdu_rx *tid_agg_rx;
	u16 start_seq_num;
	u16 tid;

2604
	if (likely(!ieee80211_is_ctl(bar->frame_control)))
2605
		return RX_CONTINUE;
2606

2607
	if (ieee80211_is_back_req(bar->frame_control)) {
2608 2609 2610
		struct {
			__le16 control, start_seq_num;
		} __packed bar_data;
2611 2612 2613
		struct ieee80211_event event = {
			.type = BAR_RX_EVENT,
		};
2614

2615
		if (!rx->sta)
2616
			return RX_DROP_MONITOR;
2617 2618 2619 2620 2621 2622

		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;
2623

2624 2625 2626 2627 2628 2629
		if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
		    !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
			ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
					     WLAN_BACK_RECIPIENT,
					     WLAN_REASON_QSTA_REQUIRE_SETUP);

2630 2631
		tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
		if (!tid_agg_rx)
2632
			return RX_DROP_MONITOR;
2633

2634
		start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2635 2636 2637
		event.u.ba.tid = tid;
		event.u.ba.ssn = start_seq_num;
		event.u.ba.sta = &rx->sta->sta;
2638 2639

		/* reset session timer */
2640 2641 2642
		if (tid_agg_rx->timeout)
			mod_timer(&tid_agg_rx->session_timer,
				  TU_TO_EXP_TIME(tid_agg_rx->timeout));
2643

2644
		spin_lock(&tid_agg_rx->reorder_lock);
2645
		/* release stored frames up to start of BAR */
2646
		ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2647
						 start_seq_num, frames);
2648 2649
		spin_unlock(&tid_agg_rx->reorder_lock);

2650 2651
		drv_event_callback(rx->local, rx->sdata, &event);

2652 2653
		kfree_skb(skb);
		return RX_QUEUED;
2654 2655
	}

2656 2657 2658 2659 2660 2661
	/*
	 * After this point, we only want management frames,
	 * so we can drop all remaining control frames to
	 * cooked monitor interfaces.
	 */
	return RX_DROP_MONITOR;
2662 2663
}

2664 2665 2666
static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
					   struct ieee80211_mgmt *mgmt,
					   size_t len)
2667 2668 2669 2670 2671
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *resp;

2672
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2673 2674 2675 2676
		/* Not to own unicast address */
		return;
	}

2677 2678
	if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
	    !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2679
		/* Not from the current AP or not associated yet. */
2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695
		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);
2696
	memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2697
	memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2698 2699 2700 2701 2702 2703 2704 2705 2706
	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);

2707
	ieee80211_tx_skb(sdata, skb);
2708 2709
}

2710 2711 2712 2713
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;
2714
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726

	/*
	 * 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
2727 2728 2729
	if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
	    ieee80211_is_beacon(mgmt->frame_control) &&
	    !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2730 2731
		int sig = 0;

2732
		if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2733 2734
			sig = status->signal;

J
Johannes Berg 已提交
2735 2736
		cfg80211_report_obss_beacon(rx->local->hw.wiphy,
					    rx->skb->data, rx->skb->len,
2737
					    status->freq, sig);
J
Johannes Berg 已提交
2738 2739 2740
		rx->flags |= IEEE80211_RX_BEACON_REPORTED;
	}

2741 2742 2743 2744 2745 2746
	if (ieee80211_drop_unencrypted_mgmt(rx))
		return RX_DROP_UNUSABLE;

	return RX_CONTINUE;
}

2747 2748 2749 2750
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
2751
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2752
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2753
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2754 2755 2756 2757 2758
	int len = rx->skb->len;

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

2759 2760
	/* drop too small frames */
	if (len < IEEE80211_MIN_ACTION_SIZE)
2761
		return RX_DROP_UNUSABLE;
2762

2763
	if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2764 2765
	    mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
	    mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2766
		return RX_DROP_UNUSABLE;
2767 2768

	switch (mgmt->u.action.category) {
2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780
	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;

2781
		/* verify action & smps_control/chanwidth are present */
2782 2783 2784 2785 2786 2787
		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;
2788
			enum ieee80211_smps_mode smps_mode;
2789 2790 2791 2792

			/* convert to HT capability */
			switch (mgmt->u.action.u.ht_smps.smps_control) {
			case WLAN_HT_SMPS_CONTROL_DISABLED:
2793
				smps_mode = IEEE80211_SMPS_OFF;
2794 2795
				break;
			case WLAN_HT_SMPS_CONTROL_STATIC:
2796
				smps_mode = IEEE80211_SMPS_STATIC;
2797 2798
				break;
			case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2799
				smps_mode = IEEE80211_SMPS_DYNAMIC;
2800 2801 2802 2803 2804 2805
				break;
			default:
				goto invalid;
			}

			/* if no change do nothing */
2806
			if (rx->sta->sta.smps_mode == smps_mode)
2807
				goto handled;
2808
			rx->sta->sta.smps_mode = smps_mode;
2809 2810 2811

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

2812 2813
			rate_control_rate_update(local, sband, rx->sta,
						 IEEE80211_RC_SMPS_CHANGED);
2814 2815
			goto handled;
		}
2816 2817 2818
		case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
			struct ieee80211_supported_band *sband;
			u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2819
			enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2820 2821

			/* If it doesn't support 40 MHz it can't change ... */
2822 2823
			if (!(rx->sta->sta.ht_cap.cap &
					IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2824 2825
				goto handled;

2826
			if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2827
				max_bw = IEEE80211_STA_RX_BW_20;
2828
			else
2829 2830 2831 2832 2833
				max_bw = ieee80211_sta_cap_rx_bw(rx->sta);

			/* set cur_max_bandwidth and recalc sta bw */
			rx->sta->cur_max_bandwidth = max_bw;
			new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2834

2835
			if (rx->sta->sta.bandwidth == new_bw)
2836 2837
				goto handled;

2838
			rx->sta->sta.bandwidth = new_bw;
2839 2840 2841 2842 2843 2844
			sband = rx->local->hw.wiphy->bands[status->band];

			rate_control_rate_update(local, sband, rx->sta,
						 IEEE80211_RC_BW_CHANGED);
			goto handled;
		}
2845 2846 2847 2848
		default:
			goto invalid;
		}

2849
		break;
2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865
	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;
2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882
	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: {
			/* verify opmode is present */
			if (len < IEEE80211_MIN_ACTION_SIZE + 2)
				goto invalid;
2883
			goto queue;
2884
		}
2885 2886 2887 2888 2889
		case WLAN_VHT_ACTION_GROUPID_MGMT: {
			if (len < IEEE80211_MIN_ACTION_SIZE + 25)
				goto invalid;
			goto queue;
		}
2890 2891 2892
		default:
			break;
		}
2893
		break;
2894
	case WLAN_CATEGORY_BACK:
2895
		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2896
		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2897
		    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2898 2899
		    sdata->vif.type != NL80211_IFTYPE_AP &&
		    sdata->vif.type != NL80211_IFTYPE_ADHOC)
2900
			break;
2901

2902 2903 2904 2905
		/* verify action_code is present */
		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
			break;

2906 2907 2908 2909
		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)))
2910 2911
				goto invalid;
			break;
2912 2913 2914
		case WLAN_ACTION_ADDBA_RESP:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.addba_resp)))
2915 2916
				goto invalid;
			break;
2917 2918 2919
		case WLAN_ACTION_DELBA:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.delba)))
2920 2921 2922 2923
				goto invalid;
			break;
		default:
			goto invalid;
2924
		}
2925

2926
		goto queue;
2927
	case WLAN_CATEGORY_SPECTRUM_MGMT:
2928 2929 2930 2931
		/* verify action_code is present */
		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
			break;

2932 2933
		switch (mgmt->u.action.u.measurement.action_code) {
		case WLAN_ACTION_SPCT_MSR_REQ:
2934
			if (status->band != NL80211_BAND_5GHZ)
2935 2936
				break;

2937 2938
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.measurement)))
2939
				break;
2940 2941 2942 2943

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

2944
			ieee80211_process_measurement_req(sdata, mgmt, len);
2945
			goto handled;
2946 2947 2948 2949
		case WLAN_ACTION_SPCT_CHL_SWITCH: {
			u8 *bssid;
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.chan_switch)))
2950
				break;
2951

2952
			if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2953 2954
			    sdata->vif.type != NL80211_IFTYPE_ADHOC &&
			    sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2955 2956 2957 2958 2959 2960
				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;
2961 2962
			else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
				bssid = mgmt->sa;
2963 2964 2965 2966
			else
				break;

			if (!ether_addr_equal(mgmt->bssid, bssid))
2967
				break;
S
Sujith 已提交
2968

2969
			goto queue;
2970
			}
2971 2972
		}
		break;
2973 2974 2975
	case WLAN_CATEGORY_SA_QUERY:
		if (len < (IEEE80211_MIN_ACTION_SIZE +
			   sizeof(mgmt->u.action.u.sa_query)))
2976 2977
			break;

2978 2979 2980
		switch (mgmt->u.action.u.sa_query.action) {
		case WLAN_ACTION_SA_QUERY_REQUEST:
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
2981
				break;
2982
			ieee80211_process_sa_query_req(sdata, mgmt, len);
2983
			goto handled;
2984 2985
		}
		break;
2986
	case WLAN_CATEGORY_SELF_PROTECTED:
2987 2988 2989 2990
		if (len < (IEEE80211_MIN_ACTION_SIZE +
			   sizeof(mgmt->u.action.u.self_prot.action_code)))
			break;

2991 2992 2993 2994 2995 2996
		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;
2997
			if (sdata->u.mesh.user_mpm)
2998 2999 3000 3001 3002 3003 3004 3005 3006 3007
				/* 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;
3008
	case WLAN_CATEGORY_MESH_ACTION:
3009 3010 3011 3012
		if (len < (IEEE80211_MIN_ACTION_SIZE +
			   sizeof(mgmt->u.action.u.mesh_action.action_code)))
			break;

3013 3014
		if (!ieee80211_vif_is_mesh(&sdata->vif))
			break;
3015
		if (mesh_action_is_path_sel(mgmt) &&
J
Johannes Berg 已提交
3016
		    !mesh_path_sel_is_hwmp(sdata))
3017 3018
			break;
		goto queue;
3019
	}
3020

3021 3022
	return RX_CONTINUE;

3023
 invalid:
3024
	status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3025 3026 3027 3028 3029
	/* will return in the next handlers */
	return RX_CONTINUE;

 handled:
	if (rx->sta)
3030
		rx->sta->rx_stats.packets++;
3031 3032 3033 3034 3035 3036 3037 3038
	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)
3039
		rx->sta->rx_stats.packets++;
3040 3041 3042 3043 3044 3045
	return RX_QUEUED;
}

static ieee80211_rx_result debug_noinline
ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
{
3046
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3047
	int sig = 0;
3048 3049

	/* skip known-bad action frames and return them in the next handler */
3050
	if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3051
		return RX_CONTINUE;
3052

3053 3054 3055 3056 3057 3058 3059
	/*
	 * 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.
	 */

3060
	if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
3061 3062
		sig = status->signal;

3063
	if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3064
			     rx->skb->data, rx->skb->len, 0)) {
3065
		if (rx->sta)
3066
			rx->sta->rx_stats.packets++;
3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080
		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;
3081
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3082 3083 3084 3085 3086 3087 3088 3089 3090

	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
3091
	 * 802.11-2012 9.24.4.
3092 3093 3094 3095
	 * 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.
	 */
3096
	if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3097 3098 3099
	    (sdata->vif.type == NL80211_IFTYPE_AP ||
	     sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
		return RX_DROP_MONITOR;
3100

3101 3102 3103
	if (is_multicast_ether_addr(mgmt->da))
		return RX_DROP_MONITOR;

3104 3105 3106 3107 3108 3109 3110
	/* 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) {
3111
		struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3112

3113 3114 3115
		nmgmt->u.action.category |= 0x80;
		memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
		memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3116 3117 3118

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

3119 3120 3121 3122 3123 3124
		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;
3125
			if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3126 3127 3128 3129 3130 3131
				info->hw_queue =
					local->hw.offchannel_tx_hw_queue;
		}

		__ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
					    status->band);
3132
	}
3133 3134
	dev_kfree_skb(rx->skb);
	return RX_QUEUED;
3135 3136
}

3137
static ieee80211_rx_result debug_noinline
3138
ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3139
{
J
Johannes Berg 已提交
3140
	struct ieee80211_sub_if_data *sdata = rx->sdata;
3141 3142
	struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
	__le16 stype;
3143

3144
	stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3145

3146 3147
	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
	    sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3148
	    sdata->vif.type != NL80211_IFTYPE_OCB &&
3149 3150
	    sdata->vif.type != NL80211_IFTYPE_STATION)
		return RX_DROP_MONITOR;
3151

3152
	switch (stype) {
J
Johannes Berg 已提交
3153
	case cpu_to_le16(IEEE80211_STYPE_AUTH):
3154 3155 3156 3157
	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
3158 3159
	case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
	case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3160 3161
	case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
	case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3162 3163 3164 3165
		if (is_multicast_ether_addr(mgmt->da) &&
		    !is_broadcast_ether_addr(mgmt->da))
			return RX_DROP_MONITOR;

3166 3167 3168 3169 3170
		/* process only for station */
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			return RX_DROP_MONITOR;
		break;
	case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3171 3172 3173
		/* process only for ibss and mesh */
		if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3174 3175 3176 3177 3178
			return RX_DROP_MONITOR;
		break;
	default:
		return RX_DROP_MONITOR;
	}
3179

3180
	/* queue up frame and kick off work to process it */
3181
	rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3182 3183
	skb_queue_tail(&sdata->skb_queue, rx->skb);
	ieee80211_queue_work(&rx->local->hw, &sdata->work);
3184
	if (rx->sta)
3185
		rx->sta->rx_stats.packets++;
3186

3187
	return RX_QUEUED;
3188 3189
}

J
Johannes Berg 已提交
3190 3191
static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
					struct ieee80211_rate *rate)
3192 3193 3194 3195 3196
{
	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
3197
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3198
	int needed_headroom;
3199

3200 3201 3202 3203 3204
	/*
	 * If cooked monitor has been processed already, then
	 * don't do it again. If not, set the flag.
	 */
	if (rx->flags & IEEE80211_RX_CMNTR)
3205
		goto out_free_skb;
3206
	rx->flags |= IEEE80211_RX_CMNTR;
3207

3208 3209 3210 3211
	/* If there are no cooked monitor interfaces, just free the SKB */
	if (!local->cooked_mntrs)
		goto out_free_skb;

3212 3213
	/* vendor data is long removed here */
	status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3214
	/* room for the radiotap header based on driver features */
3215
	needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3216

3217 3218 3219
	if (skb_headroom(skb) < needed_headroom &&
	    pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
		goto out_free_skb;
3220

3221
	/* prepend radiotap information */
3222 3223
	ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
					 false);
3224

3225
	skb_reset_mac_header(skb);
3226 3227 3228 3229 3230
	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) {
3231
		if (!ieee80211_sdata_running(sdata))
3232 3233
			continue;

3234
		if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3235
		    !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3236 3237 3238 3239 3240 3241
			continue;

		if (prev_dev) {
			skb2 = skb_clone(skb, GFP_ATOMIC);
			if (skb2) {
				skb2->dev = prev_dev;
3242
				netif_receive_skb(skb2);
3243 3244 3245 3246
			}
		}

		prev_dev = sdata->dev;
3247
		ieee80211_rx_stats(sdata->dev, skb->len);
3248 3249 3250 3251
	}

	if (prev_dev) {
		skb->dev = prev_dev;
3252
		netif_receive_skb(skb);
3253 3254
		return;
	}
3255 3256 3257 3258 3259

 out_free_skb:
	dev_kfree_skb(skb);
}

3260 3261 3262 3263 3264 3265 3266
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)
3267
			rx->sta->rx_stats.dropped++;
3268 3269 3270 3271 3272 3273 3274 3275 3276
		/* 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];
3277 3278
		if (!(status->flag & RX_FLAG_HT) &&
		    !(status->flag & RX_FLAG_VHT))
3279 3280 3281 3282 3283 3284 3285 3286
			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)
3287
			rx->sta->rx_stats.dropped++;
3288 3289 3290 3291 3292 3293 3294
		dev_kfree_skb(rx->skb);
		break;
	case RX_QUEUED:
		I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
		break;
	}
}
3295

3296 3297
static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
				  struct sk_buff_head *frames)
3298 3299
{
	ieee80211_rx_result res = RX_DROP_MONITOR;
3300
	struct sk_buff *skb;
3301

3302 3303 3304 3305
#define CALL_RXH(rxh)			\
	do {				\
		res = rxh(rx);		\
		if (res != RX_CONTINUE)	\
3306
			goto rxh_next;  \
3307
	} while (0)
3308

3309 3310 3311 3312 3313 3314
	/* Lock here to avoid hitting all of the data used in the RX
	 * path (e.g. key data, station data, ...) concurrently when
	 * a frame is released from the reorder buffer due to timeout
	 * from the timer, potentially concurrently with RX from the
	 * driver.
	 */
3315
	spin_lock_bh(&rx->local->rx_path_lock);
3316

3317
	while ((skb = __skb_dequeue(frames))) {
3318 3319 3320 3321 3322 3323 3324
		/*
		 * 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;

3325 3326 3327 3328 3329 3330
		CALL_RXH(ieee80211_rx_h_check_more_data);
		CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
		CALL_RXH(ieee80211_rx_h_sta_process);
		CALL_RXH(ieee80211_rx_h_decrypt);
		CALL_RXH(ieee80211_rx_h_defragment);
		CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3331
		/* must be after MMIC verify so header is counted in MPDU mic */
I
Ingo Molnar 已提交
3332
#ifdef CONFIG_MAC80211_MESH
3333
		if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3334
			CALL_RXH(ieee80211_rx_h_mesh_fwding);
I
Ingo Molnar 已提交
3335
#endif
3336 3337
		CALL_RXH(ieee80211_rx_h_amsdu);
		CALL_RXH(ieee80211_rx_h_data);
3338 3339 3340 3341 3342 3343

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

3344 3345 3346 3347 3348
		CALL_RXH(ieee80211_rx_h_mgmt_check);
		CALL_RXH(ieee80211_rx_h_action);
		CALL_RXH(ieee80211_rx_h_userspace_mgmt);
		CALL_RXH(ieee80211_rx_h_action_return);
		CALL_RXH(ieee80211_rx_h_mgmt);
3349

3350 3351
 rxh_next:
		ieee80211_rx_handlers_result(rx, res);
3352

3353
#undef CALL_RXH
3354
	}
3355

3356
	spin_unlock_bh(&rx->local->rx_path_lock);
3357 3358
}

3359
static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3360
{
3361
	struct sk_buff_head reorder_release;
3362 3363
	ieee80211_rx_result res = RX_DROP_MONITOR;

3364 3365
	__skb_queue_head_init(&reorder_release);

3366 3367 3368 3369 3370
#define CALL_RXH(rxh)			\
	do {				\
		res = rxh(rx);		\
		if (res != RX_CONTINUE)	\
			goto rxh_next;  \
3371
	} while (0)
3372

3373 3374
	CALL_RXH(ieee80211_rx_h_check_dup);
	CALL_RXH(ieee80211_rx_h_check);
3375

3376
	ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3377

3378
	ieee80211_rx_handlers(rx, &reorder_release);
3379
	return;
3380

3381
 rxh_next:
3382 3383 3384
	ieee80211_rx_handlers_result(rx, res);

#undef CALL_RXH
3385 3386
}

3387
/*
3388 3389
 * This function makes calls into the RX path, therefore
 * it has to be invoked under RCU read lock.
3390 3391 3392
 */
void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
{
3393
	struct sk_buff_head frames;
3394 3395 3396 3397
	struct ieee80211_rx_data rx = {
		.sta = sta,
		.sdata = sta->sdata,
		.local = sta->local,
3398 3399 3400
		/* This is OK -- must be QoS data frame */
		.security_idx = tid,
		.seqno_idx = tid,
3401
		.napi = NULL, /* must be NULL to not have races */
3402
	};
3403 3404 3405 3406 3407
	struct tid_ampdu_rx *tid_agg_rx;

	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
	if (!tid_agg_rx)
		return;
3408

3409 3410
	__skb_queue_head_init(&frames);

3411
	spin_lock(&tid_agg_rx->reorder_lock);
3412
	ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3413
	spin_unlock(&tid_agg_rx->reorder_lock);
3414

3415 3416 3417 3418 3419 3420 3421 3422 3423
	if (!skb_queue_empty(&frames)) {
		struct ieee80211_event event = {
			.type = BA_FRAME_TIMEOUT,
			.u.ba.tid = tid,
			.u.ba.sta = &sta->sta,
		};
		drv_event_callback(rx.local, rx.sdata, &event);
	}

3424
	ieee80211_rx_handlers(&rx, &frames);
3425 3426
}

3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505
void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
					  u16 ssn, u64 filtered,
					  u16 received_mpdus)
{
	struct sta_info *sta;
	struct tid_ampdu_rx *tid_agg_rx;
	struct sk_buff_head frames;
	struct ieee80211_rx_data rx = {
		/* This is OK -- must be QoS data frame */
		.security_idx = tid,
		.seqno_idx = tid,
	};
	int i, diff;

	if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
		return;

	__skb_queue_head_init(&frames);

	sta = container_of(pubsta, struct sta_info, sta);

	rx.sta = sta;
	rx.sdata = sta->sdata;
	rx.local = sta->local;

	rcu_read_lock();
	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
	if (!tid_agg_rx)
		goto out;

	spin_lock_bh(&tid_agg_rx->reorder_lock);

	if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
		int release;

		/* release all frames in the reorder buffer */
		release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
			   IEEE80211_SN_MODULO;
		ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
						 release, &frames);
		/* update ssn to match received ssn */
		tid_agg_rx->head_seq_num = ssn;
	} else {
		ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
						 &frames);
	}

	/* handle the case that received ssn is behind the mac ssn.
	 * it can be tid_agg_rx->buf_size behind and still be valid */
	diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
	if (diff >= tid_agg_rx->buf_size) {
		tid_agg_rx->reorder_buf_filtered = 0;
		goto release;
	}
	filtered = filtered >> diff;
	ssn += diff;

	/* update bitmap */
	for (i = 0; i < tid_agg_rx->buf_size; i++) {
		int index = (ssn + i) % tid_agg_rx->buf_size;

		tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
		if (filtered & BIT_ULL(i))
			tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
	}

	/* now process also frames that the filter marking released */
	ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);

release:
	spin_unlock_bh(&tid_agg_rx->reorder_lock);

	ieee80211_rx_handlers(&rx, &frames);

 out:
	rcu_read_unlock();
}
EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);

3506 3507
/* main receive path */

3508
static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3509
{
3510
	struct ieee80211_sub_if_data *sdata = rx->sdata;
J
Johannes Berg 已提交
3511
	struct sk_buff *skb = rx->skb;
3512
	struct ieee80211_hdr *hdr = (void *)skb->data;
J
Johannes Berg 已提交
3513 3514
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3515 3516
	int multicast = is_multicast_ether_addr(hdr->addr1);

3517
	switch (sdata->vif.type) {
3518
	case NL80211_IFTYPE_STATION:
3519
		if (!bssid && !sdata->u.mgd.use_4addr)
3520
			return false;
3521 3522 3523
		if (multicast)
			return true;
		return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3524
	case NL80211_IFTYPE_ADHOC:
3525
		if (!bssid)
3526
			return false;
3527 3528
		if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
		    ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3529
			return false;
3530
		if (ieee80211_is_beacon(hdr->frame_control))
3531
			return true;
3532
		if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3533
			return false;
3534 3535
		if (!multicast &&
		    !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3536
			return false;
3537
		if (!rx->sta) {
3538
			int rate_idx;
3539 3540
			if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
				rate_idx = 0; /* TODO: HT/VHT rates */
3541
			else
J
Johannes Berg 已提交
3542
				rate_idx = status->rate_idx;
3543 3544
			ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
						 BIT(rate_idx));
3545
		}
3546
		return true;
3547 3548 3549
	case NL80211_IFTYPE_OCB:
		if (!bssid)
			return false;
3550
		if (!ieee80211_is_data_present(hdr->frame_control))
3551
			return false;
3552
		if (!is_broadcast_ether_addr(bssid))
3553
			return false;
3554 3555
		if (!multicast &&
		    !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3556
			return false;
3557
		if (!rx->sta) {
3558 3559 3560 3561 3562 3563 3564 3565
			int rate_idx;
			if (status->flag & RX_FLAG_HT)
				rate_idx = 0; /* TODO: HT rates */
			else
				rate_idx = status->rate_idx;
			ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
						BIT(rate_idx));
		}
3566
		return true;
3567
	case NL80211_IFTYPE_MESH_POINT:
3568 3569 3570
		if (multicast)
			return true;
		return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3571 3572
	case NL80211_IFTYPE_AP_VLAN:
	case NL80211_IFTYPE_AP:
3573 3574 3575 3576
		if (!bssid)
			return ether_addr_equal(sdata->vif.addr, hdr->addr1);

		if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3577 3578 3579 3580 3581 3582
			/*
			 * 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.
			 */
3583 3584
			if (!multicast &&
			    !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3585
				return false;
J
Johannes Berg 已提交
3586
			if (ieee80211_is_public_action(hdr, skb->len))
3587
				return true;
3588
			return ieee80211_is_beacon(hdr->frame_control);
3589 3590 3591
		}

		if (!ieee80211_has_tods(hdr->frame_control)) {
3592 3593 3594 3595 3596
			/* ignore data frames to TDLS-peers */
			if (ieee80211_is_data(hdr->frame_control))
				return false;
			/* ignore action frames to TDLS-peers */
			if (ieee80211_is_action(hdr->frame_control) &&
3597
			    !is_broadcast_ether_addr(bssid) &&
3598 3599
			    !ether_addr_equal(bssid, hdr->addr1))
				return false;
3600
		}
3601
		return true;
3602
	case NL80211_IFTYPE_WDS:
3603
		if (bssid || !ieee80211_is_data(hdr->frame_control))
3604
			return false;
3605
		return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3606
	case NL80211_IFTYPE_P2P_DEVICE:
3607 3608 3609 3610
		return 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);
3611 3612 3613
	case NL80211_IFTYPE_NAN:
		/* Currently no frames on NAN interface are allowed */
		return false;
3614
	default:
J
Johannes Berg 已提交
3615
		break;
3616 3617
	}

3618 3619
	WARN_ON_ONCE(1);
	return false;
3620 3621
}

J
Johannes Berg 已提交
3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641
void ieee80211_check_fast_rx(struct sta_info *sta)
{
	struct ieee80211_sub_if_data *sdata = sta->sdata;
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_key *key;
	struct ieee80211_fast_rx fastrx = {
		.dev = sdata->dev,
		.vif_type = sdata->vif.type,
		.control_port_protocol = sdata->control_port_protocol,
	}, *old, *new = NULL;
	bool assign = false;

	/* use sparse to check that we don't return without updating */
	__acquire(check_fast_rx);

	BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
	BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
	ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
	ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);

3642 3643
	fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);

J
Johannes Berg 已提交
3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793
	/* fast-rx doesn't do reordering */
	if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
	    !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
		goto clear;

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_STATION:
		/* 4-addr is harder to deal with, later maybe */
		if (sdata->u.mgd.use_4addr)
			goto clear;
		/* software powersave is a huge mess, avoid all of it */
		if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
			goto clear;
		if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
		    !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
			goto clear;
		if (sta->sta.tdls) {
			fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
			fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
			fastrx.expected_ds_bits = 0;
		} else {
			fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
			fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
			fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
			fastrx.expected_ds_bits =
				cpu_to_le16(IEEE80211_FCTL_FROMDS);
		}
		break;
	case NL80211_IFTYPE_AP_VLAN:
	case NL80211_IFTYPE_AP:
		/* parallel-rx requires this, at least with calls to
		 * ieee80211_sta_ps_transition()
		 */
		if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
			goto clear;
		fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
		fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
		fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);

		fastrx.internal_forward =
			!(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
			(sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
			 !sdata->u.vlan.sta);
		break;
	default:
		goto clear;
	}

	if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
		goto clear;

	rcu_read_lock();
	key = rcu_dereference(sta->ptk[sta->ptk_idx]);
	if (key) {
		switch (key->conf.cipher) {
		case WLAN_CIPHER_SUITE_TKIP:
			/* we don't want to deal with MMIC in fast-rx */
			goto clear_rcu;
		case WLAN_CIPHER_SUITE_CCMP:
		case WLAN_CIPHER_SUITE_CCMP_256:
		case WLAN_CIPHER_SUITE_GCMP:
		case WLAN_CIPHER_SUITE_GCMP_256:
			break;
		default:
			/* we also don't want to deal with WEP or cipher scheme
			 * since those require looking up the key idx in the
			 * frame, rather than assuming the PTK is used
			 * (we need to revisit this once we implement the real
			 * PTK index, which is now valid in the spec, but we
			 * haven't implemented that part yet)
			 */
			goto clear_rcu;
		}

		fastrx.key = true;
		fastrx.icv_len = key->conf.icv_len;
	}

	assign = true;
 clear_rcu:
	rcu_read_unlock();
 clear:
	__release(check_fast_rx);

	if (assign)
		new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);

	spin_lock_bh(&sta->lock);
	old = rcu_dereference_protected(sta->fast_rx, true);
	rcu_assign_pointer(sta->fast_rx, new);
	spin_unlock_bh(&sta->lock);

	if (old)
		kfree_rcu(old, rcu_head);
}

void ieee80211_clear_fast_rx(struct sta_info *sta)
{
	struct ieee80211_fast_rx *old;

	spin_lock_bh(&sta->lock);
	old = rcu_dereference_protected(sta->fast_rx, true);
	RCU_INIT_POINTER(sta->fast_rx, NULL);
	spin_unlock_bh(&sta->lock);

	if (old)
		kfree_rcu(old, rcu_head);
}

void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;

	lockdep_assert_held(&local->sta_mtx);

	list_for_each_entry_rcu(sta, &local->sta_list, list) {
		if (sdata != sta->sdata &&
		    (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
			continue;
		ieee80211_check_fast_rx(sta);
	}
}

void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;

	mutex_lock(&local->sta_mtx);
	__ieee80211_check_fast_rx_iface(sdata);
	mutex_unlock(&local->sta_mtx);
}

static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
				     struct ieee80211_fast_rx *fast_rx)
{
	struct sk_buff *skb = rx->skb;
	struct ieee80211_hdr *hdr = (void *)skb->data;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct sta_info *sta = rx->sta;
	int orig_len = skb->len;
	int snap_offs = ieee80211_hdrlen(hdr->frame_control);
	struct {
		u8 snap[sizeof(rfc1042_header)];
		__be16 proto;
	} *payload __aligned(2);
	struct {
		u8 da[ETH_ALEN];
		u8 sa[ETH_ALEN];
	} addrs __aligned(2);
3794 3795 3796 3797
	struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;

	if (fast_rx->uses_rss)
		stats = this_cpu_ptr(sta->pcpu_rx_stats);
J
Johannes Berg 已提交
3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878

	/* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
	 * to a common data structure; drivers can implement that per queue
	 * but we don't have that information in mac80211
	 */
	if (!(status->flag & RX_FLAG_DUP_VALIDATED))
		return false;

#define FAST_RX_CRYPT_FLAGS	(RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)

	/* If using encryption, we also need to have:
	 *  - PN_VALIDATED: similar, but the implementation is tricky
	 *  - DECRYPTED: necessary for PN_VALIDATED
	 */
	if (fast_rx->key &&
	    (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
		return false;

	/* we don't deal with A-MSDU deaggregation here */
	if (status->rx_flags & IEEE80211_RX_AMSDU)
		return false;

	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
		return false;

	if (unlikely(ieee80211_is_frag(hdr)))
		return false;

	/* Since our interface address cannot be multicast, this
	 * implicitly also rejects multicast frames without the
	 * explicit check.
	 *
	 * We shouldn't get any *data* frames not addressed to us
	 * (AP mode will accept multicast *management* frames), but
	 * punting here will make it go through the full checks in
	 * ieee80211_accept_frame().
	 */
	if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
		return false;

	if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
					      IEEE80211_FCTL_TODS)) !=
	    fast_rx->expected_ds_bits)
		goto drop;

	/* assign the key to drop unencrypted frames (later)
	 * and strip the IV/MIC if necessary
	 */
	if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
		/* GCMP header length is the same */
		snap_offs += IEEE80211_CCMP_HDR_LEN;
	}

	if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
		goto drop;
	payload = (void *)(skb->data + snap_offs);

	if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
		return false;

	/* Don't handle these here since they require special code.
	 * Accept AARP and IPX even though they should come with a
	 * bridge-tunnel header - but if we get them this way then
	 * there's little point in discarding them.
	 */
	if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
		     payload->proto == fast_rx->control_port_protocol))
		return false;

	/* after this point, don't punt to the slowpath! */

	if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
	    pskb_trim(skb, skb->len - fast_rx->icv_len))
		goto drop;

	if (unlikely(fast_rx->sta_notify)) {
		ieee80211_sta_rx_notify(rx->sdata, hdr);
		fast_rx->sta_notify = false;
	}

	/* statistics part of ieee80211_rx_h_sta_process() */
3879 3880
	stats->last_rx = jiffies;
	stats->last_rate = sta_stats_encode_rate(status);
J
Johannes Berg 已提交
3881

3882
	stats->fragments++;
3883
	stats->packets++;
J
Johannes Berg 已提交
3884 3885

	if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
3886 3887 3888 3889
		stats->last_signal = status->signal;
		if (!fast_rx->uses_rss)
			ewma_signal_add(&sta->rx_stats_avg.signal,
					-status->signal);
J
Johannes Berg 已提交
3890 3891 3892 3893 3894
	}

	if (status->chains) {
		int i;

3895
		stats->chains = status->chains;
J
Johannes Berg 已提交
3896 3897 3898 3899 3900 3901
		for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
			int signal = status->chain_signal[i];

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

3902 3903 3904 3905
			stats->chain_signal_last[i] = signal;
			if (!fast_rx->uses_rss)
				ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
						-signal);
J
Johannes Berg 已提交
3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929
		}
	}
	/* end of statistics */

	if (rx->key && !ieee80211_has_protected(hdr->frame_control))
		goto drop;

	/* do the header conversion - first grab the addresses */
	ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
	ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
	/* remove the SNAP but leave the ethertype */
	skb_pull(skb, snap_offs + sizeof(rfc1042_header));
	/* push the addresses in front */
	memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));

	skb->dev = fast_rx->dev;

	ieee80211_rx_stats(fast_rx->dev, skb->len);

	/* The seqno index has the same property as needed
	 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
	 * for non-QoS-data frames. Here we know it's a data
	 * frame, so count MSDUs.
	 */
3930 3931 3932 3933
	u64_stats_update_begin(&stats->syncp);
	stats->msdu[rx->seqno_idx]++;
	stats->bytes += orig_len;
	u64_stats_update_end(&stats->syncp);
J
Johannes Berg 已提交
3934 3935

	if (fast_rx->internal_forward) {
3936 3937
		struct sk_buff *xmit_skb = NULL;
		bool multicast = is_multicast_ether_addr(skb->data);
J
Johannes Berg 已提交
3938

3939 3940 3941 3942 3943 3944
		if (multicast) {
			xmit_skb = skb_copy(skb, GFP_ATOMIC);
		} else if (sta_info_get(rx->sdata, skb->data)) {
			xmit_skb = skb;
			skb = NULL;
		}
J
Johannes Berg 已提交
3945

3946
		if (xmit_skb) {
J
Johannes Berg 已提交
3947 3948 3949 3950 3951
			/*
			 * Send to wireless media and increase priority by 256
			 * to keep the received priority instead of
			 * reclassifying the frame (see cfg80211_classify8021d).
			 */
3952 3953 3954 3955 3956
			xmit_skb->priority += 256;
			xmit_skb->protocol = htons(ETH_P_802_3);
			skb_reset_network_header(xmit_skb);
			skb_reset_mac_header(xmit_skb);
			dev_queue_xmit(xmit_skb);
J
Johannes Berg 已提交
3957
		}
3958 3959 3960

		if (!skb)
			return true;
J
Johannes Berg 已提交
3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973
	}

	/* deliver to local stack */
	skb->protocol = eth_type_trans(skb, fast_rx->dev);
	memset(skb->cb, 0, sizeof(skb->cb));
	if (rx->napi)
		napi_gro_receive(rx->napi, skb);
	else
		netif_receive_skb(skb);

	return true;
 drop:
	dev_kfree_skb(skb);
3974
	stats->dropped++;
J
Johannes Berg 已提交
3975 3976 3977
	return true;
}

3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991
/*
 * 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;

	rx->skb = skb;

J
Johannes Berg 已提交
3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006
	/* See if we can do fast-rx; if we have to copy we already lost,
	 * so punt in that case. We should never have to deliver a data
	 * frame to multiple interfaces anyway.
	 *
	 * We skip the ieee80211_accept_frame() call and do the necessary
	 * checking inside ieee80211_invoke_fast_rx().
	 */
	if (consume && rx->sta) {
		struct ieee80211_fast_rx *fast_rx;

		fast_rx = rcu_dereference(rx->sta->fast_rx);
		if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
			return true;
	}

4007
	if (!ieee80211_accept_frame(rx))
4008 4009 4010 4011 4012 4013 4014
		return false;

	if (!consume) {
		skb = skb_copy(skb, GFP_ATOMIC);
		if (!skb) {
			if (net_ratelimit())
				wiphy_debug(local->hw.wiphy,
4015
					"failed to copy skb for %s\n",
4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026
					sdata->name);
			return true;
		}

		rx->skb = skb;
	}

	ieee80211_invoke_rx_handlers(rx);
	return true;
}

4027
/*
4028
 * This is the actual Rx frames handler. as it belongs to Rx path it must
4029
 * be called with rcu_read_lock protection.
4030
 */
4031
static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4032
					 struct ieee80211_sta *pubsta,
4033 4034
					 struct sk_buff *skb,
					 struct napi_struct *napi)
4035 4036 4037 4038
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_hdr *hdr;
Z
Zhu Yi 已提交
4039
	__le16 fc;
4040
	struct ieee80211_rx_data rx;
4041
	struct ieee80211_sub_if_data *prev;
4042
	struct rhlist_head *tmp;
Z
Zhu Yi 已提交
4043
	int err = 0;
4044

Z
Zhu Yi 已提交
4045
	fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4046 4047 4048
	memset(&rx, 0, sizeof(rx));
	rx.skb = skb;
	rx.local = local;
4049
	rx.napi = napi;
4050

Z
Zhu Yi 已提交
4051
	if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4052
		I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4053

4054 4055 4056 4057 4058 4059 4060
	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
4061
		err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4062
	}
Z
Zhu Yi 已提交
4063 4064 4065 4066 4067 4068 4069

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

	hdr = (struct ieee80211_hdr *)skb->data;
4070
	ieee80211_parse_qos(&rx);
4071
	ieee80211_verify_alignment(&rx);
4072

J
Johannes Berg 已提交
4073 4074 4075 4076
	if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
		     ieee80211_is_beacon(hdr->frame_control)))
		ieee80211_scan_rx(local, skb);

4077 4078 4079 4080 4081 4082 4083 4084
	if (pubsta) {
		rx.sta = container_of(pubsta, struct sta_info, sta);
		rx.sdata = rx.sta->sdata;
		if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
			return;
		goto out;
	} else if (ieee80211_is_data(fc)) {
		struct sta_info *sta, *prev_sta;
4085

4086
		prev_sta = NULL;
4087

4088
		for_each_sta_info(local, hdr->addr2, sta, tmp) {
4089 4090 4091 4092 4093 4094 4095
			if (!prev_sta) {
				prev_sta = sta;
				continue;
			}

			rx.sta = prev_sta;
			rx.sdata = prev_sta->sdata;
4096
			ieee80211_prepare_and_rx_handle(&rx, skb, false);
4097

4098
			prev_sta = sta;
4099
		}
4100 4101 4102 4103 4104

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

4105
			if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4106
				return;
4107
			goto out;
4108
		}
4109 4110
	}

4111
	prev = NULL;
4112

4113 4114 4115
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(sdata))
			continue;
J
Johannes Berg 已提交
4116

4117 4118 4119
		if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
		    sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
			continue;
J
Johannes Berg 已提交
4120

4121 4122 4123 4124 4125
		/*
		 * 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
		 */
4126

4127
		if (!prev) {
4128
			prev = sdata;
4129
			continue;
J
Johannes Berg 已提交
4130
		}
4131

4132
		rx.sta = sta_info_get_bss(prev, hdr->addr2);
4133 4134
		rx.sdata = prev;
		ieee80211_prepare_and_rx_handle(&rx, skb, false);
4135

4136 4137 4138 4139
		prev = sdata;
	}

	if (prev) {
4140
		rx.sta = sta_info_get_bss(prev, hdr->addr2);
4141
		rx.sdata = prev;
4142

4143 4144
		if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
			return;
4145
	}
4146

4147
 out:
4148
	dev_kfree_skb(skb);
4149
}
4150 4151 4152 4153 4154

/*
 * This is the receive path handler. It is called by a low level driver when an
 * 802.11 MPDU is received from the hardware.
 */
4155 4156
void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
		       struct sk_buff *skb, struct napi_struct *napi)
4157 4158
{
	struct ieee80211_local *local = hw_to_local(hw);
4159 4160
	struct ieee80211_rate *rate = NULL;
	struct ieee80211_supported_band *sband;
4161
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4162

4163 4164
	WARN_ON_ONCE(softirq_count() == 0);

4165
	if (WARN_ON(status->band >= NUM_NL80211_BANDS))
J
Johannes Berg 已提交
4166
		goto drop;
4167 4168

	sband = local->hw.wiphy->bands[status->band];
J
Johannes Berg 已提交
4169 4170
	if (WARN_ON(!sband))
		goto drop;
4171

J
Johannes Berg 已提交
4172 4173 4174 4175 4176 4177 4178
	/*
	 * 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
4179 4180
	if (unlikely(local->quiescing || local->suspended))
		goto drop;
J
Johannes Berg 已提交
4181

4182 4183 4184 4185
	/* We might be during a HW reconfig, prevent Rx for the same reason */
	if (unlikely(local->in_reconfig))
		goto drop;

4186 4187 4188 4189
	/*
	 * The same happens when we're not even started,
	 * but that's worth a warning.
	 */
J
Johannes Berg 已提交
4190 4191
	if (WARN_ON(!local->started))
		goto drop;
4192

4193
	if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4194
		/*
4195 4196
		 * Validate the rate, unless a PLCP error means that
		 * we probably can't have a valid rate here anyway.
4197
		 */
4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209

		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
4210
			if (WARN(status->rate_idx > 76,
4211 4212 4213 4214 4215 4216
				 "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;
4217 4218 4219 4220 4221 4222 4223
		} 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;
4224
		} else {
J
Johannes Berg 已提交
4225
			if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4226 4227 4228
				goto drop;
			rate = &sband->bitrates[status->rate_idx];
		}
4229
	}
4230

4231 4232
	status->rx_flags = 0;

4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245
	/*
	 * 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.
	 */
4246
	skb = ieee80211_rx_monitor(local, skb, rate);
4247 4248 4249 4250 4251
	if (!skb) {
		rcu_read_unlock();
		return;
	}

4252 4253 4254
	ieee80211_tpt_led_trig_rx(local,
			((struct ieee80211_hdr *)skb->data)->frame_control,
			skb->len);
4255 4256

	__ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4257 4258

	rcu_read_unlock();
J
Johannes Berg 已提交
4259 4260 4261 4262

	return;
 drop:
	kfree_skb(skb);
4263
}
4264
EXPORT_SYMBOL(ieee80211_rx_napi);
4265 4266 4267

/* 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 */
4268
void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4269 4270 4271 4272 4273 4274 4275 4276 4277 4278
{
	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);