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-rw-r--r--net/mac80211/rx.c5444
1 files changed, 5444 insertions, 0 deletions
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
new file mode 100644
index 0000000000..26ca2f5dc5
--- /dev/null
+++ b/net/mac80211/rx.c
@@ -0,0 +1,5444 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2002-2005, Instant802 Networks, Inc.
+ * Copyright 2005-2006, Devicescape Software, Inc.
+ * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
+ * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2013-2014 Intel Mobile Communications GmbH
+ * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
+ * Copyright (C) 2018-2023 Intel Corporation
+ */
+
+#include <linux/jiffies.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/rcupdate.h>
+#include <linux/export.h>
+#include <linux/kcov.h>
+#include <linux/bitops.h>
+#include <net/mac80211.h>
+#include <net/ieee80211_radiotap.h>
+#include <asm/unaligned.h>
+
+#include "ieee80211_i.h"
+#include "driver-ops.h"
+#include "led.h"
+#include "mesh.h"
+#include "wep.h"
+#include "wpa.h"
+#include "tkip.h"
+#include "wme.h"
+#include "rate.h"
+
+/*
+ * monitor mode reception
+ *
+ * This function cleans up the SKB, i.e. it removes all the stuff
+ * only useful for monitoring.
+ */
+static struct sk_buff *ieee80211_clean_skb(struct sk_buff *skb,
+ unsigned int present_fcs_len,
+ unsigned int rtap_space)
+{
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+ struct ieee80211_hdr *hdr;
+ unsigned int hdrlen;
+ __le16 fc;
+
+ if (present_fcs_len)
+ __pskb_trim(skb, skb->len - present_fcs_len);
+ pskb_pull(skb, rtap_space);
+
+ /* After pulling radiotap header, clear all flags that indicate
+ * info in skb->data.
+ */
+ status->flag &= ~(RX_FLAG_RADIOTAP_TLV_AT_END |
+ RX_FLAG_RADIOTAP_LSIG |
+ RX_FLAG_RADIOTAP_HE_MU |
+ RX_FLAG_RADIOTAP_HE);
+
+ hdr = (void *)skb->data;
+ fc = hdr->frame_control;
+
+ /*
+ * Remove the HT-Control field (if present) on management
+ * frames after we've sent the frame to monitoring. We
+ * (currently) don't need it, and don't properly parse
+ * frames with it present, due to the assumption of a
+ * fixed management header length.
+ */
+ if (likely(!ieee80211_is_mgmt(fc) || !ieee80211_has_order(fc)))
+ return skb;
+
+ hdrlen = ieee80211_hdrlen(fc);
+ hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_ORDER);
+
+ if (!pskb_may_pull(skb, hdrlen)) {
+ dev_kfree_skb(skb);
+ return NULL;
+ }
+
+ memmove(skb->data + IEEE80211_HT_CTL_LEN, skb->data,
+ hdrlen - IEEE80211_HT_CTL_LEN);
+ pskb_pull(skb, IEEE80211_HT_CTL_LEN);
+
+ return skb;
+}
+
+static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
+ unsigned int rtap_space)
+{
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+ struct ieee80211_hdr *hdr;
+
+ hdr = (void *)(skb->data + rtap_space);
+
+ if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
+ RX_FLAG_FAILED_PLCP_CRC |
+ RX_FLAG_ONLY_MONITOR |
+ RX_FLAG_NO_PSDU))
+ return true;
+
+ if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
+ return true;
+
+ if (ieee80211_is_ctl(hdr->frame_control) &&
+ !ieee80211_is_pspoll(hdr->frame_control) &&
+ !ieee80211_is_back_req(hdr->frame_control))
+ return true;
+
+ return false;
+}
+
+static int
+ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
+ struct ieee80211_rx_status *status,
+ struct sk_buff *skb)
+{
+ int len;
+
+ /* always present fields */
+ len = sizeof(struct ieee80211_radiotap_header) + 8;
+
+ /* allocate extra bitmaps */
+ if (status->chains)
+ len += 4 * hweight8(status->chains);
+
+ if (ieee80211_have_rx_timestamp(status)) {
+ len = ALIGN(len, 8);
+ len += 8;
+ }
+ if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
+ len += 1;
+
+ /* antenna field, if we don't have per-chain info */
+ if (!status->chains)
+ len += 1;
+
+ /* padding for RX_FLAGS if necessary */
+ len = ALIGN(len, 2);
+
+ if (status->encoding == RX_ENC_HT) /* HT info */
+ len += 3;
+
+ if (status->flag & RX_FLAG_AMPDU_DETAILS) {
+ len = ALIGN(len, 4);
+ len += 8;
+ }
+
+ if (status->encoding == RX_ENC_VHT) {
+ len = ALIGN(len, 2);
+ len += 12;
+ }
+
+ if (local->hw.radiotap_timestamp.units_pos >= 0) {
+ len = ALIGN(len, 8);
+ len += 12;
+ }
+
+ if (status->encoding == RX_ENC_HE &&
+ status->flag & RX_FLAG_RADIOTAP_HE) {
+ len = ALIGN(len, 2);
+ len += 12;
+ BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
+ }
+
+ if (status->encoding == RX_ENC_HE &&
+ status->flag & RX_FLAG_RADIOTAP_HE_MU) {
+ len = ALIGN(len, 2);
+ len += 12;
+ BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
+ }
+
+ if (status->flag & RX_FLAG_NO_PSDU)
+ len += 1;
+
+ if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
+ len = ALIGN(len, 2);
+ len += 4;
+ BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
+ }
+
+ if (status->chains) {
+ /* antenna and antenna signal fields */
+ len += 2 * hweight8(status->chains);
+ }
+
+ if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) {
+ int tlv_offset = 0;
+
+ /*
+ * The position to look at depends on the existence (or non-
+ * existence) of other elements, so take that into account...
+ */
+ if (status->flag & RX_FLAG_RADIOTAP_HE)
+ tlv_offset +=
+ sizeof(struct ieee80211_radiotap_he);
+ if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
+ tlv_offset +=
+ sizeof(struct ieee80211_radiotap_he_mu);
+ if (status->flag & RX_FLAG_RADIOTAP_LSIG)
+ tlv_offset +=
+ sizeof(struct ieee80211_radiotap_lsig);
+
+ /* ensure 4 byte alignment for TLV */
+ len = ALIGN(len, 4);
+
+ /* TLVs until the mac header */
+ len += skb_mac_header(skb) - &skb->data[tlv_offset];
+ }
+
+ return len;
+}
+
+static void __ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
+ int link_id,
+ struct sta_info *sta,
+ struct sk_buff *skb)
+{
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+
+ if (link_id >= 0) {
+ status->link_valid = 1;
+ status->link_id = link_id;
+ } else {
+ status->link_valid = 0;
+ }
+
+ skb_queue_tail(&sdata->skb_queue, skb);
+ wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
+ if (sta)
+ sta->deflink.rx_stats.packets++;
+}
+
+static void ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
+ int link_id,
+ struct sta_info *sta,
+ struct sk_buff *skb)
+{
+ skb->protocol = 0;
+ __ieee80211_queue_skb_to_iface(sdata, link_id, sta, skb);
+}
+
+static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb,
+ int rtap_space)
+{
+ struct {
+ struct ieee80211_hdr_3addr hdr;
+ u8 category;
+ u8 action_code;
+ } __packed __aligned(2) action;
+
+ if (!sdata)
+ return;
+
+ BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
+
+ if (skb->len < rtap_space + sizeof(action) +
+ VHT_MUMIMO_GROUPS_DATA_LEN)
+ return;
+
+ if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
+ return;
+
+ skb_copy_bits(skb, rtap_space, &action, sizeof(action));
+
+ if (!ieee80211_is_action(action.hdr.frame_control))
+ return;
+
+ if (action.category != WLAN_CATEGORY_VHT)
+ return;
+
+ if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
+ return;
+
+ if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
+ return;
+
+ skb = skb_copy(skb, GFP_ATOMIC);
+ if (!skb)
+ return;
+
+ ieee80211_queue_skb_to_iface(sdata, -1, NULL, skb);
+}
+
+/*
+ * ieee80211_add_rx_radiotap_header - add radiotap header
+ *
+ * add a radiotap header containing all the fields which the hardware provided.
+ */
+static void
+ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
+ struct sk_buff *skb,
+ struct ieee80211_rate *rate,
+ int rtap_len, bool has_fcs)
+{
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+ struct ieee80211_radiotap_header *rthdr;
+ unsigned char *pos;
+ __le32 *it_present;
+ u32 it_present_val;
+ u16 rx_flags = 0;
+ u16 channel_flags = 0;
+ u32 tlvs_len = 0;
+ int mpdulen, chain;
+ unsigned long chains = status->chains;
+ struct ieee80211_radiotap_he he = {};
+ struct ieee80211_radiotap_he_mu he_mu = {};
+ struct ieee80211_radiotap_lsig lsig = {};
+
+ if (status->flag & RX_FLAG_RADIOTAP_HE) {
+ he = *(struct ieee80211_radiotap_he *)skb->data;
+ skb_pull(skb, sizeof(he));
+ WARN_ON_ONCE(status->encoding != RX_ENC_HE);
+ }
+
+ if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
+ he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
+ skb_pull(skb, sizeof(he_mu));
+ }
+
+ if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
+ lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
+ skb_pull(skb, sizeof(lsig));
+ }
+
+ if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) {
+ /* data is pointer at tlv all other info was pulled off */
+ tlvs_len = skb_mac_header(skb) - skb->data;
+ }
+
+ mpdulen = skb->len;
+ if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
+ mpdulen += FCS_LEN;
+
+ rthdr = skb_push(skb, rtap_len - tlvs_len);
+ memset(rthdr, 0, rtap_len - tlvs_len);
+ it_present = &rthdr->it_present;
+
+ /* radiotap header, set always present flags */
+ rthdr->it_len = cpu_to_le16(rtap_len);
+ it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
+ BIT(IEEE80211_RADIOTAP_CHANNEL) |
+ BIT(IEEE80211_RADIOTAP_RX_FLAGS);
+
+ if (!status->chains)
+ it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
+
+ for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
+ it_present_val |=
+ BIT(IEEE80211_RADIOTAP_EXT) |
+ BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
+ put_unaligned_le32(it_present_val, it_present);
+ it_present++;
+ it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
+ BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
+ }
+
+ if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END)
+ it_present_val |= BIT(IEEE80211_RADIOTAP_TLV);
+
+ put_unaligned_le32(it_present_val, it_present);
+
+ /* This references through an offset into it_optional[] rather
+ * than via it_present otherwise later uses of pos will cause
+ * the compiler to think we have walked past the end of the
+ * struct member.
+ */
+ pos = (void *)&rthdr->it_optional[it_present + 1 - rthdr->it_optional];
+
+ /* the order of the following fields is important */
+
+ /* IEEE80211_RADIOTAP_TSFT */
+ if (ieee80211_have_rx_timestamp(status)) {
+ /* padding */
+ while ((pos - (u8 *)rthdr) & 7)
+ *pos++ = 0;
+ put_unaligned_le64(
+ ieee80211_calculate_rx_timestamp(local, status,
+ mpdulen, 0),
+ pos);
+ rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_TSFT));
+ pos += 8;
+ }
+
+ /* IEEE80211_RADIOTAP_FLAGS */
+ if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
+ *pos |= IEEE80211_RADIOTAP_F_FCS;
+ if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
+ *pos |= IEEE80211_RADIOTAP_F_BADFCS;
+ if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
+ *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
+ pos++;
+
+ /* IEEE80211_RADIOTAP_RATE */
+ if (!rate || status->encoding != RX_ENC_LEGACY) {
+ /*
+ * Without rate information don't add it. If we have,
+ * MCS information is a separate field in radiotap,
+ * added below. The byte here is needed as padding
+ * for the channel though, so initialise it to 0.
+ */
+ *pos = 0;
+ } else {
+ int shift = 0;
+ rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE));
+ if (status->bw == RATE_INFO_BW_10)
+ shift = 1;
+ else if (status->bw == RATE_INFO_BW_5)
+ shift = 2;
+ *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
+ }
+ pos++;
+
+ /* IEEE80211_RADIOTAP_CHANNEL */
+ /* TODO: frequency offset in KHz */
+ put_unaligned_le16(status->freq, pos);
+ pos += 2;
+ if (status->bw == RATE_INFO_BW_10)
+ channel_flags |= IEEE80211_CHAN_HALF;
+ else if (status->bw == RATE_INFO_BW_5)
+ channel_flags |= IEEE80211_CHAN_QUARTER;
+
+ if (status->band == NL80211_BAND_5GHZ ||
+ status->band == NL80211_BAND_6GHZ)
+ channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
+ else if (status->encoding != RX_ENC_LEGACY)
+ channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
+ else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
+ channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
+ else if (rate)
+ channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
+ else
+ channel_flags |= IEEE80211_CHAN_2GHZ;
+ put_unaligned_le16(channel_flags, pos);
+ pos += 2;
+
+ /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
+ if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
+ !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
+ *pos = status->signal;
+ rthdr->it_present |=
+ cpu_to_le32(BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL));
+ pos++;
+ }
+
+ /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
+
+ if (!status->chains) {
+ /* IEEE80211_RADIOTAP_ANTENNA */
+ *pos = status->antenna;
+ pos++;
+ }
+
+ /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
+
+ /* IEEE80211_RADIOTAP_RX_FLAGS */
+ /* ensure 2 byte alignment for the 2 byte field as required */
+ if ((pos - (u8 *)rthdr) & 1)
+ *pos++ = 0;
+ if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
+ rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
+ put_unaligned_le16(rx_flags, pos);
+ pos += 2;
+
+ if (status->encoding == RX_ENC_HT) {
+ unsigned int stbc;
+
+ rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
+ *pos = local->hw.radiotap_mcs_details;
+ if (status->enc_flags & RX_ENC_FLAG_HT_GF)
+ *pos |= IEEE80211_RADIOTAP_MCS_HAVE_FMT;
+ if (status->enc_flags & RX_ENC_FLAG_LDPC)
+ *pos |= IEEE80211_RADIOTAP_MCS_HAVE_FEC;
+ pos++;
+ *pos = 0;
+ if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
+ *pos |= IEEE80211_RADIOTAP_MCS_SGI;
+ if (status->bw == RATE_INFO_BW_40)
+ *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
+ if (status->enc_flags & RX_ENC_FLAG_HT_GF)
+ *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
+ if (status->enc_flags & RX_ENC_FLAG_LDPC)
+ *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
+ stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
+ *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
+ pos++;
+ *pos++ = status->rate_idx;
+ }
+
+ if (status->flag & RX_FLAG_AMPDU_DETAILS) {
+ u16 flags = 0;
+
+ /* ensure 4 byte alignment */
+ while ((pos - (u8 *)rthdr) & 3)
+ pos++;
+ rthdr->it_present |=
+ cpu_to_le32(BIT(IEEE80211_RADIOTAP_AMPDU_STATUS));
+ put_unaligned_le32(status->ampdu_reference, pos);
+ pos += 4;
+ if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
+ flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
+ if (status->flag & RX_FLAG_AMPDU_IS_LAST)
+ flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
+ if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
+ flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
+ if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
+ flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
+ if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
+ flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
+ if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
+ flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
+ put_unaligned_le16(flags, pos);
+ pos += 2;
+ if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
+ *pos++ = status->ampdu_delimiter_crc;
+ else
+ *pos++ = 0;
+ *pos++ = 0;
+ }
+
+ if (status->encoding == RX_ENC_VHT) {
+ u16 known = local->hw.radiotap_vht_details;
+
+ rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
+ put_unaligned_le16(known, pos);
+ pos += 2;
+ /* flags */
+ if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
+ *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
+ /* in VHT, STBC is binary */
+ if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
+ *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
+ if (status->enc_flags & RX_ENC_FLAG_BF)
+ *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
+ pos++;
+ /* bandwidth */
+ switch (status->bw) {
+ case RATE_INFO_BW_80:
+ *pos++ = 4;
+ break;
+ case RATE_INFO_BW_160:
+ *pos++ = 11;
+ break;
+ case RATE_INFO_BW_40:
+ *pos++ = 1;
+ break;
+ default:
+ *pos++ = 0;
+ }
+ /* MCS/NSS */
+ *pos = (status->rate_idx << 4) | status->nss;
+ pos += 4;
+ /* coding field */
+ if (status->enc_flags & RX_ENC_FLAG_LDPC)
+ *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
+ pos++;
+ /* group ID */
+ pos++;
+ /* partial_aid */
+ pos += 2;
+ }
+
+ if (local->hw.radiotap_timestamp.units_pos >= 0) {
+ u16 accuracy = 0;
+ u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
+
+ rthdr->it_present |=
+ cpu_to_le32(BIT(IEEE80211_RADIOTAP_TIMESTAMP));
+
+ /* ensure 8 byte alignment */
+ while ((pos - (u8 *)rthdr) & 7)
+ pos++;
+
+ put_unaligned_le64(status->device_timestamp, pos);
+ pos += sizeof(u64);
+
+ if (local->hw.radiotap_timestamp.accuracy >= 0) {
+ accuracy = local->hw.radiotap_timestamp.accuracy;
+ flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
+ }
+ put_unaligned_le16(accuracy, pos);
+ pos += sizeof(u16);
+
+ *pos++ = local->hw.radiotap_timestamp.units_pos;
+ *pos++ = flags;
+ }
+
+ if (status->encoding == RX_ENC_HE &&
+ status->flag & RX_FLAG_RADIOTAP_HE) {
+#define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
+
+ if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
+ he.data6 |= HE_PREP(DATA6_NSTS,
+ FIELD_GET(RX_ENC_FLAG_STBC_MASK,
+ status->enc_flags));
+ he.data3 |= HE_PREP(DATA3_STBC, 1);
+ } else {
+ he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
+ }
+
+#define CHECK_GI(s) \
+ BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
+ (int)NL80211_RATE_INFO_HE_GI_##s)
+
+ CHECK_GI(0_8);
+ CHECK_GI(1_6);
+ CHECK_GI(3_2);
+
+ he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
+ he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
+ he.data3 |= HE_PREP(DATA3_CODING,
+ !!(status->enc_flags & RX_ENC_FLAG_LDPC));
+
+ he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
+
+ switch (status->bw) {
+ case RATE_INFO_BW_20:
+ he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
+ IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
+ break;
+ case RATE_INFO_BW_40:
+ he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
+ IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
+ break;
+ case RATE_INFO_BW_80:
+ he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
+ IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
+ break;
+ case RATE_INFO_BW_160:
+ he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
+ IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
+ break;
+ case RATE_INFO_BW_HE_RU:
+#define CHECK_RU_ALLOC(s) \
+ BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
+ NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
+
+ CHECK_RU_ALLOC(26);
+ CHECK_RU_ALLOC(52);
+ CHECK_RU_ALLOC(106);
+ CHECK_RU_ALLOC(242);
+ CHECK_RU_ALLOC(484);
+ CHECK_RU_ALLOC(996);
+ CHECK_RU_ALLOC(2x996);
+
+ he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
+ status->he_ru + 4);
+ break;
+ default:
+ WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
+ }
+
+ /* ensure 2 byte alignment */
+ while ((pos - (u8 *)rthdr) & 1)
+ pos++;
+ rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE));
+ memcpy(pos, &he, sizeof(he));
+ pos += sizeof(he);
+ }
+
+ if (status->encoding == RX_ENC_HE &&
+ status->flag & RX_FLAG_RADIOTAP_HE_MU) {
+ /* ensure 2 byte alignment */
+ while ((pos - (u8 *)rthdr) & 1)
+ pos++;
+ rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE_MU));
+ memcpy(pos, &he_mu, sizeof(he_mu));
+ pos += sizeof(he_mu);
+ }
+
+ if (status->flag & RX_FLAG_NO_PSDU) {
+ rthdr->it_present |=
+ cpu_to_le32(BIT(IEEE80211_RADIOTAP_ZERO_LEN_PSDU));
+ *pos++ = status->zero_length_psdu_type;
+ }
+
+ if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
+ /* ensure 2 byte alignment */
+ while ((pos - (u8 *)rthdr) & 1)
+ pos++;
+ rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_LSIG));
+ memcpy(pos, &lsig, sizeof(lsig));
+ pos += sizeof(lsig);
+ }
+
+ for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
+ *pos++ = status->chain_signal[chain];
+ *pos++ = chain;
+ }
+}
+
+static struct sk_buff *
+ieee80211_make_monitor_skb(struct ieee80211_local *local,
+ struct sk_buff **origskb,
+ struct ieee80211_rate *rate,
+ int rtap_space, bool use_origskb)
+{
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
+ int rt_hdrlen, needed_headroom;
+ struct sk_buff *skb;
+
+ /* room for the radiotap header based on driver features */
+ rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
+ needed_headroom = rt_hdrlen - rtap_space;
+
+ if (use_origskb) {
+ /* only need to expand headroom if necessary */
+ skb = *origskb;
+ *origskb = NULL;
+
+ /*
+ * This shouldn't trigger often because most devices have an
+ * RX header they pull before we get here, and that should
+ * be big enough for our radiotap information. We should
+ * probably export the length to drivers so that we can have
+ * them allocate enough headroom to start with.
+ */
+ if (skb_headroom(skb) < needed_headroom &&
+ pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
+ dev_kfree_skb(skb);
+ return NULL;
+ }
+ } else {
+ /*
+ * Need to make a copy and possibly remove radiotap header
+ * and FCS from the original.
+ */
+ skb = skb_copy_expand(*origskb, needed_headroom + NET_SKB_PAD,
+ 0, GFP_ATOMIC);
+
+ if (!skb)
+ return NULL;
+ }
+
+ /* prepend radiotap information */
+ ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
+
+ skb_reset_mac_header(skb);
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ skb->pkt_type = PACKET_OTHERHOST;
+ skb->protocol = htons(ETH_P_802_2);
+
+ return skb;
+}
+
+/*
+ * This function copies a received frame to all monitor interfaces and
+ * returns a cleaned-up SKB that no longer includes the FCS nor the
+ * radiotap header the driver might have added.
+ */
+static struct sk_buff *
+ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
+ struct ieee80211_rate *rate)
+{
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
+ struct ieee80211_sub_if_data *sdata;
+ struct sk_buff *monskb = NULL;
+ int present_fcs_len = 0;
+ unsigned int rtap_space = 0;
+ struct ieee80211_sub_if_data *monitor_sdata =
+ rcu_dereference(local->monitor_sdata);
+ bool only_monitor = false;
+ unsigned int min_head_len;
+
+ if (WARN_ON_ONCE(status->flag & RX_FLAG_RADIOTAP_TLV_AT_END &&
+ !skb_mac_header_was_set(origskb))) {
+ /* with this skb no way to know where frame payload starts */
+ dev_kfree_skb(origskb);
+ return NULL;
+ }
+
+ if (status->flag & RX_FLAG_RADIOTAP_HE)
+ rtap_space += sizeof(struct ieee80211_radiotap_he);
+
+ if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
+ rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
+
+ if (status->flag & RX_FLAG_RADIOTAP_LSIG)
+ rtap_space += sizeof(struct ieee80211_radiotap_lsig);
+
+ if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END)
+ rtap_space += skb_mac_header(origskb) - &origskb->data[rtap_space];
+
+ min_head_len = rtap_space;
+
+ /*
+ * First, we may need to make a copy of the skb because
+ * (1) we need to modify it for radiotap (if not present), and
+ * (2) the other RX handlers will modify the skb we got.
+ *
+ * We don't need to, of course, if we aren't going to return
+ * the SKB because it has a bad FCS/PLCP checksum.
+ */
+
+ if (!(status->flag & RX_FLAG_NO_PSDU)) {
+ if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
+ if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
+ /* driver bug */
+ WARN_ON(1);
+ dev_kfree_skb(origskb);
+ return NULL;
+ }
+ present_fcs_len = FCS_LEN;
+ }
+
+ /* also consider the hdr->frame_control */
+ min_head_len += 2;
+ }
+
+ /* ensure that the expected data elements are in skb head */
+ if (!pskb_may_pull(origskb, min_head_len)) {
+ dev_kfree_skb(origskb);
+ return NULL;
+ }
+
+ only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
+
+ if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
+ if (only_monitor) {
+ dev_kfree_skb(origskb);
+ return NULL;
+ }
+
+ return ieee80211_clean_skb(origskb, present_fcs_len,
+ rtap_space);
+ }
+
+ ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
+
+ list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
+ bool last_monitor = list_is_last(&sdata->u.mntr.list,
+ &local->mon_list);
+
+ if (!monskb)
+ monskb = ieee80211_make_monitor_skb(local, &origskb,
+ rate, rtap_space,
+ only_monitor &&
+ last_monitor);
+
+ if (monskb) {
+ struct sk_buff *skb;
+
+ if (last_monitor) {
+ skb = monskb;
+ monskb = NULL;
+ } else {
+ skb = skb_clone(monskb, GFP_ATOMIC);
+ }
+
+ if (skb) {
+ skb->dev = sdata->dev;
+ dev_sw_netstats_rx_add(skb->dev, skb->len);
+ netif_receive_skb(skb);
+ }
+ }
+
+ if (last_monitor)
+ break;
+ }
+
+ /* this happens if last_monitor was erroneously false */
+ dev_kfree_skb(monskb);
+
+ /* ditto */
+ if (!origskb)
+ return NULL;
+
+ return ieee80211_clean_skb(origskb, present_fcs_len, rtap_space);
+}
+
+static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+ int tid, seqno_idx, security_idx;
+
+ /* does the frame have a qos control field? */
+ if (ieee80211_is_data_qos(hdr->frame_control)) {
+ u8 *qc = ieee80211_get_qos_ctl(hdr);
+ /* frame has qos control */
+ tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
+ if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
+ status->rx_flags |= IEEE80211_RX_AMSDU;
+
+ seqno_idx = tid;
+ security_idx = tid;
+ } else {
+ /*
+ * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
+ *
+ * Sequence numbers for management frames, QoS data
+ * frames with a broadcast/multicast address in the
+ * Address 1 field, and all non-QoS data frames sent
+ * by QoS STAs are assigned using an additional single
+ * modulo-4096 counter, [...]
+ *
+ * We also use that counter for non-QoS STAs.
+ */
+ seqno_idx = IEEE80211_NUM_TIDS;
+ security_idx = 0;
+ if (ieee80211_is_mgmt(hdr->frame_control))
+ security_idx = IEEE80211_NUM_TIDS;
+ tid = 0;
+ }
+
+ rx->seqno_idx = seqno_idx;
+ rx->security_idx = security_idx;
+ /* Set skb->priority to 1d tag if highest order bit of TID is not set.
+ * For now, set skb->priority to 0 for other cases. */
+ rx->skb->priority = (tid > 7) ? 0 : tid;
+}
+
+/**
+ * DOC: Packet alignment
+ *
+ * Drivers always need to pass packets that are aligned to two-byte boundaries
+ * to the stack.
+ *
+ * Additionally, should, if possible, align the payload data in a way that
+ * guarantees that the contained IP header is aligned to a four-byte
+ * boundary. In the case of regular frames, this simply means aligning the
+ * payload to a four-byte boundary (because either the IP header is directly
+ * contained, or IV/RFC1042 headers that have a length divisible by four are
+ * in front of it). If the payload data is not properly aligned and the
+ * architecture doesn't support efficient unaligned operations, mac80211
+ * will align the data.
+ *
+ * With A-MSDU frames, however, the payload data address must yield two modulo
+ * four because there are 14-byte 802.3 headers within the A-MSDU frames that
+ * push the IP header further back to a multiple of four again. Thankfully, the
+ * specs were sane enough this time around to require padding each A-MSDU
+ * subframe to a length that is a multiple of four.
+ *
+ * Padding like Atheros hardware adds which is between the 802.11 header and
+ * the payload is not supported, the driver is required to move the 802.11
+ * header to be directly in front of the payload in that case.
+ */
+static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
+{
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+ WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
+#endif
+}
+
+
+/* rx handlers */
+
+static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
+{
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+
+ if (is_multicast_ether_addr(hdr->addr1))
+ return 0;
+
+ return ieee80211_is_robust_mgmt_frame(skb);
+}
+
+
+static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
+{
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+
+ if (!is_multicast_ether_addr(hdr->addr1))
+ return 0;
+
+ return ieee80211_is_robust_mgmt_frame(skb);
+}
+
+
+/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
+static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
+{
+ struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
+ struct ieee80211_mmie *mmie;
+ struct ieee80211_mmie_16 *mmie16;
+
+ if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
+ return -1;
+
+ if (!ieee80211_is_robust_mgmt_frame(skb) &&
+ !ieee80211_is_beacon(hdr->frame_control))
+ return -1; /* not a robust management frame */
+
+ mmie = (struct ieee80211_mmie *)
+ (skb->data + skb->len - sizeof(*mmie));
+ if (mmie->element_id == WLAN_EID_MMIE &&
+ mmie->length == sizeof(*mmie) - 2)
+ return le16_to_cpu(mmie->key_id);
+
+ mmie16 = (struct ieee80211_mmie_16 *)
+ (skb->data + skb->len - sizeof(*mmie16));
+ if (skb->len >= 24 + sizeof(*mmie16) &&
+ mmie16->element_id == WLAN_EID_MMIE &&
+ mmie16->length == sizeof(*mmie16) - 2)
+ return le16_to_cpu(mmie16->key_id);
+
+ return -1;
+}
+
+static int ieee80211_get_keyid(struct sk_buff *skb)
+{
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ __le16 fc = hdr->frame_control;
+ int hdrlen = ieee80211_hdrlen(fc);
+ u8 keyid;
+
+ /* WEP, TKIP, CCMP and GCMP */
+ if (unlikely(skb->len < hdrlen + IEEE80211_WEP_IV_LEN))
+ return -EINVAL;
+
+ skb_copy_bits(skb, hdrlen + 3, &keyid, 1);
+
+ keyid >>= 6;
+
+ return keyid;
+}
+
+static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+ char *dev_addr = rx->sdata->vif.addr;
+
+ if (ieee80211_is_data(hdr->frame_control)) {
+ if (is_multicast_ether_addr(hdr->addr1)) {
+ if (ieee80211_has_tods(hdr->frame_control) ||
+ !ieee80211_has_fromds(hdr->frame_control))
+ return RX_DROP_MONITOR;
+ if (ether_addr_equal(hdr->addr3, dev_addr))
+ return RX_DROP_MONITOR;
+ } else {
+ if (!ieee80211_has_a4(hdr->frame_control))
+ return RX_DROP_MONITOR;
+ if (ether_addr_equal(hdr->addr4, dev_addr))
+ return RX_DROP_MONITOR;
+ }
+ }
+
+ /* If there is not an established peer link and this is not a peer link
+ * establisment frame, beacon or probe, drop the frame.
+ */
+
+ if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
+ struct ieee80211_mgmt *mgmt;
+
+ if (!ieee80211_is_mgmt(hdr->frame_control))
+ return RX_DROP_MONITOR;
+
+ if (ieee80211_is_action(hdr->frame_control)) {
+ u8 category;
+
+ /* make sure category field is present */
+ if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
+ return RX_DROP_MONITOR;
+
+ mgmt = (struct ieee80211_mgmt *)hdr;
+ category = mgmt->u.action.category;
+ if (category != WLAN_CATEGORY_MESH_ACTION &&
+ category != WLAN_CATEGORY_SELF_PROTECTED)
+ return RX_DROP_MONITOR;
+ return RX_CONTINUE;
+ }
+
+ if (ieee80211_is_probe_req(hdr->frame_control) ||
+ ieee80211_is_probe_resp(hdr->frame_control) ||
+ ieee80211_is_beacon(hdr->frame_control) ||
+ ieee80211_is_auth(hdr->frame_control))
+ return RX_CONTINUE;
+
+ return RX_DROP_MONITOR;
+ }
+
+ return RX_CONTINUE;
+}
+
+static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
+ int index)
+{
+ struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
+ struct sk_buff *tail = skb_peek_tail(frames);
+ struct ieee80211_rx_status *status;
+
+ if (tid_agg_rx->reorder_buf_filtered &&
+ tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
+ return true;
+
+ if (!tail)
+ return false;
+
+ status = IEEE80211_SKB_RXCB(tail);
+ if (status->flag & RX_FLAG_AMSDU_MORE)
+ return false;
+
+ return true;
+}
+
+static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
+ struct tid_ampdu_rx *tid_agg_rx,
+ int index,
+ struct sk_buff_head *frames)
+{
+ struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
+ struct sk_buff *skb;
+ struct ieee80211_rx_status *status;
+
+ lockdep_assert_held(&tid_agg_rx->reorder_lock);
+
+ if (skb_queue_empty(skb_list))
+ goto no_frame;
+
+ if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
+ __skb_queue_purge(skb_list);
+ goto no_frame;
+ }
+
+ /* release frames from the reorder ring buffer */
+ tid_agg_rx->stored_mpdu_num--;
+ while ((skb = __skb_dequeue(skb_list))) {
+ status = IEEE80211_SKB_RXCB(skb);
+ status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
+ __skb_queue_tail(frames, skb);
+ }
+
+no_frame:
+ if (tid_agg_rx->reorder_buf_filtered)
+ tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
+ tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
+}
+
+static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
+ struct tid_ampdu_rx *tid_agg_rx,
+ u16 head_seq_num,
+ struct sk_buff_head *frames)
+{
+ int index;
+
+ lockdep_assert_held(&tid_agg_rx->reorder_lock);
+
+ while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
+ index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
+ ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
+ frames);
+ }
+}
+
+/*
+ * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
+ * the skb was added to the buffer longer than this time ago, the earlier
+ * frames that have not yet been received are assumed to be lost and the skb
+ * can be released for processing. This may also release other skb's from the
+ * reorder buffer if there are no additional gaps between the frames.
+ *
+ * Callers must hold tid_agg_rx->reorder_lock.
+ */
+#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
+
+static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
+ struct tid_ampdu_rx *tid_agg_rx,
+ struct sk_buff_head *frames)
+{
+ int index, i, j;
+
+ lockdep_assert_held(&tid_agg_rx->reorder_lock);
+
+ /* release the buffer until next missing frame */
+ index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
+ if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
+ tid_agg_rx->stored_mpdu_num) {
+ /*
+ * No buffers ready to be released, but check whether any
+ * frames in the reorder buffer have timed out.
+ */
+ int skipped = 1;
+ for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
+ j = (j + 1) % tid_agg_rx->buf_size) {
+ if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
+ skipped++;
+ continue;
+ }
+ if (skipped &&
+ !time_after(jiffies, tid_agg_rx->reorder_time[j] +
+ HT_RX_REORDER_BUF_TIMEOUT))
+ goto set_release_timer;
+
+ /* don't leave incomplete A-MSDUs around */
+ for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
+ i = (i + 1) % tid_agg_rx->buf_size)
+ __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
+
+ ht_dbg_ratelimited(sdata,
+ "release an RX reorder frame due to timeout on earlier frames\n");
+ ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
+ frames);
+
+ /*
+ * Increment the head seq# also for the skipped slots.
+ */
+ tid_agg_rx->head_seq_num =
+ (tid_agg_rx->head_seq_num +
+ skipped) & IEEE80211_SN_MASK;
+ skipped = 0;
+ }
+ } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
+ ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
+ frames);
+ index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
+ }
+
+ if (tid_agg_rx->stored_mpdu_num) {
+ j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
+
+ for (; j != (index - 1) % tid_agg_rx->buf_size;
+ j = (j + 1) % tid_agg_rx->buf_size) {
+ if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
+ break;
+ }
+
+ set_release_timer:
+
+ if (!tid_agg_rx->removed)
+ mod_timer(&tid_agg_rx->reorder_timer,
+ tid_agg_rx->reorder_time[j] + 1 +
+ HT_RX_REORDER_BUF_TIMEOUT);
+ } else {
+ del_timer(&tid_agg_rx->reorder_timer);
+ }
+}
+
+/*
+ * As this function belongs to the RX path it must be under
+ * rcu_read_lock protection. It returns false if the frame
+ * can be processed immediately, true if it was consumed.
+ */
+static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
+ struct tid_ampdu_rx *tid_agg_rx,
+ struct sk_buff *skb,
+ struct sk_buff_head *frames)
+{
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+ u16 sc = le16_to_cpu(hdr->seq_ctrl);
+ u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
+ u16 head_seq_num, buf_size;
+ int index;
+ bool ret = true;
+
+ spin_lock(&tid_agg_rx->reorder_lock);
+
+ /*
+ * Offloaded BA sessions have no known starting sequence number so pick
+ * one from first Rxed frame for this tid after BA was started.
+ */
+ if (unlikely(tid_agg_rx->auto_seq)) {
+ tid_agg_rx->auto_seq = false;
+ tid_agg_rx->ssn = mpdu_seq_num;
+ tid_agg_rx->head_seq_num = mpdu_seq_num;
+ }
+
+ buf_size = tid_agg_rx->buf_size;
+ head_seq_num = tid_agg_rx->head_seq_num;
+
+ /*
+ * If the current MPDU's SN is smaller than the SSN, it shouldn't
+ * be reordered.
+ */
+ if (unlikely(!tid_agg_rx->started)) {
+ if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
+ ret = false;
+ goto out;
+ }
+ tid_agg_rx->started = true;
+ }
+
+ /* frame with out of date sequence number */
+ if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
+ dev_kfree_skb(skb);
+ goto out;
+ }
+
+ /*
+ * If frame the sequence number exceeds our buffering window
+ * size release some previous frames to make room for this one.
+ */
+ if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
+ head_seq_num = ieee80211_sn_inc(
+ ieee80211_sn_sub(mpdu_seq_num, buf_size));
+ /* release stored frames up to new head to stack */
+ ieee80211_release_reorder_frames(sdata, tid_agg_rx,
+ head_seq_num, frames);
+ }
+
+ /* Now the new frame is always in the range of the reordering buffer */
+
+ index = mpdu_seq_num % tid_agg_rx->buf_size;
+
+ /* check if we already stored this frame */
+ if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
+ dev_kfree_skb(skb);
+ goto out;
+ }
+
+ /*
+ * If the current MPDU is in the right order and nothing else
+ * is stored we can process it directly, no need to buffer it.
+ * If it is first but there's something stored, we may be able
+ * to release frames after this one.
+ */
+ if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
+ tid_agg_rx->stored_mpdu_num == 0) {
+ if (!(status->flag & RX_FLAG_AMSDU_MORE))
+ tid_agg_rx->head_seq_num =
+ ieee80211_sn_inc(tid_agg_rx->head_seq_num);
+ ret = false;
+ goto out;
+ }
+
+ /* put the frame in the reordering buffer */
+ __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
+ if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
+ tid_agg_rx->reorder_time[index] = jiffies;
+ tid_agg_rx->stored_mpdu_num++;
+ ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
+ }
+
+ out:
+ spin_unlock(&tid_agg_rx->reorder_lock);
+ return ret;
+}
+
+/*
+ * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
+ * true if the MPDU was buffered, false if it should be processed.
+ */
+static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
+ struct sk_buff_head *frames)
+{
+ struct sk_buff *skb = rx->skb;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+ struct sta_info *sta = rx->sta;
+ struct tid_ampdu_rx *tid_agg_rx;
+ u16 sc;
+ u8 tid, ack_policy;
+
+ if (!ieee80211_is_data_qos(hdr->frame_control) ||
+ is_multicast_ether_addr(hdr->addr1))
+ goto dont_reorder;
+
+ /*
+ * filter the QoS data rx stream according to
+ * STA/TID and check if this STA/TID is on aggregation
+ */
+
+ if (!sta)
+ goto dont_reorder;
+
+ ack_policy = *ieee80211_get_qos_ctl(hdr) &
+ IEEE80211_QOS_CTL_ACK_POLICY_MASK;
+ tid = ieee80211_get_tid(hdr);
+
+ tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
+ if (!tid_agg_rx) {
+ if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
+ !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
+ !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
+ ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
+ WLAN_BACK_RECIPIENT,
+ WLAN_REASON_QSTA_REQUIRE_SETUP);
+ goto dont_reorder;
+ }
+
+ /* qos null data frames are excluded */
+ if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
+ goto dont_reorder;
+
+ /* not part of a BA session */
+ if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
+ goto dont_reorder;
+
+ /* new, potentially un-ordered, ampdu frame - process it */
+
+ /* reset session timer */
+ if (tid_agg_rx->timeout)
+ tid_agg_rx->last_rx = jiffies;
+
+ /* if this mpdu is fragmented - terminate rx aggregation session */
+ sc = le16_to_cpu(hdr->seq_ctrl);
+ if (sc & IEEE80211_SCTL_FRAG) {
+ ieee80211_queue_skb_to_iface(rx->sdata, rx->link_id, NULL, skb);
+ return;
+ }
+
+ /*
+ * No locking needed -- we will only ever process one
+ * RX packet at a time, and thus own tid_agg_rx. All
+ * other code manipulating it needs to (and does) make
+ * sure that we cannot get to it any more before doing
+ * anything with it.
+ */
+ if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
+ frames))
+ return;
+
+ dont_reorder:
+ __skb_queue_tail(frames, skb);
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+
+ if (status->flag & RX_FLAG_DUP_VALIDATED)
+ return RX_CONTINUE;
+
+ /*
+ * Drop duplicate 802.11 retransmissions
+ * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
+ */
+
+ if (rx->skb->len < 24)
+ return RX_CONTINUE;
+
+ if (ieee80211_is_ctl(hdr->frame_control) ||
+ ieee80211_is_any_nullfunc(hdr->frame_control) ||
+ is_multicast_ether_addr(hdr->addr1))
+ return RX_CONTINUE;
+
+ if (!rx->sta)
+ return RX_CONTINUE;
+
+ if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
+ rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
+ I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
+ rx->link_sta->rx_stats.num_duplicates++;
+ return RX_DROP_UNUSABLE;
+ } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
+ rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
+ }
+
+ return RX_CONTINUE;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+
+ /* Drop disallowed frame classes based on STA auth/assoc state;
+ * IEEE 802.11, Chap 5.5.
+ *
+ * mac80211 filters only based on association state, i.e. it drops
+ * Class 3 frames from not associated stations. hostapd sends
+ * deauth/disassoc frames when needed. In addition, hostapd is
+ * responsible for filtering on both auth and assoc states.
+ */
+
+ if (ieee80211_vif_is_mesh(&rx->sdata->vif))
+ return ieee80211_rx_mesh_check(rx);
+
+ if (unlikely((ieee80211_is_data(hdr->frame_control) ||
+ ieee80211_is_pspoll(hdr->frame_control)) &&
+ rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
+ rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
+ (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
+ /*
+ * accept port control frames from the AP even when it's not
+ * yet marked ASSOC to prevent a race where we don't set the
+ * assoc bit quickly enough before it sends the first frame
+ */
+ if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
+ ieee80211_is_data_present(hdr->frame_control)) {
+ unsigned int hdrlen;
+ __be16 ethertype;
+
+ hdrlen = ieee80211_hdrlen(hdr->frame_control);
+
+ if (rx->skb->len < hdrlen + 8)
+ return RX_DROP_MONITOR;
+
+ skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
+ if (ethertype == rx->sdata->control_port_protocol)
+ return RX_CONTINUE;
+ }
+
+ if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
+ cfg80211_rx_spurious_frame(rx->sdata->dev,
+ hdr->addr2,
+ GFP_ATOMIC))
+ return RX_DROP_UNUSABLE;
+
+ return RX_DROP_MONITOR;
+ }
+
+ return RX_CONTINUE;
+}
+
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_local *local;
+ struct ieee80211_hdr *hdr;
+ struct sk_buff *skb;
+
+ local = rx->local;
+ skb = rx->skb;
+ hdr = (struct ieee80211_hdr *) skb->data;
+
+ if (!local->pspolling)
+ return RX_CONTINUE;
+
+ if (!ieee80211_has_fromds(hdr->frame_control))
+ /* this is not from AP */
+ return RX_CONTINUE;
+
+ if (!ieee80211_is_data(hdr->frame_control))
+ return RX_CONTINUE;
+
+ if (!ieee80211_has_moredata(hdr->frame_control)) {
+ /* AP has no more frames buffered for us */
+ local->pspolling = false;
+ return RX_CONTINUE;
+ }
+
+ /* more data bit is set, let's request a new frame from the AP */
+ ieee80211_send_pspoll(local, rx->sdata);
+
+ return RX_CONTINUE;
+}
+
+static void sta_ps_start(struct sta_info *sta)
+{
+ struct ieee80211_sub_if_data *sdata = sta->sdata;
+ struct ieee80211_local *local = sdata->local;
+ struct ps_data *ps;
+ int tid;
+
+ if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
+ sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+ ps = &sdata->bss->ps;
+ else
+ return;
+
+ atomic_inc(&ps->num_sta_ps);
+ set_sta_flag(sta, WLAN_STA_PS_STA);
+ if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
+ drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
+ ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
+ sta->sta.addr, sta->sta.aid);
+
+ ieee80211_clear_fast_xmit(sta);
+
+ for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
+ struct ieee80211_txq *txq = sta->sta.txq[tid];
+ struct txq_info *txqi = to_txq_info(txq);
+
+ spin_lock(&local->active_txq_lock[txq->ac]);
+ if (!list_empty(&txqi->schedule_order))
+ list_del_init(&txqi->schedule_order);
+ spin_unlock(&local->active_txq_lock[txq->ac]);
+
+ if (txq_has_queue(txq))
+ set_bit(tid, &sta->txq_buffered_tids);
+ else
+ clear_bit(tid, &sta->txq_buffered_tids);
+ }
+}
+
+static void sta_ps_end(struct sta_info *sta)
+{
+ ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
+ sta->sta.addr, sta->sta.aid);
+
+ if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
+ /*
+ * Clear the flag only if the other one is still set
+ * so that the TX path won't start TX'ing new frames
+ * directly ... In the case that the driver flag isn't
+ * set ieee80211_sta_ps_deliver_wakeup() will clear it.
+ */
+ clear_sta_flag(sta, WLAN_STA_PS_STA);
+ ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
+ sta->sta.addr, sta->sta.aid);
+ return;
+ }
+
+ set_sta_flag(sta, WLAN_STA_PS_DELIVER);
+ clear_sta_flag(sta, WLAN_STA_PS_STA);
+ ieee80211_sta_ps_deliver_wakeup(sta);
+}
+
+int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
+{
+ struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+ bool in_ps;
+
+ WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
+
+ /* Don't let the same PS state be set twice */
+ in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
+ if ((start && in_ps) || (!start && !in_ps))
+ return -EINVAL;
+
+ if (start)
+ sta_ps_start(sta);
+ else
+ sta_ps_end(sta);
+
+ return 0;
+}
+EXPORT_SYMBOL(ieee80211_sta_ps_transition);
+
+void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
+{
+ struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+
+ if (test_sta_flag(sta, WLAN_STA_SP))
+ return;
+
+ if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
+ ieee80211_sta_ps_deliver_poll_response(sta);
+ else
+ set_sta_flag(sta, WLAN_STA_PSPOLL);
+}
+EXPORT_SYMBOL(ieee80211_sta_pspoll);
+
+void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
+{
+ struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+ int ac = ieee80211_ac_from_tid(tid);
+
+ /*
+ * If this AC is not trigger-enabled do nothing unless the
+ * driver is calling us after it already checked.
+ *
+ * NB: This could/should check a separate bitmap of trigger-
+ * enabled queues, but for now we only implement uAPSD w/o
+ * TSPEC changes to the ACs, so they're always the same.
+ */
+ if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
+ tid != IEEE80211_NUM_TIDS)
+ return;
+
+ /* if we are in a service period, do nothing */
+ if (test_sta_flag(sta, WLAN_STA_SP))
+ return;
+
+ if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
+ ieee80211_sta_ps_deliver_uapsd(sta);
+ else
+ set_sta_flag(sta, WLAN_STA_UAPSD);
+}
+EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_sub_if_data *sdata = rx->sdata;
+ struct ieee80211_hdr *hdr = (void *)rx->skb->data;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+
+ if (!rx->sta)
+ return RX_CONTINUE;
+
+ if (sdata->vif.type != NL80211_IFTYPE_AP &&
+ sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
+ return RX_CONTINUE;
+
+ /*
+ * The device handles station powersave, so don't do anything about
+ * uAPSD and PS-Poll frames (the latter shouldn't even come up from
+ * it to mac80211 since they're handled.)
+ */
+ if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
+ return RX_CONTINUE;
+
+ /*
+ * Don't do anything if the station isn't already asleep. In
+ * the uAPSD case, the station will probably be marked asleep,
+ * in the PS-Poll case the station must be confused ...
+ */
+ if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
+ return RX_CONTINUE;
+
+ if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
+ ieee80211_sta_pspoll(&rx->sta->sta);
+
+ /* Free PS Poll skb here instead of returning RX_DROP that would
+ * count as an dropped frame. */
+ dev_kfree_skb(rx->skb);
+
+ return RX_QUEUED;
+ } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
+ !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
+ ieee80211_has_pm(hdr->frame_control) &&
+ (ieee80211_is_data_qos(hdr->frame_control) ||
+ ieee80211_is_qos_nullfunc(hdr->frame_control))) {
+ u8 tid = ieee80211_get_tid(hdr);
+
+ ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
+ }
+
+ return RX_CONTINUE;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
+{
+ struct sta_info *sta = rx->sta;
+ struct link_sta_info *link_sta = rx->link_sta;
+ struct sk_buff *skb = rx->skb;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ int i;
+
+ if (!sta || !link_sta)
+ return RX_CONTINUE;
+
+ /*
+ * Update last_rx only for IBSS packets which are for the current
+ * BSSID and for station already AUTHORIZED to avoid keeping the
+ * current IBSS network alive in cases where other STAs start
+ * using different BSSID. This will also give the station another
+ * chance to restart the authentication/authorization in case
+ * something went wrong the first time.
+ */
+ if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
+ u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
+ NL80211_IFTYPE_ADHOC);
+ if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
+ test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
+ link_sta->rx_stats.last_rx = jiffies;
+ if (ieee80211_is_data_present(hdr->frame_control) &&
+ !is_multicast_ether_addr(hdr->addr1))
+ link_sta->rx_stats.last_rate =
+ sta_stats_encode_rate(status);
+ }
+ } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
+ link_sta->rx_stats.last_rx = jiffies;
+ } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) &&
+ !is_multicast_ether_addr(hdr->addr1)) {
+ /*
+ * Mesh beacons will update last_rx when if they are found to
+ * match the current local configuration when processed.
+ */
+ link_sta->rx_stats.last_rx = jiffies;
+ if (ieee80211_is_data_present(hdr->frame_control))
+ link_sta->rx_stats.last_rate = sta_stats_encode_rate(status);
+ }
+
+ link_sta->rx_stats.fragments++;
+
+ u64_stats_update_begin(&link_sta->rx_stats.syncp);
+ link_sta->rx_stats.bytes += rx->skb->len;
+ u64_stats_update_end(&link_sta->rx_stats.syncp);
+
+ if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
+ link_sta->rx_stats.last_signal = status->signal;
+ ewma_signal_add(&link_sta->rx_stats_avg.signal,
+ -status->signal);
+ }
+
+ if (status->chains) {
+ link_sta->rx_stats.chains = status->chains;
+ for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
+ int signal = status->chain_signal[i];
+
+ if (!(status->chains & BIT(i)))
+ continue;
+
+ link_sta->rx_stats.chain_signal_last[i] = signal;
+ ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i],
+ -signal);
+ }
+ }
+
+ if (ieee80211_is_s1g_beacon(hdr->frame_control))
+ return RX_CONTINUE;
+
+ /*
+ * Change STA power saving mode only at the end of a frame
+ * exchange sequence, and only for a data or management
+ * frame as specified in IEEE 802.11-2016 11.2.3.2
+ */
+ if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
+ !ieee80211_has_morefrags(hdr->frame_control) &&
+ !is_multicast_ether_addr(hdr->addr1) &&
+ (ieee80211_is_mgmt(hdr->frame_control) ||
+ ieee80211_is_data(hdr->frame_control)) &&
+ !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
+ (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
+ rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
+ if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
+ if (!ieee80211_has_pm(hdr->frame_control))
+ sta_ps_end(sta);
+ } else {
+ if (ieee80211_has_pm(hdr->frame_control))
+ sta_ps_start(sta);
+ }
+ }
+
+ /* mesh power save support */
+ if (ieee80211_vif_is_mesh(&rx->sdata->vif))
+ ieee80211_mps_rx_h_sta_process(sta, hdr);
+
+ /*
+ * Drop (qos-)data::nullfunc frames silently, since they
+ * are used only to control station power saving mode.
+ */
+ if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
+ I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
+
+ /*
+ * If we receive a 4-addr nullfunc frame from a STA
+ * that was not moved to a 4-addr STA vlan yet send
+ * the event to userspace and for older hostapd drop
+ * the frame to the monitor interface.
+ */
+ if (ieee80211_has_a4(hdr->frame_control) &&
+ (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
+ (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
+ !rx->sdata->u.vlan.sta))) {
+ if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
+ cfg80211_rx_unexpected_4addr_frame(
+ rx->sdata->dev, sta->sta.addr,
+ GFP_ATOMIC);
+ return RX_DROP_M_UNEXPECTED_4ADDR_FRAME;
+ }
+ /*
+ * Update counter and free packet here to avoid
+ * counting this as a dropped packed.
+ */
+ link_sta->rx_stats.packets++;
+ dev_kfree_skb(rx->skb);
+ return RX_QUEUED;
+ }
+
+ return RX_CONTINUE;
+} /* ieee80211_rx_h_sta_process */
+
+static struct ieee80211_key *
+ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx)
+{
+ struct ieee80211_key *key = NULL;
+ int idx2;
+
+ /* Make sure key gets set if either BIGTK key index is set so that
+ * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected
+ * Beacon frames and Beacon frames that claim to use another BIGTK key
+ * index (i.e., a key that we do not have).
+ */
+
+ if (idx < 0) {
+ idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
+ idx2 = idx + 1;
+ } else {
+ if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
+ idx2 = idx + 1;
+ else
+ idx2 = idx - 1;
+ }
+
+ if (rx->link_sta)
+ key = rcu_dereference(rx->link_sta->gtk[idx]);
+ if (!key)
+ key = rcu_dereference(rx->link->gtk[idx]);
+ if (!key && rx->link_sta)
+ key = rcu_dereference(rx->link_sta->gtk[idx2]);
+ if (!key)
+ key = rcu_dereference(rx->link->gtk[idx2]);
+
+ return key;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
+{
+ struct sk_buff *skb = rx->skb;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ int keyidx;
+ ieee80211_rx_result result = RX_DROP_UNUSABLE;
+ struct ieee80211_key *sta_ptk = NULL;
+ struct ieee80211_key *ptk_idx = NULL;
+ int mmie_keyidx = -1;
+ __le16 fc;
+
+ if (ieee80211_is_ext(hdr->frame_control))
+ return RX_CONTINUE;
+
+ /*
+ * Key selection 101
+ *
+ * There are five types of keys:
+ * - GTK (group keys)
+ * - IGTK (group keys for management frames)
+ * - BIGTK (group keys for Beacon frames)
+ * - PTK (pairwise keys)
+ * - STK (station-to-station pairwise keys)
+ *
+ * When selecting a key, we have to distinguish between multicast
+ * (including broadcast) and unicast frames, the latter can only
+ * use PTKs and STKs while the former always use GTKs, IGTKs, and
+ * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used,
+ * then unicast frames can also use key indices like GTKs. Hence, if we
+ * don't have a PTK/STK we check the key index for a WEP key.
+ *
+ * Note that in a regular BSS, multicast frames are sent by the
+ * AP only, associated stations unicast the frame to the AP first
+ * which then multicasts it on their behalf.
+ *
+ * There is also a slight problem in IBSS mode: GTKs are negotiated
+ * with each station, that is something we don't currently handle.
+ * The spec seems to expect that one negotiates the same key with
+ * every station but there's no such requirement; VLANs could be
+ * possible.
+ */
+
+ /* start without a key */
+ rx->key = NULL;
+ fc = hdr->frame_control;
+
+ if (rx->sta) {
+ int keyid = rx->sta->ptk_idx;
+ sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
+
+ if (ieee80211_has_protected(fc) &&
+ !(status->flag & RX_FLAG_IV_STRIPPED)) {
+ keyid = ieee80211_get_keyid(rx->skb);
+
+ if (unlikely(keyid < 0))
+ return RX_DROP_UNUSABLE;
+
+ ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
+ }
+ }
+
+ if (!ieee80211_has_protected(fc))
+ mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
+
+ if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
+ rx->key = ptk_idx ? ptk_idx : sta_ptk;
+ if ((status->flag & RX_FLAG_DECRYPTED) &&
+ (status->flag & RX_FLAG_IV_STRIPPED))
+ return RX_CONTINUE;
+ /* Skip decryption if the frame is not protected. */
+ if (!ieee80211_has_protected(fc))
+ return RX_CONTINUE;
+ } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) {
+ /* Broadcast/multicast robust management frame / BIP */
+ if ((status->flag & RX_FLAG_DECRYPTED) &&
+ (status->flag & RX_FLAG_IV_STRIPPED))
+ return RX_CONTINUE;
+
+ if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
+ mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
+ NUM_DEFAULT_BEACON_KEYS) {
+ if (rx->sdata->dev)
+ cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
+ skb->data,
+ skb->len);
+ return RX_DROP_M_BAD_BCN_KEYIDX;
+ }
+
+ rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx);
+ if (!rx->key)
+ return RX_CONTINUE; /* Beacon protection not in use */
+ } else if (mmie_keyidx >= 0) {
+ /* Broadcast/multicast robust management frame / BIP */
+ if ((status->flag & RX_FLAG_DECRYPTED) &&
+ (status->flag & RX_FLAG_IV_STRIPPED))
+ return RX_CONTINUE;
+
+ if (mmie_keyidx < NUM_DEFAULT_KEYS ||
+ mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
+ return RX_DROP_M_BAD_MGMT_KEYIDX; /* unexpected BIP keyidx */
+ if (rx->link_sta) {
+ if (ieee80211_is_group_privacy_action(skb) &&
+ test_sta_flag(rx->sta, WLAN_STA_MFP))
+ return RX_DROP_MONITOR;
+
+ rx->key = rcu_dereference(rx->link_sta->gtk[mmie_keyidx]);
+ }
+ if (!rx->key)
+ rx->key = rcu_dereference(rx->link->gtk[mmie_keyidx]);
+ } else if (!ieee80211_has_protected(fc)) {
+ /*
+ * The frame was not protected, so skip decryption. However, we
+ * need to set rx->key if there is a key that could have been
+ * used so that the frame may be dropped if encryption would
+ * have been expected.
+ */
+ struct ieee80211_key *key = NULL;
+ int i;
+
+ if (ieee80211_is_beacon(fc)) {
+ key = ieee80211_rx_get_bigtk(rx, -1);
+ } else if (ieee80211_is_mgmt(fc) &&
+ is_multicast_ether_addr(hdr->addr1)) {
+ key = rcu_dereference(rx->link->default_mgmt_key);
+ } else {
+ if (rx->link_sta) {
+ for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
+ key = rcu_dereference(rx->link_sta->gtk[i]);
+ if (key)
+ break;
+ }
+ }
+ if (!key) {
+ for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
+ key = rcu_dereference(rx->link->gtk[i]);
+ if (key)
+ break;
+ }
+ }
+ }
+ if (key)
+ rx->key = key;
+ return RX_CONTINUE;
+ } else {
+ /*
+ * The device doesn't give us the IV so we won't be
+ * able to look up the key. That's ok though, we
+ * don't need to decrypt the frame, we just won't
+ * be able to keep statistics accurate.
+ * Except for key threshold notifications, should
+ * we somehow allow the driver to tell us which key
+ * the hardware used if this flag is set?
+ */
+ if ((status->flag & RX_FLAG_DECRYPTED) &&
+ (status->flag & RX_FLAG_IV_STRIPPED))
+ return RX_CONTINUE;
+
+ keyidx = ieee80211_get_keyid(rx->skb);
+
+ if (unlikely(keyidx < 0))
+ return RX_DROP_UNUSABLE;
+
+ /* check per-station GTK first, if multicast packet */
+ if (is_multicast_ether_addr(hdr->addr1) && rx->link_sta)
+ rx->key = rcu_dereference(rx->link_sta->gtk[keyidx]);
+
+ /* if not found, try default key */
+ if (!rx->key) {
+ if (is_multicast_ether_addr(hdr->addr1))
+ rx->key = rcu_dereference(rx->link->gtk[keyidx]);
+ if (!rx->key)
+ rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
+
+ /*
+ * RSNA-protected unicast frames should always be
+ * sent with pairwise or station-to-station keys,
+ * but for WEP we allow using a key index as well.
+ */
+ if (rx->key &&
+ rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
+ rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
+ !is_multicast_ether_addr(hdr->addr1))
+ rx->key = NULL;
+ }
+ }
+
+ if (rx->key) {
+ if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
+ return RX_DROP_MONITOR;
+
+ /* TODO: add threshold stuff again */
+ } else {
+ return RX_DROP_MONITOR;
+ }
+
+ switch (rx->key->conf.cipher) {
+ case WLAN_CIPHER_SUITE_WEP40:
+ case WLAN_CIPHER_SUITE_WEP104:
+ result = ieee80211_crypto_wep_decrypt(rx);
+ break;
+ case WLAN_CIPHER_SUITE_TKIP:
+ result = ieee80211_crypto_tkip_decrypt(rx);
+ break;
+ case WLAN_CIPHER_SUITE_CCMP:
+ result = ieee80211_crypto_ccmp_decrypt(
+ rx, IEEE80211_CCMP_MIC_LEN);
+ break;
+ case WLAN_CIPHER_SUITE_CCMP_256:
+ result = ieee80211_crypto_ccmp_decrypt(
+ rx, IEEE80211_CCMP_256_MIC_LEN);
+ break;
+ case WLAN_CIPHER_SUITE_AES_CMAC:
+ result = ieee80211_crypto_aes_cmac_decrypt(rx);
+ break;
+ case WLAN_CIPHER_SUITE_BIP_CMAC_256:
+ result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
+ break;
+ case WLAN_CIPHER_SUITE_BIP_GMAC_128:
+ case WLAN_CIPHER_SUITE_BIP_GMAC_256:
+ result = ieee80211_crypto_aes_gmac_decrypt(rx);
+ break;
+ case WLAN_CIPHER_SUITE_GCMP:
+ case WLAN_CIPHER_SUITE_GCMP_256:
+ result = ieee80211_crypto_gcmp_decrypt(rx);
+ break;
+ default:
+ result = RX_DROP_UNUSABLE;
+ }
+
+ /* the hdr variable is invalid after the decrypt handlers */
+
+ /* either the frame has been decrypted or will be dropped */
+ status->flag |= RX_FLAG_DECRYPTED;
+
+ if (unlikely(ieee80211_is_beacon(fc) && RX_RES_IS_UNUSABLE(result) &&
+ rx->sdata->dev))
+ cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
+ skb->data, skb->len);
+
+ return result;
+}
+
+void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
+ skb_queue_head_init(&cache->entries[i].skb_list);
+}
+
+void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
+ __skb_queue_purge(&cache->entries[i].skb_list);
+}
+
+static inline struct ieee80211_fragment_entry *
+ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache,
+ unsigned int frag, unsigned int seq, int rx_queue,
+ struct sk_buff **skb)
+{
+ struct ieee80211_fragment_entry *entry;
+
+ entry = &cache->entries[cache->next++];
+ if (cache->next >= IEEE80211_FRAGMENT_MAX)
+ cache->next = 0;
+
+ __skb_queue_purge(&entry->skb_list);
+
+ __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
+ *skb = NULL;
+ entry->first_frag_time = jiffies;
+ entry->seq = seq;
+ entry->rx_queue = rx_queue;
+ entry->last_frag = frag;
+ entry->check_sequential_pn = false;
+ entry->extra_len = 0;
+
+ return entry;
+}
+
+static inline struct ieee80211_fragment_entry *
+ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache,
+ unsigned int frag, unsigned int seq,
+ int rx_queue, struct ieee80211_hdr *hdr)
+{
+ struct ieee80211_fragment_entry *entry;
+ int i, idx;
+
+ idx = cache->next;
+ for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
+ struct ieee80211_hdr *f_hdr;
+ struct sk_buff *f_skb;
+
+ idx--;
+ if (idx < 0)
+ idx = IEEE80211_FRAGMENT_MAX - 1;
+
+ entry = &cache->entries[idx];
+ if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
+ entry->rx_queue != rx_queue ||
+ entry->last_frag + 1 != frag)
+ continue;
+
+ f_skb = __skb_peek(&entry->skb_list);
+ f_hdr = (struct ieee80211_hdr *) f_skb->data;
+
+ /*
+ * Check ftype and addresses are equal, else check next fragment
+ */
+ if (((hdr->frame_control ^ f_hdr->frame_control) &
+ cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
+ !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
+ !ether_addr_equal(hdr->addr2, f_hdr->addr2))
+ continue;
+
+ if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
+ __skb_queue_purge(&entry->skb_list);
+ continue;
+ }
+ return entry;
+ }
+
+ return NULL;
+}
+
+static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc)
+{
+ return rx->key &&
+ (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
+ rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
+ rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
+ rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
+ ieee80211_has_protected(fc);
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_fragment_cache *cache = &rx->sdata->frags;
+ struct ieee80211_hdr *hdr;
+ u16 sc;
+ __le16 fc;
+ unsigned int frag, seq;
+ struct ieee80211_fragment_entry *entry;
+ struct sk_buff *skb;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+
+ hdr = (struct ieee80211_hdr *)rx->skb->data;
+ fc = hdr->frame_control;
+
+ if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc))
+ return RX_CONTINUE;
+
+ sc = le16_to_cpu(hdr->seq_ctrl);
+ frag = sc & IEEE80211_SCTL_FRAG;
+
+ if (rx->sta)
+ cache = &rx->sta->frags;
+
+ if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
+ goto out;
+
+ if (is_multicast_ether_addr(hdr->addr1))
+ return RX_DROP_MONITOR;
+
+ I802_DEBUG_INC(rx->local->rx_handlers_fragments);
+
+ if (skb_linearize(rx->skb))
+ return RX_DROP_UNUSABLE;
+
+ /*
+ * skb_linearize() might change the skb->data and
+ * previously cached variables (in this case, hdr) need to
+ * be refreshed with the new data.
+ */
+ hdr = (struct ieee80211_hdr *)rx->skb->data;
+ seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
+
+ if (frag == 0) {
+ /* This is the first fragment of a new frame. */
+ entry = ieee80211_reassemble_add(cache, frag, seq,
+ rx->seqno_idx, &(rx->skb));
+ if (requires_sequential_pn(rx, fc)) {
+ int queue = rx->security_idx;
+
+ /* Store CCMP/GCMP PN so that we can verify that the
+ * next fragment has a sequential PN value.
+ */
+ entry->check_sequential_pn = true;
+ entry->is_protected = true;
+ entry->key_color = rx->key->color;
+ memcpy(entry->last_pn,
+ rx->key->u.ccmp.rx_pn[queue],
+ IEEE80211_CCMP_PN_LEN);
+ BUILD_BUG_ON(offsetof(struct ieee80211_key,
+ u.ccmp.rx_pn) !=
+ offsetof(struct ieee80211_key,
+ u.gcmp.rx_pn));
+ BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
+ sizeof(rx->key->u.gcmp.rx_pn[queue]));
+ BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
+ IEEE80211_GCMP_PN_LEN);
+ } else if (rx->key &&
+ (ieee80211_has_protected(fc) ||
+ (status->flag & RX_FLAG_DECRYPTED))) {
+ entry->is_protected = true;
+ entry->key_color = rx->key->color;
+ }
+ return RX_QUEUED;
+ }
+
+ /* This is a fragment for a frame that should already be pending in
+ * fragment cache. Add this fragment to the end of the pending entry.
+ */
+ entry = ieee80211_reassemble_find(cache, frag, seq,
+ rx->seqno_idx, hdr);
+ if (!entry) {
+ I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
+ return RX_DROP_MONITOR;
+ }
+
+ /* "The receiver shall discard MSDUs and MMPDUs whose constituent
+ * MPDU PN values are not incrementing in steps of 1."
+ * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
+ * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
+ */
+ if (entry->check_sequential_pn) {
+ int i;
+ u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
+
+ if (!requires_sequential_pn(rx, fc))
+ return RX_DROP_UNUSABLE;
+
+ /* Prevent mixed key and fragment cache attacks */
+ if (entry->key_color != rx->key->color)
+ return RX_DROP_UNUSABLE;
+
+ memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
+ for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
+ pn[i]++;
+ if (pn[i])
+ break;
+ }
+
+ rpn = rx->ccm_gcm.pn;
+ if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
+ return RX_DROP_UNUSABLE;
+ memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
+ } else if (entry->is_protected &&
+ (!rx->key ||
+ (!ieee80211_has_protected(fc) &&
+ !(status->flag & RX_FLAG_DECRYPTED)) ||
+ rx->key->color != entry->key_color)) {
+ /* Drop this as a mixed key or fragment cache attack, even
+ * if for TKIP Michael MIC should protect us, and WEP is a
+ * lost cause anyway.
+ */
+ return RX_DROP_UNUSABLE;
+ } else if (entry->is_protected && rx->key &&
+ entry->key_color != rx->key->color &&
+ (status->flag & RX_FLAG_DECRYPTED)) {
+ return RX_DROP_UNUSABLE;
+ }
+
+ skb_pull(rx->skb, ieee80211_hdrlen(fc));
+ __skb_queue_tail(&entry->skb_list, rx->skb);
+ entry->last_frag = frag;
+ entry->extra_len += rx->skb->len;
+ if (ieee80211_has_morefrags(fc)) {
+ rx->skb = NULL;
+ return RX_QUEUED;
+ }
+
+ rx->skb = __skb_dequeue(&entry->skb_list);
+ if (skb_tailroom(rx->skb) < entry->extra_len) {
+ I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
+ if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
+ GFP_ATOMIC))) {
+ I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
+ __skb_queue_purge(&entry->skb_list);
+ return RX_DROP_UNUSABLE;
+ }
+ }
+ while ((skb = __skb_dequeue(&entry->skb_list))) {
+ skb_put_data(rx->skb, skb->data, skb->len);
+ dev_kfree_skb(skb);
+ }
+
+ out:
+ ieee80211_led_rx(rx->local);
+ if (rx->sta)
+ rx->link_sta->rx_stats.packets++;
+ return RX_CONTINUE;
+}
+
+static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
+{
+ if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
+ return -EACCES;
+
+ return 0;
+}
+
+static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
+{
+ struct sk_buff *skb = rx->skb;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+
+ /*
+ * Pass through unencrypted frames if the hardware has
+ * decrypted them already.
+ */
+ if (status->flag & RX_FLAG_DECRYPTED)
+ return 0;
+
+ /* Drop unencrypted frames if key is set. */
+ if (unlikely(!ieee80211_has_protected(fc) &&
+ !ieee80211_is_any_nullfunc(fc) &&
+ ieee80211_is_data(fc) && rx->key))
+ return -EACCES;
+
+ return 0;
+}
+
+static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+ struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
+ __le16 fc = mgmt->frame_control;
+
+ /*
+ * Pass through unencrypted frames if the hardware has
+ * decrypted them already.
+ */
+ if (status->flag & RX_FLAG_DECRYPTED)
+ return 0;
+
+ /* drop unicast protected dual (that wasn't protected) */
+ if (ieee80211_is_action(fc) &&
+ mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION)
+ return -EACCES;
+
+ if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
+ if (unlikely(!ieee80211_has_protected(fc) &&
+ ieee80211_is_unicast_robust_mgmt_frame(rx->skb))) {
+ if (ieee80211_is_deauth(fc) ||
+ ieee80211_is_disassoc(fc)) {
+ /*
+ * Permit unprotected deauth/disassoc frames
+ * during 4-way-HS (key is installed after HS).
+ */
+ if (!rx->key)
+ return 0;
+
+ cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
+ rx->skb->data,
+ rx->skb->len);
+ }
+ return -EACCES;
+ }
+ /* BIP does not use Protected field, so need to check MMIE */
+ if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
+ ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
+ if (ieee80211_is_deauth(fc) ||
+ ieee80211_is_disassoc(fc))
+ cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
+ rx->skb->data,
+ rx->skb->len);
+ return -EACCES;
+ }
+ if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
+ ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
+ cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
+ rx->skb->data,
+ rx->skb->len);
+ return -EACCES;
+ }
+ /*
+ * When using MFP, Action frames are not allowed prior to
+ * having configured keys.
+ */
+ if (unlikely(ieee80211_is_action(fc) && !rx->key &&
+ ieee80211_is_robust_mgmt_frame(rx->skb)))
+ return -EACCES;
+
+ /* drop unicast public action frames when using MPF */
+ if (is_unicast_ether_addr(mgmt->da) &&
+ ieee80211_is_protected_dual_of_public_action(rx->skb))
+ return -EACCES;
+ }
+
+ return 0;
+}
+
+static int
+__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
+{
+ struct ieee80211_sub_if_data *sdata = rx->sdata;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+ bool check_port_control = false;
+ struct ethhdr *ehdr;
+ int ret;
+
+ *port_control = false;
+ if (ieee80211_has_a4(hdr->frame_control) &&
+ sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
+ return -1;
+
+ if (sdata->vif.type == NL80211_IFTYPE_STATION &&
+ !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
+
+ if (!sdata->u.mgd.use_4addr)
+ return -1;
+ else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
+ check_port_control = true;
+ }
+
+ if (is_multicast_ether_addr(hdr->addr1) &&
+ sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
+ return -1;
+
+ ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
+ if (ret < 0)
+ return ret;
+
+ ehdr = (struct ethhdr *) rx->skb->data;
+ if (ehdr->h_proto == rx->sdata->control_port_protocol)
+ *port_control = true;
+ else if (check_port_control)
+ return -1;
+
+ return 0;
+}
+
+bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata,
+ const u8 *addr, int *out_link_id)
+{
+ unsigned int link_id;
+
+ /* non-MLO, or MLD address replaced by hardware */
+ if (ether_addr_equal(sdata->vif.addr, addr))
+ return true;
+
+ if (!ieee80211_vif_is_mld(&sdata->vif))
+ return false;
+
+ for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) {
+ struct ieee80211_bss_conf *conf;
+
+ conf = rcu_dereference(sdata->vif.link_conf[link_id]);
+
+ if (!conf)
+ continue;
+ if (ether_addr_equal(conf->addr, addr)) {
+ if (out_link_id)
+ *out_link_id = link_id;
+ return true;
+ }
+ }
+
+ return false;
+}
+
+/*
+ * requires that rx->skb is a frame with ethernet header
+ */
+static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
+{
+ static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
+ = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
+ struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
+
+ /*
+ * Allow EAPOL frames to us/the PAE group address regardless of
+ * whether the frame was encrypted or not, and always disallow
+ * all other destination addresses for them.
+ */
+ if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol))
+ return ieee80211_is_our_addr(rx->sdata, ehdr->h_dest, NULL) ||
+ ether_addr_equal(ehdr->h_dest, pae_group_addr);
+
+ if (ieee80211_802_1x_port_control(rx) ||
+ ieee80211_drop_unencrypted(rx, fc))
+ return false;
+
+ return true;
+}
+
+static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
+ struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_sub_if_data *sdata = rx->sdata;
+ struct net_device *dev = sdata->dev;
+
+ if (unlikely((skb->protocol == sdata->control_port_protocol ||
+ (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) &&
+ !sdata->control_port_no_preauth)) &&
+ sdata->control_port_over_nl80211)) {
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+ bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
+
+ cfg80211_rx_control_port(dev, skb, noencrypt, rx->link_id);
+ dev_kfree_skb(skb);
+ } else {
+ struct ethhdr *ehdr = (void *)skb_mac_header(skb);
+
+ memset(skb->cb, 0, sizeof(skb->cb));
+
+ /*
+ * 802.1X over 802.11 requires that the authenticator address
+ * be used for EAPOL frames. However, 802.1X allows the use of
+ * the PAE group address instead. If the interface is part of
+ * a bridge and we pass the frame with the PAE group address,
+ * then the bridge will forward it to the network (even if the
+ * client was not associated yet), which isn't supposed to
+ * happen.
+ * To avoid that, rewrite the destination address to our own
+ * address, so that the authenticator (e.g. hostapd) will see
+ * the frame, but bridge won't forward it anywhere else. Note
+ * that due to earlier filtering, the only other address can
+ * be the PAE group address, unless the hardware allowed them
+ * through in 802.3 offloaded mode.
+ */
+ if (unlikely(skb->protocol == sdata->control_port_protocol &&
+ !ether_addr_equal(ehdr->h_dest, sdata->vif.addr)))
+ ether_addr_copy(ehdr->h_dest, sdata->vif.addr);
+
+ /* deliver to local stack */
+ if (rx->list)
+ list_add_tail(&skb->list, rx->list);
+ else
+ netif_receive_skb(skb);
+ }
+}
+
+/*
+ * requires that rx->skb is a frame with ethernet header
+ */
+static void
+ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_sub_if_data *sdata = rx->sdata;
+ struct net_device *dev = sdata->dev;
+ struct sk_buff *skb, *xmit_skb;
+ struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
+ struct sta_info *dsta;
+
+ skb = rx->skb;
+ xmit_skb = NULL;
+
+ dev_sw_netstats_rx_add(dev, skb->len);
+
+ if (rx->sta) {
+ /* The seqno index has the same property as needed
+ * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
+ * for non-QoS-data frames. Here we know it's a data
+ * frame, so count MSDUs.
+ */
+ u64_stats_update_begin(&rx->link_sta->rx_stats.syncp);
+ rx->link_sta->rx_stats.msdu[rx->seqno_idx]++;
+ u64_stats_update_end(&rx->link_sta->rx_stats.syncp);
+ }
+
+ if ((sdata->vif.type == NL80211_IFTYPE_AP ||
+ sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
+ !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
+ ehdr->h_proto != rx->sdata->control_port_protocol &&
+ (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
+ if (is_multicast_ether_addr(ehdr->h_dest) &&
+ ieee80211_vif_get_num_mcast_if(sdata) != 0) {
+ /*
+ * send multicast frames both to higher layers in
+ * local net stack and back to the wireless medium
+ */
+ xmit_skb = skb_copy(skb, GFP_ATOMIC);
+ if (!xmit_skb)
+ net_info_ratelimited("%s: failed to clone multicast frame\n",
+ dev->name);
+ } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
+ !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
+ dsta = sta_info_get(sdata, ehdr->h_dest);
+ if (dsta) {
+ /*
+ * The destination station is associated to
+ * this AP (in this VLAN), so send the frame
+ * directly to it and do not pass it to local
+ * net stack.
+ */
+ xmit_skb = skb;
+ skb = NULL;
+ }
+ }
+ }
+
+#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
+ if (skb) {
+ /* 'align' will only take the values 0 or 2 here since all
+ * frames are required to be aligned to 2-byte boundaries
+ * when being passed to mac80211; the code here works just
+ * as well if that isn't true, but mac80211 assumes it can
+ * access fields as 2-byte aligned (e.g. for ether_addr_equal)
+ */
+ int align;
+
+ align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
+ if (align) {
+ if (WARN_ON(skb_headroom(skb) < 3)) {
+ dev_kfree_skb(skb);
+ skb = NULL;
+ } else {
+ u8 *data = skb->data;
+ size_t len = skb_headlen(skb);
+ skb->data -= align;
+ memmove(skb->data, data, len);
+ skb_set_tail_pointer(skb, len);
+ }
+ }
+ }
+#endif
+
+ if (skb) {
+ skb->protocol = eth_type_trans(skb, dev);
+ ieee80211_deliver_skb_to_local_stack(skb, rx);
+ }
+
+ if (xmit_skb) {
+ /*
+ * Send to wireless media and increase priority by 256 to
+ * keep the received priority instead of reclassifying
+ * the frame (see cfg80211_classify8021d).
+ */
+ xmit_skb->priority += 256;
+ xmit_skb->protocol = htons(ETH_P_802_3);
+ skb_reset_network_header(xmit_skb);
+ skb_reset_mac_header(xmit_skb);
+ dev_queue_xmit(xmit_skb);
+ }
+}
+
+#ifdef CONFIG_MAC80211_MESH
+static bool
+ieee80211_rx_mesh_fast_forward(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb, int hdrlen)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ struct ieee80211_mesh_fast_tx *entry = NULL;
+ struct ieee80211s_hdr *mesh_hdr;
+ struct tid_ampdu_tx *tid_tx;
+ struct sta_info *sta;
+ struct ethhdr eth;
+ u8 tid;
+
+ mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(eth));
+ if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6)
+ entry = mesh_fast_tx_get(sdata, mesh_hdr->eaddr1);
+ else if (!(mesh_hdr->flags & MESH_FLAGS_AE))
+ entry = mesh_fast_tx_get(sdata, skb->data);
+ if (!entry)
+ return false;
+
+ sta = rcu_dereference(entry->mpath->next_hop);
+ if (!sta)
+ return false;
+
+ if (skb_linearize(skb))
+ return false;
+
+ tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
+ tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
+ if (tid_tx) {
+ if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
+ return false;
+
+ if (tid_tx->timeout)
+ tid_tx->last_tx = jiffies;
+ }
+
+ ieee80211_aggr_check(sdata, sta, skb);
+
+ if (ieee80211_get_8023_tunnel_proto(skb->data + hdrlen,
+ &skb->protocol))
+ hdrlen += ETH_ALEN;
+ else
+ skb->protocol = htons(skb->len - hdrlen);
+ skb_set_network_header(skb, hdrlen + 2);
+
+ skb->dev = sdata->dev;
+ memcpy(&eth, skb->data, ETH_HLEN - 2);
+ skb_pull(skb, 2);
+ __ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx,
+ eth.h_dest, eth.h_source);
+ IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
+ IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
+
+ return true;
+}
+#endif
+
+static ieee80211_rx_result
+ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta,
+ struct sk_buff *skb)
+{
+#ifdef CONFIG_MAC80211_MESH
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ struct ieee80211_local *local = sdata->local;
+ uint16_t fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA;
+ struct ieee80211_hdr hdr = {
+ .frame_control = cpu_to_le16(fc)
+ };
+ struct ieee80211_hdr *fwd_hdr;
+ struct ieee80211s_hdr *mesh_hdr;
+ struct ieee80211_tx_info *info;
+ struct sk_buff *fwd_skb;
+ struct ethhdr *eth;
+ bool multicast;
+ int tailroom = 0;
+ int hdrlen, mesh_hdrlen;
+ u8 *qos;
+
+ if (!ieee80211_vif_is_mesh(&sdata->vif))
+ return RX_CONTINUE;
+
+ if (!pskb_may_pull(skb, sizeof(*eth) + 6))
+ return RX_DROP_MONITOR;
+
+ mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(*eth));
+ mesh_hdrlen = ieee80211_get_mesh_hdrlen(mesh_hdr);
+
+ if (!pskb_may_pull(skb, sizeof(*eth) + mesh_hdrlen))
+ return RX_DROP_MONITOR;
+
+ eth = (struct ethhdr *)skb->data;
+ multicast = is_multicast_ether_addr(eth->h_dest);
+
+ mesh_hdr = (struct ieee80211s_hdr *)(eth + 1);
+ if (!mesh_hdr->ttl)
+ return RX_DROP_MONITOR;
+
+ /* frame is in RMC, don't forward */
+ if (is_multicast_ether_addr(eth->h_dest) &&
+ mesh_rmc_check(sdata, eth->h_source, mesh_hdr))
+ return RX_DROP_MONITOR;
+
+ /* forward packet */
+ if (sdata->crypto_tx_tailroom_needed_cnt)
+ tailroom = IEEE80211_ENCRYPT_TAILROOM;
+
+ if (mesh_hdr->flags & MESH_FLAGS_AE) {
+ struct mesh_path *mppath;
+ char *proxied_addr;
+ bool update = false;
+
+ if (multicast)
+ proxied_addr = mesh_hdr->eaddr1;
+ else if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6)
+ /* has_a4 already checked in ieee80211_rx_mesh_check */
+ proxied_addr = mesh_hdr->eaddr2;
+ else
+ return RX_DROP_MONITOR;
+
+ rcu_read_lock();
+ mppath = mpp_path_lookup(sdata, proxied_addr);
+ if (!mppath) {
+ mpp_path_add(sdata, proxied_addr, eth->h_source);
+ } else {
+ spin_lock_bh(&mppath->state_lock);
+ if (!ether_addr_equal(mppath->mpp, eth->h_source)) {
+ memcpy(mppath->mpp, eth->h_source, ETH_ALEN);
+ update = true;
+ }
+ mppath->exp_time = jiffies;
+ spin_unlock_bh(&mppath->state_lock);
+ }
+
+ /* flush fast xmit cache if the address path changed */
+ if (update)
+ mesh_fast_tx_flush_addr(sdata, proxied_addr);
+
+ rcu_read_unlock();
+ }
+
+ /* Frame has reached destination. Don't forward */
+ if (ether_addr_equal(sdata->vif.addr, eth->h_dest))
+ goto rx_accept;
+
+ if (!--mesh_hdr->ttl) {
+ if (multicast)
+ goto rx_accept;
+
+ IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
+ return RX_DROP_MONITOR;
+ }
+
+ if (!ifmsh->mshcfg.dot11MeshForwarding) {
+ if (is_multicast_ether_addr(eth->h_dest))
+ goto rx_accept;
+
+ return RX_DROP_MONITOR;
+ }
+
+ skb_set_queue_mapping(skb, ieee802_1d_to_ac[skb->priority]);
+
+ if (!multicast &&
+ ieee80211_rx_mesh_fast_forward(sdata, skb, mesh_hdrlen))
+ return RX_QUEUED;
+
+ ieee80211_fill_mesh_addresses(&hdr, &hdr.frame_control,
+ eth->h_dest, eth->h_source);
+ hdrlen = ieee80211_hdrlen(hdr.frame_control);
+ if (multicast) {
+ int extra_head = sizeof(struct ieee80211_hdr) - sizeof(*eth);
+
+ fwd_skb = skb_copy_expand(skb, local->tx_headroom + extra_head +
+ IEEE80211_ENCRYPT_HEADROOM,
+ tailroom, GFP_ATOMIC);
+ if (!fwd_skb)
+ goto rx_accept;
+ } else {
+ fwd_skb = skb;
+ skb = NULL;
+
+ if (skb_cow_head(fwd_skb, hdrlen - sizeof(struct ethhdr)))
+ return RX_DROP_UNUSABLE;
+
+ if (skb_linearize(fwd_skb))
+ return RX_DROP_UNUSABLE;
+ }
+
+ fwd_hdr = skb_push(fwd_skb, hdrlen - sizeof(struct ethhdr));
+ memcpy(fwd_hdr, &hdr, hdrlen - 2);
+ qos = ieee80211_get_qos_ctl(fwd_hdr);
+ qos[0] = qos[1] = 0;
+
+ skb_reset_mac_header(fwd_skb);
+ hdrlen += mesh_hdrlen;
+ if (ieee80211_get_8023_tunnel_proto(fwd_skb->data + hdrlen,
+ &fwd_skb->protocol))
+ hdrlen += ETH_ALEN;
+ else
+ fwd_skb->protocol = htons(fwd_skb->len - hdrlen);
+ skb_set_network_header(fwd_skb, hdrlen + 2);
+
+ info = IEEE80211_SKB_CB(fwd_skb);
+ memset(info, 0, sizeof(*info));
+ info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
+ info->control.vif = &sdata->vif;
+ info->control.jiffies = jiffies;
+ fwd_skb->dev = sdata->dev;
+ if (multicast) {
+ IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
+ memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
+ /* update power mode indication when forwarding */
+ ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
+ } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
+ /* mesh power mode flags updated in mesh_nexthop_lookup */
+ IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
+ } else {
+ /* unable to resolve next hop */
+ if (sta)
+ mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
+ hdr.addr3, 0,
+ WLAN_REASON_MESH_PATH_NOFORWARD,
+ sta->sta.addr);
+ IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
+ kfree_skb(fwd_skb);
+ goto rx_accept;
+ }
+
+ IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
+ ieee80211_add_pending_skb(local, fwd_skb);
+
+rx_accept:
+ if (!skb)
+ return RX_QUEUED;
+
+ ieee80211_strip_8023_mesh_hdr(skb);
+#endif
+
+ return RX_CONTINUE;
+}
+
+static ieee80211_rx_result debug_noinline
+__ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
+{
+ struct net_device *dev = rx->sdata->dev;
+ struct sk_buff *skb = rx->skb;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ __le16 fc = hdr->frame_control;
+ struct sk_buff_head frame_list;
+ ieee80211_rx_result res;
+ struct ethhdr ethhdr;
+ const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
+
+ if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
+ check_da = NULL;
+ check_sa = NULL;
+ } else switch (rx->sdata->vif.type) {
+ case NL80211_IFTYPE_AP:
+ case NL80211_IFTYPE_AP_VLAN:
+ check_da = NULL;
+ break;
+ case NL80211_IFTYPE_STATION:
+ if (!rx->sta ||
+ !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
+ check_sa = NULL;
+ break;
+ case NL80211_IFTYPE_MESH_POINT:
+ check_sa = NULL;
+ check_da = NULL;
+ break;
+ default:
+ break;
+ }
+
+ skb->dev = dev;
+ __skb_queue_head_init(&frame_list);
+
+ if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
+ rx->sdata->vif.addr,
+ rx->sdata->vif.type,
+ data_offset, true))
+ return RX_DROP_UNUSABLE;
+
+ if (rx->sta->amsdu_mesh_control < 0) {
+ s8 valid = -1;
+ int i;
+
+ for (i = 0; i <= 2; i++) {
+ if (!ieee80211_is_valid_amsdu(skb, i))
+ continue;
+
+ if (valid >= 0) {
+ /* ambiguous */
+ valid = -1;
+ break;
+ }
+
+ valid = i;
+ }
+
+ rx->sta->amsdu_mesh_control = valid;
+ }
+
+ ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
+ rx->sdata->vif.type,
+ rx->local->hw.extra_tx_headroom,
+ check_da, check_sa,
+ rx->sta->amsdu_mesh_control);
+
+ while (!skb_queue_empty(&frame_list)) {
+ rx->skb = __skb_dequeue(&frame_list);
+
+ res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
+ switch (res) {
+ case RX_QUEUED:
+ continue;
+ case RX_CONTINUE:
+ break;
+ default:
+ goto free;
+ }
+
+ if (!ieee80211_frame_allowed(rx, fc))
+ goto free;
+
+ ieee80211_deliver_skb(rx);
+ continue;
+
+free:
+ dev_kfree_skb(rx->skb);
+ }
+
+ return RX_QUEUED;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
+{
+ struct sk_buff *skb = rx->skb;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ __le16 fc = hdr->frame_control;
+
+ if (!(status->rx_flags & IEEE80211_RX_AMSDU))
+ return RX_CONTINUE;
+
+ if (unlikely(!ieee80211_is_data(fc)))
+ return RX_CONTINUE;
+
+ if (unlikely(!ieee80211_is_data_present(fc)))
+ return RX_DROP_MONITOR;
+
+ if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
+ switch (rx->sdata->vif.type) {
+ case NL80211_IFTYPE_AP_VLAN:
+ if (!rx->sdata->u.vlan.sta)
+ return RX_DROP_UNUSABLE;
+ break;
+ case NL80211_IFTYPE_STATION:
+ if (!rx->sdata->u.mgd.use_4addr)
+ return RX_DROP_UNUSABLE;
+ break;
+ case NL80211_IFTYPE_MESH_POINT:
+ break;
+ default:
+ return RX_DROP_UNUSABLE;
+ }
+ }
+
+ if (is_multicast_ether_addr(hdr->addr1) || !rx->sta)
+ return RX_DROP_UNUSABLE;
+
+ if (rx->key) {
+ /*
+ * We should not receive A-MSDUs on pre-HT connections,
+ * and HT connections cannot use old ciphers. Thus drop
+ * them, as in those cases we couldn't even have SPP
+ * A-MSDUs or such.
+ */
+ switch (rx->key->conf.cipher) {
+ case WLAN_CIPHER_SUITE_WEP40:
+ case WLAN_CIPHER_SUITE_WEP104:
+ case WLAN_CIPHER_SUITE_TKIP:
+ return RX_DROP_UNUSABLE;
+ default:
+ break;
+ }
+ }
+
+ return __ieee80211_rx_h_amsdu(rx, 0);
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_sub_if_data *sdata = rx->sdata;
+ struct ieee80211_local *local = rx->local;
+ struct net_device *dev = sdata->dev;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+ __le16 fc = hdr->frame_control;
+ ieee80211_rx_result res;
+ bool port_control;
+ int err;
+
+ if (unlikely(!ieee80211_is_data(hdr->frame_control)))
+ return RX_CONTINUE;
+
+ if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
+ return RX_DROP_MONITOR;
+
+ /*
+ * Send unexpected-4addr-frame event to hostapd. For older versions,
+ * also drop the frame to cooked monitor interfaces.
+ */
+ if (ieee80211_has_a4(hdr->frame_control) &&
+ sdata->vif.type == NL80211_IFTYPE_AP) {
+ if (rx->sta &&
+ !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
+ cfg80211_rx_unexpected_4addr_frame(
+ rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
+ return RX_DROP_MONITOR;
+ }
+
+ err = __ieee80211_data_to_8023(rx, &port_control);
+ if (unlikely(err))
+ return RX_DROP_UNUSABLE;
+
+ res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
+ if (res != RX_CONTINUE)
+ return res;
+
+ if (!ieee80211_frame_allowed(rx, fc))
+ return RX_DROP_MONITOR;
+
+ /* directly handle TDLS channel switch requests/responses */
+ if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
+ cpu_to_be16(ETH_P_TDLS))) {
+ struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
+
+ if (pskb_may_pull(rx->skb,
+ offsetof(struct ieee80211_tdls_data, u)) &&
+ tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
+ tf->category == WLAN_CATEGORY_TDLS &&
+ (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
+ tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
+ rx->skb->protocol = cpu_to_be16(ETH_P_TDLS);
+ __ieee80211_queue_skb_to_iface(sdata, rx->link_id,
+ rx->sta, rx->skb);
+ return RX_QUEUED;
+ }
+ }
+
+ if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
+ unlikely(port_control) && sdata->bss) {
+ sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
+ u.ap);
+ dev = sdata->dev;
+ rx->sdata = sdata;
+ }
+
+ rx->skb->dev = dev;
+
+ if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
+ local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
+ !is_multicast_ether_addr(
+ ((struct ethhdr *)rx->skb->data)->h_dest) &&
+ (!local->scanning &&
+ !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
+ mod_timer(&local->dynamic_ps_timer, jiffies +
+ msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
+
+ ieee80211_deliver_skb(rx);
+
+ return RX_QUEUED;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
+{
+ struct sk_buff *skb = rx->skb;
+ struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
+ struct tid_ampdu_rx *tid_agg_rx;
+ u16 start_seq_num;
+ u16 tid;
+
+ if (likely(!ieee80211_is_ctl(bar->frame_control)))
+ return RX_CONTINUE;
+
+ if (ieee80211_is_back_req(bar->frame_control)) {
+ struct {
+ __le16 control, start_seq_num;
+ } __packed bar_data;
+ struct ieee80211_event event = {
+ .type = BAR_RX_EVENT,
+ };
+
+ if (!rx->sta)
+ return RX_DROP_MONITOR;
+
+ if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
+ &bar_data, sizeof(bar_data)))
+ return RX_DROP_MONITOR;
+
+ tid = le16_to_cpu(bar_data.control) >> 12;
+
+ if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
+ !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
+ ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
+ WLAN_BACK_RECIPIENT,
+ WLAN_REASON_QSTA_REQUIRE_SETUP);
+
+ tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
+ if (!tid_agg_rx)
+ return RX_DROP_MONITOR;
+
+ start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
+ event.u.ba.tid = tid;
+ event.u.ba.ssn = start_seq_num;
+ event.u.ba.sta = &rx->sta->sta;
+
+ /* reset session timer */
+ if (tid_agg_rx->timeout)
+ mod_timer(&tid_agg_rx->session_timer,
+ TU_TO_EXP_TIME(tid_agg_rx->timeout));
+
+ spin_lock(&tid_agg_rx->reorder_lock);
+ /* release stored frames up to start of BAR */
+ ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
+ start_seq_num, frames);
+ spin_unlock(&tid_agg_rx->reorder_lock);
+
+ drv_event_callback(rx->local, rx->sdata, &event);
+
+ kfree_skb(skb);
+ return RX_QUEUED;
+ }
+
+ /*
+ * After this point, we only want management frames,
+ * so we can drop all remaining control frames to
+ * cooked monitor interfaces.
+ */
+ return RX_DROP_MONITOR;
+}
+
+static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt,
+ size_t len)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct sk_buff *skb;
+ struct ieee80211_mgmt *resp;
+
+ if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
+ /* Not to own unicast address */
+ return;
+ }
+
+ if (!ether_addr_equal(mgmt->sa, sdata->deflink.u.mgd.bssid) ||
+ !ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid)) {
+ /* Not from the current AP or not associated yet. */
+ return;
+ }
+
+ if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
+ /* Too short SA Query request frame */
+ return;
+ }
+
+ skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
+ if (skb == NULL)
+ return;
+
+ skb_reserve(skb, local->hw.extra_tx_headroom);
+ resp = skb_put_zero(skb, 24);
+ memcpy(resp->da, mgmt->sa, ETH_ALEN);
+ memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
+ memcpy(resp->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
+ resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
+ IEEE80211_STYPE_ACTION);
+ skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
+ resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
+ resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
+ memcpy(resp->u.action.u.sa_query.trans_id,
+ mgmt->u.action.u.sa_query.trans_id,
+ WLAN_SA_QUERY_TR_ID_LEN);
+
+ ieee80211_tx_skb(sdata, skb);
+}
+
+static void
+ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
+ const struct element *ie;
+ size_t baselen;
+
+ if (!wiphy_ext_feature_isset(rx->local->hw.wiphy,
+ NL80211_EXT_FEATURE_BSS_COLOR))
+ return;
+
+ if (ieee80211_hw_check(&rx->local->hw, DETECTS_COLOR_COLLISION))
+ return;
+
+ if (rx->sdata->vif.bss_conf.csa_active)
+ return;
+
+ baselen = mgmt->u.beacon.variable - rx->skb->data;
+ if (baselen > rx->skb->len)
+ return;
+
+ ie = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION,
+ mgmt->u.beacon.variable,
+ rx->skb->len - baselen);
+ if (ie && ie->datalen >= sizeof(struct ieee80211_he_operation) &&
+ ie->datalen >= ieee80211_he_oper_size(ie->data + 1)) {
+ struct ieee80211_bss_conf *bss_conf = &rx->sdata->vif.bss_conf;
+ const struct ieee80211_he_operation *he_oper;
+ u8 color;
+
+ he_oper = (void *)(ie->data + 1);
+ if (le32_get_bits(he_oper->he_oper_params,
+ IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED))
+ return;
+
+ color = le32_get_bits(he_oper->he_oper_params,
+ IEEE80211_HE_OPERATION_BSS_COLOR_MASK);
+ if (color == bss_conf->he_bss_color.color)
+ ieee80211_obss_color_collision_notify(&rx->sdata->vif,
+ BIT_ULL(color),
+ GFP_ATOMIC);
+ }
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+
+ if (ieee80211_is_s1g_beacon(mgmt->frame_control))
+ return RX_CONTINUE;
+
+ /*
+ * From here on, look only at management frames.
+ * Data and control frames are already handled,
+ * and unknown (reserved) frames are useless.
+ */
+ if (rx->skb->len < 24)
+ return RX_DROP_MONITOR;
+
+ if (!ieee80211_is_mgmt(mgmt->frame_control))
+ return RX_DROP_MONITOR;
+
+ /* drop too small action frames */
+ if (ieee80211_is_action(mgmt->frame_control) &&
+ rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
+ return RX_DROP_UNUSABLE;
+
+ if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
+ ieee80211_is_beacon(mgmt->frame_control) &&
+ !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
+ int sig = 0;
+
+ /* sw bss color collision detection */
+ ieee80211_rx_check_bss_color_collision(rx);
+
+ if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
+ !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
+ sig = status->signal;
+
+ cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy,
+ rx->skb->data, rx->skb->len,
+ ieee80211_rx_status_to_khz(status),
+ sig);
+ rx->flags |= IEEE80211_RX_BEACON_REPORTED;
+ }
+
+ if (ieee80211_drop_unencrypted_mgmt(rx))
+ return RX_DROP_UNUSABLE;
+
+ return RX_CONTINUE;
+}
+
+static bool
+ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data;
+ struct ieee80211_sub_if_data *sdata = rx->sdata;
+
+ /* TWT actions are only supported in AP for the moment */
+ if (sdata->vif.type != NL80211_IFTYPE_AP)
+ return false;
+
+ if (!rx->local->ops->add_twt_setup)
+ return false;
+
+ if (!sdata->vif.bss_conf.twt_responder)
+ return false;
+
+ if (!rx->sta)
+ return false;
+
+ switch (mgmt->u.action.u.s1g.action_code) {
+ case WLAN_S1G_TWT_SETUP: {
+ struct ieee80211_twt_setup *twt;
+
+ if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
+ 1 + /* action code */
+ sizeof(struct ieee80211_twt_setup) +
+ 2 /* TWT req_type agrt */)
+ break;
+
+ twt = (void *)mgmt->u.action.u.s1g.variable;
+ if (twt->element_id != WLAN_EID_S1G_TWT)
+ break;
+
+ if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
+ 4 + /* action code + token + tlv */
+ twt->length)
+ break;
+
+ return true; /* queue the frame */
+ }
+ case WLAN_S1G_TWT_TEARDOWN:
+ if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 2)
+ break;
+
+ return true; /* queue the frame */
+ default:
+ break;
+ }
+
+ return false;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_local *local = rx->local;
+ struct ieee80211_sub_if_data *sdata = rx->sdata;
+ struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+ int len = rx->skb->len;
+
+ if (!ieee80211_is_action(mgmt->frame_control))
+ return RX_CONTINUE;
+
+ if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
+ mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
+ mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
+ return RX_DROP_UNUSABLE;
+
+ switch (mgmt->u.action.category) {
+ case WLAN_CATEGORY_HT:
+ /* reject HT action frames from stations not supporting HT */
+ if (!rx->link_sta->pub->ht_cap.ht_supported)
+ goto invalid;
+
+ if (sdata->vif.type != NL80211_IFTYPE_STATION &&
+ sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
+ sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
+ sdata->vif.type != NL80211_IFTYPE_AP &&
+ sdata->vif.type != NL80211_IFTYPE_ADHOC)
+ break;
+
+ /* verify action & smps_control/chanwidth are present */
+ if (len < IEEE80211_MIN_ACTION_SIZE + 2)
+ goto invalid;
+
+ switch (mgmt->u.action.u.ht_smps.action) {
+ case WLAN_HT_ACTION_SMPS: {
+ struct ieee80211_supported_band *sband;
+ enum ieee80211_smps_mode smps_mode;
+ struct sta_opmode_info sta_opmode = {};
+
+ if (sdata->vif.type != NL80211_IFTYPE_AP &&
+ sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
+ goto handled;
+
+ /* convert to HT capability */
+ switch (mgmt->u.action.u.ht_smps.smps_control) {
+ case WLAN_HT_SMPS_CONTROL_DISABLED:
+ smps_mode = IEEE80211_SMPS_OFF;
+ break;
+ case WLAN_HT_SMPS_CONTROL_STATIC:
+ smps_mode = IEEE80211_SMPS_STATIC;
+ break;
+ case WLAN_HT_SMPS_CONTROL_DYNAMIC:
+ smps_mode = IEEE80211_SMPS_DYNAMIC;
+ break;
+ default:
+ goto invalid;
+ }
+
+ /* if no change do nothing */
+ if (rx->link_sta->pub->smps_mode == smps_mode)
+ goto handled;
+ rx->link_sta->pub->smps_mode = smps_mode;
+ sta_opmode.smps_mode =
+ ieee80211_smps_mode_to_smps_mode(smps_mode);
+ sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
+
+ sband = rx->local->hw.wiphy->bands[status->band];
+
+ rate_control_rate_update(local, sband, rx->sta, 0,
+ IEEE80211_RC_SMPS_CHANGED);
+ cfg80211_sta_opmode_change_notify(sdata->dev,
+ rx->sta->addr,
+ &sta_opmode,
+ GFP_ATOMIC);
+ goto handled;
+ }
+ case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
+ struct ieee80211_supported_band *sband;
+ u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
+ enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
+ struct sta_opmode_info sta_opmode = {};
+
+ /* If it doesn't support 40 MHz it can't change ... */
+ if (!(rx->link_sta->pub->ht_cap.cap &
+ IEEE80211_HT_CAP_SUP_WIDTH_20_40))
+ goto handled;
+
+ if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
+ max_bw = IEEE80211_STA_RX_BW_20;
+ else
+ max_bw = ieee80211_sta_cap_rx_bw(rx->link_sta);
+
+ /* set cur_max_bandwidth and recalc sta bw */
+ rx->link_sta->cur_max_bandwidth = max_bw;
+ new_bw = ieee80211_sta_cur_vht_bw(rx->link_sta);
+
+ if (rx->link_sta->pub->bandwidth == new_bw)
+ goto handled;
+
+ rx->link_sta->pub->bandwidth = new_bw;
+ sband = rx->local->hw.wiphy->bands[status->band];
+ sta_opmode.bw =
+ ieee80211_sta_rx_bw_to_chan_width(rx->link_sta);
+ sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
+
+ rate_control_rate_update(local, sband, rx->sta, 0,
+ IEEE80211_RC_BW_CHANGED);
+ cfg80211_sta_opmode_change_notify(sdata->dev,
+ rx->sta->addr,
+ &sta_opmode,
+ GFP_ATOMIC);
+ goto handled;
+ }
+ default:
+ goto invalid;
+ }
+
+ break;
+ case WLAN_CATEGORY_PUBLIC:
+ if (len < IEEE80211_MIN_ACTION_SIZE + 1)
+ goto invalid;
+ if (sdata->vif.type != NL80211_IFTYPE_STATION)
+ break;
+ if (!rx->sta)
+ break;
+ if (!ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid))
+ break;
+ if (mgmt->u.action.u.ext_chan_switch.action_code !=
+ WLAN_PUB_ACTION_EXT_CHANSW_ANN)
+ break;
+ if (len < offsetof(struct ieee80211_mgmt,
+ u.action.u.ext_chan_switch.variable))
+ goto invalid;
+ goto queue;
+ case WLAN_CATEGORY_VHT:
+ if (sdata->vif.type != NL80211_IFTYPE_STATION &&
+ sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
+ sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
+ sdata->vif.type != NL80211_IFTYPE_AP &&
+ sdata->vif.type != NL80211_IFTYPE_ADHOC)
+ break;
+
+ /* verify action code is present */
+ if (len < IEEE80211_MIN_ACTION_SIZE + 1)
+ goto invalid;
+
+ switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
+ case WLAN_VHT_ACTION_OPMODE_NOTIF: {
+ /* verify opmode is present */
+ if (len < IEEE80211_MIN_ACTION_SIZE + 2)
+ goto invalid;
+ goto queue;
+ }
+ case WLAN_VHT_ACTION_GROUPID_MGMT: {
+ if (len < IEEE80211_MIN_ACTION_SIZE + 25)
+ goto invalid;
+ goto queue;
+ }
+ default:
+ break;
+ }
+ break;
+ case WLAN_CATEGORY_BACK:
+ if (sdata->vif.type != NL80211_IFTYPE_STATION &&
+ sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
+ sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
+ sdata->vif.type != NL80211_IFTYPE_AP &&
+ sdata->vif.type != NL80211_IFTYPE_ADHOC)
+ break;
+
+ /* verify action_code is present */
+ if (len < IEEE80211_MIN_ACTION_SIZE + 1)
+ break;
+
+ switch (mgmt->u.action.u.addba_req.action_code) {
+ case WLAN_ACTION_ADDBA_REQ:
+ if (len < (IEEE80211_MIN_ACTION_SIZE +
+ sizeof(mgmt->u.action.u.addba_req)))
+ goto invalid;
+ break;
+ case WLAN_ACTION_ADDBA_RESP:
+ if (len < (IEEE80211_MIN_ACTION_SIZE +
+ sizeof(mgmt->u.action.u.addba_resp)))
+ goto invalid;
+ break;
+ case WLAN_ACTION_DELBA:
+ if (len < (IEEE80211_MIN_ACTION_SIZE +
+ sizeof(mgmt->u.action.u.delba)))
+ goto invalid;
+ break;
+ default:
+ goto invalid;
+ }
+
+ goto queue;
+ case WLAN_CATEGORY_SPECTRUM_MGMT:
+ /* verify action_code is present */
+ if (len < IEEE80211_MIN_ACTION_SIZE + 1)
+ break;
+
+ switch (mgmt->u.action.u.measurement.action_code) {
+ case WLAN_ACTION_SPCT_MSR_REQ:
+ if (status->band != NL80211_BAND_5GHZ)
+ break;
+
+ if (len < (IEEE80211_MIN_ACTION_SIZE +
+ sizeof(mgmt->u.action.u.measurement)))
+ break;
+
+ if (sdata->vif.type != NL80211_IFTYPE_STATION)
+ break;
+
+ ieee80211_process_measurement_req(sdata, mgmt, len);
+ goto handled;
+ case WLAN_ACTION_SPCT_CHL_SWITCH: {
+ u8 *bssid;
+ if (len < (IEEE80211_MIN_ACTION_SIZE +
+ sizeof(mgmt->u.action.u.chan_switch)))
+ break;
+
+ if (sdata->vif.type != NL80211_IFTYPE_STATION &&
+ sdata->vif.type != NL80211_IFTYPE_ADHOC &&
+ sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
+ break;
+
+ if (sdata->vif.type == NL80211_IFTYPE_STATION)
+ bssid = sdata->deflink.u.mgd.bssid;
+ else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
+ bssid = sdata->u.ibss.bssid;
+ else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
+ bssid = mgmt->sa;
+ else
+ break;
+
+ if (!ether_addr_equal(mgmt->bssid, bssid))
+ break;
+
+ goto queue;
+ }
+ }
+ break;
+ case WLAN_CATEGORY_SELF_PROTECTED:
+ if (len < (IEEE80211_MIN_ACTION_SIZE +
+ sizeof(mgmt->u.action.u.self_prot.action_code)))
+ break;
+
+ switch (mgmt->u.action.u.self_prot.action_code) {
+ case WLAN_SP_MESH_PEERING_OPEN:
+ case WLAN_SP_MESH_PEERING_CLOSE:
+ case WLAN_SP_MESH_PEERING_CONFIRM:
+ if (!ieee80211_vif_is_mesh(&sdata->vif))
+ goto invalid;
+ if (sdata->u.mesh.user_mpm)
+ /* userspace handles this frame */
+ break;
+ goto queue;
+ case WLAN_SP_MGK_INFORM:
+ case WLAN_SP_MGK_ACK:
+ if (!ieee80211_vif_is_mesh(&sdata->vif))
+ goto invalid;
+ break;
+ }
+ break;
+ case WLAN_CATEGORY_MESH_ACTION:
+ if (len < (IEEE80211_MIN_ACTION_SIZE +
+ sizeof(mgmt->u.action.u.mesh_action.action_code)))
+ break;
+
+ if (!ieee80211_vif_is_mesh(&sdata->vif))
+ break;
+ if (mesh_action_is_path_sel(mgmt) &&
+ !mesh_path_sel_is_hwmp(sdata))
+ break;
+ goto queue;
+ case WLAN_CATEGORY_S1G:
+ if (len < offsetofend(typeof(*mgmt),
+ u.action.u.s1g.action_code))
+ break;
+
+ switch (mgmt->u.action.u.s1g.action_code) {
+ case WLAN_S1G_TWT_SETUP:
+ case WLAN_S1G_TWT_TEARDOWN:
+ if (ieee80211_process_rx_twt_action(rx))
+ goto queue;
+ break;
+ default:
+ break;
+ }
+ break;
+ }
+
+ return RX_CONTINUE;
+
+ invalid:
+ status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
+ /* will return in the next handlers */
+ return RX_CONTINUE;
+
+ handled:
+ if (rx->sta)
+ rx->link_sta->rx_stats.packets++;
+ dev_kfree_skb(rx->skb);
+ return RX_QUEUED;
+
+ queue:
+ ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
+ return RX_QUEUED;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+ struct cfg80211_rx_info info = {
+ .freq = ieee80211_rx_status_to_khz(status),
+ .buf = rx->skb->data,
+ .len = rx->skb->len,
+ .link_id = rx->link_id,
+ .have_link_id = rx->link_id >= 0,
+ };
+
+ /* skip known-bad action frames and return them in the next handler */
+ if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
+ return RX_CONTINUE;
+
+ /*
+ * Getting here means the kernel doesn't know how to handle
+ * it, but maybe userspace does ... include returned frames
+ * so userspace can register for those to know whether ones
+ * it transmitted were processed or returned.
+ */
+
+ if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
+ !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
+ info.sig_dbm = status->signal;
+
+ if (ieee80211_is_timing_measurement(rx->skb) ||
+ ieee80211_is_ftm(rx->skb)) {
+ info.rx_tstamp = ktime_to_ns(skb_hwtstamps(rx->skb)->hwtstamp);
+ info.ack_tstamp = ktime_to_ns(status->ack_tx_hwtstamp);
+ }
+
+ if (cfg80211_rx_mgmt_ext(&rx->sdata->wdev, &info)) {
+ if (rx->sta)
+ rx->link_sta->rx_stats.packets++;
+ dev_kfree_skb(rx->skb);
+ return RX_QUEUED;
+ }
+
+ return RX_CONTINUE;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_sub_if_data *sdata = rx->sdata;
+ struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
+ int len = rx->skb->len;
+
+ if (!ieee80211_is_action(mgmt->frame_control))
+ return RX_CONTINUE;
+
+ switch (mgmt->u.action.category) {
+ case WLAN_CATEGORY_SA_QUERY:
+ if (len < (IEEE80211_MIN_ACTION_SIZE +
+ sizeof(mgmt->u.action.u.sa_query)))
+ break;
+
+ switch (mgmt->u.action.u.sa_query.action) {
+ case WLAN_ACTION_SA_QUERY_REQUEST:
+ if (sdata->vif.type != NL80211_IFTYPE_STATION)
+ break;
+ ieee80211_process_sa_query_req(sdata, mgmt, len);
+ goto handled;
+ }
+ break;
+ }
+
+ return RX_CONTINUE;
+
+ handled:
+ if (rx->sta)
+ rx->link_sta->rx_stats.packets++;
+ dev_kfree_skb(rx->skb);
+ return RX_QUEUED;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_local *local = rx->local;
+ struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
+ struct sk_buff *nskb;
+ struct ieee80211_sub_if_data *sdata = rx->sdata;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+
+ if (!ieee80211_is_action(mgmt->frame_control))
+ return RX_CONTINUE;
+
+ /*
+ * For AP mode, hostapd is responsible for handling any action
+ * frames that we didn't handle, including returning unknown
+ * ones. For all other modes we will return them to the sender,
+ * setting the 0x80 bit in the action category, as required by
+ * 802.11-2012 9.24.4.
+ * Newer versions of hostapd shall also use the management frame
+ * registration mechanisms, but older ones still use cooked
+ * monitor interfaces so push all frames there.
+ */
+ if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
+ (sdata->vif.type == NL80211_IFTYPE_AP ||
+ sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
+ return RX_DROP_MONITOR;
+
+ if (is_multicast_ether_addr(mgmt->da))
+ return RX_DROP_MONITOR;
+
+ /* do not return rejected action frames */
+ if (mgmt->u.action.category & 0x80)
+ return RX_DROP_UNUSABLE;
+
+ nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
+ GFP_ATOMIC);
+ if (nskb) {
+ struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
+
+ nmgmt->u.action.category |= 0x80;
+ memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
+ memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
+
+ memset(nskb->cb, 0, sizeof(nskb->cb));
+
+ if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
+
+ info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
+ IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
+ IEEE80211_TX_CTL_NO_CCK_RATE;
+ if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
+ info->hw_queue =
+ local->hw.offchannel_tx_hw_queue;
+ }
+
+ __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, -1,
+ status->band);
+ }
+ dev_kfree_skb(rx->skb);
+ return RX_QUEUED;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_ext(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_sub_if_data *sdata = rx->sdata;
+ struct ieee80211_hdr *hdr = (void *)rx->skb->data;
+
+ if (!ieee80211_is_ext(hdr->frame_control))
+ return RX_CONTINUE;
+
+ if (sdata->vif.type != NL80211_IFTYPE_STATION)
+ return RX_DROP_MONITOR;
+
+ /* for now only beacons are ext, so queue them */
+ ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
+
+ return RX_QUEUED;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_sub_if_data *sdata = rx->sdata;
+ struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
+ __le16 stype;
+
+ stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
+
+ if (!ieee80211_vif_is_mesh(&sdata->vif) &&
+ sdata->vif.type != NL80211_IFTYPE_ADHOC &&
+ sdata->vif.type != NL80211_IFTYPE_OCB &&
+ sdata->vif.type != NL80211_IFTYPE_STATION)
+ return RX_DROP_MONITOR;
+
+ switch (stype) {
+ case cpu_to_le16(IEEE80211_STYPE_AUTH):
+ case cpu_to_le16(IEEE80211_STYPE_BEACON):
+ case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
+ /* process for all: mesh, mlme, ibss */
+ break;
+ case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
+ if (is_multicast_ether_addr(mgmt->da) &&
+ !is_broadcast_ether_addr(mgmt->da))
+ return RX_DROP_MONITOR;
+
+ /* process only for station/IBSS */
+ if (sdata->vif.type != NL80211_IFTYPE_STATION &&
+ sdata->vif.type != NL80211_IFTYPE_ADHOC)
+ return RX_DROP_MONITOR;
+ break;
+ case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
+ case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
+ case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
+ if (is_multicast_ether_addr(mgmt->da) &&
+ !is_broadcast_ether_addr(mgmt->da))
+ return RX_DROP_MONITOR;
+
+ /* process only for station */
+ if (sdata->vif.type != NL80211_IFTYPE_STATION)
+ return RX_DROP_MONITOR;
+ break;
+ case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
+ /* process only for ibss and mesh */
+ if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
+ sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
+ return RX_DROP_MONITOR;
+ break;
+ default:
+ return RX_DROP_MONITOR;
+ }
+
+ ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
+
+ return RX_QUEUED;
+}
+
+static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
+ struct ieee80211_rate *rate,
+ ieee80211_rx_result reason)
+{
+ struct ieee80211_sub_if_data *sdata;
+ struct ieee80211_local *local = rx->local;
+ struct sk_buff *skb = rx->skb, *skb2;
+ struct net_device *prev_dev = NULL;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+ int needed_headroom;
+
+ /*
+ * If cooked monitor has been processed already, then
+ * don't do it again. If not, set the flag.
+ */
+ if (rx->flags & IEEE80211_RX_CMNTR)
+ goto out_free_skb;
+ rx->flags |= IEEE80211_RX_CMNTR;
+
+ /* If there are no cooked monitor interfaces, just free the SKB */
+ if (!local->cooked_mntrs)
+ goto out_free_skb;
+
+ /* room for the radiotap header based on driver features */
+ needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
+
+ if (skb_headroom(skb) < needed_headroom &&
+ pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
+ goto out_free_skb;
+
+ /* prepend radiotap information */
+ ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
+ false);
+
+ skb_reset_mac_header(skb);
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ skb->pkt_type = PACKET_OTHERHOST;
+ skb->protocol = htons(ETH_P_802_2);
+
+ list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+ if (!ieee80211_sdata_running(sdata))
+ continue;
+
+ if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
+ !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
+ continue;
+
+ if (prev_dev) {
+ skb2 = skb_clone(skb, GFP_ATOMIC);
+ if (skb2) {
+ skb2->dev = prev_dev;
+ netif_receive_skb(skb2);
+ }
+ }
+
+ prev_dev = sdata->dev;
+ dev_sw_netstats_rx_add(sdata->dev, skb->len);
+ }
+
+ if (prev_dev) {
+ skb->dev = prev_dev;
+ netif_receive_skb(skb);
+ return;
+ }
+
+ out_free_skb:
+ kfree_skb_reason(skb, (__force u32)reason);
+}
+
+static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
+ ieee80211_rx_result res)
+{
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+ struct ieee80211_supported_band *sband;
+ struct ieee80211_rate *rate = NULL;
+
+ if (res == RX_QUEUED) {
+ I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
+ return;
+ }
+
+ if (res != RX_CONTINUE) {
+ I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
+ if (rx->sta)
+ rx->link_sta->rx_stats.dropped++;
+ }
+
+ if (u32_get_bits((__force u32)res, SKB_DROP_REASON_SUBSYS_MASK) ==
+ SKB_DROP_REASON_SUBSYS_MAC80211_UNUSABLE) {
+ kfree_skb_reason(rx->skb, (__force u32)res);
+ return;
+ }
+
+ sband = rx->local->hw.wiphy->bands[status->band];
+ if (status->encoding == RX_ENC_LEGACY)
+ rate = &sband->bitrates[status->rate_idx];
+
+ ieee80211_rx_cooked_monitor(rx, rate, res);
+}
+
+static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
+ struct sk_buff_head *frames)
+{
+ ieee80211_rx_result res = RX_DROP_MONITOR;
+ struct sk_buff *skb;
+
+#define CALL_RXH(rxh) \
+ do { \
+ res = rxh(rx); \
+ if (res != RX_CONTINUE) \
+ goto rxh_next; \
+ } while (0)
+
+ /* Lock here to avoid hitting all of the data used in the RX
+ * path (e.g. key data, station data, ...) concurrently when
+ * a frame is released from the reorder buffer due to timeout
+ * from the timer, potentially concurrently with RX from the
+ * driver.
+ */
+ spin_lock_bh(&rx->local->rx_path_lock);
+
+ while ((skb = __skb_dequeue(frames))) {
+ /*
+ * all the other fields are valid across frames
+ * that belong to an aMPDU since they are on the
+ * same TID from the same station
+ */
+ rx->skb = skb;
+
+ if (WARN_ON_ONCE(!rx->link))
+ goto rxh_next;
+
+ CALL_RXH(ieee80211_rx_h_check_more_data);
+ CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
+ CALL_RXH(ieee80211_rx_h_sta_process);
+ CALL_RXH(ieee80211_rx_h_decrypt);
+ CALL_RXH(ieee80211_rx_h_defragment);
+ CALL_RXH(ieee80211_rx_h_michael_mic_verify);
+ /* must be after MMIC verify so header is counted in MPDU mic */
+ CALL_RXH(ieee80211_rx_h_amsdu);
+ CALL_RXH(ieee80211_rx_h_data);
+
+ /* special treatment -- needs the queue */
+ res = ieee80211_rx_h_ctrl(rx, frames);
+ if (res != RX_CONTINUE)
+ goto rxh_next;
+
+ CALL_RXH(ieee80211_rx_h_mgmt_check);
+ CALL_RXH(ieee80211_rx_h_action);
+ CALL_RXH(ieee80211_rx_h_userspace_mgmt);
+ CALL_RXH(ieee80211_rx_h_action_post_userspace);
+ CALL_RXH(ieee80211_rx_h_action_return);
+ CALL_RXH(ieee80211_rx_h_ext);
+ CALL_RXH(ieee80211_rx_h_mgmt);
+
+ rxh_next:
+ ieee80211_rx_handlers_result(rx, res);
+
+#undef CALL_RXH
+ }
+
+ spin_unlock_bh(&rx->local->rx_path_lock);
+}
+
+static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
+{
+ struct sk_buff_head reorder_release;
+ ieee80211_rx_result res = RX_DROP_MONITOR;
+
+ __skb_queue_head_init(&reorder_release);
+
+#define CALL_RXH(rxh) \
+ do { \
+ res = rxh(rx); \
+ if (res != RX_CONTINUE) \
+ goto rxh_next; \
+ } while (0)
+
+ CALL_RXH(ieee80211_rx_h_check_dup);
+ CALL_RXH(ieee80211_rx_h_check);
+
+ ieee80211_rx_reorder_ampdu(rx, &reorder_release);
+
+ ieee80211_rx_handlers(rx, &reorder_release);
+ return;
+
+ rxh_next:
+ ieee80211_rx_handlers_result(rx, res);
+
+#undef CALL_RXH
+}
+
+static bool
+ieee80211_rx_is_valid_sta_link_id(struct ieee80211_sta *sta, u8 link_id)
+{
+ return !!(sta->valid_links & BIT(link_id));
+}
+
+static bool ieee80211_rx_data_set_link(struct ieee80211_rx_data *rx,
+ u8 link_id)
+{
+ rx->link_id = link_id;
+ rx->link = rcu_dereference(rx->sdata->link[link_id]);
+
+ if (!rx->sta)
+ return rx->link;
+
+ if (!ieee80211_rx_is_valid_sta_link_id(&rx->sta->sta, link_id))
+ return false;
+
+ rx->link_sta = rcu_dereference(rx->sta->link[link_id]);
+
+ return rx->link && rx->link_sta;
+}
+
+static bool ieee80211_rx_data_set_sta(struct ieee80211_rx_data *rx,
+ struct sta_info *sta, int link_id)
+{
+ rx->link_id = link_id;
+ rx->sta = sta;
+
+ if (sta) {
+ rx->local = sta->sdata->local;
+ if (!rx->sdata)
+ rx->sdata = sta->sdata;
+ rx->link_sta = &sta->deflink;
+ } else {
+ rx->link_sta = NULL;
+ }
+
+ if (link_id < 0)
+ rx->link = &rx->sdata->deflink;
+ else if (!ieee80211_rx_data_set_link(rx, link_id))
+ return false;
+
+ return true;
+}
+
+/*
+ * This function makes calls into the RX path, therefore
+ * it has to be invoked under RCU read lock.
+ */
+void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
+{
+ struct sk_buff_head frames;
+ struct ieee80211_rx_data rx = {
+ /* This is OK -- must be QoS data frame */
+ .security_idx = tid,
+ .seqno_idx = tid,
+ };
+ struct tid_ampdu_rx *tid_agg_rx;
+ int link_id = -1;
+
+ /* FIXME: statistics won't be right with this */
+ if (sta->sta.valid_links)
+ link_id = ffs(sta->sta.valid_links) - 1;
+
+ if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
+ return;
+
+ tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
+ if (!tid_agg_rx)
+ return;
+
+ __skb_queue_head_init(&frames);
+
+ spin_lock(&tid_agg_rx->reorder_lock);
+ ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
+ spin_unlock(&tid_agg_rx->reorder_lock);
+
+ if (!skb_queue_empty(&frames)) {
+ struct ieee80211_event event = {
+ .type = BA_FRAME_TIMEOUT,
+ .u.ba.tid = tid,
+ .u.ba.sta = &sta->sta,
+ };
+ drv_event_callback(rx.local, rx.sdata, &event);
+ }
+
+ ieee80211_rx_handlers(&rx, &frames);
+}
+
+void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
+ u16 ssn, u64 filtered,
+ u16 received_mpdus)
+{
+ struct ieee80211_local *local;
+ struct sta_info *sta;
+ struct tid_ampdu_rx *tid_agg_rx;
+ struct sk_buff_head frames;
+ struct ieee80211_rx_data rx = {
+ /* This is OK -- must be QoS data frame */
+ .security_idx = tid,
+ .seqno_idx = tid,
+ };
+ int i, diff;
+
+ if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
+ return;
+
+ __skb_queue_head_init(&frames);
+
+ sta = container_of(pubsta, struct sta_info, sta);
+
+ local = sta->sdata->local;
+ WARN_ONCE(local->hw.max_rx_aggregation_subframes > 64,
+ "RX BA marker can't support max_rx_aggregation_subframes %u > 64\n",
+ local->hw.max_rx_aggregation_subframes);
+
+ if (!ieee80211_rx_data_set_sta(&rx, sta, -1))
+ return;
+
+ rcu_read_lock();
+ tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
+ if (!tid_agg_rx)
+ goto out;
+
+ spin_lock_bh(&tid_agg_rx->reorder_lock);
+
+ if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
+ int release;
+
+ /* release all frames in the reorder buffer */
+ release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
+ IEEE80211_SN_MODULO;
+ ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
+ release, &frames);
+ /* update ssn to match received ssn */
+ tid_agg_rx->head_seq_num = ssn;
+ } else {
+ ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
+ &frames);
+ }
+
+ /* handle the case that received ssn is behind the mac ssn.
+ * it can be tid_agg_rx->buf_size behind and still be valid */
+ diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
+ if (diff >= tid_agg_rx->buf_size) {
+ tid_agg_rx->reorder_buf_filtered = 0;
+ goto release;
+ }
+ filtered = filtered >> diff;
+ ssn += diff;
+
+ /* update bitmap */
+ for (i = 0; i < tid_agg_rx->buf_size; i++) {
+ int index = (ssn + i) % tid_agg_rx->buf_size;
+
+ tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
+ if (filtered & BIT_ULL(i))
+ tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
+ }
+
+ /* now process also frames that the filter marking released */
+ ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
+
+release:
+ spin_unlock_bh(&tid_agg_rx->reorder_lock);
+
+ ieee80211_rx_handlers(&rx, &frames);
+
+ out:
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
+
+/* main receive path */
+
+static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
+{
+ return ether_addr_equal(raddr, addr) ||
+ is_broadcast_ether_addr(raddr);
+}
+
+static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_sub_if_data *sdata = rx->sdata;
+ struct sk_buff *skb = rx->skb;
+ struct ieee80211_hdr *hdr = (void *)skb->data;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+ u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
+ bool multicast = is_multicast_ether_addr(hdr->addr1) ||
+ ieee80211_is_s1g_beacon(hdr->frame_control);
+
+ switch (sdata->vif.type) {
+ case NL80211_IFTYPE_STATION:
+ if (!bssid && !sdata->u.mgd.use_4addr)
+ return false;
+ if (ieee80211_is_first_frag(hdr->seq_ctrl) &&
+ ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
+ return false;
+ if (multicast)
+ return true;
+ return ieee80211_is_our_addr(sdata, hdr->addr1, &rx->link_id);
+ case NL80211_IFTYPE_ADHOC:
+ if (!bssid)
+ return false;
+ if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
+ ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) ||
+ !is_valid_ether_addr(hdr->addr2))
+ return false;
+ if (ieee80211_is_beacon(hdr->frame_control))
+ return true;
+ if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
+ return false;
+ if (!multicast &&
+ !ether_addr_equal(sdata->vif.addr, hdr->addr1))
+ return false;
+ if (!rx->sta) {
+ int rate_idx;
+ if (status->encoding != RX_ENC_LEGACY)
+ rate_idx = 0; /* TODO: HT/VHT rates */
+ else
+ rate_idx = status->rate_idx;
+ ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
+ BIT(rate_idx));
+ }
+ return true;
+ case NL80211_IFTYPE_OCB:
+ if (!bssid)
+ return false;
+ if (!ieee80211_is_data_present(hdr->frame_control))
+ return false;
+ if (!is_broadcast_ether_addr(bssid))
+ return false;
+ if (!multicast &&
+ !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
+ return false;
+ if (!rx->sta) {
+ int rate_idx;
+ if (status->encoding != RX_ENC_LEGACY)
+ rate_idx = 0; /* TODO: HT rates */
+ else
+ rate_idx = status->rate_idx;
+ ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
+ BIT(rate_idx));
+ }
+ return true;
+ case NL80211_IFTYPE_MESH_POINT:
+ if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
+ return false;
+ if (multicast)
+ return true;
+ return ether_addr_equal(sdata->vif.addr, hdr->addr1);
+ case NL80211_IFTYPE_AP_VLAN:
+ case NL80211_IFTYPE_AP:
+ if (!bssid)
+ return ieee80211_is_our_addr(sdata, hdr->addr1,
+ &rx->link_id);
+
+ if (!is_broadcast_ether_addr(bssid) &&
+ !ieee80211_is_our_addr(sdata, bssid, NULL)) {
+ /*
+ * Accept public action frames even when the
+ * BSSID doesn't match, this is used for P2P
+ * and location updates. Note that mac80211
+ * itself never looks at these frames.
+ */
+ if (!multicast &&
+ !ieee80211_is_our_addr(sdata, hdr->addr1,
+ &rx->link_id))
+ return false;
+ if (ieee80211_is_public_action(hdr, skb->len))
+ return true;
+ return ieee80211_is_beacon(hdr->frame_control);
+ }
+
+ if (!ieee80211_has_tods(hdr->frame_control)) {
+ /* ignore data frames to TDLS-peers */
+ if (ieee80211_is_data(hdr->frame_control))
+ return false;
+ /* ignore action frames to TDLS-peers */
+ if (ieee80211_is_action(hdr->frame_control) &&
+ !is_broadcast_ether_addr(bssid) &&
+ !ether_addr_equal(bssid, hdr->addr1))
+ return false;
+ }
+
+ /*
+ * 802.11-2016 Table 9-26 says that for data frames, A1 must be
+ * the BSSID - we've checked that already but may have accepted
+ * the wildcard (ff:ff:ff:ff:ff:ff).
+ *
+ * It also says:
+ * The BSSID of the Data frame is determined as follows:
+ * a) If the STA is contained within an AP or is associated
+ * with an AP, the BSSID is the address currently in use
+ * by the STA contained in the AP.
+ *
+ * So we should not accept data frames with an address that's
+ * multicast.
+ *
+ * Accepting it also opens a security problem because stations
+ * could encrypt it with the GTK and inject traffic that way.
+ */
+ if (ieee80211_is_data(hdr->frame_control) && multicast)
+ return false;
+
+ return true;
+ case NL80211_IFTYPE_P2P_DEVICE:
+ return ieee80211_is_public_action(hdr, skb->len) ||
+ ieee80211_is_probe_req(hdr->frame_control) ||
+ ieee80211_is_probe_resp(hdr->frame_control) ||
+ ieee80211_is_beacon(hdr->frame_control);
+ case NL80211_IFTYPE_NAN:
+ /* Currently no frames on NAN interface are allowed */
+ return false;
+ default:
+ break;
+ }
+
+ WARN_ON_ONCE(1);
+ return false;
+}
+
+void ieee80211_check_fast_rx(struct sta_info *sta)
+{
+ struct ieee80211_sub_if_data *sdata = sta->sdata;
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_key *key;
+ struct ieee80211_fast_rx fastrx = {
+ .dev = sdata->dev,
+ .vif_type = sdata->vif.type,
+ .control_port_protocol = sdata->control_port_protocol,
+ }, *old, *new = NULL;
+ u32 offload_flags;
+ bool set_offload = false;
+ bool assign = false;
+ bool offload;
+
+ /* use sparse to check that we don't return without updating */
+ __acquire(check_fast_rx);
+
+ BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
+ BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
+ ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
+ ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
+
+ fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
+
+ /* fast-rx doesn't do reordering */
+ if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
+ !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
+ goto clear;
+
+ switch (sdata->vif.type) {
+ case NL80211_IFTYPE_STATION:
+ if (sta->sta.tdls) {
+ fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
+ fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
+ fastrx.expected_ds_bits = 0;
+ } else {
+ fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
+ fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
+ fastrx.expected_ds_bits =
+ cpu_to_le16(IEEE80211_FCTL_FROMDS);
+ }
+
+ if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
+ fastrx.expected_ds_bits |=
+ cpu_to_le16(IEEE80211_FCTL_TODS);
+ fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
+ fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
+ }
+
+ if (!sdata->u.mgd.powersave)
+ break;
+
+ /* software powersave is a huge mess, avoid all of it */
+ if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
+ goto clear;
+ if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
+ !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
+ goto clear;
+ break;
+ case NL80211_IFTYPE_AP_VLAN:
+ case NL80211_IFTYPE_AP:
+ /* parallel-rx requires this, at least with calls to
+ * ieee80211_sta_ps_transition()
+ */
+ if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
+ goto clear;
+ fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
+ fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
+ fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
+
+ fastrx.internal_forward =
+ !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
+ (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
+ !sdata->u.vlan.sta);
+
+ if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
+ sdata->u.vlan.sta) {
+ fastrx.expected_ds_bits |=
+ cpu_to_le16(IEEE80211_FCTL_FROMDS);
+ fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
+ fastrx.internal_forward = 0;
+ }
+
+ break;
+ case NL80211_IFTYPE_MESH_POINT:
+ fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_FROMDS |
+ IEEE80211_FCTL_TODS);
+ fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
+ fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
+ break;
+ default:
+ goto clear;
+ }
+
+ if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
+ goto clear;
+
+ rcu_read_lock();
+ key = rcu_dereference(sta->ptk[sta->ptk_idx]);
+ if (!key)
+ key = rcu_dereference(sdata->default_unicast_key);
+ if (key) {
+ switch (key->conf.cipher) {
+ case WLAN_CIPHER_SUITE_TKIP:
+ /* we don't want to deal with MMIC in fast-rx */
+ goto clear_rcu;
+ case WLAN_CIPHER_SUITE_CCMP:
+ case WLAN_CIPHER_SUITE_CCMP_256:
+ case WLAN_CIPHER_SUITE_GCMP:
+ case WLAN_CIPHER_SUITE_GCMP_256:
+ break;
+ default:
+ /* We also don't want to deal with
+ * WEP or cipher scheme.
+ */
+ goto clear_rcu;
+ }
+
+ fastrx.key = true;
+ fastrx.icv_len = key->conf.icv_len;
+ }
+
+ assign = true;
+ clear_rcu:
+ rcu_read_unlock();
+ clear:
+ __release(check_fast_rx);
+
+ if (assign)
+ new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
+
+ offload_flags = get_bss_sdata(sdata)->vif.offload_flags;
+ offload = offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED;
+
+ if (assign && offload)
+ set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
+ else
+ set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
+
+ if (set_offload)
+ drv_sta_set_decap_offload(local, sdata, &sta->sta, assign);
+
+ spin_lock_bh(&sta->lock);
+ old = rcu_dereference_protected(sta->fast_rx, true);
+ rcu_assign_pointer(sta->fast_rx, new);
+ spin_unlock_bh(&sta->lock);
+
+ if (old)
+ kfree_rcu(old, rcu_head);
+}
+
+void ieee80211_clear_fast_rx(struct sta_info *sta)
+{
+ struct ieee80211_fast_rx *old;
+
+ spin_lock_bh(&sta->lock);
+ old = rcu_dereference_protected(sta->fast_rx, true);
+ RCU_INIT_POINTER(sta->fast_rx, NULL);
+ spin_unlock_bh(&sta->lock);
+
+ if (old)
+ kfree_rcu(old, rcu_head);
+}
+
+void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct sta_info *sta;
+
+ lockdep_assert_held(&local->sta_mtx);
+
+ list_for_each_entry(sta, &local->sta_list, list) {
+ if (sdata != sta->sdata &&
+ (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
+ continue;
+ ieee80211_check_fast_rx(sta);
+ }
+}
+
+void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_local *local = sdata->local;
+
+ mutex_lock(&local->sta_mtx);
+ __ieee80211_check_fast_rx_iface(sdata);
+ mutex_unlock(&local->sta_mtx);
+}
+
+static void ieee80211_rx_8023(struct ieee80211_rx_data *rx,
+ struct ieee80211_fast_rx *fast_rx,
+ int orig_len)
+{
+ struct ieee80211_sta_rx_stats *stats;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+ struct sta_info *sta = rx->sta;
+ struct link_sta_info *link_sta;
+ struct sk_buff *skb = rx->skb;
+ void *sa = skb->data + ETH_ALEN;
+ void *da = skb->data;
+
+ if (rx->link_id >= 0) {
+ link_sta = rcu_dereference(sta->link[rx->link_id]);
+ if (WARN_ON_ONCE(!link_sta)) {
+ dev_kfree_skb(rx->skb);
+ return;
+ }
+ } else {
+ link_sta = &sta->deflink;
+ }
+
+ stats = &link_sta->rx_stats;
+ if (fast_rx->uses_rss)
+ stats = this_cpu_ptr(link_sta->pcpu_rx_stats);
+
+ /* statistics part of ieee80211_rx_h_sta_process() */
+ if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
+ stats->last_signal = status->signal;
+ if (!fast_rx->uses_rss)
+ ewma_signal_add(&link_sta->rx_stats_avg.signal,
+ -status->signal);
+ }
+
+ if (status->chains) {
+ int i;
+
+ stats->chains = status->chains;
+ for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
+ int signal = status->chain_signal[i];
+
+ if (!(status->chains & BIT(i)))
+ continue;
+
+ stats->chain_signal_last[i] = signal;
+ if (!fast_rx->uses_rss)
+ ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i],
+ -signal);
+ }
+ }
+ /* end of statistics */
+
+ stats->last_rx = jiffies;
+ stats->last_rate = sta_stats_encode_rate(status);
+
+ stats->fragments++;
+ stats->packets++;
+
+ skb->dev = fast_rx->dev;
+
+ dev_sw_netstats_rx_add(fast_rx->dev, skb->len);
+
+ /* The seqno index has the same property as needed
+ * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
+ * for non-QoS-data frames. Here we know it's a data
+ * frame, so count MSDUs.
+ */
+ u64_stats_update_begin(&stats->syncp);
+ stats->msdu[rx->seqno_idx]++;
+ stats->bytes += orig_len;
+ u64_stats_update_end(&stats->syncp);
+
+ if (fast_rx->internal_forward) {
+ struct sk_buff *xmit_skb = NULL;
+ if (is_multicast_ether_addr(da)) {
+ xmit_skb = skb_copy(skb, GFP_ATOMIC);
+ } else if (!ether_addr_equal(da, sa) &&
+ sta_info_get(rx->sdata, da)) {
+ xmit_skb = skb;
+ skb = NULL;
+ }
+
+ if (xmit_skb) {
+ /*
+ * Send to wireless media and increase priority by 256
+ * to keep the received priority instead of
+ * reclassifying the frame (see cfg80211_classify8021d).
+ */
+ xmit_skb->priority += 256;
+ xmit_skb->protocol = htons(ETH_P_802_3);
+ skb_reset_network_header(xmit_skb);
+ skb_reset_mac_header(xmit_skb);
+ dev_queue_xmit(xmit_skb);
+ }
+
+ if (!skb)
+ return;
+ }
+
+ /* deliver to local stack */
+ skb->protocol = eth_type_trans(skb, fast_rx->dev);
+ ieee80211_deliver_skb_to_local_stack(skb, rx);
+}
+
+static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
+ struct ieee80211_fast_rx *fast_rx)
+{
+ struct sk_buff *skb = rx->skb;
+ struct ieee80211_hdr *hdr = (void *)skb->data;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+ static ieee80211_rx_result res;
+ int orig_len = skb->len;
+ int hdrlen = ieee80211_hdrlen(hdr->frame_control);
+ int snap_offs = hdrlen;
+ struct {
+ u8 snap[sizeof(rfc1042_header)];
+ __be16 proto;
+ } *payload __aligned(2);
+ struct {
+ u8 da[ETH_ALEN];
+ u8 sa[ETH_ALEN];
+ } addrs __aligned(2);
+ struct ieee80211_sta_rx_stats *stats;
+
+ /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
+ * to a common data structure; drivers can implement that per queue
+ * but we don't have that information in mac80211
+ */
+ if (!(status->flag & RX_FLAG_DUP_VALIDATED))
+ return false;
+
+#define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
+
+ /* If using encryption, we also need to have:
+ * - PN_VALIDATED: similar, but the implementation is tricky
+ * - DECRYPTED: necessary for PN_VALIDATED
+ */
+ if (fast_rx->key &&
+ (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
+ return false;
+
+ if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
+ return false;
+
+ if (unlikely(ieee80211_is_frag(hdr)))
+ return false;
+
+ /* Since our interface address cannot be multicast, this
+ * implicitly also rejects multicast frames without the
+ * explicit check.
+ *
+ * We shouldn't get any *data* frames not addressed to us
+ * (AP mode will accept multicast *management* frames), but
+ * punting here will make it go through the full checks in
+ * ieee80211_accept_frame().
+ */
+ if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
+ return false;
+
+ if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
+ IEEE80211_FCTL_TODS)) !=
+ fast_rx->expected_ds_bits)
+ return false;
+
+ /* assign the key to drop unencrypted frames (later)
+ * and strip the IV/MIC if necessary
+ */
+ if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
+ /* GCMP header length is the same */
+ snap_offs += IEEE80211_CCMP_HDR_LEN;
+ }
+
+ if (!ieee80211_vif_is_mesh(&rx->sdata->vif) &&
+ !(status->rx_flags & IEEE80211_RX_AMSDU)) {
+ if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
+ return false;
+
+ payload = (void *)(skb->data + snap_offs);
+
+ if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
+ return false;
+
+ /* Don't handle these here since they require special code.
+ * Accept AARP and IPX even though they should come with a
+ * bridge-tunnel header - but if we get them this way then
+ * there's little point in discarding them.
+ */
+ if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
+ payload->proto == fast_rx->control_port_protocol))
+ return false;
+ }
+
+ /* after this point, don't punt to the slowpath! */
+
+ if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
+ pskb_trim(skb, skb->len - fast_rx->icv_len))
+ goto drop;
+
+ if (rx->key && !ieee80211_has_protected(hdr->frame_control))
+ goto drop;
+
+ if (status->rx_flags & IEEE80211_RX_AMSDU) {
+ if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
+ RX_QUEUED)
+ goto drop;
+
+ return true;
+ }
+
+ /* do the header conversion - first grab the addresses */
+ ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
+ ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
+ if (ieee80211_vif_is_mesh(&rx->sdata->vif)) {
+ skb_pull(skb, snap_offs - 2);
+ put_unaligned_be16(skb->len - 2, skb->data);
+ } else {
+ skb_postpull_rcsum(skb, skb->data + snap_offs,
+ sizeof(rfc1042_header) + 2);
+
+ /* remove the SNAP but leave the ethertype */
+ skb_pull(skb, snap_offs + sizeof(rfc1042_header));
+ }
+ /* push the addresses in front */
+ memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
+
+ res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
+ switch (res) {
+ case RX_QUEUED:
+ return true;
+ case RX_CONTINUE:
+ break;
+ default:
+ goto drop;
+ }
+
+ ieee80211_rx_8023(rx, fast_rx, orig_len);
+
+ return true;
+ drop:
+ dev_kfree_skb(skb);
+
+ if (fast_rx->uses_rss)
+ stats = this_cpu_ptr(rx->link_sta->pcpu_rx_stats);
+ else
+ stats = &rx->link_sta->rx_stats;
+
+ stats->dropped++;
+ return true;
+}
+
+/*
+ * This function returns whether or not the SKB
+ * was destined for RX processing or not, which,
+ * if consume is true, is equivalent to whether
+ * or not the skb was consumed.
+ */
+static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
+ struct sk_buff *skb, bool consume)
+{
+ struct ieee80211_local *local = rx->local;
+ struct ieee80211_sub_if_data *sdata = rx->sdata;
+ struct ieee80211_hdr *hdr = (void *)skb->data;
+ struct link_sta_info *link_sta = rx->link_sta;
+ struct ieee80211_link_data *link = rx->link;
+
+ rx->skb = skb;
+
+ /* See if we can do fast-rx; if we have to copy we already lost,
+ * so punt in that case. We should never have to deliver a data
+ * frame to multiple interfaces anyway.
+ *
+ * We skip the ieee80211_accept_frame() call and do the necessary
+ * checking inside ieee80211_invoke_fast_rx().
+ */
+ if (consume && rx->sta) {
+ struct ieee80211_fast_rx *fast_rx;
+
+ fast_rx = rcu_dereference(rx->sta->fast_rx);
+ if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
+ return true;
+ }
+
+ if (!ieee80211_accept_frame(rx))
+ return false;
+
+ if (!consume) {
+ struct skb_shared_hwtstamps *shwt;
+
+ rx->skb = skb_copy(skb, GFP_ATOMIC);
+ if (!rx->skb) {
+ if (net_ratelimit())
+ wiphy_debug(local->hw.wiphy,
+ "failed to copy skb for %s\n",
+ sdata->name);
+ return true;
+ }
+
+ /* skb_copy() does not copy the hw timestamps, so copy it
+ * explicitly
+ */
+ shwt = skb_hwtstamps(rx->skb);
+ shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp;
+
+ /* Update the hdr pointer to the new skb for translation below */
+ hdr = (struct ieee80211_hdr *)rx->skb->data;
+ }
+
+ if (unlikely(rx->sta && rx->sta->sta.mlo) &&
+ is_unicast_ether_addr(hdr->addr1) &&
+ !ieee80211_is_probe_resp(hdr->frame_control) &&
+ !ieee80211_is_beacon(hdr->frame_control)) {
+ /* translate to MLD addresses */
+ if (ether_addr_equal(link->conf->addr, hdr->addr1))
+ ether_addr_copy(hdr->addr1, rx->sdata->vif.addr);
+ if (ether_addr_equal(link_sta->addr, hdr->addr2))
+ ether_addr_copy(hdr->addr2, rx->sta->addr);
+ /* translate A3 only if it's the BSSID */
+ if (!ieee80211_has_tods(hdr->frame_control) &&
+ !ieee80211_has_fromds(hdr->frame_control)) {
+ if (ether_addr_equal(link_sta->addr, hdr->addr3))
+ ether_addr_copy(hdr->addr3, rx->sta->addr);
+ else if (ether_addr_equal(link->conf->addr, hdr->addr3))
+ ether_addr_copy(hdr->addr3, rx->sdata->vif.addr);
+ }
+ /* not needed for A4 since it can only carry the SA */
+ }
+
+ ieee80211_invoke_rx_handlers(rx);
+ return true;
+}
+
+static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw,
+ struct ieee80211_sta *pubsta,
+ struct sk_buff *skb,
+ struct list_head *list)
+{
+ struct ieee80211_local *local = hw_to_local(hw);
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+ struct ieee80211_fast_rx *fast_rx;
+ struct ieee80211_rx_data rx;
+ struct sta_info *sta;
+ int link_id = -1;
+
+ memset(&rx, 0, sizeof(rx));
+ rx.skb = skb;
+ rx.local = local;
+ rx.list = list;
+ rx.link_id = -1;
+
+ I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
+
+ /* drop frame if too short for header */
+ if (skb->len < sizeof(struct ethhdr))
+ goto drop;
+
+ if (!pubsta)
+ goto drop;
+
+ if (status->link_valid)
+ link_id = status->link_id;
+
+ /*
+ * TODO: Should the frame be dropped if the right link_id is not
+ * available? Or may be it is fine in the current form to proceed with
+ * the frame processing because with frame being in 802.3 format,
+ * link_id is used only for stats purpose and updating the stats on
+ * the deflink is fine?
+ */
+ sta = container_of(pubsta, struct sta_info, sta);
+ if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
+ goto drop;
+
+ fast_rx = rcu_dereference(rx.sta->fast_rx);
+ if (!fast_rx)
+ goto drop;
+
+ ieee80211_rx_8023(&rx, fast_rx, skb->len);
+ return;
+
+drop:
+ dev_kfree_skb(skb);
+}
+
+static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx,
+ struct sk_buff *skb, bool consume)
+{
+ struct link_sta_info *link_sta;
+ struct ieee80211_hdr *hdr = (void *)skb->data;
+ struct sta_info *sta;
+ int link_id = -1;
+
+ /*
+ * Look up link station first, in case there's a
+ * chance that they might have a link address that
+ * is identical to the MLD address, that way we'll
+ * have the link information if needed.
+ */
+ link_sta = link_sta_info_get_bss(rx->sdata, hdr->addr2);
+ if (link_sta) {
+ sta = link_sta->sta;
+ link_id = link_sta->link_id;
+ } else {
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+
+ sta = sta_info_get_bss(rx->sdata, hdr->addr2);
+ if (status->link_valid)
+ link_id = status->link_id;
+ }
+
+ if (!ieee80211_rx_data_set_sta(rx, sta, link_id))
+ return false;
+
+ return ieee80211_prepare_and_rx_handle(rx, skb, consume);
+}
+
+/*
+ * This is the actual Rx frames handler. as it belongs to Rx path it must
+ * be called with rcu_read_lock protection.
+ */
+static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
+ struct ieee80211_sta *pubsta,
+ struct sk_buff *skb,
+ struct list_head *list)
+{
+ struct ieee80211_local *local = hw_to_local(hw);
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+ struct ieee80211_sub_if_data *sdata;
+ struct ieee80211_hdr *hdr;
+ __le16 fc;
+ struct ieee80211_rx_data rx;
+ struct ieee80211_sub_if_data *prev;
+ struct rhlist_head *tmp;
+ int err = 0;
+
+ fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
+ memset(&rx, 0, sizeof(rx));
+ rx.skb = skb;
+ rx.local = local;
+ rx.list = list;
+ rx.link_id = -1;
+
+ if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
+ I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
+
+ if (ieee80211_is_mgmt(fc)) {
+ /* drop frame if too short for header */
+ if (skb->len < ieee80211_hdrlen(fc))
+ err = -ENOBUFS;
+ else
+ err = skb_linearize(skb);
+ } else {
+ err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
+ }
+
+ if (err) {
+ dev_kfree_skb(skb);
+ return;
+ }
+
+ hdr = (struct ieee80211_hdr *)skb->data;
+ ieee80211_parse_qos(&rx);
+ ieee80211_verify_alignment(&rx);
+
+ if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
+ ieee80211_is_beacon(hdr->frame_control) ||
+ ieee80211_is_s1g_beacon(hdr->frame_control)))
+ ieee80211_scan_rx(local, skb);
+
+ if (ieee80211_is_data(fc)) {
+ struct sta_info *sta, *prev_sta;
+ int link_id = -1;
+
+ if (status->link_valid)
+ link_id = status->link_id;
+
+ if (pubsta) {
+ sta = container_of(pubsta, struct sta_info, sta);
+ if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
+ goto out;
+
+ /*
+ * In MLO connection, fetch the link_id using addr2
+ * when the driver does not pass link_id in status.
+ * When the address translation is already performed by
+ * driver/hw, the valid link_id must be passed in
+ * status.
+ */
+
+ if (!status->link_valid && pubsta->mlo) {
+ struct ieee80211_hdr *hdr = (void *)skb->data;
+ struct link_sta_info *link_sta;
+
+ link_sta = link_sta_info_get_bss(rx.sdata,
+ hdr->addr2);
+ if (!link_sta)
+ goto out;
+
+ ieee80211_rx_data_set_link(&rx, link_sta->link_id);
+ }
+
+ if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
+ return;
+ goto out;
+ }
+
+ prev_sta = NULL;
+
+ for_each_sta_info(local, hdr->addr2, sta, tmp) {
+ if (!prev_sta) {
+ prev_sta = sta;
+ continue;
+ }
+
+ rx.sdata = prev_sta->sdata;
+ if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id))
+ goto out;
+
+ if (!status->link_valid && prev_sta->sta.mlo)
+ continue;
+
+ ieee80211_prepare_and_rx_handle(&rx, skb, false);
+
+ prev_sta = sta;
+ }
+
+ if (prev_sta) {
+ rx.sdata = prev_sta->sdata;
+ if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id))
+ goto out;
+
+ if (!status->link_valid && prev_sta->sta.mlo)
+ goto out;
+
+ if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
+ return;
+ goto out;
+ }
+ }
+
+ prev = NULL;
+
+ list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+ if (!ieee80211_sdata_running(sdata))
+ continue;
+
+ if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
+ sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+ continue;
+
+ /*
+ * frame is destined for this interface, but if it's
+ * not also for the previous one we handle that after
+ * the loop to avoid copying the SKB once too much
+ */
+
+ if (!prev) {
+ prev = sdata;
+ continue;
+ }
+
+ rx.sdata = prev;
+ ieee80211_rx_for_interface(&rx, skb, false);
+
+ prev = sdata;
+ }
+
+ if (prev) {
+ rx.sdata = prev;
+
+ if (ieee80211_rx_for_interface(&rx, skb, true))
+ return;
+ }
+
+ out:
+ dev_kfree_skb(skb);
+}
+
+/*
+ * This is the receive path handler. It is called by a low level driver when an
+ * 802.11 MPDU is received from the hardware.
+ */
+void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
+ struct sk_buff *skb, struct list_head *list)
+{
+ struct ieee80211_local *local = hw_to_local(hw);
+ struct ieee80211_rate *rate = NULL;
+ struct ieee80211_supported_band *sband;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+
+ WARN_ON_ONCE(softirq_count() == 0);
+
+ if (WARN_ON(status->band >= NUM_NL80211_BANDS))
+ goto drop;
+
+ sband = local->hw.wiphy->bands[status->band];
+ if (WARN_ON(!sband))
+ goto drop;
+
+ /*
+ * If we're suspending, it is possible although not too likely
+ * that we'd be receiving frames after having already partially
+ * quiesced the stack. We can't process such frames then since
+ * that might, for example, cause stations to be added or other
+ * driver callbacks be invoked.
+ */
+ if (unlikely(local->quiescing || local->suspended))
+ goto drop;
+
+ /* We might be during a HW reconfig, prevent Rx for the same reason */
+ if (unlikely(local->in_reconfig))
+ goto drop;
+
+ /*
+ * The same happens when we're not even started,
+ * but that's worth a warning.
+ */
+ if (WARN_ON(!local->started))
+ goto drop;
+
+ if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
+ /*
+ * Validate the rate, unless a PLCP error means that
+ * we probably can't have a valid rate here anyway.
+ */
+
+ switch (status->encoding) {
+ case RX_ENC_HT:
+ /*
+ * rate_idx is MCS index, which can be [0-76]
+ * as documented on:
+ *
+ * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n
+ *
+ * Anything else would be some sort of driver or
+ * hardware error. The driver should catch hardware
+ * errors.
+ */
+ if (WARN(status->rate_idx > 76,
+ "Rate marked as an HT rate but passed "
+ "status->rate_idx is not "
+ "an MCS index [0-76]: %d (0x%02x)\n",
+ status->rate_idx,
+ status->rate_idx))
+ goto drop;
+ break;
+ case RX_ENC_VHT:
+ if (WARN_ONCE(status->rate_idx > 11 ||
+ !status->nss ||
+ status->nss > 8,
+ "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
+ status->rate_idx, status->nss))
+ goto drop;
+ break;
+ case RX_ENC_HE:
+ if (WARN_ONCE(status->rate_idx > 11 ||
+ !status->nss ||
+ status->nss > 8,
+ "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
+ status->rate_idx, status->nss))
+ goto drop;
+ break;
+ case RX_ENC_EHT:
+ if (WARN_ONCE(status->rate_idx > 15 ||
+ !status->nss ||
+ status->nss > 8 ||
+ status->eht.gi > NL80211_RATE_INFO_EHT_GI_3_2,
+ "Rate marked as an EHT rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n",
+ status->rate_idx, status->nss, status->eht.gi))
+ goto drop;
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ fallthrough;
+ case RX_ENC_LEGACY:
+ if (WARN_ON(status->rate_idx >= sband->n_bitrates))
+ goto drop;
+ rate = &sband->bitrates[status->rate_idx];
+ }
+ }
+
+ if (WARN_ON_ONCE(status->link_id >= IEEE80211_LINK_UNSPECIFIED))
+ goto drop;
+
+ status->rx_flags = 0;
+
+ kcov_remote_start_common(skb_get_kcov_handle(skb));
+
+ /*
+ * Frames with failed FCS/PLCP checksum are not returned,
+ * all other frames are returned without radiotap header
+ * if it was previously present.
+ * Also, frames with less than 16 bytes are dropped.
+ */
+ if (!(status->flag & RX_FLAG_8023))
+ skb = ieee80211_rx_monitor(local, skb, rate);
+ if (skb) {
+ if ((status->flag & RX_FLAG_8023) ||
+ ieee80211_is_data_present(hdr->frame_control))
+ ieee80211_tpt_led_trig_rx(local, skb->len);
+
+ if (status->flag & RX_FLAG_8023)
+ __ieee80211_rx_handle_8023(hw, pubsta, skb, list);
+ else
+ __ieee80211_rx_handle_packet(hw, pubsta, skb, list);
+ }
+
+ kcov_remote_stop();
+ return;
+ drop:
+ kfree_skb(skb);
+}
+EXPORT_SYMBOL(ieee80211_rx_list);
+
+void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
+ struct sk_buff *skb, struct napi_struct *napi)
+{
+ struct sk_buff *tmp;
+ LIST_HEAD(list);
+
+
+ /*
+ * key references and virtual interfaces are protected using RCU
+ * and this requires that we are in a read-side RCU section during
+ * receive processing
+ */
+ rcu_read_lock();
+ ieee80211_rx_list(hw, pubsta, skb, &list);
+ rcu_read_unlock();
+
+ if (!napi) {
+ netif_receive_skb_list(&list);
+ return;
+ }
+
+ list_for_each_entry_safe(skb, tmp, &list, list) {
+ skb_list_del_init(skb);
+ napi_gro_receive(napi, skb);
+ }
+}
+EXPORT_SYMBOL(ieee80211_rx_napi);
+
+/* This is a version of the rx handler that can be called from hard irq
+ * context. Post the skb on the queue and schedule the tasklet */
+void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
+{
+ struct ieee80211_local *local = hw_to_local(hw);
+
+ BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
+
+ skb->pkt_type = IEEE80211_RX_MSG;
+ skb_queue_tail(&local->skb_queue, skb);
+ tasklet_schedule(&local->tasklet);
+}
+EXPORT_SYMBOL(ieee80211_rx_irqsafe);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 13:38:30 +0000