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
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/jiffies.h>
14 #include <linux/slab.h>
15 #include <linux/kernel.h>
16 #include <linux/skbuff.h>
17 #include <linux/netdevice.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rcupdate.h>
20 #include <linux/export.h>
21 #include <net/mac80211.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <asm/unaligned.h>
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
35 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
37 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
39 u64_stats_update_begin(&tstats->syncp);
41 tstats->rx_bytes += len;
42 u64_stats_update_end(&tstats->syncp);
45 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
46 enum nl80211_iftype type)
48 __le16 fc = hdr->frame_control;
50 if (ieee80211_is_data(fc)) {
51 if (len < 24) /* drop incorrect hdr len (data) */
54 if (ieee80211_has_a4(fc))
56 if (ieee80211_has_tods(fc))
58 if (ieee80211_has_fromds(fc))
64 if (ieee80211_is_mgmt(fc)) {
65 if (len < 24) /* drop incorrect hdr len (mgmt) */
70 if (ieee80211_is_ctl(fc)) {
71 if (ieee80211_is_pspoll(fc))
74 if (ieee80211_is_back_req(fc)) {
76 case NL80211_IFTYPE_STATION:
78 case NL80211_IFTYPE_AP:
79 case NL80211_IFTYPE_AP_VLAN:
82 break; /* fall through to the return */
91 * monitor mode reception
93 * This function cleans up the SKB, i.e. it removes all the stuff
94 * only useful for monitoring.
96 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
98 unsigned int rtap_vendor_space)
100 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
101 if (likely(skb->len > FCS_LEN))
102 __pskb_trim(skb, skb->len - FCS_LEN);
111 __pskb_pull(skb, rtap_vendor_space);
116 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
117 unsigned int rtap_vendor_space)
119 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
120 struct ieee80211_hdr *hdr;
122 hdr = (void *)(skb->data + rtap_vendor_space);
124 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
125 RX_FLAG_FAILED_PLCP_CRC))
128 if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
131 if (ieee80211_is_ctl(hdr->frame_control) &&
132 !ieee80211_is_pspoll(hdr->frame_control) &&
133 !ieee80211_is_back_req(hdr->frame_control))
140 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
141 struct ieee80211_rx_status *status,
146 /* always present fields */
147 len = sizeof(struct ieee80211_radiotap_header) + 8;
149 /* allocate extra bitmaps */
151 len += 4 * hweight8(status->chains);
153 if (ieee80211_have_rx_timestamp(status)) {
157 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
160 /* antenna field, if we don't have per-chain info */
164 /* padding for RX_FLAGS if necessary */
167 if (status->flag & RX_FLAG_HT) /* HT info */
170 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
175 if (status->flag & RX_FLAG_VHT) {
180 if (status->chains) {
181 /* antenna and antenna signal fields */
182 len += 2 * hweight8(status->chains);
185 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
186 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
188 /* vendor presence bitmap */
190 /* alignment for fixed 6-byte vendor data header */
192 /* vendor data header */
194 if (WARN_ON(rtap->align == 0))
196 len = ALIGN(len, rtap->align);
197 len += rtap->len + rtap->pad;
204 * ieee80211_add_rx_radiotap_header - add radiotap header
206 * add a radiotap header containing all the fields which the hardware provided.
209 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
211 struct ieee80211_rate *rate,
212 int rtap_len, bool has_fcs)
214 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
215 struct ieee80211_radiotap_header *rthdr;
220 u16 channel_flags = 0;
222 unsigned long chains = status->chains;
223 struct ieee80211_vendor_radiotap rtap = {};
225 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
226 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
227 /* rtap.len and rtap.pad are undone immediately */
228 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
232 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
235 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
236 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
237 it_present = &rthdr->it_present;
239 /* radiotap header, set always present flags */
240 rthdr->it_len = cpu_to_le16(rtap_len);
241 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
242 BIT(IEEE80211_RADIOTAP_CHANNEL) |
243 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
246 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
248 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
250 BIT(IEEE80211_RADIOTAP_EXT) |
251 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
252 put_unaligned_le32(it_present_val, it_present);
254 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
255 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
258 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
259 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
260 BIT(IEEE80211_RADIOTAP_EXT);
261 put_unaligned_le32(it_present_val, it_present);
263 it_present_val = rtap.present;
266 put_unaligned_le32(it_present_val, it_present);
268 pos = (void *)(it_present + 1);
270 /* the order of the following fields is important */
272 /* IEEE80211_RADIOTAP_TSFT */
273 if (ieee80211_have_rx_timestamp(status)) {
275 while ((pos - (u8 *)rthdr) & 7)
278 ieee80211_calculate_rx_timestamp(local, status,
281 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
285 /* IEEE80211_RADIOTAP_FLAGS */
286 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
287 *pos |= IEEE80211_RADIOTAP_F_FCS;
288 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
289 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
290 if (status->flag & RX_FLAG_SHORTPRE)
291 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
294 /* IEEE80211_RADIOTAP_RATE */
295 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
297 * Without rate information don't add it. If we have,
298 * MCS information is a separate field in radiotap,
299 * added below. The byte here is needed as padding
300 * for the channel though, so initialise it to 0.
305 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
306 if (status->flag & RX_FLAG_10MHZ)
308 else if (status->flag & RX_FLAG_5MHZ)
310 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
314 /* IEEE80211_RADIOTAP_CHANNEL */
315 put_unaligned_le16(status->freq, pos);
317 if (status->flag & RX_FLAG_10MHZ)
318 channel_flags |= IEEE80211_CHAN_HALF;
319 else if (status->flag & RX_FLAG_5MHZ)
320 channel_flags |= IEEE80211_CHAN_QUARTER;
322 if (status->band == IEEE80211_BAND_5GHZ)
323 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
324 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
325 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
326 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
327 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
329 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
331 channel_flags |= IEEE80211_CHAN_2GHZ;
332 put_unaligned_le16(channel_flags, pos);
335 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
336 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
337 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
338 *pos = status->signal;
340 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
344 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
346 if (!status->chains) {
347 /* IEEE80211_RADIOTAP_ANTENNA */
348 *pos = status->antenna;
352 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
354 /* IEEE80211_RADIOTAP_RX_FLAGS */
355 /* ensure 2 byte alignment for the 2 byte field as required */
356 if ((pos - (u8 *)rthdr) & 1)
358 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
359 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
360 put_unaligned_le16(rx_flags, pos);
363 if (status->flag & RX_FLAG_HT) {
366 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
367 *pos++ = local->hw.radiotap_mcs_details;
369 if (status->flag & RX_FLAG_SHORT_GI)
370 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
371 if (status->flag & RX_FLAG_40MHZ)
372 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
373 if (status->flag & RX_FLAG_HT_GF)
374 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
375 if (status->flag & RX_FLAG_LDPC)
376 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
377 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
378 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
380 *pos++ = status->rate_idx;
383 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
386 /* ensure 4 byte alignment */
387 while ((pos - (u8 *)rthdr) & 3)
390 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
391 put_unaligned_le32(status->ampdu_reference, pos);
393 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
394 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
395 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
396 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
397 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
398 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
399 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
400 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
401 put_unaligned_le16(flags, pos);
403 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
404 *pos++ = status->ampdu_delimiter_crc;
410 if (status->flag & RX_FLAG_VHT) {
411 u16 known = local->hw.radiotap_vht_details;
413 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
414 put_unaligned_le16(known, pos);
417 if (status->flag & RX_FLAG_SHORT_GI)
418 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
419 /* in VHT, STBC is binary */
420 if (status->flag & RX_FLAG_STBC_MASK)
421 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
422 if (status->vht_flag & RX_VHT_FLAG_BF)
423 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
426 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
428 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
430 else if (status->flag & RX_FLAG_40MHZ)
435 *pos = (status->rate_idx << 4) | status->vht_nss;
438 if (status->flag & RX_FLAG_LDPC)
439 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
447 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
448 *pos++ = status->chain_signal[chain];
452 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
453 /* ensure 2 byte alignment for the vendor field as required */
454 if ((pos - (u8 *)rthdr) & 1)
456 *pos++ = rtap.oui[0];
457 *pos++ = rtap.oui[1];
458 *pos++ = rtap.oui[2];
460 put_unaligned_le16(rtap.len, pos);
462 /* align the actual payload as requested */
463 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
465 /* data (and possible padding) already follows */
470 * This function copies a received frame to all monitor interfaces and
471 * returns a cleaned-up SKB that no longer includes the FCS nor the
472 * radiotap header the driver might have added.
474 static struct sk_buff *
475 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
476 struct ieee80211_rate *rate)
478 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
479 struct ieee80211_sub_if_data *sdata;
480 int rt_hdrlen, needed_headroom;
481 struct sk_buff *skb, *skb2;
482 struct net_device *prev_dev = NULL;
483 int present_fcs_len = 0;
484 unsigned int rtap_vendor_space = 0;
486 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
487 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
489 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
493 * First, we may need to make a copy of the skb because
494 * (1) we need to modify it for radiotap (if not present), and
495 * (2) the other RX handlers will modify the skb we got.
497 * We don't need to, of course, if we aren't going to return
498 * the SKB because it has a bad FCS/PLCP checksum.
501 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
502 present_fcs_len = FCS_LEN;
504 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
505 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
506 dev_kfree_skb(origskb);
510 if (!local->monitors) {
511 if (should_drop_frame(origskb, present_fcs_len,
512 rtap_vendor_space)) {
513 dev_kfree_skb(origskb);
517 return remove_monitor_info(local, origskb, rtap_vendor_space);
520 /* room for the radiotap header based on driver features */
521 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
522 needed_headroom = rt_hdrlen - rtap_vendor_space;
524 if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
525 /* only need to expand headroom if necessary */
530 * This shouldn't trigger often because most devices have an
531 * RX header they pull before we get here, and that should
532 * be big enough for our radiotap information. We should
533 * probably export the length to drivers so that we can have
534 * them allocate enough headroom to start with.
536 if (skb_headroom(skb) < needed_headroom &&
537 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
543 * Need to make a copy and possibly remove radiotap header
544 * and FCS from the original.
546 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
548 origskb = remove_monitor_info(local, origskb,
555 /* prepend radiotap information */
556 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
558 skb_reset_mac_header(skb);
559 skb->ip_summed = CHECKSUM_UNNECESSARY;
560 skb->pkt_type = PACKET_OTHERHOST;
561 skb->protocol = htons(ETH_P_802_2);
563 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
564 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
567 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
570 if (!ieee80211_sdata_running(sdata))
574 skb2 = skb_clone(skb, GFP_ATOMIC);
576 skb2->dev = prev_dev;
577 netif_receive_skb(skb2);
581 prev_dev = sdata->dev;
582 ieee80211_rx_stats(sdata->dev, skb->len);
587 netif_receive_skb(skb);
594 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
597 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
598 int tid, seqno_idx, security_idx;
600 /* does the frame have a qos control field? */
601 if (ieee80211_is_data_qos(hdr->frame_control)) {
602 u8 *qc = ieee80211_get_qos_ctl(hdr);
603 /* frame has qos control */
604 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
605 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
606 status->rx_flags |= IEEE80211_RX_AMSDU;
612 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
614 * Sequence numbers for management frames, QoS data
615 * frames with a broadcast/multicast address in the
616 * Address 1 field, and all non-QoS data frames sent
617 * by QoS STAs are assigned using an additional single
618 * modulo-4096 counter, [...]
620 * We also use that counter for non-QoS STAs.
622 seqno_idx = IEEE80211_NUM_TIDS;
624 if (ieee80211_is_mgmt(hdr->frame_control))
625 security_idx = IEEE80211_NUM_TIDS;
629 rx->seqno_idx = seqno_idx;
630 rx->security_idx = security_idx;
631 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
632 * For now, set skb->priority to 0 for other cases. */
633 rx->skb->priority = (tid > 7) ? 0 : tid;
637 * DOC: Packet alignment
639 * Drivers always need to pass packets that are aligned to two-byte boundaries
642 * Additionally, should, if possible, align the payload data in a way that
643 * guarantees that the contained IP header is aligned to a four-byte
644 * boundary. In the case of regular frames, this simply means aligning the
645 * payload to a four-byte boundary (because either the IP header is directly
646 * contained, or IV/RFC1042 headers that have a length divisible by four are
647 * in front of it). If the payload data is not properly aligned and the
648 * architecture doesn't support efficient unaligned operations, mac80211
649 * will align the data.
651 * With A-MSDU frames, however, the payload data address must yield two modulo
652 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
653 * push the IP header further back to a multiple of four again. Thankfully, the
654 * specs were sane enough this time around to require padding each A-MSDU
655 * subframe to a length that is a multiple of four.
657 * Padding like Atheros hardware adds which is between the 802.11 header and
658 * the payload is not supported, the driver is required to move the 802.11
659 * header to be directly in front of the payload in that case.
661 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
663 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
664 WARN_ONCE((unsigned long)rx->skb->data & 1,
665 "unaligned packet at 0x%p\n", rx->skb->data);
672 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
674 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
676 if (is_multicast_ether_addr(hdr->addr1))
679 return ieee80211_is_robust_mgmt_frame(skb);
683 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
685 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
687 if (!is_multicast_ether_addr(hdr->addr1))
690 return ieee80211_is_robust_mgmt_frame(skb);
694 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
695 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
697 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
698 struct ieee80211_mmie *mmie;
699 struct ieee80211_mmie_16 *mmie16;
701 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
704 if (!ieee80211_is_robust_mgmt_frame(skb))
705 return -1; /* not a robust management frame */
707 mmie = (struct ieee80211_mmie *)
708 (skb->data + skb->len - sizeof(*mmie));
709 if (mmie->element_id == WLAN_EID_MMIE &&
710 mmie->length == sizeof(*mmie) - 2)
711 return le16_to_cpu(mmie->key_id);
713 mmie16 = (struct ieee80211_mmie_16 *)
714 (skb->data + skb->len - sizeof(*mmie16));
715 if (skb->len >= 24 + sizeof(*mmie16) &&
716 mmie16->element_id == WLAN_EID_MMIE &&
717 mmie16->length == sizeof(*mmie16) - 2)
718 return le16_to_cpu(mmie16->key_id);
723 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
726 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
731 fc = hdr->frame_control;
732 hdrlen = ieee80211_hdrlen(fc);
734 if (skb->len < hdrlen + cs->hdr_len)
737 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
738 keyid &= cs->key_idx_mask;
739 keyid >>= cs->key_idx_shift;
744 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
746 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
747 char *dev_addr = rx->sdata->vif.addr;
749 if (ieee80211_is_data(hdr->frame_control)) {
750 if (is_multicast_ether_addr(hdr->addr1)) {
751 if (ieee80211_has_tods(hdr->frame_control) ||
752 !ieee80211_has_fromds(hdr->frame_control))
753 return RX_DROP_MONITOR;
754 if (ether_addr_equal(hdr->addr3, dev_addr))
755 return RX_DROP_MONITOR;
757 if (!ieee80211_has_a4(hdr->frame_control))
758 return RX_DROP_MONITOR;
759 if (ether_addr_equal(hdr->addr4, dev_addr))
760 return RX_DROP_MONITOR;
764 /* If there is not an established peer link and this is not a peer link
765 * establisment frame, beacon or probe, drop the frame.
768 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
769 struct ieee80211_mgmt *mgmt;
771 if (!ieee80211_is_mgmt(hdr->frame_control))
772 return RX_DROP_MONITOR;
774 if (ieee80211_is_action(hdr->frame_control)) {
777 /* make sure category field is present */
778 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
779 return RX_DROP_MONITOR;
781 mgmt = (struct ieee80211_mgmt *)hdr;
782 category = mgmt->u.action.category;
783 if (category != WLAN_CATEGORY_MESH_ACTION &&
784 category != WLAN_CATEGORY_SELF_PROTECTED)
785 return RX_DROP_MONITOR;
789 if (ieee80211_is_probe_req(hdr->frame_control) ||
790 ieee80211_is_probe_resp(hdr->frame_control) ||
791 ieee80211_is_beacon(hdr->frame_control) ||
792 ieee80211_is_auth(hdr->frame_control))
795 return RX_DROP_MONITOR;
801 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
802 struct tid_ampdu_rx *tid_agg_rx,
804 struct sk_buff_head *frames)
806 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
808 struct ieee80211_rx_status *status;
810 lockdep_assert_held(&tid_agg_rx->reorder_lock);
812 if (skb_queue_empty(skb_list))
815 if (!ieee80211_rx_reorder_ready(skb_list)) {
816 __skb_queue_purge(skb_list);
820 /* release frames from the reorder ring buffer */
821 tid_agg_rx->stored_mpdu_num--;
822 while ((skb = __skb_dequeue(skb_list))) {
823 status = IEEE80211_SKB_RXCB(skb);
824 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
825 __skb_queue_tail(frames, skb);
829 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
832 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
833 struct tid_ampdu_rx *tid_agg_rx,
835 struct sk_buff_head *frames)
839 lockdep_assert_held(&tid_agg_rx->reorder_lock);
841 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
842 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
843 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
849 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
850 * the skb was added to the buffer longer than this time ago, the earlier
851 * frames that have not yet been received are assumed to be lost and the skb
852 * can be released for processing. This may also release other skb's from the
853 * reorder buffer if there are no additional gaps between the frames.
855 * Callers must hold tid_agg_rx->reorder_lock.
857 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
859 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
860 struct tid_ampdu_rx *tid_agg_rx,
861 struct sk_buff_head *frames)
865 lockdep_assert_held(&tid_agg_rx->reorder_lock);
867 /* release the buffer until next missing frame */
868 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
869 if (!ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index]) &&
870 tid_agg_rx->stored_mpdu_num) {
872 * No buffers ready to be released, but check whether any
873 * frames in the reorder buffer have timed out.
876 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
877 j = (j + 1) % tid_agg_rx->buf_size) {
878 if (!ieee80211_rx_reorder_ready(
879 &tid_agg_rx->reorder_buf[j])) {
884 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
885 HT_RX_REORDER_BUF_TIMEOUT))
886 goto set_release_timer;
888 /* don't leave incomplete A-MSDUs around */
889 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
890 i = (i + 1) % tid_agg_rx->buf_size)
891 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
893 ht_dbg_ratelimited(sdata,
894 "release an RX reorder frame due to timeout on earlier frames\n");
895 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
899 * Increment the head seq# also for the skipped slots.
901 tid_agg_rx->head_seq_num =
902 (tid_agg_rx->head_seq_num +
903 skipped) & IEEE80211_SN_MASK;
906 } else while (ieee80211_rx_reorder_ready(
907 &tid_agg_rx->reorder_buf[index])) {
908 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
910 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
913 if (tid_agg_rx->stored_mpdu_num) {
914 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
916 for (; j != (index - 1) % tid_agg_rx->buf_size;
917 j = (j + 1) % tid_agg_rx->buf_size) {
918 if (ieee80211_rx_reorder_ready(
919 &tid_agg_rx->reorder_buf[j]))
925 if (!tid_agg_rx->removed)
926 mod_timer(&tid_agg_rx->reorder_timer,
927 tid_agg_rx->reorder_time[j] + 1 +
928 HT_RX_REORDER_BUF_TIMEOUT);
930 del_timer(&tid_agg_rx->reorder_timer);
935 * As this function belongs to the RX path it must be under
936 * rcu_read_lock protection. It returns false if the frame
937 * can be processed immediately, true if it was consumed.
939 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
940 struct tid_ampdu_rx *tid_agg_rx,
942 struct sk_buff_head *frames)
944 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
945 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
946 u16 sc = le16_to_cpu(hdr->seq_ctrl);
947 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
948 u16 head_seq_num, buf_size;
952 spin_lock(&tid_agg_rx->reorder_lock);
955 * Offloaded BA sessions have no known starting sequence number so pick
956 * one from first Rxed frame for this tid after BA was started.
958 if (unlikely(tid_agg_rx->auto_seq)) {
959 tid_agg_rx->auto_seq = false;
960 tid_agg_rx->ssn = mpdu_seq_num;
961 tid_agg_rx->head_seq_num = mpdu_seq_num;
964 buf_size = tid_agg_rx->buf_size;
965 head_seq_num = tid_agg_rx->head_seq_num;
967 /* frame with out of date sequence number */
968 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
974 * If frame the sequence number exceeds our buffering window
975 * size release some previous frames to make room for this one.
977 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
978 head_seq_num = ieee80211_sn_inc(
979 ieee80211_sn_sub(mpdu_seq_num, buf_size));
980 /* release stored frames up to new head to stack */
981 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
982 head_seq_num, frames);
985 /* Now the new frame is always in the range of the reordering buffer */
987 index = mpdu_seq_num % tid_agg_rx->buf_size;
989 /* check if we already stored this frame */
990 if (ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index])) {
996 * If the current MPDU is in the right order and nothing else
997 * is stored we can process it directly, no need to buffer it.
998 * If it is first but there's something stored, we may be able
999 * to release frames after this one.
1001 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1002 tid_agg_rx->stored_mpdu_num == 0) {
1003 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1004 tid_agg_rx->head_seq_num =
1005 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1010 /* put the frame in the reordering buffer */
1011 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1012 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1013 tid_agg_rx->reorder_time[index] = jiffies;
1014 tid_agg_rx->stored_mpdu_num++;
1015 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1019 spin_unlock(&tid_agg_rx->reorder_lock);
1024 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1025 * true if the MPDU was buffered, false if it should be processed.
1027 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1028 struct sk_buff_head *frames)
1030 struct sk_buff *skb = rx->skb;
1031 struct ieee80211_local *local = rx->local;
1032 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1033 struct sta_info *sta = rx->sta;
1034 struct tid_ampdu_rx *tid_agg_rx;
1038 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1039 is_multicast_ether_addr(hdr->addr1))
1043 * filter the QoS data rx stream according to
1044 * STA/TID and check if this STA/TID is on aggregation
1050 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1051 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1052 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1054 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1058 /* qos null data frames are excluded */
1059 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1062 /* not part of a BA session */
1063 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1064 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1067 /* new, potentially un-ordered, ampdu frame - process it */
1069 /* reset session timer */
1070 if (tid_agg_rx->timeout)
1071 tid_agg_rx->last_rx = jiffies;
1073 /* if this mpdu is fragmented - terminate rx aggregation session */
1074 sc = le16_to_cpu(hdr->seq_ctrl);
1075 if (sc & IEEE80211_SCTL_FRAG) {
1076 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1077 skb_queue_tail(&rx->sdata->skb_queue, skb);
1078 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1083 * No locking needed -- we will only ever process one
1084 * RX packet at a time, and thus own tid_agg_rx. All
1085 * other code manipulating it needs to (and does) make
1086 * sure that we cannot get to it any more before doing
1089 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1094 __skb_queue_tail(frames, skb);
1097 static ieee80211_rx_result debug_noinline
1098 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1100 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1101 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1104 * Drop duplicate 802.11 retransmissions
1105 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1108 if (rx->skb->len < 24)
1111 if (ieee80211_is_ctl(hdr->frame_control) ||
1112 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1113 is_multicast_ether_addr(hdr->addr1))
1119 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1120 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1121 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1122 rx->sta->rx_stats.num_duplicates++;
1123 return RX_DROP_UNUSABLE;
1124 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1125 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1131 static ieee80211_rx_result debug_noinline
1132 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1134 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1136 /* Drop disallowed frame classes based on STA auth/assoc state;
1137 * IEEE 802.11, Chap 5.5.
1139 * mac80211 filters only based on association state, i.e. it drops
1140 * Class 3 frames from not associated stations. hostapd sends
1141 * deauth/disassoc frames when needed. In addition, hostapd is
1142 * responsible for filtering on both auth and assoc states.
1145 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1146 return ieee80211_rx_mesh_check(rx);
1148 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1149 ieee80211_is_pspoll(hdr->frame_control)) &&
1150 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1151 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1152 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1153 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1155 * accept port control frames from the AP even when it's not
1156 * yet marked ASSOC to prevent a race where we don't set the
1157 * assoc bit quickly enough before it sends the first frame
1159 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1160 ieee80211_is_data_present(hdr->frame_control)) {
1161 unsigned int hdrlen;
1164 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1166 if (rx->skb->len < hdrlen + 8)
1167 return RX_DROP_MONITOR;
1169 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
1170 if (ethertype == rx->sdata->control_port_protocol)
1174 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1175 cfg80211_rx_spurious_frame(rx->sdata->dev,
1178 return RX_DROP_UNUSABLE;
1180 return RX_DROP_MONITOR;
1187 static ieee80211_rx_result debug_noinline
1188 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1190 struct ieee80211_local *local;
1191 struct ieee80211_hdr *hdr;
1192 struct sk_buff *skb;
1196 hdr = (struct ieee80211_hdr *) skb->data;
1198 if (!local->pspolling)
1201 if (!ieee80211_has_fromds(hdr->frame_control))
1202 /* this is not from AP */
1205 if (!ieee80211_is_data(hdr->frame_control))
1208 if (!ieee80211_has_moredata(hdr->frame_control)) {
1209 /* AP has no more frames buffered for us */
1210 local->pspolling = false;
1214 /* more data bit is set, let's request a new frame from the AP */
1215 ieee80211_send_pspoll(local, rx->sdata);
1220 static void sta_ps_start(struct sta_info *sta)
1222 struct ieee80211_sub_if_data *sdata = sta->sdata;
1223 struct ieee80211_local *local = sdata->local;
1227 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1228 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1229 ps = &sdata->bss->ps;
1233 atomic_inc(&ps->num_sta_ps);
1234 set_sta_flag(sta, WLAN_STA_PS_STA);
1235 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1236 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1237 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1238 sta->sta.addr, sta->sta.aid);
1240 ieee80211_clear_fast_xmit(sta);
1242 if (!sta->sta.txq[0])
1245 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1246 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1248 if (!skb_queue_len(&txqi->queue))
1249 set_bit(tid, &sta->txq_buffered_tids);
1251 clear_bit(tid, &sta->txq_buffered_tids);
1255 static void sta_ps_end(struct sta_info *sta)
1257 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1258 sta->sta.addr, sta->sta.aid);
1260 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1262 * Clear the flag only if the other one is still set
1263 * so that the TX path won't start TX'ing new frames
1264 * directly ... In the case that the driver flag isn't
1265 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1267 clear_sta_flag(sta, WLAN_STA_PS_STA);
1268 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1269 sta->sta.addr, sta->sta.aid);
1273 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1274 clear_sta_flag(sta, WLAN_STA_PS_STA);
1275 ieee80211_sta_ps_deliver_wakeup(sta);
1278 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1280 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1283 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1285 /* Don't let the same PS state be set twice */
1286 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1287 if ((start && in_ps) || (!start && !in_ps))
1297 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1299 static ieee80211_rx_result debug_noinline
1300 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1302 struct ieee80211_sub_if_data *sdata = rx->sdata;
1303 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1304 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1310 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1311 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1315 * The device handles station powersave, so don't do anything about
1316 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1317 * it to mac80211 since they're handled.)
1319 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1323 * Don't do anything if the station isn't already asleep. In
1324 * the uAPSD case, the station will probably be marked asleep,
1325 * in the PS-Poll case the station must be confused ...
1327 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1330 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1331 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1332 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1333 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1335 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1338 /* Free PS Poll skb here instead of returning RX_DROP that would
1339 * count as an dropped frame. */
1340 dev_kfree_skb(rx->skb);
1343 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1344 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1345 ieee80211_has_pm(hdr->frame_control) &&
1346 (ieee80211_is_data_qos(hdr->frame_control) ||
1347 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1348 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1349 ac = ieee802_1d_to_ac[tid & 7];
1352 * If this AC is not trigger-enabled do nothing.
1354 * NB: This could/should check a separate bitmap of trigger-
1355 * enabled queues, but for now we only implement uAPSD w/o
1356 * TSPEC changes to the ACs, so they're always the same.
1358 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1361 /* if we are in a service period, do nothing */
1362 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1365 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1366 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1368 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1374 static ieee80211_rx_result debug_noinline
1375 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1377 struct sta_info *sta = rx->sta;
1378 struct sk_buff *skb = rx->skb;
1379 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1380 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1387 * Update last_rx only for IBSS packets which are for the current
1388 * BSSID and for station already AUTHORIZED to avoid keeping the
1389 * current IBSS network alive in cases where other STAs start
1390 * using different BSSID. This will also give the station another
1391 * chance to restart the authentication/authorization in case
1392 * something went wrong the first time.
1394 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1395 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1396 NL80211_IFTYPE_ADHOC);
1397 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1398 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1399 sta->rx_stats.last_rx = jiffies;
1400 if (ieee80211_is_data(hdr->frame_control) &&
1401 !is_multicast_ether_addr(hdr->addr1)) {
1402 sta->rx_stats.last_rate_idx =
1404 sta->rx_stats.last_rate_flag =
1406 sta->rx_stats.last_rate_vht_flag =
1408 sta->rx_stats.last_rate_vht_nss =
1412 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1413 sta->rx_stats.last_rx = jiffies;
1414 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1416 * Mesh beacons will update last_rx when if they are found to
1417 * match the current local configuration when processed.
1419 sta->rx_stats.last_rx = jiffies;
1420 if (ieee80211_is_data(hdr->frame_control)) {
1421 sta->rx_stats.last_rate_idx = status->rate_idx;
1422 sta->rx_stats.last_rate_flag = status->flag;
1423 sta->rx_stats.last_rate_vht_flag = status->vht_flag;
1424 sta->rx_stats.last_rate_vht_nss = status->vht_nss;
1428 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1429 ieee80211_sta_rx_notify(rx->sdata, hdr);
1431 sta->rx_stats.fragments++;
1432 sta->rx_stats.bytes += rx->skb->len;
1433 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1434 sta->rx_stats.last_signal = status->signal;
1435 ewma_signal_add(&sta->rx_stats.avg_signal, -status->signal);
1438 if (status->chains) {
1439 sta->rx_stats.chains = status->chains;
1440 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1441 int signal = status->chain_signal[i];
1443 if (!(status->chains & BIT(i)))
1446 sta->rx_stats.chain_signal_last[i] = signal;
1447 ewma_signal_add(&sta->rx_stats.chain_signal_avg[i],
1453 * Change STA power saving mode only at the end of a frame
1454 * exchange sequence.
1456 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1457 !ieee80211_has_morefrags(hdr->frame_control) &&
1458 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1459 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1460 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1461 /* PM bit is only checked in frames where it isn't reserved,
1462 * in AP mode it's reserved in non-bufferable management frames
1463 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1465 (!ieee80211_is_mgmt(hdr->frame_control) ||
1466 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1467 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1468 if (!ieee80211_has_pm(hdr->frame_control))
1471 if (ieee80211_has_pm(hdr->frame_control))
1476 /* mesh power save support */
1477 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1478 ieee80211_mps_rx_h_sta_process(sta, hdr);
1481 * Drop (qos-)data::nullfunc frames silently, since they
1482 * are used only to control station power saving mode.
1484 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1485 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1486 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1489 * If we receive a 4-addr nullfunc frame from a STA
1490 * that was not moved to a 4-addr STA vlan yet send
1491 * the event to userspace and for older hostapd drop
1492 * the frame to the monitor interface.
1494 if (ieee80211_has_a4(hdr->frame_control) &&
1495 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1496 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1497 !rx->sdata->u.vlan.sta))) {
1498 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1499 cfg80211_rx_unexpected_4addr_frame(
1500 rx->sdata->dev, sta->sta.addr,
1502 return RX_DROP_MONITOR;
1505 * Update counter and free packet here to avoid
1506 * counting this as a dropped packed.
1508 sta->rx_stats.packets++;
1509 dev_kfree_skb(rx->skb);
1514 } /* ieee80211_rx_h_sta_process */
1516 static ieee80211_rx_result debug_noinline
1517 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1519 struct sk_buff *skb = rx->skb;
1520 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1521 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1524 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1525 struct ieee80211_key *sta_ptk = NULL;
1526 int mmie_keyidx = -1;
1528 const struct ieee80211_cipher_scheme *cs = NULL;
1533 * There are four types of keys:
1534 * - GTK (group keys)
1535 * - IGTK (group keys for management frames)
1536 * - PTK (pairwise keys)
1537 * - STK (station-to-station pairwise keys)
1539 * When selecting a key, we have to distinguish between multicast
1540 * (including broadcast) and unicast frames, the latter can only
1541 * use PTKs and STKs while the former always use GTKs and IGTKs.
1542 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1543 * unicast frames can also use key indices like GTKs. Hence, if we
1544 * don't have a PTK/STK we check the key index for a WEP key.
1546 * Note that in a regular BSS, multicast frames are sent by the
1547 * AP only, associated stations unicast the frame to the AP first
1548 * which then multicasts it on their behalf.
1550 * There is also a slight problem in IBSS mode: GTKs are negotiated
1551 * with each station, that is something we don't currently handle.
1552 * The spec seems to expect that one negotiates the same key with
1553 * every station but there's no such requirement; VLANs could be
1557 /* start without a key */
1559 fc = hdr->frame_control;
1562 int keyid = rx->sta->ptk_idx;
1564 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1565 cs = rx->sta->cipher_scheme;
1566 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1567 if (unlikely(keyid < 0))
1568 return RX_DROP_UNUSABLE;
1570 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1573 if (!ieee80211_has_protected(fc))
1574 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1576 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1578 if ((status->flag & RX_FLAG_DECRYPTED) &&
1579 (status->flag & RX_FLAG_IV_STRIPPED))
1581 /* Skip decryption if the frame is not protected. */
1582 if (!ieee80211_has_protected(fc))
1584 } else if (mmie_keyidx >= 0) {
1585 /* Broadcast/multicast robust management frame / BIP */
1586 if ((status->flag & RX_FLAG_DECRYPTED) &&
1587 (status->flag & RX_FLAG_IV_STRIPPED))
1590 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1591 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1592 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1594 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1596 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1597 } else if (!ieee80211_has_protected(fc)) {
1599 * The frame was not protected, so skip decryption. However, we
1600 * need to set rx->key if there is a key that could have been
1601 * used so that the frame may be dropped if encryption would
1602 * have been expected.
1604 struct ieee80211_key *key = NULL;
1605 struct ieee80211_sub_if_data *sdata = rx->sdata;
1608 if (ieee80211_is_mgmt(fc) &&
1609 is_multicast_ether_addr(hdr->addr1) &&
1610 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1614 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1615 key = rcu_dereference(rx->sta->gtk[i]);
1621 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1622 key = rcu_dereference(sdata->keys[i]);
1635 * The device doesn't give us the IV so we won't be
1636 * able to look up the key. That's ok though, we
1637 * don't need to decrypt the frame, we just won't
1638 * be able to keep statistics accurate.
1639 * Except for key threshold notifications, should
1640 * we somehow allow the driver to tell us which key
1641 * the hardware used if this flag is set?
1643 if ((status->flag & RX_FLAG_DECRYPTED) &&
1644 (status->flag & RX_FLAG_IV_STRIPPED))
1647 hdrlen = ieee80211_hdrlen(fc);
1650 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1652 if (unlikely(keyidx < 0))
1653 return RX_DROP_UNUSABLE;
1655 if (rx->skb->len < 8 + hdrlen)
1656 return RX_DROP_UNUSABLE; /* TODO: count this? */
1658 * no need to call ieee80211_wep_get_keyidx,
1659 * it verifies a bunch of things we've done already
1661 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1662 keyidx = keyid >> 6;
1665 /* check per-station GTK first, if multicast packet */
1666 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1667 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1669 /* if not found, try default key */
1671 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1674 * RSNA-protected unicast frames should always be
1675 * sent with pairwise or station-to-station keys,
1676 * but for WEP we allow using a key index as well.
1679 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1680 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1681 !is_multicast_ether_addr(hdr->addr1))
1687 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1688 return RX_DROP_MONITOR;
1690 /* TODO: add threshold stuff again */
1692 return RX_DROP_MONITOR;
1695 switch (rx->key->conf.cipher) {
1696 case WLAN_CIPHER_SUITE_WEP40:
1697 case WLAN_CIPHER_SUITE_WEP104:
1698 result = ieee80211_crypto_wep_decrypt(rx);
1700 case WLAN_CIPHER_SUITE_TKIP:
1701 result = ieee80211_crypto_tkip_decrypt(rx);
1703 case WLAN_CIPHER_SUITE_CCMP:
1704 result = ieee80211_crypto_ccmp_decrypt(
1705 rx, IEEE80211_CCMP_MIC_LEN);
1707 case WLAN_CIPHER_SUITE_CCMP_256:
1708 result = ieee80211_crypto_ccmp_decrypt(
1709 rx, IEEE80211_CCMP_256_MIC_LEN);
1711 case WLAN_CIPHER_SUITE_AES_CMAC:
1712 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1714 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1715 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1717 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1718 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1719 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1721 case WLAN_CIPHER_SUITE_GCMP:
1722 case WLAN_CIPHER_SUITE_GCMP_256:
1723 result = ieee80211_crypto_gcmp_decrypt(rx);
1726 result = ieee80211_crypto_hw_decrypt(rx);
1729 /* the hdr variable is invalid after the decrypt handlers */
1731 /* either the frame has been decrypted or will be dropped */
1732 status->flag |= RX_FLAG_DECRYPTED;
1737 static inline struct ieee80211_fragment_entry *
1738 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1739 unsigned int frag, unsigned int seq, int rx_queue,
1740 struct sk_buff **skb)
1742 struct ieee80211_fragment_entry *entry;
1744 entry = &sdata->fragments[sdata->fragment_next++];
1745 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1746 sdata->fragment_next = 0;
1748 if (!skb_queue_empty(&entry->skb_list))
1749 __skb_queue_purge(&entry->skb_list);
1751 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1753 entry->first_frag_time = jiffies;
1755 entry->rx_queue = rx_queue;
1756 entry->last_frag = frag;
1757 entry->check_sequential_pn = false;
1758 entry->extra_len = 0;
1763 static inline struct ieee80211_fragment_entry *
1764 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1765 unsigned int frag, unsigned int seq,
1766 int rx_queue, struct ieee80211_hdr *hdr)
1768 struct ieee80211_fragment_entry *entry;
1771 idx = sdata->fragment_next;
1772 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1773 struct ieee80211_hdr *f_hdr;
1777 idx = IEEE80211_FRAGMENT_MAX - 1;
1779 entry = &sdata->fragments[idx];
1780 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1781 entry->rx_queue != rx_queue ||
1782 entry->last_frag + 1 != frag)
1785 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1788 * Check ftype and addresses are equal, else check next fragment
1790 if (((hdr->frame_control ^ f_hdr->frame_control) &
1791 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1792 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1793 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1796 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1797 __skb_queue_purge(&entry->skb_list);
1806 static ieee80211_rx_result debug_noinline
1807 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1809 struct ieee80211_hdr *hdr;
1812 unsigned int frag, seq;
1813 struct ieee80211_fragment_entry *entry;
1814 struct sk_buff *skb;
1815 struct ieee80211_rx_status *status;
1817 hdr = (struct ieee80211_hdr *)rx->skb->data;
1818 fc = hdr->frame_control;
1820 if (ieee80211_is_ctl(fc))
1823 sc = le16_to_cpu(hdr->seq_ctrl);
1824 frag = sc & IEEE80211_SCTL_FRAG;
1826 if (is_multicast_ether_addr(hdr->addr1)) {
1827 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1831 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1834 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1836 if (skb_linearize(rx->skb))
1837 return RX_DROP_UNUSABLE;
1840 * skb_linearize() might change the skb->data and
1841 * previously cached variables (in this case, hdr) need to
1842 * be refreshed with the new data.
1844 hdr = (struct ieee80211_hdr *)rx->skb->data;
1845 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1848 /* This is the first fragment of a new frame. */
1849 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1850 rx->seqno_idx, &(rx->skb));
1852 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1853 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1854 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1855 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
1856 ieee80211_has_protected(fc)) {
1857 int queue = rx->security_idx;
1859 /* Store CCMP/GCMP PN so that we can verify that the
1860 * next fragment has a sequential PN value.
1862 entry->check_sequential_pn = true;
1863 memcpy(entry->last_pn,
1864 rx->key->u.ccmp.rx_pn[queue],
1865 IEEE80211_CCMP_PN_LEN);
1866 BUILD_BUG_ON(offsetof(struct ieee80211_key,
1868 offsetof(struct ieee80211_key,
1870 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
1871 sizeof(rx->key->u.gcmp.rx_pn[queue]));
1872 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
1873 IEEE80211_GCMP_PN_LEN);
1878 /* This is a fragment for a frame that should already be pending in
1879 * fragment cache. Add this fragment to the end of the pending entry.
1881 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1882 rx->seqno_idx, hdr);
1884 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1885 return RX_DROP_MONITOR;
1888 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
1889 * MPDU PN values are not incrementing in steps of 1."
1890 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
1891 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
1893 if (entry->check_sequential_pn) {
1895 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1899 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1900 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
1901 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
1902 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
1903 return RX_DROP_UNUSABLE;
1904 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1905 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1910 queue = rx->security_idx;
1911 rpn = rx->key->u.ccmp.rx_pn[queue];
1912 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1913 return RX_DROP_UNUSABLE;
1914 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1917 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1918 __skb_queue_tail(&entry->skb_list, rx->skb);
1919 entry->last_frag = frag;
1920 entry->extra_len += rx->skb->len;
1921 if (ieee80211_has_morefrags(fc)) {
1926 rx->skb = __skb_dequeue(&entry->skb_list);
1927 if (skb_tailroom(rx->skb) < entry->extra_len) {
1928 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
1929 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1931 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1932 __skb_queue_purge(&entry->skb_list);
1933 return RX_DROP_UNUSABLE;
1936 while ((skb = __skb_dequeue(&entry->skb_list))) {
1937 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1941 /* Complete frame has been reassembled - process it now */
1942 status = IEEE80211_SKB_RXCB(rx->skb);
1945 ieee80211_led_rx(rx->local);
1948 rx->sta->rx_stats.packets++;
1952 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1954 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1960 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1962 struct sk_buff *skb = rx->skb;
1963 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1966 * Pass through unencrypted frames if the hardware has
1967 * decrypted them already.
1969 if (status->flag & RX_FLAG_DECRYPTED)
1972 /* Drop unencrypted frames if key is set. */
1973 if (unlikely(!ieee80211_has_protected(fc) &&
1974 !ieee80211_is_nullfunc(fc) &&
1975 ieee80211_is_data(fc) && rx->key))
1981 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1983 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1984 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1985 __le16 fc = hdr->frame_control;
1988 * Pass through unencrypted frames if the hardware has
1989 * decrypted them already.
1991 if (status->flag & RX_FLAG_DECRYPTED)
1994 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1995 if (unlikely(!ieee80211_has_protected(fc) &&
1996 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1998 if (ieee80211_is_deauth(fc) ||
1999 ieee80211_is_disassoc(fc))
2000 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2005 /* BIP does not use Protected field, so need to check MMIE */
2006 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2007 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2008 if (ieee80211_is_deauth(fc) ||
2009 ieee80211_is_disassoc(fc))
2010 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2016 * When using MFP, Action frames are not allowed prior to
2017 * having configured keys.
2019 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2020 ieee80211_is_robust_mgmt_frame(rx->skb)))
2028 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2030 struct ieee80211_sub_if_data *sdata = rx->sdata;
2031 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2032 bool check_port_control = false;
2033 struct ethhdr *ehdr;
2036 *port_control = false;
2037 if (ieee80211_has_a4(hdr->frame_control) &&
2038 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2041 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2042 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2044 if (!sdata->u.mgd.use_4addr)
2047 check_port_control = true;
2050 if (is_multicast_ether_addr(hdr->addr1) &&
2051 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2054 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2058 ehdr = (struct ethhdr *) rx->skb->data;
2059 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2060 *port_control = true;
2061 else if (check_port_control)
2068 * requires that rx->skb is a frame with ethernet header
2070 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2072 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2073 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2074 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2077 * Allow EAPOL frames to us/the PAE group address regardless
2078 * of whether the frame was encrypted or not.
2080 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2081 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2082 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2085 if (ieee80211_802_1x_port_control(rx) ||
2086 ieee80211_drop_unencrypted(rx, fc))
2093 * requires that rx->skb is a frame with ethernet header
2096 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2098 struct ieee80211_sub_if_data *sdata = rx->sdata;
2099 struct net_device *dev = sdata->dev;
2100 struct sk_buff *skb, *xmit_skb;
2101 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2102 struct sta_info *dsta;
2107 ieee80211_rx_stats(dev, skb->len);
2109 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2110 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2111 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2112 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2113 if (is_multicast_ether_addr(ehdr->h_dest)) {
2115 * send multicast frames both to higher layers in
2116 * local net stack and back to the wireless medium
2118 xmit_skb = skb_copy(skb, GFP_ATOMIC);
2120 net_info_ratelimited("%s: failed to clone multicast frame\n",
2123 dsta = sta_info_get(sdata, skb->data);
2126 * The destination station is associated to
2127 * this AP (in this VLAN), so send the frame
2128 * directly to it and do not pass it to local
2137 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2139 /* 'align' will only take the values 0 or 2 here since all
2140 * frames are required to be aligned to 2-byte boundaries
2141 * when being passed to mac80211; the code here works just
2142 * as well if that isn't true, but mac80211 assumes it can
2143 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2147 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2149 if (WARN_ON(skb_headroom(skb) < 3)) {
2153 u8 *data = skb->data;
2154 size_t len = skb_headlen(skb);
2156 memmove(skb->data, data, len);
2157 skb_set_tail_pointer(skb, len);
2164 /* deliver to local stack */
2165 skb->protocol = eth_type_trans(skb, dev);
2166 memset(skb->cb, 0, sizeof(skb->cb));
2168 napi_gro_receive(rx->napi, skb);
2170 netif_receive_skb(skb);
2175 * Send to wireless media and increase priority by 256 to
2176 * keep the received priority instead of reclassifying
2177 * the frame (see cfg80211_classify8021d).
2179 xmit_skb->priority += 256;
2180 xmit_skb->protocol = htons(ETH_P_802_3);
2181 skb_reset_network_header(xmit_skb);
2182 skb_reset_mac_header(xmit_skb);
2183 dev_queue_xmit(xmit_skb);
2187 static ieee80211_rx_result debug_noinline
2188 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2190 struct net_device *dev = rx->sdata->dev;
2191 struct sk_buff *skb = rx->skb;
2192 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2193 __le16 fc = hdr->frame_control;
2194 struct sk_buff_head frame_list;
2195 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2197 if (unlikely(!ieee80211_is_data(fc)))
2200 if (unlikely(!ieee80211_is_data_present(fc)))
2201 return RX_DROP_MONITOR;
2203 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2206 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2207 switch (rx->sdata->vif.type) {
2208 case NL80211_IFTYPE_AP_VLAN:
2209 if (!rx->sdata->u.vlan.sta)
2210 return RX_DROP_UNUSABLE;
2212 case NL80211_IFTYPE_STATION:
2213 if (!rx->sdata->u.mgd.use_4addr)
2214 return RX_DROP_UNUSABLE;
2217 return RX_DROP_UNUSABLE;
2221 if (is_multicast_ether_addr(hdr->addr1))
2222 return RX_DROP_UNUSABLE;
2225 __skb_queue_head_init(&frame_list);
2227 if (skb_linearize(skb))
2228 return RX_DROP_UNUSABLE;
2230 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2231 rx->sdata->vif.type,
2232 rx->local->hw.extra_tx_headroom, true);
2234 while (!skb_queue_empty(&frame_list)) {
2235 rx->skb = __skb_dequeue(&frame_list);
2237 if (!ieee80211_frame_allowed(rx, fc)) {
2238 dev_kfree_skb(rx->skb);
2242 ieee80211_deliver_skb(rx);
2248 #ifdef CONFIG_MAC80211_MESH
2249 static ieee80211_rx_result
2250 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2252 struct ieee80211_hdr *fwd_hdr, *hdr;
2253 struct ieee80211_tx_info *info;
2254 struct ieee80211s_hdr *mesh_hdr;
2255 struct sk_buff *skb = rx->skb, *fwd_skb;
2256 struct ieee80211_local *local = rx->local;
2257 struct ieee80211_sub_if_data *sdata = rx->sdata;
2258 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2261 hdr = (struct ieee80211_hdr *) skb->data;
2262 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2264 /* make sure fixed part of mesh header is there, also checks skb len */
2265 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2266 return RX_DROP_MONITOR;
2268 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2270 /* make sure full mesh header is there, also checks skb len */
2271 if (!pskb_may_pull(rx->skb,
2272 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2273 return RX_DROP_MONITOR;
2275 /* reload pointers */
2276 hdr = (struct ieee80211_hdr *) skb->data;
2277 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2279 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2280 return RX_DROP_MONITOR;
2282 /* frame is in RMC, don't forward */
2283 if (ieee80211_is_data(hdr->frame_control) &&
2284 is_multicast_ether_addr(hdr->addr1) &&
2285 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2286 return RX_DROP_MONITOR;
2288 if (!ieee80211_is_data(hdr->frame_control))
2292 return RX_DROP_MONITOR;
2294 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2295 struct mesh_path *mppath;
2299 if (is_multicast_ether_addr(hdr->addr1)) {
2300 mpp_addr = hdr->addr3;
2301 proxied_addr = mesh_hdr->eaddr1;
2302 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2303 /* has_a4 already checked in ieee80211_rx_mesh_check */
2304 mpp_addr = hdr->addr4;
2305 proxied_addr = mesh_hdr->eaddr2;
2307 return RX_DROP_MONITOR;
2311 mppath = mpp_path_lookup(sdata, proxied_addr);
2313 mpp_path_add(sdata, proxied_addr, mpp_addr);
2315 spin_lock_bh(&mppath->state_lock);
2316 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2317 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2318 spin_unlock_bh(&mppath->state_lock);
2323 /* Frame has reached destination. Don't forward */
2324 if (!is_multicast_ether_addr(hdr->addr1) &&
2325 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2328 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2329 q = sdata->vif.hw_queue[ac];
2330 if (ieee80211_queue_stopped(&local->hw, q)) {
2331 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2332 return RX_DROP_MONITOR;
2334 skb_set_queue_mapping(skb, q);
2336 if (!--mesh_hdr->ttl) {
2337 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2341 if (!ifmsh->mshcfg.dot11MeshForwarding)
2344 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2346 net_info_ratelimited("%s: failed to clone mesh frame\n",
2351 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2352 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2353 info = IEEE80211_SKB_CB(fwd_skb);
2354 memset(info, 0, sizeof(*info));
2355 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2356 info->control.vif = &rx->sdata->vif;
2357 info->control.jiffies = jiffies;
2358 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2359 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2360 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2361 /* update power mode indication when forwarding */
2362 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2363 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2364 /* mesh power mode flags updated in mesh_nexthop_lookup */
2365 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2367 /* unable to resolve next hop */
2368 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2370 WLAN_REASON_MESH_PATH_NOFORWARD,
2372 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2374 return RX_DROP_MONITOR;
2377 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2378 ieee80211_add_pending_skb(local, fwd_skb);
2380 if (is_multicast_ether_addr(hdr->addr1))
2382 return RX_DROP_MONITOR;
2386 static ieee80211_rx_result debug_noinline
2387 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2389 struct ieee80211_sub_if_data *sdata = rx->sdata;
2390 struct ieee80211_local *local = rx->local;
2391 struct net_device *dev = sdata->dev;
2392 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2393 __le16 fc = hdr->frame_control;
2397 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2400 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2401 return RX_DROP_MONITOR;
2404 /* The seqno index has the same property as needed
2405 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2406 * for non-QoS-data frames. Here we know it's a data
2407 * frame, so count MSDUs.
2409 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2413 * Send unexpected-4addr-frame event to hostapd. For older versions,
2414 * also drop the frame to cooked monitor interfaces.
2416 if (ieee80211_has_a4(hdr->frame_control) &&
2417 sdata->vif.type == NL80211_IFTYPE_AP) {
2419 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2420 cfg80211_rx_unexpected_4addr_frame(
2421 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2422 return RX_DROP_MONITOR;
2425 err = __ieee80211_data_to_8023(rx, &port_control);
2427 return RX_DROP_UNUSABLE;
2429 if (!ieee80211_frame_allowed(rx, fc))
2430 return RX_DROP_MONITOR;
2432 /* directly handle TDLS channel switch requests/responses */
2433 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2434 cpu_to_be16(ETH_P_TDLS))) {
2435 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2437 if (pskb_may_pull(rx->skb,
2438 offsetof(struct ieee80211_tdls_data, u)) &&
2439 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2440 tf->category == WLAN_CATEGORY_TDLS &&
2441 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2442 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2443 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2444 schedule_work(&local->tdls_chsw_work);
2446 rx->sta->rx_stats.packets++;
2452 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2453 unlikely(port_control) && sdata->bss) {
2454 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2462 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2463 !is_multicast_ether_addr(
2464 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2465 (!local->scanning &&
2466 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2467 mod_timer(&local->dynamic_ps_timer, jiffies +
2468 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2471 ieee80211_deliver_skb(rx);
2476 static ieee80211_rx_result debug_noinline
2477 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2479 struct sk_buff *skb = rx->skb;
2480 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2481 struct tid_ampdu_rx *tid_agg_rx;
2485 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2488 if (ieee80211_is_back_req(bar->frame_control)) {
2490 __le16 control, start_seq_num;
2491 } __packed bar_data;
2492 struct ieee80211_event event = {
2493 .type = BAR_RX_EVENT,
2497 return RX_DROP_MONITOR;
2499 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2500 &bar_data, sizeof(bar_data)))
2501 return RX_DROP_MONITOR;
2503 tid = le16_to_cpu(bar_data.control) >> 12;
2505 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2507 return RX_DROP_MONITOR;
2509 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2510 event.u.ba.tid = tid;
2511 event.u.ba.ssn = start_seq_num;
2512 event.u.ba.sta = &rx->sta->sta;
2514 /* reset session timer */
2515 if (tid_agg_rx->timeout)
2516 mod_timer(&tid_agg_rx->session_timer,
2517 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2519 spin_lock(&tid_agg_rx->reorder_lock);
2520 /* release stored frames up to start of BAR */
2521 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2522 start_seq_num, frames);
2523 spin_unlock(&tid_agg_rx->reorder_lock);
2525 drv_event_callback(rx->local, rx->sdata, &event);
2532 * After this point, we only want management frames,
2533 * so we can drop all remaining control frames to
2534 * cooked monitor interfaces.
2536 return RX_DROP_MONITOR;
2539 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2540 struct ieee80211_mgmt *mgmt,
2543 struct ieee80211_local *local = sdata->local;
2544 struct sk_buff *skb;
2545 struct ieee80211_mgmt *resp;
2547 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2548 /* Not to own unicast address */
2552 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2553 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2554 /* Not from the current AP or not associated yet. */
2558 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2559 /* Too short SA Query request frame */
2563 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2567 skb_reserve(skb, local->hw.extra_tx_headroom);
2568 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2569 memset(resp, 0, 24);
2570 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2571 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2572 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2573 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2574 IEEE80211_STYPE_ACTION);
2575 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2576 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2577 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2578 memcpy(resp->u.action.u.sa_query.trans_id,
2579 mgmt->u.action.u.sa_query.trans_id,
2580 WLAN_SA_QUERY_TR_ID_LEN);
2582 ieee80211_tx_skb(sdata, skb);
2585 static ieee80211_rx_result debug_noinline
2586 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2588 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2589 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2592 * From here on, look only at management frames.
2593 * Data and control frames are already handled,
2594 * and unknown (reserved) frames are useless.
2596 if (rx->skb->len < 24)
2597 return RX_DROP_MONITOR;
2599 if (!ieee80211_is_mgmt(mgmt->frame_control))
2600 return RX_DROP_MONITOR;
2602 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2603 ieee80211_is_beacon(mgmt->frame_control) &&
2604 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2607 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2608 sig = status->signal;
2610 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2611 rx->skb->data, rx->skb->len,
2613 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2616 if (ieee80211_drop_unencrypted_mgmt(rx))
2617 return RX_DROP_UNUSABLE;
2622 static ieee80211_rx_result debug_noinline
2623 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2625 struct ieee80211_local *local = rx->local;
2626 struct ieee80211_sub_if_data *sdata = rx->sdata;
2627 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2628 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2629 int len = rx->skb->len;
2631 if (!ieee80211_is_action(mgmt->frame_control))
2634 /* drop too small frames */
2635 if (len < IEEE80211_MIN_ACTION_SIZE)
2636 return RX_DROP_UNUSABLE;
2638 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2639 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2640 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2641 return RX_DROP_UNUSABLE;
2643 switch (mgmt->u.action.category) {
2644 case WLAN_CATEGORY_HT:
2645 /* reject HT action frames from stations not supporting HT */
2646 if (!rx->sta->sta.ht_cap.ht_supported)
2649 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2650 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2651 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2652 sdata->vif.type != NL80211_IFTYPE_AP &&
2653 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2656 /* verify action & smps_control/chanwidth are present */
2657 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2660 switch (mgmt->u.action.u.ht_smps.action) {
2661 case WLAN_HT_ACTION_SMPS: {
2662 struct ieee80211_supported_band *sband;
2663 enum ieee80211_smps_mode smps_mode;
2665 /* convert to HT capability */
2666 switch (mgmt->u.action.u.ht_smps.smps_control) {
2667 case WLAN_HT_SMPS_CONTROL_DISABLED:
2668 smps_mode = IEEE80211_SMPS_OFF;
2670 case WLAN_HT_SMPS_CONTROL_STATIC:
2671 smps_mode = IEEE80211_SMPS_STATIC;
2673 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2674 smps_mode = IEEE80211_SMPS_DYNAMIC;
2680 /* if no change do nothing */
2681 if (rx->sta->sta.smps_mode == smps_mode)
2683 rx->sta->sta.smps_mode = smps_mode;
2685 sband = rx->local->hw.wiphy->bands[status->band];
2687 rate_control_rate_update(local, sband, rx->sta,
2688 IEEE80211_RC_SMPS_CHANGED);
2691 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2692 struct ieee80211_supported_band *sband;
2693 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2694 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2696 /* If it doesn't support 40 MHz it can't change ... */
2697 if (!(rx->sta->sta.ht_cap.cap &
2698 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2701 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2702 max_bw = IEEE80211_STA_RX_BW_20;
2704 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2706 /* set cur_max_bandwidth and recalc sta bw */
2707 rx->sta->cur_max_bandwidth = max_bw;
2708 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2710 if (rx->sta->sta.bandwidth == new_bw)
2713 rx->sta->sta.bandwidth = new_bw;
2714 sband = rx->local->hw.wiphy->bands[status->band];
2716 rate_control_rate_update(local, sband, rx->sta,
2717 IEEE80211_RC_BW_CHANGED);
2725 case WLAN_CATEGORY_PUBLIC:
2726 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2728 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2732 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2734 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2735 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2737 if (len < offsetof(struct ieee80211_mgmt,
2738 u.action.u.ext_chan_switch.variable))
2741 case WLAN_CATEGORY_VHT:
2742 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2743 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2744 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2745 sdata->vif.type != NL80211_IFTYPE_AP &&
2746 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2749 /* verify action code is present */
2750 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2753 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2754 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2757 /* verify opmode is present */
2758 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2761 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2763 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2764 opmode, status->band);
2771 case WLAN_CATEGORY_BACK:
2772 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2773 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2774 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2775 sdata->vif.type != NL80211_IFTYPE_AP &&
2776 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2779 /* verify action_code is present */
2780 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2783 switch (mgmt->u.action.u.addba_req.action_code) {
2784 case WLAN_ACTION_ADDBA_REQ:
2785 if (len < (IEEE80211_MIN_ACTION_SIZE +
2786 sizeof(mgmt->u.action.u.addba_req)))
2789 case WLAN_ACTION_ADDBA_RESP:
2790 if (len < (IEEE80211_MIN_ACTION_SIZE +
2791 sizeof(mgmt->u.action.u.addba_resp)))
2794 case WLAN_ACTION_DELBA:
2795 if (len < (IEEE80211_MIN_ACTION_SIZE +
2796 sizeof(mgmt->u.action.u.delba)))
2804 case WLAN_CATEGORY_SPECTRUM_MGMT:
2805 /* verify action_code is present */
2806 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2809 switch (mgmt->u.action.u.measurement.action_code) {
2810 case WLAN_ACTION_SPCT_MSR_REQ:
2811 if (status->band != IEEE80211_BAND_5GHZ)
2814 if (len < (IEEE80211_MIN_ACTION_SIZE +
2815 sizeof(mgmt->u.action.u.measurement)))
2818 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2821 ieee80211_process_measurement_req(sdata, mgmt, len);
2823 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2825 if (len < (IEEE80211_MIN_ACTION_SIZE +
2826 sizeof(mgmt->u.action.u.chan_switch)))
2829 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2830 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2831 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2834 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2835 bssid = sdata->u.mgd.bssid;
2836 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2837 bssid = sdata->u.ibss.bssid;
2838 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2843 if (!ether_addr_equal(mgmt->bssid, bssid))
2850 case WLAN_CATEGORY_SA_QUERY:
2851 if (len < (IEEE80211_MIN_ACTION_SIZE +
2852 sizeof(mgmt->u.action.u.sa_query)))
2855 switch (mgmt->u.action.u.sa_query.action) {
2856 case WLAN_ACTION_SA_QUERY_REQUEST:
2857 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2859 ieee80211_process_sa_query_req(sdata, mgmt, len);
2863 case WLAN_CATEGORY_SELF_PROTECTED:
2864 if (len < (IEEE80211_MIN_ACTION_SIZE +
2865 sizeof(mgmt->u.action.u.self_prot.action_code)))
2868 switch (mgmt->u.action.u.self_prot.action_code) {
2869 case WLAN_SP_MESH_PEERING_OPEN:
2870 case WLAN_SP_MESH_PEERING_CLOSE:
2871 case WLAN_SP_MESH_PEERING_CONFIRM:
2872 if (!ieee80211_vif_is_mesh(&sdata->vif))
2874 if (sdata->u.mesh.user_mpm)
2875 /* userspace handles this frame */
2878 case WLAN_SP_MGK_INFORM:
2879 case WLAN_SP_MGK_ACK:
2880 if (!ieee80211_vif_is_mesh(&sdata->vif))
2885 case WLAN_CATEGORY_MESH_ACTION:
2886 if (len < (IEEE80211_MIN_ACTION_SIZE +
2887 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2890 if (!ieee80211_vif_is_mesh(&sdata->vif))
2892 if (mesh_action_is_path_sel(mgmt) &&
2893 !mesh_path_sel_is_hwmp(sdata))
2901 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2902 /* will return in the next handlers */
2907 rx->sta->rx_stats.packets++;
2908 dev_kfree_skb(rx->skb);
2912 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2913 skb_queue_tail(&sdata->skb_queue, rx->skb);
2914 ieee80211_queue_work(&local->hw, &sdata->work);
2916 rx->sta->rx_stats.packets++;
2920 static ieee80211_rx_result debug_noinline
2921 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2923 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2926 /* skip known-bad action frames and return them in the next handler */
2927 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2931 * Getting here means the kernel doesn't know how to handle
2932 * it, but maybe userspace does ... include returned frames
2933 * so userspace can register for those to know whether ones
2934 * it transmitted were processed or returned.
2937 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2938 sig = status->signal;
2940 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2941 rx->skb->data, rx->skb->len, 0)) {
2943 rx->sta->rx_stats.packets++;
2944 dev_kfree_skb(rx->skb);
2951 static ieee80211_rx_result debug_noinline
2952 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2954 struct ieee80211_local *local = rx->local;
2955 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2956 struct sk_buff *nskb;
2957 struct ieee80211_sub_if_data *sdata = rx->sdata;
2958 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2960 if (!ieee80211_is_action(mgmt->frame_control))
2964 * For AP mode, hostapd is responsible for handling any action
2965 * frames that we didn't handle, including returning unknown
2966 * ones. For all other modes we will return them to the sender,
2967 * setting the 0x80 bit in the action category, as required by
2968 * 802.11-2012 9.24.4.
2969 * Newer versions of hostapd shall also use the management frame
2970 * registration mechanisms, but older ones still use cooked
2971 * monitor interfaces so push all frames there.
2973 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2974 (sdata->vif.type == NL80211_IFTYPE_AP ||
2975 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2976 return RX_DROP_MONITOR;
2978 if (is_multicast_ether_addr(mgmt->da))
2979 return RX_DROP_MONITOR;
2981 /* do not return rejected action frames */
2982 if (mgmt->u.action.category & 0x80)
2983 return RX_DROP_UNUSABLE;
2985 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2988 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2990 nmgmt->u.action.category |= 0x80;
2991 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2992 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2994 memset(nskb->cb, 0, sizeof(nskb->cb));
2996 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2997 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2999 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3000 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3001 IEEE80211_TX_CTL_NO_CCK_RATE;
3002 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3004 local->hw.offchannel_tx_hw_queue;
3007 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3010 dev_kfree_skb(rx->skb);
3014 static ieee80211_rx_result debug_noinline
3015 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3017 struct ieee80211_sub_if_data *sdata = rx->sdata;
3018 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3021 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3023 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3024 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3025 sdata->vif.type != NL80211_IFTYPE_OCB &&
3026 sdata->vif.type != NL80211_IFTYPE_STATION)
3027 return RX_DROP_MONITOR;
3030 case cpu_to_le16(IEEE80211_STYPE_AUTH):
3031 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3032 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3033 /* process for all: mesh, mlme, ibss */
3035 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3036 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3037 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3038 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3039 if (is_multicast_ether_addr(mgmt->da) &&
3040 !is_broadcast_ether_addr(mgmt->da))
3041 return RX_DROP_MONITOR;
3043 /* process only for station */
3044 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3045 return RX_DROP_MONITOR;
3047 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3048 /* process only for ibss and mesh */
3049 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3050 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3051 return RX_DROP_MONITOR;
3054 return RX_DROP_MONITOR;
3057 /* queue up frame and kick off work to process it */
3058 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3059 skb_queue_tail(&sdata->skb_queue, rx->skb);
3060 ieee80211_queue_work(&rx->local->hw, &sdata->work);
3062 rx->sta->rx_stats.packets++;
3067 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3068 struct ieee80211_rate *rate)
3070 struct ieee80211_sub_if_data *sdata;
3071 struct ieee80211_local *local = rx->local;
3072 struct sk_buff *skb = rx->skb, *skb2;
3073 struct net_device *prev_dev = NULL;
3074 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3075 int needed_headroom;
3078 * If cooked monitor has been processed already, then
3079 * don't do it again. If not, set the flag.
3081 if (rx->flags & IEEE80211_RX_CMNTR)
3083 rx->flags |= IEEE80211_RX_CMNTR;
3085 /* If there are no cooked monitor interfaces, just free the SKB */
3086 if (!local->cooked_mntrs)
3089 /* vendor data is long removed here */
3090 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3091 /* room for the radiotap header based on driver features */
3092 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3094 if (skb_headroom(skb) < needed_headroom &&
3095 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3098 /* prepend radiotap information */
3099 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3102 skb_set_mac_header(skb, 0);
3103 skb->ip_summed = CHECKSUM_UNNECESSARY;
3104 skb->pkt_type = PACKET_OTHERHOST;
3105 skb->protocol = htons(ETH_P_802_2);
3107 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3108 if (!ieee80211_sdata_running(sdata))
3111 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3112 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3116 skb2 = skb_clone(skb, GFP_ATOMIC);
3118 skb2->dev = prev_dev;
3119 netif_receive_skb(skb2);
3123 prev_dev = sdata->dev;
3124 ieee80211_rx_stats(sdata->dev, skb->len);
3128 skb->dev = prev_dev;
3129 netif_receive_skb(skb);
3137 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3138 ieee80211_rx_result res)
3141 case RX_DROP_MONITOR:
3142 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3144 rx->sta->rx_stats.dropped++;
3147 struct ieee80211_rate *rate = NULL;
3148 struct ieee80211_supported_band *sband;
3149 struct ieee80211_rx_status *status;
3151 status = IEEE80211_SKB_RXCB((rx->skb));
3153 sband = rx->local->hw.wiphy->bands[status->band];
3154 if (!(status->flag & RX_FLAG_HT) &&
3155 !(status->flag & RX_FLAG_VHT))
3156 rate = &sband->bitrates[status->rate_idx];
3158 ieee80211_rx_cooked_monitor(rx, rate);
3161 case RX_DROP_UNUSABLE:
3162 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3164 rx->sta->rx_stats.dropped++;
3165 dev_kfree_skb(rx->skb);
3168 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3173 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3174 struct sk_buff_head *frames)
3176 ieee80211_rx_result res = RX_DROP_MONITOR;
3177 struct sk_buff *skb;
3179 #define CALL_RXH(rxh) \
3182 if (res != RX_CONTINUE) \
3186 /* Lock here to avoid hitting all of the data used in the RX
3187 * path (e.g. key data, station data, ...) concurrently when
3188 * a frame is released from the reorder buffer due to timeout
3189 * from the timer, potentially concurrently with RX from the
3192 spin_lock_bh(&rx->local->rx_path_lock);
3194 while ((skb = __skb_dequeue(frames))) {
3196 * all the other fields are valid across frames
3197 * that belong to an aMPDU since they are on the
3198 * same TID from the same station
3202 CALL_RXH(ieee80211_rx_h_check_more_data)
3203 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
3204 CALL_RXH(ieee80211_rx_h_sta_process)
3205 CALL_RXH(ieee80211_rx_h_decrypt)
3206 CALL_RXH(ieee80211_rx_h_defragment)
3207 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3208 /* must be after MMIC verify so header is counted in MPDU mic */
3209 #ifdef CONFIG_MAC80211_MESH
3210 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3211 CALL_RXH(ieee80211_rx_h_mesh_fwding);
3213 CALL_RXH(ieee80211_rx_h_amsdu)
3214 CALL_RXH(ieee80211_rx_h_data)
3216 /* special treatment -- needs the queue */
3217 res = ieee80211_rx_h_ctrl(rx, frames);
3218 if (res != RX_CONTINUE)
3221 CALL_RXH(ieee80211_rx_h_mgmt_check)
3222 CALL_RXH(ieee80211_rx_h_action)
3223 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3224 CALL_RXH(ieee80211_rx_h_action_return)
3225 CALL_RXH(ieee80211_rx_h_mgmt)
3228 ieee80211_rx_handlers_result(rx, res);
3233 spin_unlock_bh(&rx->local->rx_path_lock);
3236 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3238 struct sk_buff_head reorder_release;
3239 ieee80211_rx_result res = RX_DROP_MONITOR;
3241 __skb_queue_head_init(&reorder_release);
3243 #define CALL_RXH(rxh) \
3246 if (res != RX_CONTINUE) \
3250 CALL_RXH(ieee80211_rx_h_check_dup)
3251 CALL_RXH(ieee80211_rx_h_check)
3253 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3255 ieee80211_rx_handlers(rx, &reorder_release);
3259 ieee80211_rx_handlers_result(rx, res);
3265 * This function makes calls into the RX path, therefore
3266 * it has to be invoked under RCU read lock.
3268 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3270 struct sk_buff_head frames;
3271 struct ieee80211_rx_data rx = {
3273 .sdata = sta->sdata,
3274 .local = sta->local,
3275 /* This is OK -- must be QoS data frame */
3276 .security_idx = tid,
3278 .napi = NULL, /* must be NULL to not have races */
3280 struct tid_ampdu_rx *tid_agg_rx;
3282 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3286 __skb_queue_head_init(&frames);
3288 spin_lock(&tid_agg_rx->reorder_lock);
3289 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3290 spin_unlock(&tid_agg_rx->reorder_lock);
3292 if (!skb_queue_empty(&frames)) {
3293 struct ieee80211_event event = {
3294 .type = BA_FRAME_TIMEOUT,
3296 .u.ba.sta = &sta->sta,
3298 drv_event_callback(rx.local, rx.sdata, &event);
3301 ieee80211_rx_handlers(&rx, &frames);
3304 /* main receive path */
3306 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3308 struct ieee80211_sub_if_data *sdata = rx->sdata;
3309 struct sk_buff *skb = rx->skb;
3310 struct ieee80211_hdr *hdr = (void *)skb->data;
3311 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3312 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3313 int multicast = is_multicast_ether_addr(hdr->addr1);
3315 switch (sdata->vif.type) {
3316 case NL80211_IFTYPE_STATION:
3317 if (!bssid && !sdata->u.mgd.use_4addr)
3321 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3322 case NL80211_IFTYPE_ADHOC:
3325 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3326 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3328 if (ieee80211_is_beacon(hdr->frame_control))
3330 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3333 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3337 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3338 rate_idx = 0; /* TODO: HT/VHT rates */
3340 rate_idx = status->rate_idx;
3341 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3345 case NL80211_IFTYPE_OCB:
3348 if (!ieee80211_is_data_present(hdr->frame_control))
3350 if (!is_broadcast_ether_addr(bssid))
3353 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3357 if (status->flag & RX_FLAG_HT)
3358 rate_idx = 0; /* TODO: HT rates */
3360 rate_idx = status->rate_idx;
3361 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3365 case NL80211_IFTYPE_MESH_POINT:
3368 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3369 case NL80211_IFTYPE_AP_VLAN:
3370 case NL80211_IFTYPE_AP:
3372 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3374 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3376 * Accept public action frames even when the
3377 * BSSID doesn't match, this is used for P2P
3378 * and location updates. Note that mac80211
3379 * itself never looks at these frames.
3382 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3384 if (ieee80211_is_public_action(hdr, skb->len))
3386 return ieee80211_is_beacon(hdr->frame_control);
3389 if (!ieee80211_has_tods(hdr->frame_control)) {
3390 /* ignore data frames to TDLS-peers */
3391 if (ieee80211_is_data(hdr->frame_control))
3393 /* ignore action frames to TDLS-peers */
3394 if (ieee80211_is_action(hdr->frame_control) &&
3395 !is_broadcast_ether_addr(bssid) &&
3396 !ether_addr_equal(bssid, hdr->addr1))
3400 case NL80211_IFTYPE_WDS:
3401 if (bssid || !ieee80211_is_data(hdr->frame_control))
3403 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3404 case NL80211_IFTYPE_P2P_DEVICE:
3405 return ieee80211_is_public_action(hdr, skb->len) ||
3406 ieee80211_is_probe_req(hdr->frame_control) ||
3407 ieee80211_is_probe_resp(hdr->frame_control) ||
3408 ieee80211_is_beacon(hdr->frame_control);
3418 * This function returns whether or not the SKB
3419 * was destined for RX processing or not, which,
3420 * if consume is true, is equivalent to whether
3421 * or not the skb was consumed.
3423 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3424 struct sk_buff *skb, bool consume)
3426 struct ieee80211_local *local = rx->local;
3427 struct ieee80211_sub_if_data *sdata = rx->sdata;
3431 if (!ieee80211_accept_frame(rx))
3435 skb = skb_copy(skb, GFP_ATOMIC);
3437 if (net_ratelimit())
3438 wiphy_debug(local->hw.wiphy,
3439 "failed to copy skb for %s\n",
3447 ieee80211_invoke_rx_handlers(rx);
3452 * This is the actual Rx frames handler. as it belongs to Rx path it must
3453 * be called with rcu_read_lock protection.
3455 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3456 struct sk_buff *skb,
3457 struct napi_struct *napi)
3459 struct ieee80211_local *local = hw_to_local(hw);
3460 struct ieee80211_sub_if_data *sdata;
3461 struct ieee80211_hdr *hdr;
3463 struct ieee80211_rx_data rx;
3464 struct ieee80211_sub_if_data *prev;
3465 struct sta_info *sta, *prev_sta;
3466 struct rhash_head *tmp;
3469 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3470 memset(&rx, 0, sizeof(rx));
3475 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3476 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
3478 if (ieee80211_is_mgmt(fc)) {
3479 /* drop frame if too short for header */
3480 if (skb->len < ieee80211_hdrlen(fc))
3483 err = skb_linearize(skb);
3485 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3493 hdr = (struct ieee80211_hdr *)skb->data;
3494 ieee80211_parse_qos(&rx);
3495 ieee80211_verify_alignment(&rx);
3497 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3498 ieee80211_is_beacon(hdr->frame_control)))
3499 ieee80211_scan_rx(local, skb);
3501 if (ieee80211_is_data(fc)) {
3502 const struct bucket_table *tbl;
3506 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
3508 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
3515 rx.sdata = prev_sta->sdata;
3516 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3523 rx.sdata = prev_sta->sdata;
3525 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3533 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3534 if (!ieee80211_sdata_running(sdata))
3537 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3538 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3542 * frame is destined for this interface, but if it's
3543 * not also for the previous one we handle that after
3544 * the loop to avoid copying the SKB once too much
3552 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3554 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3560 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3563 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3572 * This is the receive path handler. It is called by a low level driver when an
3573 * 802.11 MPDU is received from the hardware.
3575 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct sk_buff *skb,
3576 struct napi_struct *napi)
3578 struct ieee80211_local *local = hw_to_local(hw);
3579 struct ieee80211_rate *rate = NULL;
3580 struct ieee80211_supported_band *sband;
3581 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3583 WARN_ON_ONCE_NONRT(softirq_count() == 0);
3585 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3588 sband = local->hw.wiphy->bands[status->band];
3589 if (WARN_ON(!sband))
3593 * If we're suspending, it is possible although not too likely
3594 * that we'd be receiving frames after having already partially
3595 * quiesced the stack. We can't process such frames then since
3596 * that might, for example, cause stations to be added or other
3597 * driver callbacks be invoked.
3599 if (unlikely(local->quiescing || local->suspended))
3602 /* We might be during a HW reconfig, prevent Rx for the same reason */
3603 if (unlikely(local->in_reconfig))
3607 * The same happens when we're not even started,
3608 * but that's worth a warning.
3610 if (WARN_ON(!local->started))
3613 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3615 * Validate the rate, unless a PLCP error means that
3616 * we probably can't have a valid rate here anyway.
3619 if (status->flag & RX_FLAG_HT) {
3621 * rate_idx is MCS index, which can be [0-76]
3624 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3626 * Anything else would be some sort of driver or
3627 * hardware error. The driver should catch hardware
3630 if (WARN(status->rate_idx > 76,
3631 "Rate marked as an HT rate but passed "
3632 "status->rate_idx is not "
3633 "an MCS index [0-76]: %d (0x%02x)\n",
3637 } else if (status->flag & RX_FLAG_VHT) {
3638 if (WARN_ONCE(status->rate_idx > 9 ||
3640 status->vht_nss > 8,
3641 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3642 status->rate_idx, status->vht_nss))
3645 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3647 rate = &sband->bitrates[status->rate_idx];
3651 status->rx_flags = 0;
3654 * key references and virtual interfaces are protected using RCU
3655 * and this requires that we are in a read-side RCU section during
3656 * receive processing
3661 * Frames with failed FCS/PLCP checksum are not returned,
3662 * all other frames are returned without radiotap header
3663 * if it was previously present.
3664 * Also, frames with less than 16 bytes are dropped.
3666 skb = ieee80211_rx_monitor(local, skb, rate);
3672 ieee80211_tpt_led_trig_rx(local,
3673 ((struct ieee80211_hdr *)skb->data)->frame_control,
3675 __ieee80211_rx_handle_packet(hw, skb, napi);
3683 EXPORT_SYMBOL(ieee80211_rx_napi);
3685 /* This is a version of the rx handler that can be called from hard irq
3686 * context. Post the skb on the queue and schedule the tasklet */
3687 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3689 struct ieee80211_local *local = hw_to_local(hw);
3691 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3693 skb->pkt_type = IEEE80211_RX_MSG;
3694 skb_queue_tail(&local->skb_queue, skb);
3695 tasklet_schedule(&local->tasklet);
3697 EXPORT_SYMBOL(ieee80211_rx_irqsafe);