diff options
Diffstat (limited to 'net/mac80211/rx.c')
| -rw-r--r-- | net/mac80211/rx.c | 4893 |
1 files changed, 4893 insertions, 0 deletions
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c new file mode 100644 index 000000000..97a63b940 --- /dev/null +++ b/net/mac80211/rx.c @@ -0,0 +1,4893 @@ +// 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) 2018-2021 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/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" + +static inline void ieee80211_rx_stats(struct net_device *dev, u32 len) +{ + struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); + + u64_stats_update_begin(&tstats->syncp); + tstats->rx_packets++; + tstats->rx_bytes += len; + u64_stats_update_end(&tstats->syncp); +} + +/* + * 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_hdr *hdr; + unsigned int hdrlen; + __le16 fc; + + if (present_fcs_len) + __pskb_trim(skb, skb->len - present_fcs_len); + __pskb_pull(skb, rtap_space); + + 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); + /* vendor presence bitmap */ + if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) + len += 4; + + 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_VENDOR_DATA) { + struct ieee80211_vendor_radiotap *rtap; + int vendor_data_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) + vendor_data_offset += + sizeof(struct ieee80211_radiotap_he); + if (status->flag & RX_FLAG_RADIOTAP_HE_MU) + vendor_data_offset += + sizeof(struct ieee80211_radiotap_he_mu); + if (status->flag & RX_FLAG_RADIOTAP_LSIG) + vendor_data_offset += + sizeof(struct ieee80211_radiotap_lsig); + + rtap = (void *)&skb->data[vendor_data_offset]; + + /* alignment for fixed 6-byte vendor data header */ + len = ALIGN(len, 2); + /* vendor data header */ + len += 6; + if (WARN_ON(rtap->align == 0)) + rtap->align = 1; + len = ALIGN(len, rtap->align); + len += rtap->len + rtap->pad; + } + + return len; +} + +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; + + skb_queue_tail(&sdata->skb_queue, skb); + ieee80211_queue_work(&sdata->local->hw, &sdata->work); +} + +/* + * 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; + int mpdulen, chain; + unsigned long chains = status->chains; + struct ieee80211_vendor_radiotap rtap = {}; + 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_VENDOR_DATA) { + rtap = *(struct ieee80211_vendor_radiotap *)skb->data; + /* rtap.len and rtap.pad are undone immediately */ + skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad); + } + + mpdulen = skb->len; + if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))) + mpdulen += FCS_LEN; + + rthdr = skb_push(skb, rtap_len); + memset(rthdr, 0, rtap_len - rtap.len - rtap.pad); + 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_VENDOR_DATA) { + it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) | + BIT(IEEE80211_RADIOTAP_EXT); + put_unaligned_le32(it_present_val, it_present); + it_present++; + it_present_val = rtap.present; + } + + put_unaligned_le32(it_present_val, it_present); + + pos = (void *)(it_present + 1); + + /* 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(1 << 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(1 << 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(1 << 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(1 << IEEE80211_RADIOTAP_MCS); + *pos++ = local->hw.radiotap_mcs_details; + *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(1 << IEEE80211_RADIOTAP_AMPDU_STATUS); + put_unaligned_le32(status->ampdu_reference, pos); + pos += 4; + if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN) + flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN; + if (status->flag & RX_FLAG_AMPDU_IS_LAST) + flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST; + if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR) + flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR; + if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) + flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN; + 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(1 << 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(1 << IEEE80211_RADIOTAP_TIMESTAMP); + + /* ensure 8 byte alignment */ + while ((pos - (u8 *)rthdr) & 7) + pos++; + + put_unaligned_le64(status->device_timestamp, pos); + pos += sizeof(u64); + + if (local->hw.radiotap_timestamp.accuracy >= 0) { + accuracy = local->hw.radiotap_timestamp.accuracy; + flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY; + } + put_unaligned_le16(accuracy, pos); + pos += sizeof(u16); + + *pos++ = local->hw.radiotap_timestamp.units_pos; + *pos++ = flags; + } + + 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(1 << 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(1 << 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(1 << 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(1 << 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; + } + + if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { + /* ensure 2 byte alignment for the vendor field as required */ + if ((pos - (u8 *)rthdr) & 1) + *pos++ = 0; + *pos++ = rtap.oui[0]; + *pos++ = rtap.oui[1]; + *pos++ = rtap.oui[2]; + *pos++ = rtap.subns; + put_unaligned_le16(rtap.len, pos); + pos += 2; + /* align the actual payload as requested */ + while ((pos - (u8 *)rthdr) & (rtap.align - 1)) + *pos++ = 0; + /* data (and possible padding) already follows */ + } +} + +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, 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 (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 (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) { + struct ieee80211_vendor_radiotap *rtap = + (void *)(origskb->data + rtap_space); + + rtap_space += sizeof(*rtap) + rtap->len + rtap->pad; + } + + 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; + ieee80211_rx_stats(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, + const struct ieee80211_cipher_scheme *cs) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + __le16 fc; + int hdrlen; + int minlen; + u8 key_idx_off; + u8 key_idx_shift; + u8 keyid; + + fc = hdr->frame_control; + hdrlen = ieee80211_hdrlen(fc); + + if (cs) { + minlen = hdrlen + cs->hdr_len; + key_idx_off = hdrlen + cs->key_idx_off; + key_idx_shift = cs->key_idx_shift; + } else { + /* WEP, TKIP, CCMP and GCMP */ + minlen = hdrlen + IEEE80211_WEP_IV_LEN; + key_idx_off = hdrlen + 3; + key_idx_shift = 6; + } + + if (unlikely(skb->len < minlen)) + return -EINVAL; + + skb_copy_bits(skb, key_idx_off, &keyid, 1); + + if (cs) + keyid &= cs->key_idx_mask; + keyid >>= key_idx_shift; + + /* cs could use more than the usual two bits for the keyid */ + if (unlikely(keyid >= NUM_DEFAULT_KEYS)) + return -EINVAL; + + 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 & 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: + 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_local *local = rx->local; + 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) { + skb_queue_tail(&rx->sdata->skb_queue, skb); + ieee80211_queue_work(&local->hw, &rx->sdata->work); + 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->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_WDS && + 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, ðertype, 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); + + if (!sta->sta.txq[0]) + return; + + 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 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) + 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)) { + sta->rx_stats.last_rx = jiffies; + if (ieee80211_is_data(hdr->frame_control) && + !is_multicast_ether_addr(hdr->addr1)) + sta->rx_stats.last_rate = + sta_stats_encode_rate(status); + } + } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) { + 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. + */ + sta->rx_stats.last_rx = jiffies; + if (ieee80211_is_data(hdr->frame_control)) + sta->rx_stats.last_rate = sta_stats_encode_rate(status); + } + + sta->rx_stats.fragments++; + + u64_stats_update_begin(&rx->sta->rx_stats.syncp); + sta->rx_stats.bytes += rx->skb->len; + u64_stats_update_end(&rx->sta->rx_stats.syncp); + + if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { + sta->rx_stats.last_signal = status->signal; + ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal); + } + + if (status->chains) { + 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; + + sta->rx_stats.chain_signal_last[i] = signal; + ewma_signal_add(&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_MONITOR; + } + /* + * Update counter and free packet here to avoid + * counting this as a dropped packed. + */ + 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; + struct ieee80211_sub_if_data *sdata = rx->sdata; + 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->sta) + key = rcu_dereference(rx->sta->gtk[idx]); + if (!key) + key = rcu_dereference(sdata->keys[idx]); + if (!key && rx->sta) + key = rcu_dereference(rx->sta->gtk[idx2]); + if (!key) + key = rcu_dereference(sdata->keys[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; + const struct ieee80211_cipher_scheme *cs = NULL; + + 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)) { + cs = rx->sta->cipher_scheme; + keyid = ieee80211_get_keyid(rx->skb, cs); + + 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_MONITOR; /* unexpected BIP 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_MONITOR; /* unexpected BIP keyidx */ + if (rx->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->sta->gtk[mmie_keyidx]); + } + if (!rx->key) + rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); + } else if (!ieee80211_has_protected(fc)) { + /* + * The frame was not protected, so skip decryption. However, we + * need to set rx->key if there is a key that could have been + * used so that the frame may be dropped if encryption would + * have been expected. + */ + struct ieee80211_key *key = NULL; + struct ieee80211_sub_if_data *sdata = rx->sdata; + int i; + + if (ieee80211_is_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->sdata->default_mgmt_key); + } else { + if (rx->sta) { + for (i = 0; i < NUM_DEFAULT_KEYS; i++) { + key = rcu_dereference(rx->sta->gtk[i]); + if (key) + break; + } + } + if (!key) { + for (i = 0; i < NUM_DEFAULT_KEYS; i++) { + key = rcu_dereference(sdata->keys[i]); + if (key) + break; + } + } + } + if (key) + rx->key = key; + return RX_CONTINUE; + } else { + /* + * 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, cs); + + if (unlikely(keyidx < 0)) + return RX_DROP_UNUSABLE; + + /* check per-station GTK first, if multicast packet */ + if (is_multicast_ether_addr(hdr->addr1) && rx->sta) + rx->key = rcu_dereference(rx->sta->gtk[keyidx]); + + /* if not found, try default key */ + if (!rx->key) { + rx->key = rcu_dereference(rx->sdata->keys[keyidx]); + + /* + * RSNA-protected unicast frames should always be + * sent with pairwise or station-to-station keys, + * but for WEP we allow using a key index as well. + */ + if (rx->key && + rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && + rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && + !is_multicast_ether_addr(hdr->addr1)) + rx->key = NULL; + } + } + + if (rx->key) { + if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) + return RX_DROP_MONITOR; + + /* TODO: add threshold stuff again */ + } else { + return RX_DROP_MONITOR; + } + + switch (rx->key->conf.cipher) { + case WLAN_CIPHER_SUITE_WEP40: + case WLAN_CIPHER_SUITE_WEP104: + result = ieee80211_crypto_wep_decrypt(rx); + break; + case WLAN_CIPHER_SUITE_TKIP: + result = ieee80211_crypto_tkip_decrypt(rx); + break; + case WLAN_CIPHER_SUITE_CCMP: + 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 = ieee80211_crypto_hw_decrypt(rx); + } + + /* 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) && result == RX_DROP_UNUSABLE && + 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->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 ieee80211_hdr *hdr = (void *)rx->skb->data; + 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; + + /* check mesh EAPOL frames first */ + if (unlikely(rx->sta && ieee80211_vif_is_mesh(&rx->sdata->vif) && + ieee80211_is_data(fc))) { + struct ieee80211s_hdr *mesh_hdr; + u16 hdr_len = ieee80211_hdrlen(fc); + u16 ethertype_offset; + __be16 ethertype; + + if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr)) + goto drop_check; + + /* make sure fixed part of mesh header is there, also checks skb len */ + if (!pskb_may_pull(rx->skb, hdr_len + 6)) + goto drop_check; + + mesh_hdr = (struct ieee80211s_hdr *)(skb->data + hdr_len); + ethertype_offset = hdr_len + ieee80211_get_mesh_hdrlen(mesh_hdr) + + sizeof(rfc1042_header); + + if (skb_copy_bits(rx->skb, ethertype_offset, ðertype, 2) == 0 && + ethertype == rx->sdata->control_port_protocol) + return 0; + } + +drop_check: + /* 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_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; + struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); + __le16 fc = hdr->frame_control; + + /* + * Pass through unencrypted frames if the hardware has + * decrypted them already. + */ + if (status->flag & RX_FLAG_DECRYPTED) + return 0; + + 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) && + rx->key)) { + 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; + } + /* 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; + } + + 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; +} + +/* + * 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 ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) || + 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); + 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. + */ + 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; + + ieee80211_rx_stats(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->sta->rx_stats.syncp); + rx->sta->rx_stats.msdu[rx->seqno_idx]++; + u64_stats_update_end(&rx->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); + } +} + +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; + 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; + break; + default: + break; + } + + skb->dev = dev; + __skb_queue_head_init(&frame_list); + + if (ieee80211_data_to_8023_exthdr(skb, ðhdr, + rx->sdata->vif.addr, + rx->sdata->vif.type, + data_offset, true)) + return RX_DROP_UNUSABLE; + + ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, + rx->sdata->vif.type, + rx->local->hw.extra_tx_headroom, + check_da, check_sa); + + while (!skb_queue_empty(&frame_list)) { + rx->skb = __skb_dequeue(&frame_list); + + if (!ieee80211_frame_allowed(rx, fc)) { + dev_kfree_skb(rx->skb); + continue; + } + + ieee80211_deliver_skb(rx); + } + + 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; + default: + return RX_DROP_UNUSABLE; + } + } + + if (is_multicast_ether_addr(hdr->addr1)) + 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); +} + +#ifdef CONFIG_MAC80211_MESH +static ieee80211_rx_result +ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) +{ + struct ieee80211_hdr *fwd_hdr, *hdr; + struct ieee80211_tx_info *info; + struct ieee80211s_hdr *mesh_hdr; + struct sk_buff *skb = rx->skb, *fwd_skb; + struct ieee80211_local *local = rx->local; + struct ieee80211_sub_if_data *sdata = rx->sdata; + struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; + u16 ac, q, hdrlen; + int tailroom = 0; + + hdr = (struct ieee80211_hdr *) skb->data; + hdrlen = ieee80211_hdrlen(hdr->frame_control); + + /* make sure fixed part of mesh header is there, also checks skb len */ + if (!pskb_may_pull(rx->skb, hdrlen + 6)) + return RX_DROP_MONITOR; + + mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); + + /* make sure full mesh header is there, also checks skb len */ + if (!pskb_may_pull(rx->skb, + hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr))) + return RX_DROP_MONITOR; + + /* reload pointers */ + hdr = (struct ieee80211_hdr *) skb->data; + mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); + + if (ieee80211_drop_unencrypted(rx, hdr->frame_control)) + return RX_DROP_MONITOR; + + /* frame is in RMC, don't forward */ + if (ieee80211_is_data(hdr->frame_control) && + is_multicast_ether_addr(hdr->addr1) && + mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr)) + return RX_DROP_MONITOR; + + if (!ieee80211_is_data(hdr->frame_control)) + return RX_CONTINUE; + + if (!mesh_hdr->ttl) + return RX_DROP_MONITOR; + + if (mesh_hdr->flags & MESH_FLAGS_AE) { + struct mesh_path *mppath; + char *proxied_addr; + char *mpp_addr; + + if (is_multicast_ether_addr(hdr->addr1)) { + mpp_addr = hdr->addr3; + 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 */ + mpp_addr = hdr->addr4; + 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, mpp_addr); + } else { + spin_lock_bh(&mppath->state_lock); + if (!ether_addr_equal(mppath->mpp, mpp_addr)) + memcpy(mppath->mpp, mpp_addr, ETH_ALEN); + mppath->exp_time = jiffies; + spin_unlock_bh(&mppath->state_lock); + } + rcu_read_unlock(); + } + + /* Frame has reached destination. Don't forward */ + if (!is_multicast_ether_addr(hdr->addr1) && + ether_addr_equal(sdata->vif.addr, hdr->addr3)) + return RX_CONTINUE; + + ac = ieee802_1d_to_ac[skb->priority]; + q = sdata->vif.hw_queue[ac]; + if (ieee80211_queue_stopped(&local->hw, q)) { + IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion); + return RX_DROP_MONITOR; + } + skb_set_queue_mapping(skb, ac); + + if (!--mesh_hdr->ttl) { + if (!is_multicast_ether_addr(hdr->addr1)) + IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, + dropped_frames_ttl); + goto out; + } + + if (!ifmsh->mshcfg.dot11MeshForwarding) + goto out; + + if (sdata->crypto_tx_tailroom_needed_cnt) + tailroom = IEEE80211_ENCRYPT_TAILROOM; + + fwd_skb = skb_copy_expand(skb, local->tx_headroom + + sdata->encrypt_headroom, + tailroom, GFP_ATOMIC); + if (!fwd_skb) + goto out; + + fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; + fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY); + info = IEEE80211_SKB_CB(fwd_skb); + memset(info, 0, sizeof(*info)); + info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; + info->control.vif = &rx->sdata->vif; + info->control.jiffies = jiffies; + if (is_multicast_ether_addr(fwd_hdr->addr1)) { + IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); + memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); + /* 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 */ + mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl, + fwd_hdr->addr3, 0, + WLAN_REASON_MESH_PATH_NOFORWARD, + fwd_hdr->addr2); + IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route); + kfree_skb(fwd_skb); + return RX_DROP_MONITOR; + } + + IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); + ieee80211_add_pending_skb(local, fwd_skb); + out: + if (is_multicast_ether_addr(hdr->addr1)) + return RX_CONTINUE; + return RX_DROP_MONITOR; +} +#endif + +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; + 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; + + 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)) { + skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb); + schedule_work(&local->tdls_chsw_work); + if (rx->sta) + rx->sta->rx_stats.packets++; + + 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->u.mgd.bssid) || + !ether_addr_equal(mgmt->bssid, sdata->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->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 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; + + if (rx->sdata->vif.type == NL80211_IFTYPE_AP && + ieee80211_is_beacon(mgmt->frame_control) && + !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) { + int sig = 0; + + 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 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; + + /* drop too small frames */ + if (len < IEEE80211_MIN_ACTION_SIZE) + return RX_DROP_UNUSABLE; + + 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->sta->sta.ht_cap.ht_supported) + goto invalid; + + if (sdata->vif.type != NL80211_IFTYPE_STATION && + sdata->vif.type != NL80211_IFTYPE_MESH_POINT && + sdata->vif.type != NL80211_IFTYPE_AP_VLAN && + sdata->vif.type != NL80211_IFTYPE_AP && + sdata->vif.type != NL80211_IFTYPE_ADHOC) + break; + + /* 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->sta->sta.smps_mode == smps_mode) + goto handled; + rx->sta->sta.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, + 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->sta->sta.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->sta); + + /* set cur_max_bandwidth and recalc sta bw */ + rx->sta->cur_max_bandwidth = max_bw; + new_bw = ieee80211_sta_cur_vht_bw(rx->sta); + + if (rx->sta->sta.bandwidth == new_bw) + goto handled; + + rx->sta->sta.bandwidth = new_bw; + sband = rx->local->hw.wiphy->bands[status->band]; + sta_opmode.bw = + ieee80211_sta_rx_bw_to_chan_width(rx->sta); + sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED; + + rate_control_rate_update(local, sband, rx->sta, + 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->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->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; + } + + 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->sta->rx_stats.packets++; + dev_kfree_skb(rx->skb); + return RX_QUEUED; + + queue: + skb_queue_tail(&sdata->skb_queue, rx->skb); + ieee80211_queue_work(&local->hw, &sdata->work); + if (rx->sta) + rx->sta->rx_stats.packets++; + 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); + int sig = 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)) + sig = status->signal; + + if (cfg80211_rx_mgmt_khz(&rx->sdata->wdev, + ieee80211_rx_status_to_khz(status), sig, + rx->skb->data, rx->skb->len, 0)) { + if (rx->sta) + rx->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->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, + 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 */ + skb_queue_tail(&sdata->skb_queue, rx->skb); + ieee80211_queue_work(&rx->local->hw, &sdata->work); + if (rx->sta) + rx->sta->rx_stats.packets++; + + 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; + } + + /* queue up frame and kick off work to process it */ + skb_queue_tail(&sdata->skb_queue, rx->skb); + ieee80211_queue_work(&rx->local->hw, &sdata->work); + if (rx->sta) + rx->sta->rx_stats.packets++; + + return RX_QUEUED; +} + +static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, + struct ieee80211_rate *rate) +{ + 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; + + /* vendor data is long removed here */ + status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA; + /* 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; + ieee80211_rx_stats(sdata->dev, skb->len); + } + + if (prev_dev) { + skb->dev = prev_dev; + netif_receive_skb(skb); + return; + } + + out_free_skb: + dev_kfree_skb(skb); +} + +static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, + ieee80211_rx_result res) +{ + switch (res) { + case RX_DROP_MONITOR: + I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); + if (rx->sta) + rx->sta->rx_stats.dropped++; + fallthrough; + case RX_CONTINUE: { + struct ieee80211_rate *rate = NULL; + struct ieee80211_supported_band *sband; + struct ieee80211_rx_status *status; + + status = IEEE80211_SKB_RXCB((rx->skb)); + + sband = rx->local->hw.wiphy->bands[status->band]; + if (status->encoding == RX_ENC_LEGACY) + rate = &sband->bitrates[status->rate_idx]; + + ieee80211_rx_cooked_monitor(rx, rate); + break; + } + case RX_DROP_UNUSABLE: + I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); + if (rx->sta) + rx->sta->rx_stats.dropped++; + dev_kfree_skb(rx->skb); + break; + case RX_QUEUED: + I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); + break; + } +} + +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; + + 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 */ +#ifdef CONFIG_MAC80211_MESH + if (ieee80211_vif_is_mesh(&rx->sdata->vif)) + CALL_RXH(ieee80211_rx_h_mesh_fwding); +#endif + 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 +} + +/* + * 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 = { + .sta = sta, + .sdata = sta->sdata, + .local = sta->local, + /* This is OK -- must be QoS data frame */ + .security_idx = tid, + .seqno_idx = tid, + }; + struct tid_ampdu_rx *tid_agg_rx; + + 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 sta_info *sta; + struct tid_ampdu_rx *tid_agg_rx; + struct sk_buff_head frames; + struct ieee80211_rx_data rx = { + /* This is OK -- must be QoS data frame */ + .security_idx = tid, + .seqno_idx = tid, + }; + int i, diff; + + if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS)) + return; + + __skb_queue_head_init(&frames); + + sta = container_of(pubsta, struct sta_info, sta); + + rx.sta = sta; + rx.sdata = sta->sdata; + rx.local = sta->local; + + rcu_read_lock(); + tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); + if (!tid_agg_rx) + goto out; + + spin_lock_bh(&tid_agg_rx->reorder_lock); + + if (received_mpdus >= IEEE80211_SN_MODULO >> 1) { + int release; + + /* release all frames in the reorder buffer */ + release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) % + IEEE80211_SN_MODULO; + ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, + release, &frames); + /* update ssn to match received ssn */ + tid_agg_rx->head_seq_num = ssn; + } else { + ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn, + &frames); + } + + /* handle the case that received ssn is behind the mac ssn. + * it can be tid_agg_rx->buf_size behind and still be valid */ + diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK; + if (diff >= tid_agg_rx->buf_size) { + tid_agg_rx->reorder_buf_filtered = 0; + goto release; + } + filtered = filtered >> diff; + ssn += diff; + + /* update bitmap */ + for (i = 0; i < tid_agg_rx->buf_size; i++) { + int index = (ssn + i) % tid_agg_rx->buf_size; + + tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); + if (filtered & BIT_ULL(i)) + tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index); + } + + /* now process also frames that the filter marking released */ + ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); + +release: + spin_unlock_bh(&tid_agg_rx->reorder_lock); + + ieee80211_rx_handlers(&rx, &frames); + + out: + rcu_read_unlock(); +} +EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames); + +/* main receive path */ + +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_robust_mgmt_frame(skb) && !rx->sta) + return false; + if (multicast) + return true; + return ether_addr_equal(sdata->vif.addr, hdr->addr1); + 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 ether_addr_equal(sdata->vif.addr, hdr->addr1); + + if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) { + /* + * 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 && + !ether_addr_equal(sdata->vif.addr, hdr->addr1)) + 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_WDS: + if (bssid || !ieee80211_is_data(hdr->frame_control)) + return false; + return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2); + 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; + bool assign = false; + + /* use sparse to check that we don't return without updating */ + __acquire(check_fast_rx); + + BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header)); + BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN); + ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header); + ether_addr_copy(fastrx.vif_addr, sdata->vif.addr); + + 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; + 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); + + 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 bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx, + struct ieee80211_fast_rx *fast_rx) +{ + struct sk_buff *skb = rx->skb; + struct ieee80211_hdr *hdr = (void *)skb->data; + struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); + struct sta_info *sta = rx->sta; + int orig_len = skb->len; + int 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 = &sta->rx_stats; + + if (fast_rx->uses_rss) + stats = this_cpu_ptr(sta->pcpu_rx_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 (!(status->rx_flags & IEEE80211_RX_AMSDU)) { + if (!pskb_may_pull(skb, snap_offs + sizeof(*payload))) + goto drop; + + payload = (void *)(skb->data + snap_offs); + + if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr)) + return false; + + /* Don't handle these here since they require special code. + * Accept AARP and IPX even though they should come with a + * bridge-tunnel header - but if we get them this way then + * there's little point in discarding them. + */ + if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) || + payload->proto == fast_rx->control_port_protocol)) + return false; + } + + /* after this point, don't punt to the slowpath! */ + + if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) && + pskb_trim(skb, skb->len - fast_rx->icv_len)) + goto drop; + + /* 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(&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(&sta->rx_stats_avg.chain_signal[i], + -signal); + } + } + /* end of statistics */ + + 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; + } + + stats->last_rx = jiffies; + stats->last_rate = sta_stats_encode_rate(status); + + stats->fragments++; + stats->packets++; + + /* do the header conversion - first grab the addresses */ + ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs); + ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs); + /* remove the SNAP but leave the ethertype */ + skb_pull(skb, snap_offs + sizeof(rfc1042_header)); + /* push the addresses in front */ + memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs)); + + skb->dev = fast_rx->dev; + + ieee80211_rx_stats(fast_rx->dev, skb->len); + + /* The seqno index has the same property as needed + * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS + * for non-QoS-data frames. Here we know it's a data + * frame, so count MSDUs. + */ + 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(addrs.da)) { + xmit_skb = skb_copy(skb, GFP_ATOMIC); + } else if (!ether_addr_equal(addrs.da, addrs.sa) && + sta_info_get(rx->sdata, addrs.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 true; + } + + /* deliver to local stack */ + skb->protocol = eth_type_trans(skb, fast_rx->dev); + memset(skb->cb, 0, sizeof(skb->cb)); + if (rx->list) + list_add_tail(&skb->list, rx->list); + else + netif_receive_skb(skb); + + return true; + drop: + dev_kfree_skb(skb); + 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; + + 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) { + skb = skb_copy(skb, GFP_ATOMIC); + if (!skb) { + if (net_ratelimit()) + wiphy_debug(local->hw.wiphy, + "failed to copy skb for %s\n", + sdata->name); + return true; + } + + rx->skb = skb; + } + + ieee80211_invoke_rx_handlers(rx); + return true; +} + +/* + * 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_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; + + 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; + + if (pubsta) { + rx.sta = container_of(pubsta, struct sta_info, sta); + rx.sdata = rx.sta->sdata; + if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) + return; + goto out; + } + + prev_sta = NULL; + + for_each_sta_info(local, hdr->addr2, sta, tmp) { + if (!prev_sta) { + prev_sta = sta; + continue; + } + + rx.sta = prev_sta; + rx.sdata = prev_sta->sdata; + ieee80211_prepare_and_rx_handle(&rx, skb, false); + + prev_sta = sta; + } + + if (prev_sta) { + rx.sta = prev_sta; + rx.sdata = prev_sta->sdata; + + 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.sta = sta_info_get_bss(prev, hdr->addr2); + rx.sdata = prev; + ieee80211_prepare_and_rx_handle(&rx, skb, false); + + prev = sdata; + } + + if (prev) { + rx.sta = sta_info_get_bss(prev, hdr->addr2); + rx.sdata = prev; + + if (ieee80211_prepare_and_rx_handle(&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); + + 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; + 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]; + } + } + + status->rx_flags = 0; + + /* + * 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. + */ + skb = ieee80211_rx_monitor(local, skb, rate); + if (!skb) + return; + + ieee80211_tpt_led_trig_rx(local, + ((struct ieee80211_hdr *)skb->data)->frame_control, + skb->len); + + __ieee80211_rx_handle_packet(hw, pubsta, skb, list); + + 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); |