2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/jiffies.h>
15 #include <linux/slab.h>
16 #include <linux/kernel.h>
17 #include <linux/skbuff.h>
18 #include <linux/netdevice.h>
19 #include <linux/etherdevice.h>
20 #include <linux/rcupdate.h>
21 #include <linux/export.h>
22 #include <linux/bitops.h>
23 #include <net/mac80211.h>
24 #include <net/ieee80211_radiotap.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
37 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
39 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
41 u64_stats_update_begin(&tstats->syncp);
43 tstats->rx_bytes += len;
44 u64_stats_update_end(&tstats->syncp);
47 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
48 enum nl80211_iftype type)
50 __le16 fc = hdr->frame_control;
52 if (ieee80211_is_data(fc)) {
53 if (len < 24) /* drop incorrect hdr len (data) */
56 if (ieee80211_has_a4(fc))
58 if (ieee80211_has_tods(fc))
60 if (ieee80211_has_fromds(fc))
66 if (ieee80211_is_mgmt(fc)) {
67 if (len < 24) /* drop incorrect hdr len (mgmt) */
72 if (ieee80211_is_ctl(fc)) {
73 if (ieee80211_is_pspoll(fc))
76 if (ieee80211_is_back_req(fc)) {
78 case NL80211_IFTYPE_STATION:
80 case NL80211_IFTYPE_AP:
81 case NL80211_IFTYPE_AP_VLAN:
84 break; /* fall through to the return */
93 * monitor mode reception
95 * This function cleans up the SKB, i.e. it removes all the stuff
96 * only useful for monitoring.
98 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
100 unsigned int rtap_vendor_space)
102 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
103 if (likely(skb->len > FCS_LEN))
104 __pskb_trim(skb, skb->len - FCS_LEN);
113 __pskb_pull(skb, rtap_vendor_space);
118 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
119 unsigned int rtap_vendor_space)
121 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
122 struct ieee80211_hdr *hdr;
124 hdr = (void *)(skb->data + rtap_vendor_space);
126 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
127 RX_FLAG_FAILED_PLCP_CRC |
128 RX_FLAG_ONLY_MONITOR))
131 if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
134 if (ieee80211_is_ctl(hdr->frame_control) &&
135 !ieee80211_is_pspoll(hdr->frame_control) &&
136 !ieee80211_is_back_req(hdr->frame_control))
143 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
144 struct ieee80211_rx_status *status,
149 /* always present fields */
150 len = sizeof(struct ieee80211_radiotap_header) + 8;
152 /* allocate extra bitmaps */
154 len += 4 * hweight8(status->chains);
156 if (ieee80211_have_rx_timestamp(status)) {
160 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
163 /* antenna field, if we don't have per-chain info */
167 /* padding for RX_FLAGS if necessary */
170 if (status->flag & RX_FLAG_HT) /* HT info */
173 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
178 if (status->flag & RX_FLAG_VHT) {
183 if (status->chains) {
184 /* antenna and antenna signal fields */
185 len += 2 * hweight8(status->chains);
188 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
189 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
191 /* vendor presence bitmap */
193 /* alignment for fixed 6-byte vendor data header */
195 /* vendor data header */
197 if (WARN_ON(rtap->align == 0))
199 len = ALIGN(len, rtap->align);
200 len += rtap->len + rtap->pad;
207 * ieee80211_add_rx_radiotap_header - add radiotap header
209 * add a radiotap header containing all the fields which the hardware provided.
212 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
214 struct ieee80211_rate *rate,
215 int rtap_len, bool has_fcs)
217 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
218 struct ieee80211_radiotap_header *rthdr;
223 u16 channel_flags = 0;
225 unsigned long chains = status->chains;
226 struct ieee80211_vendor_radiotap rtap = {};
228 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
229 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
230 /* rtap.len and rtap.pad are undone immediately */
231 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
235 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
238 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
239 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
240 it_present = &rthdr->it_present;
242 /* radiotap header, set always present flags */
243 rthdr->it_len = cpu_to_le16(rtap_len);
244 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
245 BIT(IEEE80211_RADIOTAP_CHANNEL) |
246 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
249 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
251 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
253 BIT(IEEE80211_RADIOTAP_EXT) |
254 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
255 put_unaligned_le32(it_present_val, it_present);
257 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
258 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
261 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
262 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
263 BIT(IEEE80211_RADIOTAP_EXT);
264 put_unaligned_le32(it_present_val, it_present);
266 it_present_val = rtap.present;
269 put_unaligned_le32(it_present_val, it_present);
271 pos = (void *)(it_present + 1);
273 /* the order of the following fields is important */
275 /* IEEE80211_RADIOTAP_TSFT */
276 if (ieee80211_have_rx_timestamp(status)) {
278 while ((pos - (u8 *)rthdr) & 7)
281 ieee80211_calculate_rx_timestamp(local, status,
284 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
288 /* IEEE80211_RADIOTAP_FLAGS */
289 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
290 *pos |= IEEE80211_RADIOTAP_F_FCS;
291 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
292 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
293 if (status->flag & RX_FLAG_SHORTPRE)
294 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
297 /* IEEE80211_RADIOTAP_RATE */
298 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
300 * Without rate information don't add it. If we have,
301 * MCS information is a separate field in radiotap,
302 * added below. The byte here is needed as padding
303 * for the channel though, so initialise it to 0.
308 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
309 if (status->flag & RX_FLAG_10MHZ)
311 else if (status->flag & RX_FLAG_5MHZ)
313 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
317 /* IEEE80211_RADIOTAP_CHANNEL */
318 put_unaligned_le16(status->freq, pos);
320 if (status->flag & RX_FLAG_10MHZ)
321 channel_flags |= IEEE80211_CHAN_HALF;
322 else if (status->flag & RX_FLAG_5MHZ)
323 channel_flags |= IEEE80211_CHAN_QUARTER;
325 if (status->band == IEEE80211_BAND_5GHZ)
326 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
327 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
328 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
329 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
330 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
332 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
334 channel_flags |= IEEE80211_CHAN_2GHZ;
335 put_unaligned_le16(channel_flags, pos);
338 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
339 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
340 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
341 *pos = status->signal;
343 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
347 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
349 if (!status->chains) {
350 /* IEEE80211_RADIOTAP_ANTENNA */
351 *pos = status->antenna;
355 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
357 /* IEEE80211_RADIOTAP_RX_FLAGS */
358 /* ensure 2 byte alignment for the 2 byte field as required */
359 if ((pos - (u8 *)rthdr) & 1)
361 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
362 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
363 put_unaligned_le16(rx_flags, pos);
366 if (status->flag & RX_FLAG_HT) {
369 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
370 *pos++ = local->hw.radiotap_mcs_details;
372 if (status->flag & RX_FLAG_SHORT_GI)
373 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
374 if (status->flag & RX_FLAG_40MHZ)
375 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
376 if (status->flag & RX_FLAG_HT_GF)
377 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
378 if (status->flag & RX_FLAG_LDPC)
379 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
380 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
381 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
383 *pos++ = status->rate_idx;
386 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
389 /* ensure 4 byte alignment */
390 while ((pos - (u8 *)rthdr) & 3)
393 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
394 put_unaligned_le32(status->ampdu_reference, pos);
396 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
397 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
398 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
399 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
400 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
401 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
402 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
403 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
404 put_unaligned_le16(flags, pos);
406 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
407 *pos++ = status->ampdu_delimiter_crc;
413 if (status->flag & RX_FLAG_VHT) {
414 u16 known = local->hw.radiotap_vht_details;
416 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
417 put_unaligned_le16(known, pos);
420 if (status->flag & RX_FLAG_SHORT_GI)
421 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
422 /* in VHT, STBC is binary */
423 if (status->flag & RX_FLAG_STBC_MASK)
424 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
425 if (status->vht_flag & RX_VHT_FLAG_BF)
426 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
429 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
431 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
433 else if (status->flag & RX_FLAG_40MHZ)
438 *pos = (status->rate_idx << 4) | status->vht_nss;
441 if (status->flag & RX_FLAG_LDPC)
442 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
450 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
451 *pos++ = status->chain_signal[chain];
455 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
456 /* ensure 2 byte alignment for the vendor field as required */
457 if ((pos - (u8 *)rthdr) & 1)
459 *pos++ = rtap.oui[0];
460 *pos++ = rtap.oui[1];
461 *pos++ = rtap.oui[2];
463 put_unaligned_le16(rtap.len, pos);
465 /* align the actual payload as requested */
466 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
468 /* data (and possible padding) already follows */
473 * This function copies a received frame to all monitor interfaces and
474 * returns a cleaned-up SKB that no longer includes the FCS nor the
475 * radiotap header the driver might have added.
477 static struct sk_buff *
478 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
479 struct ieee80211_rate *rate)
481 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
482 struct ieee80211_sub_if_data *sdata;
483 int rt_hdrlen, needed_headroom;
484 struct sk_buff *skb, *skb2;
485 struct net_device *prev_dev = NULL;
486 int present_fcs_len = 0;
487 unsigned int rtap_vendor_space = 0;
489 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
490 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
492 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
496 * First, we may need to make a copy of the skb because
497 * (1) we need to modify it for radiotap (if not present), and
498 * (2) the other RX handlers will modify the skb we got.
500 * We don't need to, of course, if we aren't going to return
501 * the SKB because it has a bad FCS/PLCP checksum.
504 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
505 present_fcs_len = FCS_LEN;
507 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
508 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
509 dev_kfree_skb(origskb);
513 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
514 if (should_drop_frame(origskb, present_fcs_len,
515 rtap_vendor_space)) {
516 dev_kfree_skb(origskb);
520 return remove_monitor_info(local, origskb, rtap_vendor_space);
523 /* room for the radiotap header based on driver features */
524 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
525 needed_headroom = rt_hdrlen - rtap_vendor_space;
527 if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
528 /* only need to expand headroom if necessary */
533 * This shouldn't trigger often because most devices have an
534 * RX header they pull before we get here, and that should
535 * be big enough for our radiotap information. We should
536 * probably export the length to drivers so that we can have
537 * them allocate enough headroom to start with.
539 if (skb_headroom(skb) < needed_headroom &&
540 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
546 * Need to make a copy and possibly remove radiotap header
547 * and FCS from the original.
549 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
551 origskb = remove_monitor_info(local, origskb,
558 /* prepend radiotap information */
559 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
561 skb_reset_mac_header(skb);
562 skb->ip_summed = CHECKSUM_UNNECESSARY;
563 skb->pkt_type = PACKET_OTHERHOST;
564 skb->protocol = htons(ETH_P_802_2);
566 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
567 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
570 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
573 if (!ieee80211_sdata_running(sdata))
577 skb2 = skb_clone(skb, GFP_ATOMIC);
579 skb2->dev = prev_dev;
580 netif_receive_skb(skb2);
584 prev_dev = sdata->dev;
585 ieee80211_rx_stats(sdata->dev, skb->len);
590 netif_receive_skb(skb);
597 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
599 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
600 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
601 int tid, seqno_idx, security_idx;
603 /* does the frame have a qos control field? */
604 if (ieee80211_is_data_qos(hdr->frame_control)) {
605 u8 *qc = ieee80211_get_qos_ctl(hdr);
606 /* frame has qos control */
607 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
608 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
609 status->rx_flags |= IEEE80211_RX_AMSDU;
615 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
617 * Sequence numbers for management frames, QoS data
618 * frames with a broadcast/multicast address in the
619 * Address 1 field, and all non-QoS data frames sent
620 * by QoS STAs are assigned using an additional single
621 * modulo-4096 counter, [...]
623 * We also use that counter for non-QoS STAs.
625 seqno_idx = IEEE80211_NUM_TIDS;
627 if (ieee80211_is_mgmt(hdr->frame_control))
628 security_idx = IEEE80211_NUM_TIDS;
632 rx->seqno_idx = seqno_idx;
633 rx->security_idx = security_idx;
634 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
635 * For now, set skb->priority to 0 for other cases. */
636 rx->skb->priority = (tid > 7) ? 0 : tid;
640 * DOC: Packet alignment
642 * Drivers always need to pass packets that are aligned to two-byte boundaries
645 * Additionally, should, if possible, align the payload data in a way that
646 * guarantees that the contained IP header is aligned to a four-byte
647 * boundary. In the case of regular frames, this simply means aligning the
648 * payload to a four-byte boundary (because either the IP header is directly
649 * contained, or IV/RFC1042 headers that have a length divisible by four are
650 * in front of it). If the payload data is not properly aligned and the
651 * architecture doesn't support efficient unaligned operations, mac80211
652 * will align the data.
654 * With A-MSDU frames, however, the payload data address must yield two modulo
655 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
656 * push the IP header further back to a multiple of four again. Thankfully, the
657 * specs were sane enough this time around to require padding each A-MSDU
658 * subframe to a length that is a multiple of four.
660 * Padding like Atheros hardware adds which is between the 802.11 header and
661 * the payload is not supported, the driver is required to move the 802.11
662 * header to be directly in front of the payload in that case.
664 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
666 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
667 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
674 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
676 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
678 if (is_multicast_ether_addr(hdr->addr1))
681 return ieee80211_is_robust_mgmt_frame(skb);
685 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
687 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
689 if (!is_multicast_ether_addr(hdr->addr1))
692 return ieee80211_is_robust_mgmt_frame(skb);
696 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
697 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
699 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
700 struct ieee80211_mmie *mmie;
701 struct ieee80211_mmie_16 *mmie16;
703 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
706 if (!ieee80211_is_robust_mgmt_frame(skb))
707 return -1; /* not a robust management frame */
709 mmie = (struct ieee80211_mmie *)
710 (skb->data + skb->len - sizeof(*mmie));
711 if (mmie->element_id == WLAN_EID_MMIE &&
712 mmie->length == sizeof(*mmie) - 2)
713 return le16_to_cpu(mmie->key_id);
715 mmie16 = (struct ieee80211_mmie_16 *)
716 (skb->data + skb->len - sizeof(*mmie16));
717 if (skb->len >= 24 + sizeof(*mmie16) &&
718 mmie16->element_id == WLAN_EID_MMIE &&
719 mmie16->length == sizeof(*mmie16) - 2)
720 return le16_to_cpu(mmie16->key_id);
725 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
728 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
733 fc = hdr->frame_control;
734 hdrlen = ieee80211_hdrlen(fc);
736 if (skb->len < hdrlen + cs->hdr_len)
739 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
740 keyid &= cs->key_idx_mask;
741 keyid >>= cs->key_idx_shift;
746 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
748 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
749 char *dev_addr = rx->sdata->vif.addr;
751 if (ieee80211_is_data(hdr->frame_control)) {
752 if (is_multicast_ether_addr(hdr->addr1)) {
753 if (ieee80211_has_tods(hdr->frame_control) ||
754 !ieee80211_has_fromds(hdr->frame_control))
755 return RX_DROP_MONITOR;
756 if (ether_addr_equal(hdr->addr3, dev_addr))
757 return RX_DROP_MONITOR;
759 if (!ieee80211_has_a4(hdr->frame_control))
760 return RX_DROP_MONITOR;
761 if (ether_addr_equal(hdr->addr4, dev_addr))
762 return RX_DROP_MONITOR;
766 /* If there is not an established peer link and this is not a peer link
767 * establisment frame, beacon or probe, drop the frame.
770 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
771 struct ieee80211_mgmt *mgmt;
773 if (!ieee80211_is_mgmt(hdr->frame_control))
774 return RX_DROP_MONITOR;
776 if (ieee80211_is_action(hdr->frame_control)) {
779 /* make sure category field is present */
780 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
781 return RX_DROP_MONITOR;
783 mgmt = (struct ieee80211_mgmt *)hdr;
784 category = mgmt->u.action.category;
785 if (category != WLAN_CATEGORY_MESH_ACTION &&
786 category != WLAN_CATEGORY_SELF_PROTECTED)
787 return RX_DROP_MONITOR;
791 if (ieee80211_is_probe_req(hdr->frame_control) ||
792 ieee80211_is_probe_resp(hdr->frame_control) ||
793 ieee80211_is_beacon(hdr->frame_control) ||
794 ieee80211_is_auth(hdr->frame_control))
797 return RX_DROP_MONITOR;
803 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
806 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
807 struct sk_buff *tail = skb_peek_tail(frames);
808 struct ieee80211_rx_status *status;
810 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
816 status = IEEE80211_SKB_RXCB(tail);
817 if (status->flag & RX_FLAG_AMSDU_MORE)
823 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
824 struct tid_ampdu_rx *tid_agg_rx,
826 struct sk_buff_head *frames)
828 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
830 struct ieee80211_rx_status *status;
832 lockdep_assert_held(&tid_agg_rx->reorder_lock);
834 if (skb_queue_empty(skb_list))
837 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
838 __skb_queue_purge(skb_list);
842 /* release frames from the reorder ring buffer */
843 tid_agg_rx->stored_mpdu_num--;
844 while ((skb = __skb_dequeue(skb_list))) {
845 status = IEEE80211_SKB_RXCB(skb);
846 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
847 __skb_queue_tail(frames, skb);
851 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
852 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
855 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
856 struct tid_ampdu_rx *tid_agg_rx,
858 struct sk_buff_head *frames)
862 lockdep_assert_held(&tid_agg_rx->reorder_lock);
864 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
865 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
866 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
872 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
873 * the skb was added to the buffer longer than this time ago, the earlier
874 * frames that have not yet been received are assumed to be lost and the skb
875 * can be released for processing. This may also release other skb's from the
876 * reorder buffer if there are no additional gaps between the frames.
878 * Callers must hold tid_agg_rx->reorder_lock.
880 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
882 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
883 struct tid_ampdu_rx *tid_agg_rx,
884 struct sk_buff_head *frames)
888 lockdep_assert_held(&tid_agg_rx->reorder_lock);
890 /* release the buffer until next missing frame */
891 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
892 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
893 tid_agg_rx->stored_mpdu_num) {
895 * No buffers ready to be released, but check whether any
896 * frames in the reorder buffer have timed out.
899 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
900 j = (j + 1) % tid_agg_rx->buf_size) {
901 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
906 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
907 HT_RX_REORDER_BUF_TIMEOUT))
908 goto set_release_timer;
910 /* don't leave incomplete A-MSDUs around */
911 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
912 i = (i + 1) % tid_agg_rx->buf_size)
913 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
915 ht_dbg_ratelimited(sdata,
916 "release an RX reorder frame due to timeout on earlier frames\n");
917 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
921 * Increment the head seq# also for the skipped slots.
923 tid_agg_rx->head_seq_num =
924 (tid_agg_rx->head_seq_num +
925 skipped) & IEEE80211_SN_MASK;
928 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
929 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
931 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
934 if (tid_agg_rx->stored_mpdu_num) {
935 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
937 for (; j != (index - 1) % tid_agg_rx->buf_size;
938 j = (j + 1) % tid_agg_rx->buf_size) {
939 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
945 if (!tid_agg_rx->removed)
946 mod_timer(&tid_agg_rx->reorder_timer,
947 tid_agg_rx->reorder_time[j] + 1 +
948 HT_RX_REORDER_BUF_TIMEOUT);
950 del_timer(&tid_agg_rx->reorder_timer);
955 * As this function belongs to the RX path it must be under
956 * rcu_read_lock protection. It returns false if the frame
957 * can be processed immediately, true if it was consumed.
959 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
960 struct tid_ampdu_rx *tid_agg_rx,
962 struct sk_buff_head *frames)
964 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
965 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
966 u16 sc = le16_to_cpu(hdr->seq_ctrl);
967 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
968 u16 head_seq_num, buf_size;
972 spin_lock(&tid_agg_rx->reorder_lock);
975 * Offloaded BA sessions have no known starting sequence number so pick
976 * one from first Rxed frame for this tid after BA was started.
978 if (unlikely(tid_agg_rx->auto_seq)) {
979 tid_agg_rx->auto_seq = false;
980 tid_agg_rx->ssn = mpdu_seq_num;
981 tid_agg_rx->head_seq_num = mpdu_seq_num;
984 buf_size = tid_agg_rx->buf_size;
985 head_seq_num = tid_agg_rx->head_seq_num;
987 /* frame with out of date sequence number */
988 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
994 * If frame the sequence number exceeds our buffering window
995 * size release some previous frames to make room for this one.
997 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
998 head_seq_num = ieee80211_sn_inc(
999 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1000 /* release stored frames up to new head to stack */
1001 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1002 head_seq_num, frames);
1005 /* Now the new frame is always in the range of the reordering buffer */
1007 index = mpdu_seq_num % tid_agg_rx->buf_size;
1009 /* check if we already stored this frame */
1010 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1016 * If the current MPDU is in the right order and nothing else
1017 * is stored we can process it directly, no need to buffer it.
1018 * If it is first but there's something stored, we may be able
1019 * to release frames after this one.
1021 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1022 tid_agg_rx->stored_mpdu_num == 0) {
1023 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1024 tid_agg_rx->head_seq_num =
1025 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1030 /* put the frame in the reordering buffer */
1031 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1032 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1033 tid_agg_rx->reorder_time[index] = jiffies;
1034 tid_agg_rx->stored_mpdu_num++;
1035 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1039 spin_unlock(&tid_agg_rx->reorder_lock);
1044 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1045 * true if the MPDU was buffered, false if it should be processed.
1047 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1048 struct sk_buff_head *frames)
1050 struct sk_buff *skb = rx->skb;
1051 struct ieee80211_local *local = rx->local;
1052 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1053 struct sta_info *sta = rx->sta;
1054 struct tid_ampdu_rx *tid_agg_rx;
1058 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1059 is_multicast_ether_addr(hdr->addr1))
1063 * filter the QoS data rx stream according to
1064 * STA/TID and check if this STA/TID is on aggregation
1070 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1071 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1072 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1074 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1078 /* qos null data frames are excluded */
1079 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1082 /* not part of a BA session */
1083 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1084 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1087 /* new, potentially un-ordered, ampdu frame - process it */
1089 /* reset session timer */
1090 if (tid_agg_rx->timeout)
1091 tid_agg_rx->last_rx = jiffies;
1093 /* if this mpdu is fragmented - terminate rx aggregation session */
1094 sc = le16_to_cpu(hdr->seq_ctrl);
1095 if (sc & IEEE80211_SCTL_FRAG) {
1096 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1097 skb_queue_tail(&rx->sdata->skb_queue, skb);
1098 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1103 * No locking needed -- we will only ever process one
1104 * RX packet at a time, and thus own tid_agg_rx. All
1105 * other code manipulating it needs to (and does) make
1106 * sure that we cannot get to it any more before doing
1109 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1114 __skb_queue_tail(frames, skb);
1117 static ieee80211_rx_result debug_noinline
1118 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1120 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1121 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1123 if (status->flag & RX_FLAG_DUP_VALIDATED)
1127 * Drop duplicate 802.11 retransmissions
1128 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1131 if (rx->skb->len < 24)
1134 if (ieee80211_is_ctl(hdr->frame_control) ||
1135 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1136 is_multicast_ether_addr(hdr->addr1))
1142 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1143 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1144 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1145 rx->sta->rx_stats.num_duplicates++;
1146 return RX_DROP_UNUSABLE;
1147 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1148 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1154 static ieee80211_rx_result debug_noinline
1155 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1157 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1159 /* Drop disallowed frame classes based on STA auth/assoc state;
1160 * IEEE 802.11, Chap 5.5.
1162 * mac80211 filters only based on association state, i.e. it drops
1163 * Class 3 frames from not associated stations. hostapd sends
1164 * deauth/disassoc frames when needed. In addition, hostapd is
1165 * responsible for filtering on both auth and assoc states.
1168 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1169 return ieee80211_rx_mesh_check(rx);
1171 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1172 ieee80211_is_pspoll(hdr->frame_control)) &&
1173 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1174 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1175 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1176 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1178 * accept port control frames from the AP even when it's not
1179 * yet marked ASSOC to prevent a race where we don't set the
1180 * assoc bit quickly enough before it sends the first frame
1182 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1183 ieee80211_is_data_present(hdr->frame_control)) {
1184 unsigned int hdrlen;
1187 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1189 if (rx->skb->len < hdrlen + 8)
1190 return RX_DROP_MONITOR;
1192 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
1193 if (ethertype == rx->sdata->control_port_protocol)
1197 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1198 cfg80211_rx_spurious_frame(rx->sdata->dev,
1201 return RX_DROP_UNUSABLE;
1203 return RX_DROP_MONITOR;
1210 static ieee80211_rx_result debug_noinline
1211 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1213 struct ieee80211_local *local;
1214 struct ieee80211_hdr *hdr;
1215 struct sk_buff *skb;
1219 hdr = (struct ieee80211_hdr *) skb->data;
1221 if (!local->pspolling)
1224 if (!ieee80211_has_fromds(hdr->frame_control))
1225 /* this is not from AP */
1228 if (!ieee80211_is_data(hdr->frame_control))
1231 if (!ieee80211_has_moredata(hdr->frame_control)) {
1232 /* AP has no more frames buffered for us */
1233 local->pspolling = false;
1237 /* more data bit is set, let's request a new frame from the AP */
1238 ieee80211_send_pspoll(local, rx->sdata);
1243 static void sta_ps_start(struct sta_info *sta)
1245 struct ieee80211_sub_if_data *sdata = sta->sdata;
1246 struct ieee80211_local *local = sdata->local;
1250 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1251 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1252 ps = &sdata->bss->ps;
1256 atomic_inc(&ps->num_sta_ps);
1257 set_sta_flag(sta, WLAN_STA_PS_STA);
1258 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1259 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1260 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1261 sta->sta.addr, sta->sta.aid);
1263 ieee80211_clear_fast_xmit(sta);
1265 if (!sta->sta.txq[0])
1268 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1269 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1271 if (!skb_queue_len(&txqi->queue))
1272 set_bit(tid, &sta->txq_buffered_tids);
1274 clear_bit(tid, &sta->txq_buffered_tids);
1278 static void sta_ps_end(struct sta_info *sta)
1280 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1281 sta->sta.addr, sta->sta.aid);
1283 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1285 * Clear the flag only if the other one is still set
1286 * so that the TX path won't start TX'ing new frames
1287 * directly ... In the case that the driver flag isn't
1288 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1290 clear_sta_flag(sta, WLAN_STA_PS_STA);
1291 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1292 sta->sta.addr, sta->sta.aid);
1296 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1297 clear_sta_flag(sta, WLAN_STA_PS_STA);
1298 ieee80211_sta_ps_deliver_wakeup(sta);
1301 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1303 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1306 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1308 /* Don't let the same PS state be set twice */
1309 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1310 if ((start && in_ps) || (!start && !in_ps))
1320 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1322 static ieee80211_rx_result debug_noinline
1323 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1325 struct ieee80211_sub_if_data *sdata = rx->sdata;
1326 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1327 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1333 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1334 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1338 * The device handles station powersave, so don't do anything about
1339 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1340 * it to mac80211 since they're handled.)
1342 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1346 * Don't do anything if the station isn't already asleep. In
1347 * the uAPSD case, the station will probably be marked asleep,
1348 * in the PS-Poll case the station must be confused ...
1350 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1353 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1354 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1355 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1356 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1358 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1361 /* Free PS Poll skb here instead of returning RX_DROP that would
1362 * count as an dropped frame. */
1363 dev_kfree_skb(rx->skb);
1366 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1367 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1368 ieee80211_has_pm(hdr->frame_control) &&
1369 (ieee80211_is_data_qos(hdr->frame_control) ||
1370 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1371 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1372 ac = ieee802_1d_to_ac[tid & 7];
1375 * If this AC is not trigger-enabled do nothing.
1377 * NB: This could/should check a separate bitmap of trigger-
1378 * enabled queues, but for now we only implement uAPSD w/o
1379 * TSPEC changes to the ACs, so they're always the same.
1381 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1384 /* if we are in a service period, do nothing */
1385 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1388 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1389 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1391 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1397 static ieee80211_rx_result debug_noinline
1398 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1400 struct sta_info *sta = rx->sta;
1401 struct sk_buff *skb = rx->skb;
1402 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1403 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1410 * Update last_rx only for IBSS packets which are for the current
1411 * BSSID and for station already AUTHORIZED to avoid keeping the
1412 * current IBSS network alive in cases where other STAs start
1413 * using different BSSID. This will also give the station another
1414 * chance to restart the authentication/authorization in case
1415 * something went wrong the first time.
1417 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1418 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1419 NL80211_IFTYPE_ADHOC);
1420 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1421 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1422 sta->rx_stats.last_rx = jiffies;
1423 if (ieee80211_is_data(hdr->frame_control) &&
1424 !is_multicast_ether_addr(hdr->addr1))
1425 sta->rx_stats.last_rate =
1426 sta_stats_encode_rate(status);
1428 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1429 sta->rx_stats.last_rx = jiffies;
1430 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1432 * Mesh beacons will update last_rx when if they are found to
1433 * match the current local configuration when processed.
1435 sta->rx_stats.last_rx = jiffies;
1436 if (ieee80211_is_data(hdr->frame_control))
1437 sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1440 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1441 ieee80211_sta_rx_notify(rx->sdata, hdr);
1443 sta->rx_stats.fragments++;
1444 sta->rx_stats.bytes += rx->skb->len;
1445 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1446 sta->rx_stats.last_signal = status->signal;
1447 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1450 if (status->chains) {
1451 sta->rx_stats.chains = status->chains;
1452 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1453 int signal = status->chain_signal[i];
1455 if (!(status->chains & BIT(i)))
1458 sta->rx_stats.chain_signal_last[i] = signal;
1459 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1465 * Change STA power saving mode only at the end of a frame
1466 * exchange sequence.
1468 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1469 !ieee80211_has_morefrags(hdr->frame_control) &&
1470 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1471 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1472 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1473 /* PM bit is only checked in frames where it isn't reserved,
1474 * in AP mode it's reserved in non-bufferable management frames
1475 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1477 (!ieee80211_is_mgmt(hdr->frame_control) ||
1478 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1479 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1480 if (!ieee80211_has_pm(hdr->frame_control))
1483 if (ieee80211_has_pm(hdr->frame_control))
1488 /* mesh power save support */
1489 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1490 ieee80211_mps_rx_h_sta_process(sta, hdr);
1493 * Drop (qos-)data::nullfunc frames silently, since they
1494 * are used only to control station power saving mode.
1496 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1497 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1498 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1501 * If we receive a 4-addr nullfunc frame from a STA
1502 * that was not moved to a 4-addr STA vlan yet send
1503 * the event to userspace and for older hostapd drop
1504 * the frame to the monitor interface.
1506 if (ieee80211_has_a4(hdr->frame_control) &&
1507 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1508 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1509 !rx->sdata->u.vlan.sta))) {
1510 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1511 cfg80211_rx_unexpected_4addr_frame(
1512 rx->sdata->dev, sta->sta.addr,
1514 return RX_DROP_MONITOR;
1517 * Update counter and free packet here to avoid
1518 * counting this as a dropped packed.
1520 sta->rx_stats.packets++;
1521 dev_kfree_skb(rx->skb);
1526 } /* ieee80211_rx_h_sta_process */
1528 static ieee80211_rx_result debug_noinline
1529 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1531 struct sk_buff *skb = rx->skb;
1532 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1533 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1536 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1537 struct ieee80211_key *sta_ptk = NULL;
1538 int mmie_keyidx = -1;
1540 const struct ieee80211_cipher_scheme *cs = NULL;
1545 * There are four types of keys:
1546 * - GTK (group keys)
1547 * - IGTK (group keys for management frames)
1548 * - PTK (pairwise keys)
1549 * - STK (station-to-station pairwise keys)
1551 * When selecting a key, we have to distinguish between multicast
1552 * (including broadcast) and unicast frames, the latter can only
1553 * use PTKs and STKs while the former always use GTKs and IGTKs.
1554 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1555 * unicast frames can also use key indices like GTKs. Hence, if we
1556 * don't have a PTK/STK we check the key index for a WEP key.
1558 * Note that in a regular BSS, multicast frames are sent by the
1559 * AP only, associated stations unicast the frame to the AP first
1560 * which then multicasts it on their behalf.
1562 * There is also a slight problem in IBSS mode: GTKs are negotiated
1563 * with each station, that is something we don't currently handle.
1564 * The spec seems to expect that one negotiates the same key with
1565 * every station but there's no such requirement; VLANs could be
1569 /* start without a key */
1571 fc = hdr->frame_control;
1574 int keyid = rx->sta->ptk_idx;
1576 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1577 cs = rx->sta->cipher_scheme;
1578 keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1579 if (unlikely(keyid < 0))
1580 return RX_DROP_UNUSABLE;
1582 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1585 if (!ieee80211_has_protected(fc))
1586 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1588 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1590 if ((status->flag & RX_FLAG_DECRYPTED) &&
1591 (status->flag & RX_FLAG_IV_STRIPPED))
1593 /* Skip decryption if the frame is not protected. */
1594 if (!ieee80211_has_protected(fc))
1596 } else if (mmie_keyidx >= 0) {
1597 /* Broadcast/multicast robust management frame / BIP */
1598 if ((status->flag & RX_FLAG_DECRYPTED) &&
1599 (status->flag & RX_FLAG_IV_STRIPPED))
1602 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1603 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1604 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1606 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1608 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1609 } else if (!ieee80211_has_protected(fc)) {
1611 * The frame was not protected, so skip decryption. However, we
1612 * need to set rx->key if there is a key that could have been
1613 * used so that the frame may be dropped if encryption would
1614 * have been expected.
1616 struct ieee80211_key *key = NULL;
1617 struct ieee80211_sub_if_data *sdata = rx->sdata;
1620 if (ieee80211_is_mgmt(fc) &&
1621 is_multicast_ether_addr(hdr->addr1) &&
1622 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1626 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1627 key = rcu_dereference(rx->sta->gtk[i]);
1633 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1634 key = rcu_dereference(sdata->keys[i]);
1647 * The device doesn't give us the IV so we won't be
1648 * able to look up the key. That's ok though, we
1649 * don't need to decrypt the frame, we just won't
1650 * be able to keep statistics accurate.
1651 * Except for key threshold notifications, should
1652 * we somehow allow the driver to tell us which key
1653 * the hardware used if this flag is set?
1655 if ((status->flag & RX_FLAG_DECRYPTED) &&
1656 (status->flag & RX_FLAG_IV_STRIPPED))
1659 hdrlen = ieee80211_hdrlen(fc);
1662 keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1664 if (unlikely(keyidx < 0))
1665 return RX_DROP_UNUSABLE;
1667 if (rx->skb->len < 8 + hdrlen)
1668 return RX_DROP_UNUSABLE; /* TODO: count this? */
1670 * no need to call ieee80211_wep_get_keyidx,
1671 * it verifies a bunch of things we've done already
1673 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1674 keyidx = keyid >> 6;
1677 /* check per-station GTK first, if multicast packet */
1678 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1679 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1681 /* if not found, try default key */
1683 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1686 * RSNA-protected unicast frames should always be
1687 * sent with pairwise or station-to-station keys,
1688 * but for WEP we allow using a key index as well.
1691 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1692 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1693 !is_multicast_ether_addr(hdr->addr1))
1699 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1700 return RX_DROP_MONITOR;
1702 /* TODO: add threshold stuff again */
1704 return RX_DROP_MONITOR;
1707 switch (rx->key->conf.cipher) {
1708 case WLAN_CIPHER_SUITE_WEP40:
1709 case WLAN_CIPHER_SUITE_WEP104:
1710 result = ieee80211_crypto_wep_decrypt(rx);
1712 case WLAN_CIPHER_SUITE_TKIP:
1713 result = ieee80211_crypto_tkip_decrypt(rx);
1715 case WLAN_CIPHER_SUITE_CCMP:
1716 result = ieee80211_crypto_ccmp_decrypt(
1717 rx, IEEE80211_CCMP_MIC_LEN);
1719 case WLAN_CIPHER_SUITE_CCMP_256:
1720 result = ieee80211_crypto_ccmp_decrypt(
1721 rx, IEEE80211_CCMP_256_MIC_LEN);
1723 case WLAN_CIPHER_SUITE_AES_CMAC:
1724 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1726 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1727 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1729 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1730 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1731 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1733 case WLAN_CIPHER_SUITE_GCMP:
1734 case WLAN_CIPHER_SUITE_GCMP_256:
1735 result = ieee80211_crypto_gcmp_decrypt(rx);
1738 result = ieee80211_crypto_hw_decrypt(rx);
1741 /* the hdr variable is invalid after the decrypt handlers */
1743 /* either the frame has been decrypted or will be dropped */
1744 status->flag |= RX_FLAG_DECRYPTED;
1749 static inline struct ieee80211_fragment_entry *
1750 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1751 unsigned int frag, unsigned int seq, int rx_queue,
1752 struct sk_buff **skb)
1754 struct ieee80211_fragment_entry *entry;
1756 entry = &sdata->fragments[sdata->fragment_next++];
1757 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1758 sdata->fragment_next = 0;
1760 if (!skb_queue_empty(&entry->skb_list))
1761 __skb_queue_purge(&entry->skb_list);
1763 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1765 entry->first_frag_time = jiffies;
1767 entry->rx_queue = rx_queue;
1768 entry->last_frag = frag;
1769 entry->check_sequential_pn = false;
1770 entry->extra_len = 0;
1775 static inline struct ieee80211_fragment_entry *
1776 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1777 unsigned int frag, unsigned int seq,
1778 int rx_queue, struct ieee80211_hdr *hdr)
1780 struct ieee80211_fragment_entry *entry;
1783 idx = sdata->fragment_next;
1784 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1785 struct ieee80211_hdr *f_hdr;
1789 idx = IEEE80211_FRAGMENT_MAX - 1;
1791 entry = &sdata->fragments[idx];
1792 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1793 entry->rx_queue != rx_queue ||
1794 entry->last_frag + 1 != frag)
1797 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1800 * Check ftype and addresses are equal, else check next fragment
1802 if (((hdr->frame_control ^ f_hdr->frame_control) &
1803 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1804 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1805 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1808 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1809 __skb_queue_purge(&entry->skb_list);
1818 static ieee80211_rx_result debug_noinline
1819 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1821 struct ieee80211_hdr *hdr;
1824 unsigned int frag, seq;
1825 struct ieee80211_fragment_entry *entry;
1826 struct sk_buff *skb;
1827 struct ieee80211_rx_status *status;
1829 hdr = (struct ieee80211_hdr *)rx->skb->data;
1830 fc = hdr->frame_control;
1832 if (ieee80211_is_ctl(fc))
1835 sc = le16_to_cpu(hdr->seq_ctrl);
1836 frag = sc & IEEE80211_SCTL_FRAG;
1838 if (is_multicast_ether_addr(hdr->addr1)) {
1839 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1843 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1846 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1848 if (skb_linearize(rx->skb))
1849 return RX_DROP_UNUSABLE;
1852 * skb_linearize() might change the skb->data and
1853 * previously cached variables (in this case, hdr) need to
1854 * be refreshed with the new data.
1856 hdr = (struct ieee80211_hdr *)rx->skb->data;
1857 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1860 /* This is the first fragment of a new frame. */
1861 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1862 rx->seqno_idx, &(rx->skb));
1864 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1865 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1866 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1867 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
1868 ieee80211_has_protected(fc)) {
1869 int queue = rx->security_idx;
1871 /* Store CCMP/GCMP PN so that we can verify that the
1872 * next fragment has a sequential PN value.
1874 entry->check_sequential_pn = true;
1875 memcpy(entry->last_pn,
1876 rx->key->u.ccmp.rx_pn[queue],
1877 IEEE80211_CCMP_PN_LEN);
1878 BUILD_BUG_ON(offsetof(struct ieee80211_key,
1880 offsetof(struct ieee80211_key,
1882 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
1883 sizeof(rx->key->u.gcmp.rx_pn[queue]));
1884 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
1885 IEEE80211_GCMP_PN_LEN);
1890 /* This is a fragment for a frame that should already be pending in
1891 * fragment cache. Add this fragment to the end of the pending entry.
1893 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1894 rx->seqno_idx, hdr);
1896 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1897 return RX_DROP_MONITOR;
1900 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
1901 * MPDU PN values are not incrementing in steps of 1."
1902 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
1903 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
1905 if (entry->check_sequential_pn) {
1907 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1911 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1912 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
1913 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
1914 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
1915 return RX_DROP_UNUSABLE;
1916 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1917 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1922 queue = rx->security_idx;
1923 rpn = rx->key->u.ccmp.rx_pn[queue];
1924 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1925 return RX_DROP_UNUSABLE;
1926 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1929 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1930 __skb_queue_tail(&entry->skb_list, rx->skb);
1931 entry->last_frag = frag;
1932 entry->extra_len += rx->skb->len;
1933 if (ieee80211_has_morefrags(fc)) {
1938 rx->skb = __skb_dequeue(&entry->skb_list);
1939 if (skb_tailroom(rx->skb) < entry->extra_len) {
1940 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
1941 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1943 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1944 __skb_queue_purge(&entry->skb_list);
1945 return RX_DROP_UNUSABLE;
1948 while ((skb = __skb_dequeue(&entry->skb_list))) {
1949 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1953 /* Complete frame has been reassembled - process it now */
1954 status = IEEE80211_SKB_RXCB(rx->skb);
1957 ieee80211_led_rx(rx->local);
1960 rx->sta->rx_stats.packets++;
1964 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1966 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1972 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1974 struct sk_buff *skb = rx->skb;
1975 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1978 * Pass through unencrypted frames if the hardware has
1979 * decrypted them already.
1981 if (status->flag & RX_FLAG_DECRYPTED)
1984 /* Drop unencrypted frames if key is set. */
1985 if (unlikely(!ieee80211_has_protected(fc) &&
1986 !ieee80211_is_nullfunc(fc) &&
1987 ieee80211_is_data(fc) && rx->key))
1993 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1995 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1996 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1997 __le16 fc = hdr->frame_control;
2000 * Pass through unencrypted frames if the hardware has
2001 * decrypted them already.
2003 if (status->flag & RX_FLAG_DECRYPTED)
2006 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2007 if (unlikely(!ieee80211_has_protected(fc) &&
2008 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2010 if (ieee80211_is_deauth(fc) ||
2011 ieee80211_is_disassoc(fc))
2012 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2017 /* BIP does not use Protected field, so need to check MMIE */
2018 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2019 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2020 if (ieee80211_is_deauth(fc) ||
2021 ieee80211_is_disassoc(fc))
2022 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2028 * When using MFP, Action frames are not allowed prior to
2029 * having configured keys.
2031 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2032 ieee80211_is_robust_mgmt_frame(rx->skb)))
2040 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2042 struct ieee80211_sub_if_data *sdata = rx->sdata;
2043 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2044 bool check_port_control = false;
2045 struct ethhdr *ehdr;
2048 *port_control = false;
2049 if (ieee80211_has_a4(hdr->frame_control) &&
2050 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2053 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2054 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2056 if (!sdata->u.mgd.use_4addr)
2059 check_port_control = true;
2062 if (is_multicast_ether_addr(hdr->addr1) &&
2063 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2066 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2070 ehdr = (struct ethhdr *) rx->skb->data;
2071 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2072 *port_control = true;
2073 else if (check_port_control)
2080 * requires that rx->skb is a frame with ethernet header
2082 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2084 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2085 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2086 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2089 * Allow EAPOL frames to us/the PAE group address regardless
2090 * of whether the frame was encrypted or not.
2092 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2093 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2094 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2097 if (ieee80211_802_1x_port_control(rx) ||
2098 ieee80211_drop_unencrypted(rx, fc))
2105 * requires that rx->skb is a frame with ethernet header
2108 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2110 struct ieee80211_sub_if_data *sdata = rx->sdata;
2111 struct net_device *dev = sdata->dev;
2112 struct sk_buff *skb, *xmit_skb;
2113 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2114 struct sta_info *dsta;
2119 ieee80211_rx_stats(dev, skb->len);
2122 /* The seqno index has the same property as needed
2123 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2124 * for non-QoS-data frames. Here we know it's a data
2125 * frame, so count MSDUs.
2127 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2130 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2131 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2132 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2133 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2134 if (is_multicast_ether_addr(ehdr->h_dest)) {
2136 * send multicast frames both to higher layers in
2137 * local net stack and back to the wireless medium
2139 xmit_skb = skb_copy(skb, GFP_ATOMIC);
2141 net_info_ratelimited("%s: failed to clone multicast frame\n",
2144 dsta = sta_info_get(sdata, skb->data);
2147 * The destination station is associated to
2148 * this AP (in this VLAN), so send the frame
2149 * directly to it and do not pass it to local
2158 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2160 /* 'align' will only take the values 0 or 2 here since all
2161 * frames are required to be aligned to 2-byte boundaries
2162 * when being passed to mac80211; the code here works just
2163 * as well if that isn't true, but mac80211 assumes it can
2164 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2168 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2170 if (WARN_ON(skb_headroom(skb) < 3)) {
2174 u8 *data = skb->data;
2175 size_t len = skb_headlen(skb);
2177 memmove(skb->data, data, len);
2178 skb_set_tail_pointer(skb, len);
2185 /* deliver to local stack */
2186 skb->protocol = eth_type_trans(skb, dev);
2187 memset(skb->cb, 0, sizeof(skb->cb));
2189 napi_gro_receive(rx->napi, skb);
2191 netif_receive_skb(skb);
2196 * Send to wireless media and increase priority by 256 to
2197 * keep the received priority instead of reclassifying
2198 * the frame (see cfg80211_classify8021d).
2200 xmit_skb->priority += 256;
2201 xmit_skb->protocol = htons(ETH_P_802_3);
2202 skb_reset_network_header(xmit_skb);
2203 skb_reset_mac_header(xmit_skb);
2204 dev_queue_xmit(xmit_skb);
2208 static ieee80211_rx_result debug_noinline
2209 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2211 struct net_device *dev = rx->sdata->dev;
2212 struct sk_buff *skb = rx->skb;
2213 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2214 __le16 fc = hdr->frame_control;
2215 struct sk_buff_head frame_list;
2216 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2218 if (unlikely(!ieee80211_is_data(fc)))
2221 if (unlikely(!ieee80211_is_data_present(fc)))
2222 return RX_DROP_MONITOR;
2224 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2227 if (ieee80211_has_a4(hdr->frame_control) &&
2228 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2229 !rx->sdata->u.vlan.sta)
2230 return RX_DROP_UNUSABLE;
2232 if (is_multicast_ether_addr(hdr->addr1) &&
2233 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2234 rx->sdata->u.vlan.sta) ||
2235 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2236 rx->sdata->u.mgd.use_4addr)))
2237 return RX_DROP_UNUSABLE;
2240 __skb_queue_head_init(&frame_list);
2242 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2243 rx->sdata->vif.type,
2244 rx->local->hw.extra_tx_headroom, true);
2246 while (!skb_queue_empty(&frame_list)) {
2247 rx->skb = __skb_dequeue(&frame_list);
2249 if (!ieee80211_frame_allowed(rx, fc)) {
2250 dev_kfree_skb(rx->skb);
2254 ieee80211_deliver_skb(rx);
2260 #ifdef CONFIG_MAC80211_MESH
2261 static ieee80211_rx_result
2262 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2264 struct ieee80211_hdr *fwd_hdr, *hdr;
2265 struct ieee80211_tx_info *info;
2266 struct ieee80211s_hdr *mesh_hdr;
2267 struct sk_buff *skb = rx->skb, *fwd_skb;
2268 struct ieee80211_local *local = rx->local;
2269 struct ieee80211_sub_if_data *sdata = rx->sdata;
2270 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2273 hdr = (struct ieee80211_hdr *) skb->data;
2274 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2276 /* make sure fixed part of mesh header is there, also checks skb len */
2277 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2278 return RX_DROP_MONITOR;
2280 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2282 /* make sure full mesh header is there, also checks skb len */
2283 if (!pskb_may_pull(rx->skb,
2284 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2285 return RX_DROP_MONITOR;
2287 /* reload pointers */
2288 hdr = (struct ieee80211_hdr *) skb->data;
2289 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2291 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2292 return RX_DROP_MONITOR;
2294 /* frame is in RMC, don't forward */
2295 if (ieee80211_is_data(hdr->frame_control) &&
2296 is_multicast_ether_addr(hdr->addr1) &&
2297 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2298 return RX_DROP_MONITOR;
2300 if (!ieee80211_is_data(hdr->frame_control))
2304 return RX_DROP_MONITOR;
2306 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2307 struct mesh_path *mppath;
2311 if (is_multicast_ether_addr(hdr->addr1)) {
2312 mpp_addr = hdr->addr3;
2313 proxied_addr = mesh_hdr->eaddr1;
2314 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2315 /* has_a4 already checked in ieee80211_rx_mesh_check */
2316 mpp_addr = hdr->addr4;
2317 proxied_addr = mesh_hdr->eaddr2;
2319 return RX_DROP_MONITOR;
2323 mppath = mpp_path_lookup(sdata, proxied_addr);
2325 mpp_path_add(sdata, proxied_addr, mpp_addr);
2327 spin_lock_bh(&mppath->state_lock);
2328 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2329 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2330 mppath->exp_time = jiffies;
2331 spin_unlock_bh(&mppath->state_lock);
2336 /* Frame has reached destination. Don't forward */
2337 if (!is_multicast_ether_addr(hdr->addr1) &&
2338 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2341 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2342 q = sdata->vif.hw_queue[ac];
2343 if (ieee80211_queue_stopped(&local->hw, q)) {
2344 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2345 return RX_DROP_MONITOR;
2347 skb_set_queue_mapping(skb, q);
2349 if (!--mesh_hdr->ttl) {
2350 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2354 if (!ifmsh->mshcfg.dot11MeshForwarding)
2357 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2359 net_info_ratelimited("%s: failed to clone mesh frame\n",
2364 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2365 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2366 info = IEEE80211_SKB_CB(fwd_skb);
2367 memset(info, 0, sizeof(*info));
2368 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2369 info->control.vif = &rx->sdata->vif;
2370 info->control.jiffies = jiffies;
2371 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2372 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2373 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2374 /* update power mode indication when forwarding */
2375 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2376 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2377 /* mesh power mode flags updated in mesh_nexthop_lookup */
2378 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2380 /* unable to resolve next hop */
2381 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2383 WLAN_REASON_MESH_PATH_NOFORWARD,
2385 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2387 return RX_DROP_MONITOR;
2390 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2391 ieee80211_add_pending_skb(local, fwd_skb);
2393 if (is_multicast_ether_addr(hdr->addr1))
2395 return RX_DROP_MONITOR;
2399 static ieee80211_rx_result debug_noinline
2400 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2402 struct ieee80211_sub_if_data *sdata = rx->sdata;
2403 struct ieee80211_local *local = rx->local;
2404 struct net_device *dev = sdata->dev;
2405 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2406 __le16 fc = hdr->frame_control;
2410 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2413 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2414 return RX_DROP_MONITOR;
2417 * Send unexpected-4addr-frame event to hostapd. For older versions,
2418 * also drop the frame to cooked monitor interfaces.
2420 if (ieee80211_has_a4(hdr->frame_control) &&
2421 sdata->vif.type == NL80211_IFTYPE_AP) {
2423 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2424 cfg80211_rx_unexpected_4addr_frame(
2425 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2426 return RX_DROP_MONITOR;
2429 err = __ieee80211_data_to_8023(rx, &port_control);
2431 return RX_DROP_UNUSABLE;
2433 if (!ieee80211_frame_allowed(rx, fc))
2434 return RX_DROP_MONITOR;
2436 /* directly handle TDLS channel switch requests/responses */
2437 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2438 cpu_to_be16(ETH_P_TDLS))) {
2439 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2441 if (pskb_may_pull(rx->skb,
2442 offsetof(struct ieee80211_tdls_data, u)) &&
2443 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2444 tf->category == WLAN_CATEGORY_TDLS &&
2445 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2446 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2447 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2448 schedule_work(&local->tdls_chsw_work);
2450 rx->sta->rx_stats.packets++;
2456 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2457 unlikely(port_control) && sdata->bss) {
2458 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2466 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2467 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2468 !is_multicast_ether_addr(
2469 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2470 (!local->scanning &&
2471 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2472 mod_timer(&local->dynamic_ps_timer, jiffies +
2473 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2475 ieee80211_deliver_skb(rx);
2480 static ieee80211_rx_result debug_noinline
2481 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2483 struct sk_buff *skb = rx->skb;
2484 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2485 struct tid_ampdu_rx *tid_agg_rx;
2489 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2492 if (ieee80211_is_back_req(bar->frame_control)) {
2494 __le16 control, start_seq_num;
2495 } __packed bar_data;
2496 struct ieee80211_event event = {
2497 .type = BAR_RX_EVENT,
2501 return RX_DROP_MONITOR;
2503 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2504 &bar_data, sizeof(bar_data)))
2505 return RX_DROP_MONITOR;
2507 tid = le16_to_cpu(bar_data.control) >> 12;
2509 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2511 return RX_DROP_MONITOR;
2513 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2514 event.u.ba.tid = tid;
2515 event.u.ba.ssn = start_seq_num;
2516 event.u.ba.sta = &rx->sta->sta;
2518 /* reset session timer */
2519 if (tid_agg_rx->timeout)
2520 mod_timer(&tid_agg_rx->session_timer,
2521 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2523 spin_lock(&tid_agg_rx->reorder_lock);
2524 /* release stored frames up to start of BAR */
2525 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2526 start_seq_num, frames);
2527 spin_unlock(&tid_agg_rx->reorder_lock);
2529 drv_event_callback(rx->local, rx->sdata, &event);
2536 * After this point, we only want management frames,
2537 * so we can drop all remaining control frames to
2538 * cooked monitor interfaces.
2540 return RX_DROP_MONITOR;
2543 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2544 struct ieee80211_mgmt *mgmt,
2547 struct ieee80211_local *local = sdata->local;
2548 struct sk_buff *skb;
2549 struct ieee80211_mgmt *resp;
2551 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2552 /* Not to own unicast address */
2556 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2557 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2558 /* Not from the current AP or not associated yet. */
2562 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2563 /* Too short SA Query request frame */
2567 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2571 skb_reserve(skb, local->hw.extra_tx_headroom);
2572 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2573 memset(resp, 0, 24);
2574 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2575 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2576 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2577 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2578 IEEE80211_STYPE_ACTION);
2579 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2580 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2581 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2582 memcpy(resp->u.action.u.sa_query.trans_id,
2583 mgmt->u.action.u.sa_query.trans_id,
2584 WLAN_SA_QUERY_TR_ID_LEN);
2586 ieee80211_tx_skb(sdata, skb);
2589 static ieee80211_rx_result debug_noinline
2590 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2592 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2593 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2596 * From here on, look only at management frames.
2597 * Data and control frames are already handled,
2598 * and unknown (reserved) frames are useless.
2600 if (rx->skb->len < 24)
2601 return RX_DROP_MONITOR;
2603 if (!ieee80211_is_mgmt(mgmt->frame_control))
2604 return RX_DROP_MONITOR;
2606 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2607 ieee80211_is_beacon(mgmt->frame_control) &&
2608 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2611 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2612 sig = status->signal;
2614 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2615 rx->skb->data, rx->skb->len,
2617 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2620 if (ieee80211_drop_unencrypted_mgmt(rx))
2621 return RX_DROP_UNUSABLE;
2626 static ieee80211_rx_result debug_noinline
2627 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2629 struct ieee80211_local *local = rx->local;
2630 struct ieee80211_sub_if_data *sdata = rx->sdata;
2631 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2632 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2633 int len = rx->skb->len;
2635 if (!ieee80211_is_action(mgmt->frame_control))
2638 /* drop too small frames */
2639 if (len < IEEE80211_MIN_ACTION_SIZE)
2640 return RX_DROP_UNUSABLE;
2642 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2643 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2644 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2645 return RX_DROP_UNUSABLE;
2647 switch (mgmt->u.action.category) {
2648 case WLAN_CATEGORY_HT:
2649 /* reject HT action frames from stations not supporting HT */
2650 if (!rx->sta->sta.ht_cap.ht_supported)
2653 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2654 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2655 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2656 sdata->vif.type != NL80211_IFTYPE_AP &&
2657 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2660 /* verify action & smps_control/chanwidth are present */
2661 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2664 switch (mgmt->u.action.u.ht_smps.action) {
2665 case WLAN_HT_ACTION_SMPS: {
2666 struct ieee80211_supported_band *sband;
2667 enum ieee80211_smps_mode smps_mode;
2669 /* convert to HT capability */
2670 switch (mgmt->u.action.u.ht_smps.smps_control) {
2671 case WLAN_HT_SMPS_CONTROL_DISABLED:
2672 smps_mode = IEEE80211_SMPS_OFF;
2674 case WLAN_HT_SMPS_CONTROL_STATIC:
2675 smps_mode = IEEE80211_SMPS_STATIC;
2677 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2678 smps_mode = IEEE80211_SMPS_DYNAMIC;
2684 /* if no change do nothing */
2685 if (rx->sta->sta.smps_mode == smps_mode)
2687 rx->sta->sta.smps_mode = smps_mode;
2689 sband = rx->local->hw.wiphy->bands[status->band];
2691 rate_control_rate_update(local, sband, rx->sta,
2692 IEEE80211_RC_SMPS_CHANGED);
2695 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2696 struct ieee80211_supported_band *sband;
2697 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2698 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2700 /* If it doesn't support 40 MHz it can't change ... */
2701 if (!(rx->sta->sta.ht_cap.cap &
2702 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2705 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2706 max_bw = IEEE80211_STA_RX_BW_20;
2708 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2710 /* set cur_max_bandwidth and recalc sta bw */
2711 rx->sta->cur_max_bandwidth = max_bw;
2712 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2714 if (rx->sta->sta.bandwidth == new_bw)
2717 rx->sta->sta.bandwidth = new_bw;
2718 sband = rx->local->hw.wiphy->bands[status->band];
2720 rate_control_rate_update(local, sband, rx->sta,
2721 IEEE80211_RC_BW_CHANGED);
2729 case WLAN_CATEGORY_PUBLIC:
2730 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2732 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2736 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2738 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2739 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2741 if (len < offsetof(struct ieee80211_mgmt,
2742 u.action.u.ext_chan_switch.variable))
2745 case WLAN_CATEGORY_VHT:
2746 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2747 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2748 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2749 sdata->vif.type != NL80211_IFTYPE_AP &&
2750 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2753 /* verify action code is present */
2754 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2757 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2758 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2761 /* verify opmode is present */
2762 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2765 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2767 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2768 opmode, status->band);
2771 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2772 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2780 case WLAN_CATEGORY_BACK:
2781 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2782 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2783 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2784 sdata->vif.type != NL80211_IFTYPE_AP &&
2785 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2788 /* verify action_code is present */
2789 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2792 switch (mgmt->u.action.u.addba_req.action_code) {
2793 case WLAN_ACTION_ADDBA_REQ:
2794 if (len < (IEEE80211_MIN_ACTION_SIZE +
2795 sizeof(mgmt->u.action.u.addba_req)))
2798 case WLAN_ACTION_ADDBA_RESP:
2799 if (len < (IEEE80211_MIN_ACTION_SIZE +
2800 sizeof(mgmt->u.action.u.addba_resp)))
2803 case WLAN_ACTION_DELBA:
2804 if (len < (IEEE80211_MIN_ACTION_SIZE +
2805 sizeof(mgmt->u.action.u.delba)))
2813 case WLAN_CATEGORY_SPECTRUM_MGMT:
2814 /* verify action_code is present */
2815 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2818 switch (mgmt->u.action.u.measurement.action_code) {
2819 case WLAN_ACTION_SPCT_MSR_REQ:
2820 if (status->band != IEEE80211_BAND_5GHZ)
2823 if (len < (IEEE80211_MIN_ACTION_SIZE +
2824 sizeof(mgmt->u.action.u.measurement)))
2827 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2830 ieee80211_process_measurement_req(sdata, mgmt, len);
2832 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2834 if (len < (IEEE80211_MIN_ACTION_SIZE +
2835 sizeof(mgmt->u.action.u.chan_switch)))
2838 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2839 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2840 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2843 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2844 bssid = sdata->u.mgd.bssid;
2845 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2846 bssid = sdata->u.ibss.bssid;
2847 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2852 if (!ether_addr_equal(mgmt->bssid, bssid))
2859 case WLAN_CATEGORY_SA_QUERY:
2860 if (len < (IEEE80211_MIN_ACTION_SIZE +
2861 sizeof(mgmt->u.action.u.sa_query)))
2864 switch (mgmt->u.action.u.sa_query.action) {
2865 case WLAN_ACTION_SA_QUERY_REQUEST:
2866 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2868 ieee80211_process_sa_query_req(sdata, mgmt, len);
2872 case WLAN_CATEGORY_SELF_PROTECTED:
2873 if (len < (IEEE80211_MIN_ACTION_SIZE +
2874 sizeof(mgmt->u.action.u.self_prot.action_code)))
2877 switch (mgmt->u.action.u.self_prot.action_code) {
2878 case WLAN_SP_MESH_PEERING_OPEN:
2879 case WLAN_SP_MESH_PEERING_CLOSE:
2880 case WLAN_SP_MESH_PEERING_CONFIRM:
2881 if (!ieee80211_vif_is_mesh(&sdata->vif))
2883 if (sdata->u.mesh.user_mpm)
2884 /* userspace handles this frame */
2887 case WLAN_SP_MGK_INFORM:
2888 case WLAN_SP_MGK_ACK:
2889 if (!ieee80211_vif_is_mesh(&sdata->vif))
2894 case WLAN_CATEGORY_MESH_ACTION:
2895 if (len < (IEEE80211_MIN_ACTION_SIZE +
2896 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2899 if (!ieee80211_vif_is_mesh(&sdata->vif))
2901 if (mesh_action_is_path_sel(mgmt) &&
2902 !mesh_path_sel_is_hwmp(sdata))
2910 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2911 /* will return in the next handlers */
2916 rx->sta->rx_stats.packets++;
2917 dev_kfree_skb(rx->skb);
2921 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2922 skb_queue_tail(&sdata->skb_queue, rx->skb);
2923 ieee80211_queue_work(&local->hw, &sdata->work);
2925 rx->sta->rx_stats.packets++;
2929 static ieee80211_rx_result debug_noinline
2930 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2932 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2935 /* skip known-bad action frames and return them in the next handler */
2936 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2940 * Getting here means the kernel doesn't know how to handle
2941 * it, but maybe userspace does ... include returned frames
2942 * so userspace can register for those to know whether ones
2943 * it transmitted were processed or returned.
2946 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2947 sig = status->signal;
2949 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2950 rx->skb->data, rx->skb->len, 0)) {
2952 rx->sta->rx_stats.packets++;
2953 dev_kfree_skb(rx->skb);
2960 static ieee80211_rx_result debug_noinline
2961 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2963 struct ieee80211_local *local = rx->local;
2964 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2965 struct sk_buff *nskb;
2966 struct ieee80211_sub_if_data *sdata = rx->sdata;
2967 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2969 if (!ieee80211_is_action(mgmt->frame_control))
2973 * For AP mode, hostapd is responsible for handling any action
2974 * frames that we didn't handle, including returning unknown
2975 * ones. For all other modes we will return them to the sender,
2976 * setting the 0x80 bit in the action category, as required by
2977 * 802.11-2012 9.24.4.
2978 * Newer versions of hostapd shall also use the management frame
2979 * registration mechanisms, but older ones still use cooked
2980 * monitor interfaces so push all frames there.
2982 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2983 (sdata->vif.type == NL80211_IFTYPE_AP ||
2984 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2985 return RX_DROP_MONITOR;
2987 if (is_multicast_ether_addr(mgmt->da))
2988 return RX_DROP_MONITOR;
2990 /* do not return rejected action frames */
2991 if (mgmt->u.action.category & 0x80)
2992 return RX_DROP_UNUSABLE;
2994 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2997 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2999 nmgmt->u.action.category |= 0x80;
3000 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3001 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3003 memset(nskb->cb, 0, sizeof(nskb->cb));
3005 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3006 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3008 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3009 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3010 IEEE80211_TX_CTL_NO_CCK_RATE;
3011 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3013 local->hw.offchannel_tx_hw_queue;
3016 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3019 dev_kfree_skb(rx->skb);
3023 static ieee80211_rx_result debug_noinline
3024 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3026 struct ieee80211_sub_if_data *sdata = rx->sdata;
3027 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3030 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3032 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3033 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3034 sdata->vif.type != NL80211_IFTYPE_OCB &&
3035 sdata->vif.type != NL80211_IFTYPE_STATION)
3036 return RX_DROP_MONITOR;
3039 case cpu_to_le16(IEEE80211_STYPE_AUTH):
3040 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3041 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3042 /* process for all: mesh, mlme, ibss */
3044 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3045 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3046 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3047 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3048 if (is_multicast_ether_addr(mgmt->da) &&
3049 !is_broadcast_ether_addr(mgmt->da))
3050 return RX_DROP_MONITOR;
3052 /* process only for station */
3053 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3054 return RX_DROP_MONITOR;
3056 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3057 /* process only for ibss and mesh */
3058 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3059 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3060 return RX_DROP_MONITOR;
3063 return RX_DROP_MONITOR;
3066 /* queue up frame and kick off work to process it */
3067 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3068 skb_queue_tail(&sdata->skb_queue, rx->skb);
3069 ieee80211_queue_work(&rx->local->hw, &sdata->work);
3071 rx->sta->rx_stats.packets++;
3076 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3077 struct ieee80211_rate *rate)
3079 struct ieee80211_sub_if_data *sdata;
3080 struct ieee80211_local *local = rx->local;
3081 struct sk_buff *skb = rx->skb, *skb2;
3082 struct net_device *prev_dev = NULL;
3083 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3084 int needed_headroom;
3087 * If cooked monitor has been processed already, then
3088 * don't do it again. If not, set the flag.
3090 if (rx->flags & IEEE80211_RX_CMNTR)
3092 rx->flags |= IEEE80211_RX_CMNTR;
3094 /* If there are no cooked monitor interfaces, just free the SKB */
3095 if (!local->cooked_mntrs)
3098 /* vendor data is long removed here */
3099 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3100 /* room for the radiotap header based on driver features */
3101 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3103 if (skb_headroom(skb) < needed_headroom &&
3104 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3107 /* prepend radiotap information */
3108 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3111 skb_reset_mac_header(skb);
3112 skb->ip_summed = CHECKSUM_UNNECESSARY;
3113 skb->pkt_type = PACKET_OTHERHOST;
3114 skb->protocol = htons(ETH_P_802_2);
3116 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3117 if (!ieee80211_sdata_running(sdata))
3120 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3121 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3125 skb2 = skb_clone(skb, GFP_ATOMIC);
3127 skb2->dev = prev_dev;
3128 netif_receive_skb(skb2);
3132 prev_dev = sdata->dev;
3133 ieee80211_rx_stats(sdata->dev, skb->len);
3137 skb->dev = prev_dev;
3138 netif_receive_skb(skb);
3146 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3147 ieee80211_rx_result res)
3150 case RX_DROP_MONITOR:
3151 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3153 rx->sta->rx_stats.dropped++;
3156 struct ieee80211_rate *rate = NULL;
3157 struct ieee80211_supported_band *sband;
3158 struct ieee80211_rx_status *status;
3160 status = IEEE80211_SKB_RXCB((rx->skb));
3162 sband = rx->local->hw.wiphy->bands[status->band];
3163 if (!(status->flag & RX_FLAG_HT) &&
3164 !(status->flag & RX_FLAG_VHT))
3165 rate = &sband->bitrates[status->rate_idx];
3167 ieee80211_rx_cooked_monitor(rx, rate);
3170 case RX_DROP_UNUSABLE:
3171 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3173 rx->sta->rx_stats.dropped++;
3174 dev_kfree_skb(rx->skb);
3177 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3182 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3183 struct sk_buff_head *frames)
3185 ieee80211_rx_result res = RX_DROP_MONITOR;
3186 struct sk_buff *skb;
3188 #define CALL_RXH(rxh) \
3191 if (res != RX_CONTINUE) \
3195 /* Lock here to avoid hitting all of the data used in the RX
3196 * path (e.g. key data, station data, ...) concurrently when
3197 * a frame is released from the reorder buffer due to timeout
3198 * from the timer, potentially concurrently with RX from the
3201 spin_lock_bh(&rx->local->rx_path_lock);
3203 while ((skb = __skb_dequeue(frames))) {
3205 * all the other fields are valid across frames
3206 * that belong to an aMPDU since they are on the
3207 * same TID from the same station
3211 CALL_RXH(ieee80211_rx_h_check_more_data);
3212 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3213 CALL_RXH(ieee80211_rx_h_sta_process);
3214 CALL_RXH(ieee80211_rx_h_decrypt);
3215 CALL_RXH(ieee80211_rx_h_defragment);
3216 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3217 /* must be after MMIC verify so header is counted in MPDU mic */
3218 #ifdef CONFIG_MAC80211_MESH
3219 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3220 CALL_RXH(ieee80211_rx_h_mesh_fwding);
3222 CALL_RXH(ieee80211_rx_h_amsdu);
3223 CALL_RXH(ieee80211_rx_h_data);
3225 /* special treatment -- needs the queue */
3226 res = ieee80211_rx_h_ctrl(rx, frames);
3227 if (res != RX_CONTINUE)
3230 CALL_RXH(ieee80211_rx_h_mgmt_check);
3231 CALL_RXH(ieee80211_rx_h_action);
3232 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3233 CALL_RXH(ieee80211_rx_h_action_return);
3234 CALL_RXH(ieee80211_rx_h_mgmt);
3237 ieee80211_rx_handlers_result(rx, res);
3242 spin_unlock_bh(&rx->local->rx_path_lock);
3245 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3247 struct sk_buff_head reorder_release;
3248 ieee80211_rx_result res = RX_DROP_MONITOR;
3250 __skb_queue_head_init(&reorder_release);
3252 #define CALL_RXH(rxh) \
3255 if (res != RX_CONTINUE) \
3259 CALL_RXH(ieee80211_rx_h_check_dup);
3260 CALL_RXH(ieee80211_rx_h_check);
3262 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3264 ieee80211_rx_handlers(rx, &reorder_release);
3268 ieee80211_rx_handlers_result(rx, res);
3274 * This function makes calls into the RX path, therefore
3275 * it has to be invoked under RCU read lock.
3277 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3279 struct sk_buff_head frames;
3280 struct ieee80211_rx_data rx = {
3282 .sdata = sta->sdata,
3283 .local = sta->local,
3284 /* This is OK -- must be QoS data frame */
3285 .security_idx = tid,
3287 .napi = NULL, /* must be NULL to not have races */
3289 struct tid_ampdu_rx *tid_agg_rx;
3291 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3295 __skb_queue_head_init(&frames);
3297 spin_lock(&tid_agg_rx->reorder_lock);
3298 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3299 spin_unlock(&tid_agg_rx->reorder_lock);
3301 if (!skb_queue_empty(&frames)) {
3302 struct ieee80211_event event = {
3303 .type = BA_FRAME_TIMEOUT,
3305 .u.ba.sta = &sta->sta,
3307 drv_event_callback(rx.local, rx.sdata, &event);
3310 ieee80211_rx_handlers(&rx, &frames);
3313 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3314 u16 ssn, u64 filtered,
3317 struct sta_info *sta;
3318 struct tid_ampdu_rx *tid_agg_rx;
3319 struct sk_buff_head frames;
3320 struct ieee80211_rx_data rx = {
3321 /* This is OK -- must be QoS data frame */
3322 .security_idx = tid,
3327 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3330 __skb_queue_head_init(&frames);
3332 sta = container_of(pubsta, struct sta_info, sta);
3335 rx.sdata = sta->sdata;
3336 rx.local = sta->local;
3339 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3343 spin_lock_bh(&tid_agg_rx->reorder_lock);
3345 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3348 /* release all frames in the reorder buffer */
3349 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3350 IEEE80211_SN_MODULO;
3351 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3353 /* update ssn to match received ssn */
3354 tid_agg_rx->head_seq_num = ssn;
3356 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3360 /* handle the case that received ssn is behind the mac ssn.
3361 * it can be tid_agg_rx->buf_size behind and still be valid */
3362 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3363 if (diff >= tid_agg_rx->buf_size) {
3364 tid_agg_rx->reorder_buf_filtered = 0;
3367 filtered = filtered >> diff;
3371 for (i = 0; i < tid_agg_rx->buf_size; i++) {
3372 int index = (ssn + i) % tid_agg_rx->buf_size;
3374 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3375 if (filtered & BIT_ULL(i))
3376 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3379 /* now process also frames that the filter marking released */
3380 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3383 spin_unlock_bh(&tid_agg_rx->reorder_lock);
3385 ieee80211_rx_handlers(&rx, &frames);
3390 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3392 /* main receive path */
3394 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3396 struct ieee80211_sub_if_data *sdata = rx->sdata;
3397 struct sk_buff *skb = rx->skb;
3398 struct ieee80211_hdr *hdr = (void *)skb->data;
3399 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3400 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3401 int multicast = is_multicast_ether_addr(hdr->addr1);
3403 switch (sdata->vif.type) {
3404 case NL80211_IFTYPE_STATION:
3405 if (!bssid && !sdata->u.mgd.use_4addr)
3409 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3410 case NL80211_IFTYPE_ADHOC:
3413 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3414 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3416 if (ieee80211_is_beacon(hdr->frame_control))
3418 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3421 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3425 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3426 rate_idx = 0; /* TODO: HT/VHT rates */
3428 rate_idx = status->rate_idx;
3429 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3433 case NL80211_IFTYPE_OCB:
3436 if (!ieee80211_is_data_present(hdr->frame_control))
3438 if (!is_broadcast_ether_addr(bssid))
3441 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3445 if (status->flag & RX_FLAG_HT)
3446 rate_idx = 0; /* TODO: HT rates */
3448 rate_idx = status->rate_idx;
3449 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3453 case NL80211_IFTYPE_MESH_POINT:
3456 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3457 case NL80211_IFTYPE_AP_VLAN:
3458 case NL80211_IFTYPE_AP:
3460 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3462 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3464 * Accept public action frames even when the
3465 * BSSID doesn't match, this is used for P2P
3466 * and location updates. Note that mac80211
3467 * itself never looks at these frames.
3470 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3472 if (ieee80211_is_public_action(hdr, skb->len))
3474 return ieee80211_is_beacon(hdr->frame_control);
3477 if (!ieee80211_has_tods(hdr->frame_control)) {
3478 /* ignore data frames to TDLS-peers */
3479 if (ieee80211_is_data(hdr->frame_control))
3481 /* ignore action frames to TDLS-peers */
3482 if (ieee80211_is_action(hdr->frame_control) &&
3483 !is_broadcast_ether_addr(bssid) &&
3484 !ether_addr_equal(bssid, hdr->addr1))
3488 case NL80211_IFTYPE_WDS:
3489 if (bssid || !ieee80211_is_data(hdr->frame_control))
3491 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3492 case NL80211_IFTYPE_P2P_DEVICE:
3493 return ieee80211_is_public_action(hdr, skb->len) ||
3494 ieee80211_is_probe_req(hdr->frame_control) ||
3495 ieee80211_is_probe_resp(hdr->frame_control) ||
3496 ieee80211_is_beacon(hdr->frame_control);
3506 * This function returns whether or not the SKB
3507 * was destined for RX processing or not, which,
3508 * if consume is true, is equivalent to whether
3509 * or not the skb was consumed.
3511 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3512 struct sk_buff *skb, bool consume)
3514 struct ieee80211_local *local = rx->local;
3515 struct ieee80211_sub_if_data *sdata = rx->sdata;
3519 if (!ieee80211_accept_frame(rx))
3523 skb = skb_copy(skb, GFP_ATOMIC);
3525 if (net_ratelimit())
3526 wiphy_debug(local->hw.wiphy,
3527 "failed to copy skb for %s\n",
3535 ieee80211_invoke_rx_handlers(rx);
3540 * This is the actual Rx frames handler. as it belongs to Rx path it must
3541 * be called with rcu_read_lock protection.
3543 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3544 struct ieee80211_sta *pubsta,
3545 struct sk_buff *skb,
3546 struct napi_struct *napi)
3548 struct ieee80211_local *local = hw_to_local(hw);
3549 struct ieee80211_sub_if_data *sdata;
3550 struct ieee80211_hdr *hdr;
3552 struct ieee80211_rx_data rx;
3553 struct ieee80211_sub_if_data *prev;
3554 struct rhash_head *tmp;
3557 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3558 memset(&rx, 0, sizeof(rx));
3563 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3564 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
3566 if (ieee80211_is_mgmt(fc)) {
3567 /* drop frame if too short for header */
3568 if (skb->len < ieee80211_hdrlen(fc))
3571 err = skb_linearize(skb);
3573 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3581 hdr = (struct ieee80211_hdr *)skb->data;
3582 ieee80211_parse_qos(&rx);
3583 ieee80211_verify_alignment(&rx);
3585 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3586 ieee80211_is_beacon(hdr->frame_control)))
3587 ieee80211_scan_rx(local, skb);
3590 rx.sta = container_of(pubsta, struct sta_info, sta);
3591 rx.sdata = rx.sta->sdata;
3592 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3595 } else if (ieee80211_is_data(fc)) {
3596 struct sta_info *sta, *prev_sta;
3597 const struct bucket_table *tbl;
3601 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
3603 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
3610 rx.sdata = prev_sta->sdata;
3611 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3618 rx.sdata = prev_sta->sdata;
3620 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3628 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3629 if (!ieee80211_sdata_running(sdata))
3632 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3633 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3637 * frame is destined for this interface, but if it's
3638 * not also for the previous one we handle that after
3639 * the loop to avoid copying the SKB once too much
3647 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3649 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3655 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3658 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3667 * This is the receive path handler. It is called by a low level driver when an
3668 * 802.11 MPDU is received from the hardware.
3670 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
3671 struct sk_buff *skb, struct napi_struct *napi)
3673 struct ieee80211_local *local = hw_to_local(hw);
3674 struct ieee80211_rate *rate = NULL;
3675 struct ieee80211_supported_band *sband;
3676 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3678 WARN_ON_ONCE(softirq_count() == 0);
3680 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3683 sband = local->hw.wiphy->bands[status->band];
3684 if (WARN_ON(!sband))
3688 * If we're suspending, it is possible although not too likely
3689 * that we'd be receiving frames after having already partially
3690 * quiesced the stack. We can't process such frames then since
3691 * that might, for example, cause stations to be added or other
3692 * driver callbacks be invoked.
3694 if (unlikely(local->quiescing || local->suspended))
3697 /* We might be during a HW reconfig, prevent Rx for the same reason */
3698 if (unlikely(local->in_reconfig))
3702 * The same happens when we're not even started,
3703 * but that's worth a warning.
3705 if (WARN_ON(!local->started))
3708 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3710 * Validate the rate, unless a PLCP error means that
3711 * we probably can't have a valid rate here anyway.
3714 if (status->flag & RX_FLAG_HT) {
3716 * rate_idx is MCS index, which can be [0-76]
3719 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3721 * Anything else would be some sort of driver or
3722 * hardware error. The driver should catch hardware
3725 if (WARN(status->rate_idx > 76,
3726 "Rate marked as an HT rate but passed "
3727 "status->rate_idx is not "
3728 "an MCS index [0-76]: %d (0x%02x)\n",
3732 } else if (status->flag & RX_FLAG_VHT) {
3733 if (WARN_ONCE(status->rate_idx > 9 ||
3735 status->vht_nss > 8,
3736 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3737 status->rate_idx, status->vht_nss))
3740 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3742 rate = &sband->bitrates[status->rate_idx];
3746 status->rx_flags = 0;
3749 * key references and virtual interfaces are protected using RCU
3750 * and this requires that we are in a read-side RCU section during
3751 * receive processing
3756 * Frames with failed FCS/PLCP checksum are not returned,
3757 * all other frames are returned without radiotap header
3758 * if it was previously present.
3759 * Also, frames with less than 16 bytes are dropped.
3761 skb = ieee80211_rx_monitor(local, skb, rate);
3767 ieee80211_tpt_led_trig_rx(local,
3768 ((struct ieee80211_hdr *)skb->data)->frame_control,
3771 __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
3779 EXPORT_SYMBOL(ieee80211_rx_napi);
3781 /* This is a version of the rx handler that can be called from hard irq
3782 * context. Post the skb on the queue and schedule the tasklet */
3783 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3785 struct ieee80211_local *local = hw_to_local(hw);
3787 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3789 skb->pkt_type = IEEE80211_RX_MSG;
3790 skb_queue_tail(&local->skb_queue, skb);
3791 tasklet_schedule(&local->tasklet);
3793 EXPORT_SYMBOL(ieee80211_rx_irqsafe);