xref: /linux-6.12.1/drivers/staging/rtl8192e/rtllib_rx.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Original code based Host AP (software wireless LAN access point) driver
 * for Intersil Prism2/2.5/3 - hostap.o module, common routines
 *
 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
 * <jkmaline@cc.hut.fi>
 * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
 * Copyright (c) 2004, Intel Corporation
 *
 * Few modifications for Realtek's Wi-Fi drivers by
 * Andrea Merello <andrea.merello@gmail.com>
 *
 * A special thanks goes to Realtek for their support !
 */
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/in6.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/tcp.h>
#include <linux/types.h>
#include <linux/wireless.h>
#include <linux/etherdevice.h>
#include <linux/uaccess.h>
#include <linux/ctype.h>

#include "rtllib.h"

static void rtllib_rx_mgt(struct rtllib_device *ieee, struct sk_buff *skb,
			  struct rtllib_rx_stats *stats);

static inline void rtllib_monitor_rx(struct rtllib_device *ieee,
				     struct sk_buff *skb,
				     struct rtllib_rx_stats *rx_status,
				     size_t hdr_length)
{
	skb->dev = ieee->dev;
	skb_reset_mac_header(skb);
	skb_pull(skb, hdr_length);
	skb->pkt_type = PACKET_OTHERHOST;
	skb->protocol = htons(ETH_P_80211_RAW);
	memset(skb->cb, 0, sizeof(skb->cb));
	netif_rx(skb);
}

/* Called only as a tasklet (software IRQ) */
static struct rtllib_frag_entry *
rtllib_frag_cache_find(struct rtllib_device *ieee, unsigned int seq,
		       unsigned int frag, u8 tid, u8 *src, u8 *dst)
{
	struct rtllib_frag_entry *entry;
	int i;

	for (i = 0; i < RTLLIB_FRAG_CACHE_LEN; i++) {
		entry = &ieee->frag_cache[tid][i];
		if (entry->skb &&
		    time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
			netdev_dbg(ieee->dev,
				   "expiring fragment cache entry seq=%u last_frag=%u\n",
				   entry->seq, entry->last_frag);
			dev_kfree_skb_any(entry->skb);
			entry->skb = NULL;
		}

		if (entry->skb && entry->seq == seq &&
		    (entry->last_frag + 1 == frag || frag == -1) &&
		    memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
		    memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
			return entry;
	}

	return NULL;
}

/* Called only as a tasklet (software IRQ) */
static struct sk_buff *
rtllib_frag_cache_get(struct rtllib_device *ieee,
		      struct ieee80211_hdr *hdr)
{
	struct sk_buff *skb = NULL;
	u16 fc = le16_to_cpu(hdr->frame_control);
	u16 sc = le16_to_cpu(hdr->seq_ctrl);
	unsigned int frag = WLAN_GET_SEQ_FRAG(sc);
	unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
	struct rtllib_frag_entry *entry;
	struct ieee80211_qos_hdr *hdr_3addrqos;
	struct ieee80211_qos_hdr_4addr *hdr_4addrqos;
	u8 tid;

	if (ieee80211_has_a4(hdr->frame_control) &&
	    RTLLIB_QOS_HAS_SEQ(fc)) {
		hdr_4addrqos = (struct ieee80211_qos_hdr_4addr *)hdr;
		tid = le16_to_cpu(hdr_4addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
		tid = UP2AC(tid);
		tid++;
	} else if (RTLLIB_QOS_HAS_SEQ(fc)) {
		hdr_3addrqos = (struct ieee80211_qos_hdr *)hdr;
		tid = le16_to_cpu(hdr_3addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
		tid = UP2AC(tid);
		tid++;
	} else {
		tid = 0;
	}

	if (frag == 0) {
		/* Reserve enough space to fit maximum frame length */
		skb = dev_alloc_skb(ieee->dev->mtu +
				    sizeof(struct ieee80211_hdr) +
				    8 /* LLC */ +
				    2 /* alignment */ +
				    8 /* WEP */ +
				    ETH_ALEN /* WDS */ +
				    /* QOS Control */
				    (RTLLIB_QOS_HAS_SEQ(fc) ? 2 : 0));
		if (!skb)
			return NULL;

		entry = &ieee->frag_cache[tid][ieee->frag_next_idx[tid]];
		ieee->frag_next_idx[tid]++;
		if (ieee->frag_next_idx[tid] >= RTLLIB_FRAG_CACHE_LEN)
			ieee->frag_next_idx[tid] = 0;

		if (entry->skb)
			dev_kfree_skb_any(entry->skb);

		entry->first_frag_time = jiffies;
		entry->seq = seq;
		entry->last_frag = frag;
		entry->skb = skb;
		ether_addr_copy(entry->src_addr, hdr->addr2);
		ether_addr_copy(entry->dst_addr, hdr->addr1);
	} else {
		/* received a fragment of a frame for which the head fragment
		 * should have already been received
		 */
		entry = rtllib_frag_cache_find(ieee, seq, frag, tid, hdr->addr2,
					       hdr->addr1);
		if (entry) {
			entry->last_frag = frag;
			skb = entry->skb;
		}
	}

	return skb;
}

/* Called only as a tasklet (software IRQ) */
static int rtllib_frag_cache_invalidate(struct rtllib_device *ieee,
					struct ieee80211_hdr *hdr)
{
	u16 fc = le16_to_cpu(hdr->frame_control);
	u16 sc = le16_to_cpu(hdr->seq_ctrl);
	unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
	struct rtllib_frag_entry *entry;
	struct ieee80211_qos_hdr *hdr_3addrqos;
	struct ieee80211_qos_hdr_4addr *hdr_4addrqos;
	u8 tid;

	if (ieee80211_has_a4(hdr->frame_control) &&
	    RTLLIB_QOS_HAS_SEQ(fc)) {
		hdr_4addrqos = (struct ieee80211_qos_hdr_4addr *)hdr;
		tid = le16_to_cpu(hdr_4addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
		tid = UP2AC(tid);
		tid++;
	} else if (RTLLIB_QOS_HAS_SEQ(fc)) {
		hdr_3addrqos = (struct ieee80211_qos_hdr *)hdr;
		tid = le16_to_cpu(hdr_3addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
		tid = UP2AC(tid);
		tid++;
	} else {
		tid = 0;
	}

	entry = rtllib_frag_cache_find(ieee, seq, -1, tid, hdr->addr2,
				       hdr->addr1);

	if (!entry) {
		netdev_dbg(ieee->dev,
			   "Couldn't invalidate fragment cache entry (seq=%u)\n",
			   seq);
		return -1;
	}

	entry->skb = NULL;
	return 0;
}

/* rtllib_rx_frame_mgtmt
 *
 * Responsible for handling management control frames
 *
 * Called by rtllib_rx
 */
static inline int
rtllib_rx_frame_mgmt(struct rtllib_device *ieee, struct sk_buff *skb,
		     struct rtllib_rx_stats *rx_stats, u16 type, u16 stype)
{
	/* On the struct stats definition there is written that
	 * this is not mandatory.... but seems that the probe
	 * response parser uses it
	 */
	struct ieee80211_hdr_3addr *hdr = (struct ieee80211_hdr_3addr *)skb->data;

	rx_stats->len = skb->len;
	rtllib_rx_mgt(ieee, skb, rx_stats);
	if ((memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN))) {
		dev_kfree_skb_any(skb);
		return 0;
	}
	rtllib_rx_frame_softmac(ieee, skb, rx_stats, type, stype);

	dev_kfree_skb_any(skb);

	return 0;
}

/* No encapsulation header if EtherType < 0x600 (=length) */

/* Called by rtllib_rx_frame_decrypt */
static int rtllib_is_eapol_frame(struct rtllib_device *ieee,
				 struct sk_buff *skb, size_t hdrlen)
{
	struct net_device *dev = ieee->dev;
	u16 fc, ethertype;
	struct ieee80211_hdr *hdr;
	u8 *pos;

	if (skb->len < 24)
		return 0;

	hdr = (struct ieee80211_hdr *)skb->data;
	fc = le16_to_cpu(hdr->frame_control);

	/* check that the frame is unicast frame to us */
	if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
	    IEEE80211_FCTL_TODS &&
	    memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
	    memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
		/* ToDS frame with own addr BSSID and DA */
	} else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
		   IEEE80211_FCTL_FROMDS &&
		   memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
		/* FromDS frame with own addr as DA */
	} else {
		return 0;
	}

	if (skb->len < 24 + 8)
		return 0;

	/* check for port access entity Ethernet type */
	pos = skb->data + hdrlen;
	ethertype = (pos[6] << 8) | pos[7];
	if (ethertype == ETH_P_PAE)
		return 1;

	return 0;
}

/* Called only as a tasklet (software IRQ), by rtllib_rx */
static inline int
rtllib_rx_frame_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
			struct lib80211_crypt_data *crypt)
{
	struct ieee80211_hdr *hdr;
	int res, hdrlen;

	if (!crypt || !crypt->ops->decrypt_mpdu)
		return 0;

	if (ieee->hwsec_active) {
		struct cb_desc *tcb_desc = (struct cb_desc *)
						(skb->cb + MAX_DEV_ADDR_SIZE);

		tcb_desc->hw_sec = 1;

		if (ieee->need_sw_enc)
			tcb_desc->hw_sec = 0;
	}

	hdr = (struct ieee80211_hdr *)skb->data;
	hdrlen = rtllib_get_hdrlen(le16_to_cpu(hdr->frame_control));

	atomic_inc(&crypt->refcnt);
	res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
	atomic_dec(&crypt->refcnt);
	if (res < 0) {
		netdev_dbg(ieee->dev, "decryption failed (SA= %pM) res=%d\n",
			   hdr->addr2, res);
		if (res == -2)
			netdev_dbg(ieee->dev,
				   "Decryption failed ICV mismatch (key %d)\n",
				   skb->data[hdrlen + 3] >> 6);
		return -1;
	}

	return res;
}

/* Called only as a tasklet (software IRQ), by rtllib_rx */
static inline int
rtllib_rx_frame_decrypt_msdu(struct rtllib_device *ieee, struct sk_buff *skb,
			     int keyidx, struct lib80211_crypt_data *crypt)
{
	struct ieee80211_hdr *hdr;
	int res, hdrlen;

	if (!crypt || !crypt->ops->decrypt_msdu)
		return 0;
	if (ieee->hwsec_active) {
		struct cb_desc *tcb_desc = (struct cb_desc *)
						(skb->cb + MAX_DEV_ADDR_SIZE);

		tcb_desc->hw_sec = 1;

		if (ieee->need_sw_enc)
			tcb_desc->hw_sec = 0;
	}

	hdr = (struct ieee80211_hdr *)skb->data;
	hdrlen = rtllib_get_hdrlen(le16_to_cpu(hdr->frame_control));

	atomic_inc(&crypt->refcnt);
	res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
	atomic_dec(&crypt->refcnt);
	if (res < 0) {
		netdev_dbg(ieee->dev,
			   "MSDU decryption/MIC verification failed (SA= %pM keyidx=%d)\n",
			   hdr->addr2, keyidx);
		return -1;
	}

	return 0;
}

/* this function is stolen from ipw2200 driver*/
#define IEEE_PACKET_RETRY_TIME (5 * HZ)
static int is_duplicate_packet(struct rtllib_device *ieee,
			       struct ieee80211_hdr *header)
{
	u16 fc = le16_to_cpu(header->frame_control);
	u16 sc = le16_to_cpu(header->seq_ctrl);
	u16 seq = WLAN_GET_SEQ_SEQ(sc);
	u16 frag = WLAN_GET_SEQ_FRAG(sc);
	u16 *last_seq, *last_frag;
	unsigned long *last_time;
	struct ieee80211_qos_hdr *hdr_3addrqos;
	struct ieee80211_qos_hdr_4addr *hdr_4addrqos;
	u8 tid;

	if (ieee80211_has_a4(header->frame_control) &&
	    RTLLIB_QOS_HAS_SEQ(fc)) {
		hdr_4addrqos = (struct ieee80211_qos_hdr_4addr *)header;
		tid = le16_to_cpu(hdr_4addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
		tid = UP2AC(tid);
		tid++;
	} else if (RTLLIB_QOS_HAS_SEQ(fc)) {
		hdr_3addrqos = (struct ieee80211_qos_hdr *)header;
		tid = le16_to_cpu(hdr_3addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
		tid = UP2AC(tid);
		tid++;
	} else {
		tid = 0;
	}

	switch (ieee->iw_mode) {
	case IW_MODE_INFRA:
		last_seq = &ieee->last_rxseq_num[tid];
		last_frag = &ieee->last_rxfrag_num[tid];
		last_time = &ieee->last_packet_time[tid];
		break;
	default:
		return 0;
	}

	if ((*last_seq == seq) &&
	    time_after(*last_time + IEEE_PACKET_RETRY_TIME, jiffies)) {
		if (*last_frag == frag)
			goto drop;
		if (*last_frag + 1 != frag)
			/* out-of-order fragment */
			goto drop;
	} else {
		*last_seq = seq;
	}

	*last_frag = frag;
	*last_time = jiffies;
	return 0;

drop:

	return 1;
}

static bool add_reorder_entry(struct rx_ts_record *ts,
			      struct rx_reorder_entry *reorder_entry)
{
	struct list_head *list = &ts->rx_pending_pkt_list;

	while (list->next != &ts->rx_pending_pkt_list) {
		if (SN_LESS(reorder_entry->seq_num, ((struct rx_reorder_entry *)
		    list_entry(list->next, struct rx_reorder_entry,
		    list))->seq_num))
			list = list->next;
		else if (SN_EQUAL(reorder_entry->seq_num,
			((struct rx_reorder_entry *)list_entry(list->next,
			struct rx_reorder_entry, list))->seq_num))
			return false;
		else
			break;
	}
	reorder_entry->list.next = list->next;
	reorder_entry->list.next->prev = &reorder_entry->list;
	reorder_entry->list.prev = list;
	list->next = &reorder_entry->list;

	return true;
}

void rtllib_indicate_packets(struct rtllib_device *ieee,
			     struct rtllib_rxb **prxb_indicate_array, u8 index)
{
	struct net_device_stats *stats = &ieee->stats;
	u8 i = 0, j = 0;
	u16 ethertype;

	for (j = 0; j < index; j++) {
		struct rtllib_rxb *prxb = prxb_indicate_array[j];

		for (i = 0; i < prxb->nr_subframes; i++) {
			struct sk_buff *sub_skb = prxb->subframes[i];

		/* convert hdr + possible LLC headers into Ethernet header */
			ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
			if (sub_skb->len >= 8 &&
			    ((memcmp(sub_skb->data, rfc1042_header,
				     SNAP_SIZE) == 0 &&
			      ethertype != ETH_P_AARP &&
			      ethertype != ETH_P_IPX) ||
			    memcmp(sub_skb->data, bridge_tunnel_header,
				   SNAP_SIZE) == 0)) {
				/* remove RFC1042 or Bridge-Tunnel encapsulation
				 * and replace EtherType
				 */
				skb_pull(sub_skb, SNAP_SIZE);
				memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
				memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
			} else {
				u16 len;
			/* Leave Ethernet header part of hdr and full payload */
				len = sub_skb->len;
				memcpy(skb_push(sub_skb, 2), &len, 2);
				memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
				memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
			}

			/* Indicate the packets to upper layer */
			if (sub_skb) {
				stats->rx_packets++;
				stats->rx_bytes += sub_skb->len;

				memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
				sub_skb->protocol = eth_type_trans(sub_skb,
								   ieee->dev);
				sub_skb->dev = ieee->dev;
				sub_skb->dev->stats.rx_packets++;
				sub_skb->dev->stats.rx_bytes += sub_skb->len;
				/* 802.11 crc not sufficient */
				sub_skb->ip_summed = CHECKSUM_NONE;
				ieee->last_rx_ps_time = jiffies;
				netif_rx(sub_skb);
			}
		}
		kfree(prxb);
		prxb = NULL;
	}
}

void rtllib_flush_rx_ts_pending_pkts(struct rtllib_device *ieee,
				     struct rx_ts_record *ts)
{
	struct rx_reorder_entry *pRxReorderEntry;
	u8 rfd_cnt = 0;

	del_timer_sync(&ts->rx_pkt_pending_timer);
	while (!list_empty(&ts->rx_pending_pkt_list)) {
		if (rfd_cnt >= REORDER_WIN_SIZE) {
			netdev_info(ieee->dev,
				    "-------------->%s() error! rfd_cnt >= REORDER_WIN_SIZE\n",
				    __func__);
			break;
		}

		pRxReorderEntry = (struct rx_reorder_entry *)
				  list_entry(ts->rx_pending_pkt_list.prev,
					     struct rx_reorder_entry, list);
		netdev_dbg(ieee->dev, "%s(): Indicate seq_num %d!\n", __func__,
			   pRxReorderEntry->seq_num);
		list_del_init(&pRxReorderEntry->list);

		ieee->rfd_array[rfd_cnt] = pRxReorderEntry->prxb;

		rfd_cnt = rfd_cnt + 1;
		list_add_tail(&pRxReorderEntry->list,
			      &ieee->RxReorder_Unused_List);
	}
	rtllib_indicate_packets(ieee, ieee->rfd_array, rfd_cnt);

	ts->rx_indicate_seq = 0xffff;
}

static void rx_reorder_indicate_packet(struct rtllib_device *ieee,
				       struct rtllib_rxb *prxb,
				       struct rx_ts_record *ts, u16 seq_num)
{
	struct rt_hi_throughput *ht_info = ieee->ht_info;
	struct rx_reorder_entry *reorder_entry = NULL;
	u8 win_size = ht_info->rx_reorder_win_size;
	u16 win_end = 0;
	u8 index = 0;
	bool match_win_start = false, pkt_in_buf = false;
	unsigned long flags;

	netdev_dbg(ieee->dev,
		   "%s(): Seq is %d, ts->rx_indicate_seq is %d, win_size is %d\n",
		   __func__, seq_num, ts->rx_indicate_seq, win_size);

	spin_lock_irqsave(&(ieee->reorder_spinlock), flags);

	win_end = (ts->rx_indicate_seq + win_size - 1) % 4096;
	/* Rx Reorder initialize condition.*/
	if (ts->rx_indicate_seq == 0xffff)
		ts->rx_indicate_seq = seq_num;

	/* Drop out the packet which seq_num is smaller than WinStart */
	if (SN_LESS(seq_num, ts->rx_indicate_seq)) {
		netdev_dbg(ieee->dev,
			   "Packet Drop! IndicateSeq: %d, NewSeq: %d\n",
			   ts->rx_indicate_seq, seq_num);
		ht_info->rx_reorder_drop_counter++;
		{
			int i;

			for (i = 0; i < prxb->nr_subframes; i++)
				dev_kfree_skb(prxb->subframes[i]);
			kfree(prxb);
			prxb = NULL;
		}
		spin_unlock_irqrestore(&(ieee->reorder_spinlock), flags);
		return;
	}

	/* Sliding window manipulation. Conditions includes:
	 * 1. Incoming seq_num is equal to WinStart =>Window shift 1
	 * 2. Incoming seq_num is larger than the win_end => Window shift N
	 */
	if (SN_EQUAL(seq_num, ts->rx_indicate_seq)) {
		ts->rx_indicate_seq = (ts->rx_indicate_seq + 1) % 4096;
		match_win_start = true;
	} else if (SN_LESS(win_end, seq_num)) {
		if (seq_num >= (win_size - 1))
			ts->rx_indicate_seq = seq_num + 1 - win_size;
		else
			ts->rx_indicate_seq = 4095 -
					     (win_size - (seq_num + 1)) + 1;
		netdev_dbg(ieee->dev,
			   "Window Shift! IndicateSeq: %d, NewSeq: %d\n",
			   ts->rx_indicate_seq, seq_num);
	}

	/* Indication process.
	 * After Packet dropping and Sliding Window shifting as above, we can
	 * now just indicate the packets with the seq_num smaller than latest
	 * WinStart and struct buffer other packets.
	 *
	 * For Rx Reorder condition:
	 * 1. All packets with seq_num smaller than WinStart => Indicate
	 * 2. All packets with seq_num larger than or equal to
	 *	 WinStart => Buffer it.
	 */
	if (match_win_start) {
		/* Current packet is going to be indicated.*/
		netdev_dbg(ieee->dev,
			   "Packets indication! IndicateSeq: %d, NewSeq: %d\n",
			   ts->rx_indicate_seq, seq_num);
		ieee->prxb_indicate_array[0] = prxb;
		index = 1;
	} else {
		/* Current packet is going to be inserted into pending list.*/
		if (!list_empty(&ieee->RxReorder_Unused_List)) {
			reorder_entry = (struct rx_reorder_entry *)
					list_entry(ieee->RxReorder_Unused_List.next,
					struct rx_reorder_entry, list);
			list_del_init(&reorder_entry->list);

			/* Make a reorder entry and insert
			 * into a the packet list.
			 */
			reorder_entry->seq_num = seq_num;
			reorder_entry->prxb = prxb;

			if (!add_reorder_entry(ts, reorder_entry)) {
				int i;

				netdev_dbg(ieee->dev,
					   "%s(): Duplicate packet is dropped. IndicateSeq: %d, NewSeq: %d\n",
					   __func__, ts->rx_indicate_seq,
					   seq_num);
				list_add_tail(&reorder_entry->list,
					      &ieee->RxReorder_Unused_List);

				for (i = 0; i < prxb->nr_subframes; i++)
					dev_kfree_skb(prxb->subframes[i]);
				kfree(prxb);
				prxb = NULL;
			} else {
				netdev_dbg(ieee->dev,
					   "Pkt insert into struct buffer. IndicateSeq: %d, NewSeq: %d\n",
					   ts->rx_indicate_seq, seq_num);
			}
		} else {
			/* Packets are dropped if there are not enough reorder
			 * entries. This part should be modified!! We can just
			 * indicate all the packets in struct buffer and get
			 * reorder entries.
			 */
			netdev_err(ieee->dev,
				   "%s(): There is no reorder entry! Packet is dropped!\n",
				   __func__);
			{
				int i;

				for (i = 0; i < prxb->nr_subframes; i++)
					dev_kfree_skb(prxb->subframes[i]);
				kfree(prxb);
				prxb = NULL;
			}
		}
	}

	/* Check if there is any packet need indicate.*/
	while (!list_empty(&ts->rx_pending_pkt_list)) {
		netdev_dbg(ieee->dev, "%s(): start RREORDER indicate\n",
			   __func__);

		reorder_entry = (struct rx_reorder_entry *)
					list_entry(ts->rx_pending_pkt_list.prev,
						   struct rx_reorder_entry,
						   list);
		if (SN_LESS(reorder_entry->seq_num, ts->rx_indicate_seq) ||
		    SN_EQUAL(reorder_entry->seq_num, ts->rx_indicate_seq)) {
			/* This protect struct buffer from overflow. */
			if (index >= REORDER_WIN_SIZE) {
				netdev_err(ieee->dev,
					   "%s(): Buffer overflow!\n",
					   __func__);
				pkt_in_buf = true;
				break;
			}

			list_del_init(&reorder_entry->list);

			if (SN_EQUAL(reorder_entry->seq_num, ts->rx_indicate_seq))
				ts->rx_indicate_seq = (ts->rx_indicate_seq + 1) %
						     4096;

			ieee->prxb_indicate_array[index] = reorder_entry->prxb;
			netdev_dbg(ieee->dev, "%s(): Indicate seq_num %d!\n",
				   __func__, reorder_entry->seq_num);
			index++;

			list_add_tail(&reorder_entry->list,
				      &ieee->RxReorder_Unused_List);
		} else {
			pkt_in_buf = true;
			break;
		}
	}

	/* Handling pending timer. Set this timer to prevent from long time
	 * Rx buffering.
	 */
	if (index > 0) {
		spin_unlock_irqrestore(&ieee->reorder_spinlock, flags);
		if (timer_pending(&ts->rx_pkt_pending_timer))
			del_timer_sync(&ts->rx_pkt_pending_timer);
		spin_lock_irqsave(&ieee->reorder_spinlock, flags);
		ts->rx_timeout_indicate_seq = 0xffff;

		if (index > REORDER_WIN_SIZE) {
			netdev_err(ieee->dev,
				   "%s(): Rx Reorder struct buffer full!\n",
				   __func__);
			spin_unlock_irqrestore(&(ieee->reorder_spinlock),
					       flags);
			return;
		}
		rtllib_indicate_packets(ieee, ieee->prxb_indicate_array, index);
		pkt_in_buf = false;
	}

	if (pkt_in_buf && ts->rx_timeout_indicate_seq == 0xffff) {
		netdev_dbg(ieee->dev, "%s(): SET rx timeout timer\n", __func__);
		ts->rx_timeout_indicate_seq = ts->rx_indicate_seq;
		spin_unlock_irqrestore(&ieee->reorder_spinlock, flags);
		mod_timer(&ts->rx_pkt_pending_timer, jiffies +
			  msecs_to_jiffies(ht_info->rx_reorder_pending_time));
		spin_lock_irqsave(&ieee->reorder_spinlock, flags);
	}
	spin_unlock_irqrestore(&(ieee->reorder_spinlock), flags);
}

static u8 parse_subframe(struct rtllib_device *ieee, struct sk_buff *skb,
			 struct rtllib_rx_stats *rx_stats,
			 struct rtllib_rxb *rxb, u8 *src, u8 *dst)
{
	struct ieee80211_hdr_3addr  *hdr = (struct ieee80211_hdr_3addr *)skb->data;
	u16		fc = le16_to_cpu(hdr->frame_control);

	u16		llc_offset = sizeof(struct ieee80211_hdr_3addr);
	bool		is_aggregate_frame = false;
	u16		subframe_len;
	u8		pad_len = 0;
	u16		seq_num = 0;
	struct sk_buff *sub_skb;
	/* just for debug purpose */
	seq_num = WLAN_GET_SEQ_SEQ(le16_to_cpu(hdr->seq_ctrl));
	if ((RTLLIB_QOS_HAS_SEQ(fc)) &&
	   (((union frameqos *)(skb->data + RTLLIB_3ADDR_LEN))->field.reserved))
		is_aggregate_frame = true;

	if (RTLLIB_QOS_HAS_SEQ(fc))
		llc_offset += 2;
	if (rx_stats->contain_htc)
		llc_offset += sHTCLng;

	if (skb->len <= llc_offset)
		return 0;

	skb_pull(skb, llc_offset);
	ieee->is_aggregate_frame = is_aggregate_frame;
	if (!is_aggregate_frame) {
		rxb->nr_subframes = 1;

		/* altered by clark 3/30/2010
		 * The struct buffer size of the skb indicated to upper layer
		 * must be less than 5000, or the defraged IP datagram
		 * in the IP layer will exceed "ipfrag_high_tresh" and be
		 * discarded. so there must not use the function
		 * "skb_copy" and "skb_clone" for "skb".
		 */

		/* Allocate new skb for releasing to upper layer */
		sub_skb = dev_alloc_skb(RTLLIB_SKBBUFFER_SIZE);
		if (!sub_skb)
			return 0;
		skb_reserve(sub_skb, 12);
		skb_put_data(sub_skb, skb->data, skb->len);
		sub_skb->dev = ieee->dev;

		rxb->subframes[0] = sub_skb;

		memcpy(rxb->src, src, ETH_ALEN);
		memcpy(rxb->dst, dst, ETH_ALEN);
		rxb->subframes[0]->dev = ieee->dev;
		return 1;
	}

	rxb->nr_subframes = 0;
	memcpy(rxb->src, src, ETH_ALEN);
	memcpy(rxb->dst, dst, ETH_ALEN);
	while (skb->len > ETHERNET_HEADER_SIZE) {
		/* Offset 12 denote 2 mac address */
		subframe_len = *((u16 *)(skb->data + 12));
		subframe_len = (subframe_len >> 8) +
				   (subframe_len << 8);

		if (skb->len < (ETHERNET_HEADER_SIZE + subframe_len)) {
			netdev_info(ieee->dev,
				    "%s: A-MSDU parse error!! pRfd->nTotalSubframe : %d\n",
				    __func__, rxb->nr_subframes);
			netdev_info(ieee->dev,
				    "%s: A-MSDU parse error!! Subframe Length: %d\n",
				    __func__, subframe_len);
			netdev_info(ieee->dev,
				    "nRemain_Length is %d and subframe_len is : %d\n",
				    skb->len, subframe_len);
			netdev_info(ieee->dev,
				    "The Packet seq_num is %d\n",
				    seq_num);
			return 0;
		}

		/* move the data point to data content */
		skb_pull(skb, ETHERNET_HEADER_SIZE);

		/* altered by clark 3/30/2010
		 * The struct buffer size of the skb indicated to upper layer
		 * must be less than 5000, or the defraged IP datagram
		 * in the IP layer will exceed "ipfrag_high_tresh" and be
		 * discarded. so there must not use the function
		 * "skb_copy" and "skb_clone" for "skb".
		 */

		/* Allocate new skb for releasing to upper layer */
		sub_skb = dev_alloc_skb(subframe_len + 12);
		if (!sub_skb)
			return 0;
		skb_reserve(sub_skb, 12);
		skb_put_data(sub_skb, skb->data, subframe_len);

		sub_skb->dev = ieee->dev;
		rxb->subframes[rxb->nr_subframes++] = sub_skb;
		if (rxb->nr_subframes >= MAX_SUBFRAME_COUNT) {
			netdev_dbg(ieee->dev,
				   "ParseSubframe(): Too many Subframes! Packets dropped!\n");
			break;
		}
		skb_pull(skb, subframe_len);

		if (skb->len != 0) {
			pad_len = 4 - ((subframe_len +
					  ETHERNET_HEADER_SIZE) % 4);
			if (pad_len == 4)
				pad_len = 0;

			if (skb->len < pad_len)
				return 0;

			skb_pull(skb, pad_len);
		}
	}

	return rxb->nr_subframes;
}

static size_t rtllib_rx_get_hdrlen(struct rtllib_device *ieee,
				   struct sk_buff *skb,
				   struct rtllib_rx_stats *rx_stats)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	u16 fc = le16_to_cpu(hdr->frame_control);
	size_t hdrlen;

	hdrlen = rtllib_get_hdrlen(fc);
	if (ht_c_check(ieee, skb->data)) {
		if (net_ratelimit())
			netdev_info(ieee->dev, "%s: find HTCControl!\n",
				    __func__);
		hdrlen += 4;
		rx_stats->contain_htc = true;
	}

	return hdrlen;
}

static int rtllib_rx_check_duplicate(struct rtllib_device *ieee,
				     struct sk_buff *skb, u8 multicast)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	u16 fc, sc;
	u8 frag;

	fc = le16_to_cpu(hdr->frame_control);
	sc = le16_to_cpu(hdr->seq_ctrl);
	frag = WLAN_GET_SEQ_FRAG(sc);

	if (!ieee->ht_info->cur_rx_reorder_enable ||
		!ieee->current_network.qos_data.active ||
		!is_data_frame(skb->data) ||
		is_legacy_data_frame(skb->data)) {
		if (!ieee80211_is_beacon(hdr->frame_control)) {
			if (is_duplicate_packet(ieee, hdr))
				return -1;
		}
	} else {
		struct rx_ts_record *ts = NULL;

		if (rtllib_get_ts(ieee, (struct ts_common_info **)&ts, hdr->addr2,
			(u8)frame_qos_tid((u8 *)(skb->data)), RX_DIR, true)) {
			if ((fc & (1 << 11)) && (frag == ts->rx_last_frag_num) &&
			    (WLAN_GET_SEQ_SEQ(sc) == ts->rx_last_seq_num))
				return -1;
			ts->rx_last_frag_num = frag;
			ts->rx_last_seq_num = WLAN_GET_SEQ_SEQ(sc);
		} else {
			netdev_warn(ieee->dev, "%s(): No TS! Skip the check!\n",
				    __func__);
			return -1;
		}
	}

	return 0;
}

static void rtllib_rx_extract_addr(struct rtllib_device *ieee,
				   struct ieee80211_hdr *hdr, u8 *dst,
				   u8 *src, u8 *bssid)
{
	u16 fc = le16_to_cpu(hdr->frame_control);

	switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
	case IEEE80211_FCTL_FROMDS:
		ether_addr_copy(dst, hdr->addr1);
		ether_addr_copy(src, hdr->addr3);
		ether_addr_copy(bssid, hdr->addr2);
		break;
	case IEEE80211_FCTL_TODS:
		ether_addr_copy(dst, hdr->addr3);
		ether_addr_copy(src, hdr->addr2);
		ether_addr_copy(bssid, hdr->addr1);
		break;
	case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
		ether_addr_copy(dst, hdr->addr3);
		ether_addr_copy(src, hdr->addr4);
		ether_addr_copy(bssid, ieee->current_network.bssid);
		break;
	default:
		ether_addr_copy(dst, hdr->addr1);
		ether_addr_copy(src, hdr->addr2);
		ether_addr_copy(bssid, hdr->addr3);
		break;
	}
}

static int rtllib_rx_data_filter(struct rtllib_device *ieee, struct ieee80211_hdr *hdr,
				 u8 *dst, u8 *src, u8 *bssid, u8 *addr2)
{
	u16 fc = le16_to_cpu(hdr->frame_control);
	u8 type = WLAN_FC_GET_TYPE(fc);
	u8 stype = WLAN_FC_GET_STYPE(fc);

	/* Filter frames from different BSS */
	if (ieee80211_has_a4(hdr->frame_control) &&
	    !ether_addr_equal(ieee->current_network.bssid, bssid) &&
	    !is_zero_ether_addr(ieee->current_network.bssid)) {
		return -1;
	}

	/* Nullfunc frames may have PS-bit set, so they must be passed to
	 * hostap_handle_sta_rx() before being dropped here.
	 */
	if (stype != IEEE80211_STYPE_DATA &&
	    stype != IEEE80211_STYPE_DATA_CFACK &&
	    stype != IEEE80211_STYPE_DATA_CFPOLL &&
	    stype != IEEE80211_STYPE_DATA_CFACKPOLL &&
	    stype != IEEE80211_STYPE_QOS_DATA) {
		if (stype != IEEE80211_STYPE_NULLFUNC)
			netdev_dbg(ieee->dev,
				   "RX: dropped data frame with no data (type=0x%02x, subtype=0x%02x)\n",
				   type, stype);
		return -1;
	}

	/* packets from our adapter are dropped (echo) */
	if (!memcmp(src, ieee->dev->dev_addr, ETH_ALEN))
		return -1;

	/* {broad,multi}cast packets to our BSS go through */
	if (is_multicast_ether_addr(dst)) {
		if (memcmp(bssid, ieee->current_network.bssid,
			   ETH_ALEN))
			return -1;
	}
	return 0;
}

static int rtllib_rx_get_crypt(struct rtllib_device *ieee, struct sk_buff *skb,
			struct lib80211_crypt_data **crypt, size_t hdrlen)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	u16 fc = le16_to_cpu(hdr->frame_control);
	int idx = 0;

	if (skb->len >= hdrlen + 3)
		idx = skb->data[hdrlen + 3] >> 6;

	*crypt = ieee->crypt_info.crypt[idx];
	/* allow NULL decrypt to indicate an station specific override
	 * for default encryption
	 */
	if (*crypt && (!(*crypt)->ops || !(*crypt)->ops->decrypt_mpdu))
		*crypt = NULL;

	if (!*crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
		/* This seems to be triggered by some (multicast?)
		 * frames from other than current BSS, so just drop the
		 * frames silently instead of filling system log with
		 * these reports.
		 */
		netdev_dbg(ieee->dev,
			   "Decryption failed (not set) (SA= %pM)\n",
			   hdr->addr2);
		return -1;
	}

	return 0;
}

static int rtllib_rx_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
		      struct rtllib_rx_stats *rx_stats,
		      struct lib80211_crypt_data *crypt, size_t hdrlen)
{
	struct ieee80211_hdr *hdr;
	int keyidx = 0;
	u16 fc, sc;
	u8 frag;

	hdr = (struct ieee80211_hdr *)skb->data;
	fc = le16_to_cpu(hdr->frame_control);
	sc = le16_to_cpu(hdr->seq_ctrl);
	frag = WLAN_GET_SEQ_FRAG(sc);

	if ((!rx_stats->decrypted))
		ieee->need_sw_enc = 1;
	else
		ieee->need_sw_enc = 0;

	keyidx = rtllib_rx_frame_decrypt(ieee, skb, crypt);
	if ((fc & IEEE80211_FCTL_PROTECTED) && (keyidx < 0)) {
		netdev_info(ieee->dev, "%s: decrypt frame error\n", __func__);
		return -1;
	}

	hdr = (struct ieee80211_hdr *)skb->data;
	if ((frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
		int flen;
		struct sk_buff *frag_skb = rtllib_frag_cache_get(ieee, hdr);

		netdev_dbg(ieee->dev, "Rx Fragment received (%u)\n", frag);

		if (!frag_skb) {
			netdev_dbg(ieee->dev,
				   "Rx cannot get skb from fragment cache (morefrag=%d seq=%u frag=%u)\n",
				   (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
				   WLAN_GET_SEQ_SEQ(sc), frag);
			return -1;
		}
		flen = skb->len;
		if (frag != 0)
			flen -= hdrlen;

		if (frag_skb->tail + flen > frag_skb->end) {
			netdev_warn(ieee->dev,
				    "%s: host decrypted and reassembled frame did not fit skb\n",
				    __func__);
			rtllib_frag_cache_invalidate(ieee, hdr);
			return -1;
		}

		if (frag == 0) {
			/* copy first fragment (including full headers) into
			 * beginning of the fragment cache skb
			 */
			skb_put_data(frag_skb, skb->data, flen);
		} else {
			/* append frame payload to the end of the fragment
			 * cache skb
			 */
			skb_put_data(frag_skb, skb->data + hdrlen, flen);
		}
		dev_kfree_skb_any(skb);
		skb = NULL;

		if (fc & IEEE80211_FCTL_MOREFRAGS) {
			/* more fragments expected - leave the skb in fragment
			 * cache for now; it will be delivered to upper layers
			 * after all fragments have been received
			 */
			return -2;
		}

		/* this was the last fragment and the frame will be
		 * delivered, so remove skb from fragment cache
		 */
		skb = frag_skb;
		hdr = (struct ieee80211_hdr *)skb->data;
		rtllib_frag_cache_invalidate(ieee, hdr);
	}

	/* skb: hdr + (possible reassembled) full MSDU payload; possibly still
	 * encrypted/authenticated
	 */
	if ((fc & IEEE80211_FCTL_PROTECTED) &&
		rtllib_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt)) {
		netdev_info(ieee->dev, "%s: ==>decrypt msdu error\n", __func__);
		return -1;
	}

	hdr = (struct ieee80211_hdr *)skb->data;
	if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
		if (/*ieee->ieee802_1x &&*/
		    rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
			/* pass unencrypted EAPOL frames even if encryption is
			 * configured
			 */
			struct eapol *eap = (struct eapol *)(skb->data +
				24);
			netdev_dbg(ieee->dev,
				   "RX: IEEE 802.1X EAPOL frame: %s\n",
				   eap_get_type(eap->type));
		} else {
			netdev_dbg(ieee->dev,
				   "encryption configured, but RX frame not encrypted (SA= %pM)\n",
				   hdr->addr2);
			return -1;
		}
	}

	if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) &&
	    rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
		struct eapol *eap = (struct eapol *)(skb->data + 24);

		netdev_dbg(ieee->dev, "RX: IEEE 802.1X EAPOL frame: %s\n",
			   eap_get_type(eap->type));
	}

	if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
	    !rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
		netdev_dbg(ieee->dev,
			   "dropped unencrypted RX data frame from %pM (drop_unencrypted=1)\n",
			   hdr->addr2);
		return -1;
	}

	return 0;
}

static void rtllib_rx_check_leave_lps(struct rtllib_device *ieee, u8 unicast,
				      u8 nr_subframes)
{
	if (unicast) {
		if (ieee->link_state == MAC80211_LINKED) {
			if (((ieee->link_detect_info.num_rx_unicast_ok_in_period +
			    ieee->link_detect_info.num_tx_ok_in_period) > 8) ||
			    (ieee->link_detect_info.num_rx_unicast_ok_in_period > 2)) {
				ieee->leisure_ps_leave(ieee->dev);
			}
		}
	}
	ieee->last_rx_ps_time = jiffies;
}

static void rtllib_rx_indicate_pkt_legacy(struct rtllib_device *ieee,
		struct rtllib_rx_stats *rx_stats,
		struct rtllib_rxb *rxb,
		u8 *dst,
		u8 *src)
{
	struct net_device *dev = ieee->dev;
	u16 ethertype;
	int i = 0;

	if (!rxb) {
		netdev_info(dev, "%s: rxb is NULL!!\n", __func__);
		return;
	}

	for (i = 0; i < rxb->nr_subframes; i++) {
		struct sk_buff *sub_skb = rxb->subframes[i];

		if (sub_skb) {
			/* convert hdr + possible LLC headers
			 * into Ethernet header
			 */
			ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
			if (sub_skb->len >= 8 &&
				((memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) == 0 &&
				ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
				memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE) == 0)) {
				/* remove RFC1042 or Bridge-Tunnel encapsulation
				 * and replace EtherType
				 */
				skb_pull(sub_skb, SNAP_SIZE);
				ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
						src);
				ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
						dst);
			} else {
				u16 len;
				/* Leave Ethernet header part of hdr
				 * and full payload
				 */
				len = sub_skb->len;
				memcpy(skb_push(sub_skb, 2), &len, 2);
				ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
						src);
				ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
						dst);
			}

			ieee->stats.rx_packets++;
			ieee->stats.rx_bytes += sub_skb->len;

			if (is_multicast_ether_addr(dst))
				ieee->stats.multicast++;

			/* Indicate the packets to upper layer */
			memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
			sub_skb->protocol = eth_type_trans(sub_skb, dev);
			sub_skb->dev = dev;
			sub_skb->dev->stats.rx_packets++;
			sub_skb->dev->stats.rx_bytes += sub_skb->len;
			/* 802.11 crc not sufficient */
			sub_skb->ip_summed = CHECKSUM_NONE;
			netif_rx(sub_skb);
		}
	}
	kfree(rxb);
}

static int rtllib_rx_infra_adhoc(struct rtllib_device *ieee, struct sk_buff *skb,
		 struct rtllib_rx_stats *rx_stats)
{
	struct net_device *dev = ieee->dev;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	struct lib80211_crypt_data *crypt = NULL;
	struct rtllib_rxb *rxb = NULL;
	struct rx_ts_record *ts = NULL;
	u16 fc, sc, seq_num = 0;
	u8 type, stype, multicast = 0, unicast = 0, nr_subframes = 0, TID = 0;
	u8 dst[ETH_ALEN];
	u8 src[ETH_ALEN];
	u8 bssid[ETH_ALEN] = {0};

	size_t hdrlen = 0;
	int ret = 0, i = 0;

	fc = le16_to_cpu(hdr->frame_control);
	type = WLAN_FC_GET_TYPE(fc);
	stype = WLAN_FC_GET_STYPE(fc);
	sc = le16_to_cpu(hdr->seq_ctrl);

	/*Filter pkt not to me*/
	multicast = is_multicast_ether_addr(hdr->addr1);
	unicast = !multicast;
	if (unicast && !ether_addr_equal(dev->dev_addr, hdr->addr1))
		goto rx_dropped;

	/*Filter pkt has too small length */
	hdrlen = rtllib_rx_get_hdrlen(ieee, skb, rx_stats);
	if (skb->len < hdrlen) {
		netdev_info(dev,
			    "%s():ERR!!! skb->len is smaller than hdrlen\n",
			    __func__);
		goto rx_dropped;
	}

	/* Filter Duplicate pkt */
	ret = rtllib_rx_check_duplicate(ieee, skb, multicast);
	if (ret < 0)
		goto rx_dropped;

	/* Filter CTRL Frame */
	if (type == RTLLIB_FTYPE_CTL)
		goto rx_dropped;

	/* Filter MGNT Frame */
	if (type == RTLLIB_FTYPE_MGMT) {
		if (rtllib_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
			goto rx_dropped;
		else
			goto rx_exit;
	}

	/* Filter WAPI DATA Frame */

	/* Update statstics for AP roaming */
	ieee->link_detect_info.num_recv_data_in_period++;
	ieee->link_detect_info.num_rx_ok_in_period++;

	/* Data frame - extract src/dst addresses */
	rtllib_rx_extract_addr(ieee, hdr, dst, src, bssid);

	/* Filter Data frames */
	ret = rtllib_rx_data_filter(ieee, hdr, dst, src, bssid, hdr->addr2);
	if (ret < 0)
		goto rx_dropped;

	if (skb->len == hdrlen)
		goto rx_dropped;

	/* Send pspoll based on moredata */
	if ((ieee->iw_mode == IW_MODE_INFRA)  &&
	    (ieee->sta_sleep == LPS_IS_SLEEP) &&
	    (ieee->polling)) {
		if (WLAN_FC_MORE_DATA(fc)) {
			/* more data bit is set, let's request a new frame
			 * from the AP
			 */
			rtllib_sta_ps_send_pspoll_frame(ieee);
		} else {
			ieee->polling =  false;
		}
	}

	/* Get crypt if encrypted */
	ret = rtllib_rx_get_crypt(ieee, skb, &crypt, hdrlen);
	if (ret == -1)
		goto rx_dropped;

	/* Decrypt data frame (including reassemble) */
	ret = rtllib_rx_decrypt(ieee, skb, rx_stats, crypt, hdrlen);
	if (ret == -1)
		goto rx_dropped;
	else if (ret == -2)
		goto rx_exit;

	/* Get TS for Rx Reorder  */
	hdr = (struct ieee80211_hdr *)skb->data;
	if (ieee->current_network.qos_data.active && is_qos_data_frame(skb->data)
		&& !is_multicast_ether_addr(hdr->addr1)) {
		TID = frame_qos_tid(skb->data);
		seq_num = WLAN_GET_SEQ_SEQ(sc);
		rtllib_get_ts(ieee, (struct ts_common_info **)&ts, hdr->addr2, TID,
		      RX_DIR, true);
		if (TID != 0 && TID != 3)
			ieee->bis_any_nonbepkts = true;
	}

	/* Parse rx data frame (For AMSDU) */
	/* skb: hdr + (possible reassembled) full plaintext payload */
	rxb = kmalloc(sizeof(struct rtllib_rxb), GFP_ATOMIC);
	if (!rxb)
		goto rx_dropped;

	/* to parse amsdu packets */
	/* qos data packets & reserved bit is 1 */
	if (parse_subframe(ieee, skb, rx_stats, rxb, src, dst) == 0) {
		/* only to free rxb, and not submit the packets
		 * to upper layer
		 */
		for (i = 0; i < rxb->nr_subframes; i++)
			dev_kfree_skb(rxb->subframes[i]);
		kfree(rxb);
		rxb = NULL;
		goto rx_dropped;
	}

	/* Update WAPI PN */

	/* Check if leave LPS */
	if (ieee->is_aggregate_frame)
		nr_subframes = rxb->nr_subframes;
	else
		nr_subframes = 1;
	if (unicast)
		ieee->link_detect_info.num_rx_unicast_ok_in_period += nr_subframes;
	rtllib_rx_check_leave_lps(ieee, unicast, nr_subframes);

	/* Indicate packets to upper layer or Rx Reorder */
	if (!ieee->ht_info->cur_rx_reorder_enable || !ts)
		rtllib_rx_indicate_pkt_legacy(ieee, rx_stats, rxb, dst, src);
	else
		rx_reorder_indicate_packet(ieee, rxb, ts, seq_num);

	dev_kfree_skb(skb);

 rx_exit:
	return 1;

 rx_dropped:
	ieee->stats.rx_dropped++;

	/* Returning 0 indicates to caller that we have not handled the SKB--
	 * so it is still allocated and can be used again by underlying
	 * hardware as a DMA target
	 */
	return 0;
}

static int rtllib_rx_monitor(struct rtllib_device *ieee, struct sk_buff *skb,
		 struct rtllib_rx_stats *rx_stats)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	u16 fc = le16_to_cpu(hdr->frame_control);
	size_t hdrlen = rtllib_get_hdrlen(fc);

	if (skb->len < hdrlen) {
		netdev_info(ieee->dev,
			    "%s():ERR!!! skb->len is smaller than hdrlen\n",
			    __func__);
		return 0;
	}

	if (ht_c_check(ieee, skb->data)) {
		if (net_ratelimit())
			netdev_info(ieee->dev, "%s: Find HTCControl!\n",
				    __func__);
		hdrlen += 4;
	}

	ieee->stats.rx_packets++;
	ieee->stats.rx_bytes += skb->len;
	rtllib_monitor_rx(ieee, skb, rx_stats, hdrlen);

	return 1;
}

/* All received frames are sent to this function. @skb contains the frame in
 * IEEE 802.11 format, i.e., in the format it was sent over air.
 * This function is called only as a tasklet (software IRQ).
 */
int rtllib_rx(struct rtllib_device *ieee, struct sk_buff *skb,
		 struct rtllib_rx_stats *rx_stats)
{
	int ret = 0;

	if (!ieee || !skb || !rx_stats) {
		pr_info("%s: Input parameters NULL!\n", __func__);
		goto rx_dropped;
	}
	if (skb->len < 10) {
		netdev_info(ieee->dev, "%s: SKB length < 10\n", __func__);
		goto rx_dropped;
	}

	switch (ieee->iw_mode) {
	case IW_MODE_INFRA:
		ret = rtllib_rx_infra_adhoc(ieee, skb, rx_stats);
		break;
	case IW_MODE_MONITOR:
		ret = rtllib_rx_monitor(ieee, skb, rx_stats);
		break;
	default:
		netdev_info(ieee->dev, "%s: ERR iw mode!!!\n", __func__);
		break;
	}

	return ret;

 rx_dropped:
	if (ieee)
		ieee->stats.rx_dropped++;
	return 0;
}
EXPORT_SYMBOL(rtllib_rx);

static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };

/* Make ther structure we read from the beacon packet has the right values */
static int rtllib_verify_qos_info(struct rtllib_qos_information_element
				     *info_element, int sub_type)
{
	if (info_element->element_id != QOS_ELEMENT_ID)
		return -1;
	if (info_element->qui_subtype != sub_type)
		return -1;
	if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
		return -1;
	if (info_element->qui_type != QOS_OUI_TYPE)
		return -1;
	if (info_element->version != QOS_VERSION_1)
		return -1;

	return 0;
}

/* Parse a QoS parameter element */
static int rtllib_read_qos_param_element(
			struct rtllib_qos_parameter_info *element_param,
			struct rtllib_info_element *info_element)
{
	size_t size = sizeof(*element_param);

	if (!element_param || !info_element || info_element->len != size - 2)
		return -1;

	memcpy(element_param, info_element, size);
	return rtllib_verify_qos_info(&element_param->info_element,
				      QOS_OUI_PARAM_SUB_TYPE);
}

/* Parse a QoS information element */
static int rtllib_read_qos_info_element(
			struct rtllib_qos_information_element *element_info,
			struct rtllib_info_element *info_element)
{
	size_t size = sizeof(*element_info);

	if (!element_info || !info_element || info_element->len != size - 2)
		return -1;

	memcpy(element_info, info_element, size);
	return rtllib_verify_qos_info(element_info, QOS_OUI_INFO_SUB_TYPE);
}

/* Write QoS parameters from the ac parameters. */
static int rtllib_qos_convert_ac_to_parameters(struct rtllib_qos_parameter_info *param_elm,
					       struct rtllib_qos_data *qos_data)
{
	struct rtllib_qos_ac_parameter *ac_params;
	struct rtllib_qos_parameters *qos_param = &(qos_data->parameters);
	int i;
	u8 aci;
	u8 acm;

	qos_data->wmm_acm = 0;
	for (i = 0; i < QOS_QUEUE_NUM; i++) {
		ac_params = &(param_elm->ac_params_record[i]);

		aci = (ac_params->aci_aifsn & 0x60) >> 5;
		acm = (ac_params->aci_aifsn & 0x10) >> 4;

		if (aci >= QOS_QUEUE_NUM)
			continue;
		switch (aci) {
		case 1:
			/* BIT(0) | BIT(3) */
			if (acm)
				qos_data->wmm_acm |= (0x01 << 0) | (0x01 << 3);
			break;
		case 2:
			/* BIT(4) | BIT(5) */
			if (acm)
				qos_data->wmm_acm |= (0x01 << 4) | (0x01 << 5);
			break;
		case 3:
			/* BIT(6) | BIT(7) */
			if (acm)
				qos_data->wmm_acm |= (0x01 << 6) | (0x01 << 7);
			break;
		case 0:
		default:
			/* BIT(1) | BIT(2) */
			if (acm)
				qos_data->wmm_acm |= (0x01 << 1) | (0x01 << 2);
			break;
		}

		qos_param->aifs[aci] = (ac_params->aci_aifsn) & 0x0f;

		/* WMM spec P.11: The minimum value for AIFSN shall be 2 */
		qos_param->aifs[aci] = max_t(u8, qos_param->aifs[aci], 2);

		qos_param->cw_min[aci] = cpu_to_le16(ac_params->ecw_min_max &
						     0x0F);

		qos_param->cw_max[aci] = cpu_to_le16((ac_params->ecw_min_max &
						      0xF0) >> 4);

		qos_param->flag[aci] =
		    (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
		qos_param->tx_op_limit[aci] = ac_params->tx_op_limit;
	}
	return 0;
}

/* we have a generic data element which it may contain QoS information or
 * parameters element. check the information element length to decide
 * which type to read
 */
static int rtllib_parse_qos_info_param_IE(struct rtllib_device *ieee,
					  struct rtllib_info_element
					     *info_element,
					  struct rtllib_network *network)
{
	int rc = 0;
	struct rtllib_qos_information_element qos_info_element;

	rc = rtllib_read_qos_info_element(&qos_info_element, info_element);

	if (rc == 0) {
		network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
		network->flags |= NETWORK_HAS_QOS_INFORMATION;
	} else {
		struct rtllib_qos_parameter_info param_element;

		rc = rtllib_read_qos_param_element(&param_element,
						      info_element);
		if (rc == 0) {
			rtllib_qos_convert_ac_to_parameters(&param_element,
							       &(network->qos_data));
			network->flags |= NETWORK_HAS_QOS_PARAMETERS;
			network->qos_data.param_count =
			    param_element.info_element.ac_info & 0x0F;
		}
	}

	if (rc == 0) {
		netdev_dbg(ieee->dev, "QoS is supported\n");
		network->qos_data.supported = 1;
	}
	return rc;
}

static const char *get_info_element_string(u16 id)
{
	switch (id) {
	case MFIE_TYPE_SSID:
		return "SSID";
	case MFIE_TYPE_RATES:
		return "RATES";
	case MFIE_TYPE_FH_SET:
		return "FH_SET";
	case MFIE_TYPE_DS_SET:
		return "DS_SET";
	case MFIE_TYPE_CF_SET:
		return "CF_SET";
	case MFIE_TYPE_TIM:
		return "TIM";
	case MFIE_TYPE_IBSS_SET:
		return "IBSS_SET";
	case MFIE_TYPE_COUNTRY:
		return "COUNTRY";
	case MFIE_TYPE_HOP_PARAMS:
		return "HOP_PARAMS";
	case MFIE_TYPE_HOP_TABLE:
		return "HOP_TABLE";
	case MFIE_TYPE_REQUEST:
		return "REQUEST";
	case MFIE_TYPE_CHALLENGE:
		return "CHALLENGE";
	case MFIE_TYPE_POWER_CONSTRAINT:
		return "POWER_CONSTRAINT";
	case MFIE_TYPE_POWER_CAPABILITY:
		return "POWER_CAPABILITY";
	case MFIE_TYPE_TPC_REQUEST:
		return "TPC_REQUEST";
	case MFIE_TYPE_TPC_REPORT:
		return "TPC_REPORT";
	case MFIE_TYPE_SUPP_CHANNELS:
		return "SUPP_CHANNELS";
	case MFIE_TYPE_CSA:
		return "CSA";
	case MFIE_TYPE_MEASURE_REQUEST:
		return "MEASURE_REQUEST";
	case MFIE_TYPE_MEASURE_REPORT:
		return "MEASURE_REPORT";
	case MFIE_TYPE_QUIET:
		return "QUIET";
	case MFIE_TYPE_IBSS_DFS:
		return "IBSS_DFS";
	case MFIE_TYPE_RSN:
		return "RSN";
	case MFIE_TYPE_RATES_EX:
		return "RATES_EX";
	case MFIE_TYPE_GENERIC:
		return "GENERIC";
	case MFIE_TYPE_QOS_PARAMETER:
		return "QOS_PARAMETER";
	default:
		return "UNKNOWN";
	}
}

static void rtllib_parse_mife_generic(struct rtllib_device *ieee,
				      struct rtllib_info_element *info_element,
				      struct rtllib_network *network,
				      u16 *tmp_htcap_len,
				      u16 *tmp_htinfo_len)
{
	u16 ht_realtek_agg_len = 0;
	u8  ht_realtek_agg_buf[MAX_IE_LEN];

	if (!rtllib_parse_qos_info_param_IE(ieee, info_element, network))
		return;
	if (info_element->len >= 4 &&
	    info_element->data[0] == 0x00 &&
	    info_element->data[1] == 0x50 &&
	    info_element->data[2] == 0xf2 &&
	    info_element->data[3] == 0x01) {
		network->wpa_ie_len = min(info_element->len + 2,
					  MAX_WPA_IE_LEN);
		memcpy(network->wpa_ie, info_element, network->wpa_ie_len);
		return;
	}
	if (info_element->len == 7 &&
	    info_element->data[0] == 0x00 &&
	    info_element->data[1] == 0xe0 &&
	    info_element->data[2] == 0x4c &&
	    info_element->data[3] == 0x01 &&
	    info_element->data[4] == 0x02)
		network->turbo_enable = 1;

	if (*tmp_htcap_len == 0) {
		if (info_element->len >= 4 &&
		    info_element->data[0] == 0x00 &&
		    info_element->data[1] == 0x90 &&
		    info_element->data[2] == 0x4c &&
		    info_element->data[3] == 0x033) {
			*tmp_htcap_len = min_t(u8, info_element->len,
					       MAX_IE_LEN);
			if (*tmp_htcap_len != 0) {
				network->bssht.bd_ht_spec_ver = HT_SPEC_VER_EWC;
				network->bssht.bd_ht_cap_len = min_t(u16, *tmp_htcap_len,
								  sizeof(network->bssht.bd_ht_cap_buf));
				memcpy(network->bssht.bd_ht_cap_buf,
				       info_element->data,
				       network->bssht.bd_ht_cap_len);
			}
		}
		if (*tmp_htcap_len != 0) {
			network->bssht.bd_support_ht = true;
			network->bssht.bd_ht_1r = ((((struct ht_capab_ele *)(network->bssht.bd_ht_cap_buf))->MCS[1]) == 0);
		} else {
			network->bssht.bd_support_ht = false;
			network->bssht.bd_ht_1r = false;
		}
	}

	if (*tmp_htinfo_len == 0) {
		if (info_element->len >= 4 &&
		    info_element->data[0] == 0x00 &&
		    info_element->data[1] == 0x90 &&
		    info_element->data[2] == 0x4c &&
		    info_element->data[3] == 0x034) {
			*tmp_htinfo_len = min_t(u8, info_element->len,
						MAX_IE_LEN);
			if (*tmp_htinfo_len != 0) {
				network->bssht.bd_ht_spec_ver = HT_SPEC_VER_EWC;
				network->bssht.bd_ht_info_len = min_t(u16, *tmp_htinfo_len,
								      sizeof(network->bssht.bd_ht_info_buf));
				memcpy(network->bssht.bd_ht_info_buf,
				       info_element->data,
				       network->bssht.bd_ht_info_len);
			}
		}
	}

	if (network->bssht.bd_support_ht) {
		if (info_element->len >= 4 &&
		    info_element->data[0] == 0x00 &&
		    info_element->data[1] == 0xe0 &&
		    info_element->data[2] == 0x4c &&
		    info_element->data[3] == 0x02) {
			ht_realtek_agg_len = min_t(u8, info_element->len,
						   MAX_IE_LEN);
			memcpy(ht_realtek_agg_buf, info_element->data,
			       info_element->len);
		}
		if (ht_realtek_agg_len >= 5) {
			network->realtek_cap_exit = true;
			network->bssht.bd_rt2rt_aggregation = true;

			if ((ht_realtek_agg_buf[4] == 1) &&
			    (ht_realtek_agg_buf[5] & 0x02))
				network->bssht.bd_rt2rt_long_slot_time = true;

			if ((ht_realtek_agg_buf[4] == 1) &&
			    (ht_realtek_agg_buf[5] & RT_HT_CAP_USE_92SE))
				network->bssht.rt2rt_ht_mode |= RT_HT_CAP_USE_92SE;
		}
	}
	if (ht_realtek_agg_len >= 5) {
		if ((ht_realtek_agg_buf[5] & RT_HT_CAP_USE_SOFTAP))
			network->bssht.rt2rt_ht_mode |= RT_HT_CAP_USE_SOFTAP;
	}

	if ((info_element->len >= 3 &&
	     info_element->data[0] == 0x00 &&
	     info_element->data[1] == 0x05 &&
	     info_element->data[2] == 0xb5) ||
	     (info_element->len >= 3 &&
	     info_element->data[0] == 0x00 &&
	     info_element->data[1] == 0x0a &&
	     info_element->data[2] == 0xf7) ||
	     (info_element->len >= 3 &&
	     info_element->data[0] == 0x00 &&
	     info_element->data[1] == 0x10 &&
	     info_element->data[2] == 0x18)) {
		network->broadcom_cap_exist = true;
	}
	if (info_element->len >= 3 &&
	    info_element->data[0] == 0x00 &&
	    info_element->data[1] == 0x0c &&
	    info_element->data[2] == 0x43)
		network->ralink_cap_exist = true;
	if ((info_element->len >= 3 &&
	     info_element->data[0] == 0x00 &&
	     info_element->data[1] == 0x03 &&
	     info_element->data[2] == 0x7f) ||
	     (info_element->len >= 3 &&
	     info_element->data[0] == 0x00 &&
	     info_element->data[1] == 0x13 &&
	     info_element->data[2] == 0x74))
		network->atheros_cap_exist = true;

	if ((info_element->len >= 3 &&
	     info_element->data[0] == 0x00 &&
	     info_element->data[1] == 0x50 &&
	     info_element->data[2] == 0x43))
		network->marvell_cap_exist = true;
	if (info_element->len >= 3 &&
	    info_element->data[0] == 0x00 &&
	    info_element->data[1] == 0x40 &&
	    info_element->data[2] == 0x96)
		network->cisco_cap_exist = true;

	if (info_element->len >= 3 &&
	    info_element->data[0] == 0x00 &&
	    info_element->data[1] == 0x0a &&
	    info_element->data[2] == 0xf5)
		network->airgo_cap_exist = true;

	if (info_element->len > 4 &&
	    info_element->data[0] == 0x00 &&
	    info_element->data[1] == 0x40 &&
	    info_element->data[2] == 0x96 &&
	    info_element->data[3] == 0x01) {
		if (info_element->len == 6) {
			memcpy(network->ccx_rm_state, &info_element->data[4], 2);
			if (network->ccx_rm_state[0] != 0)
				network->ccx_rm_enable = true;
			else
				network->ccx_rm_enable = false;
			network->mb_ssid_mask = network->ccx_rm_state[1] & 0x07;
			if (network->mb_ssid_mask != 0) {
				network->mb_ssid_valid = true;
				network->mb_ssid_mask = 0xff <<
						      (network->mb_ssid_mask);
				ether_addr_copy(network->mb_ssid,
						network->bssid);
				network->mb_ssid[5] &= network->mb_ssid_mask;
			} else {
				network->mb_ssid_valid = false;
			}
		} else {
			network->ccx_rm_enable = false;
		}
	}
	if (info_element->len > 4  &&
	    info_element->data[0] == 0x00 &&
	    info_element->data[1] == 0x40 &&
	    info_element->data[2] == 0x96 &&
	    info_element->data[3] == 0x03) {
		if (info_element->len == 5) {
			network->with_ccx_ver_num = true;
			network->bss_ccx_ver_number = info_element->data[4];
		} else {
			network->with_ccx_ver_num = false;
			network->bss_ccx_ver_number = 0;
		}
	}
	if (info_element->len > 4  &&
	    info_element->data[0] == 0x00 &&
	    info_element->data[1] == 0x50 &&
	    info_element->data[2] == 0xf2 &&
	    info_element->data[3] == 0x04) {
		netdev_dbg(ieee->dev, "MFIE_TYPE_WZC: %d bytes\n",
			   info_element->len);
		network->wzc_ie_len = min(info_element->len + 2, MAX_WZC_IE_LEN);
		memcpy(network->wzc_ie, info_element, network->wzc_ie_len);
	}
}

static void rtllib_parse_mfie_ht_cap(struct rtllib_info_element *info_element,
				     struct rtllib_network *network,
				     u16 *tmp_htcap_len)
{
	struct bss_ht *ht = &network->bssht;

	*tmp_htcap_len = min_t(u8, info_element->len, MAX_IE_LEN);
	if (*tmp_htcap_len != 0) {
		ht->bd_ht_spec_ver = HT_SPEC_VER_EWC;
		ht->bd_ht_cap_len = min_t(u16, *tmp_htcap_len,
				       sizeof(ht->bd_ht_cap_buf));
		memcpy(ht->bd_ht_cap_buf, info_element->data, ht->bd_ht_cap_len);

		ht->bd_support_ht = true;
		ht->bd_ht_1r = ((((struct ht_capab_ele *)
				ht->bd_ht_cap_buf))->MCS[1]) == 0;

		ht->bd_bandwidth = (enum ht_channel_width)
					     (((struct ht_capab_ele *)
					     (ht->bd_ht_cap_buf))->chl_width);
	} else {
		ht->bd_support_ht = false;
		ht->bd_ht_1r = false;
		ht->bd_bandwidth = HT_CHANNEL_WIDTH_20;
	}
}

int rtllib_parse_info_param(struct rtllib_device *ieee,
		struct rtllib_info_element *info_element,
		u16 length,
		struct rtllib_network *network,
		struct rtllib_rx_stats *stats)
{
	u8 i;
	short offset;
	u16	tmp_htcap_len = 0;
	u16	tmp_htinfo_len = 0;
	char rates_str[64];
	char *p;

	while (length >= sizeof(*info_element)) {
		if (sizeof(*info_element) + info_element->len > length) {
			netdev_dbg(ieee->dev,
				   "Info elem: parse failed: info_element->len + 2 > left : info_element->len+2=%zd left=%d, id=%d.\n",
				   info_element->len + sizeof(*info_element),
				   length, info_element->id);
			/* We stop processing but don't return an error here
			 * because some misbehaviour APs break this rule. ie.
			 * Orinoco AP1000.
			 */
			break;
		}

		switch (info_element->id) {
		case MFIE_TYPE_SSID:
			if (rtllib_is_empty_essid(info_element->data,
						  info_element->len)) {
				network->flags |= NETWORK_EMPTY_ESSID;
				break;
			}

			network->ssid_len = min(info_element->len,
						(u8)IW_ESSID_MAX_SIZE);
			memcpy(network->ssid, info_element->data,
			       network->ssid_len);
			if (network->ssid_len < IW_ESSID_MAX_SIZE)
				memset(network->ssid + network->ssid_len, 0,
				       IW_ESSID_MAX_SIZE - network->ssid_len);

			netdev_dbg(ieee->dev, "MFIE_TYPE_SSID: '%s' len=%d.\n",
				   network->ssid, network->ssid_len);
			break;

		case MFIE_TYPE_RATES:
			p = rates_str;
			network->rates_len = min(info_element->len,
						 MAX_RATES_LENGTH);
			for (i = 0; i < network->rates_len; i++) {
				network->rates[i] = info_element->data[i];
				p += scnprintf(p, sizeof(rates_str) -
					      (p - rates_str), "%02X ",
					      network->rates[i]);
				if (rtllib_is_ofdm_rate
				    (info_element->data[i])) {
					network->flags |= NETWORK_HAS_OFDM;
					if (info_element->data[i] &
					    RTLLIB_BASIC_RATE_MASK)
						network->flags &=
						    ~NETWORK_HAS_CCK;
				}

				if (rtllib_is_cck_rate
				    (info_element->data[i])) {
					network->flags |= NETWORK_HAS_CCK;
				}
			}

			netdev_dbg(ieee->dev, "MFIE_TYPE_RATES: '%s' (%d)\n",
				   rates_str, network->rates_len);
			break;

		case MFIE_TYPE_RATES_EX:
			p = rates_str;
			network->rates_ex_len = min(info_element->len,
						    MAX_RATES_EX_LENGTH);
			for (i = 0; i < network->rates_ex_len; i++) {
				network->rates_ex[i] = info_element->data[i];
				p += scnprintf(p, sizeof(rates_str) -
					      (p - rates_str), "%02X ",
					      network->rates_ex[i]);
				if (rtllib_is_ofdm_rate
				    (info_element->data[i])) {
					network->flags |= NETWORK_HAS_OFDM;
					if (info_element->data[i] &
					    RTLLIB_BASIC_RATE_MASK)
						network->flags &=
						    ~NETWORK_HAS_CCK;
				}
			}

			netdev_dbg(ieee->dev, "MFIE_TYPE_RATES_EX: '%s' (%d)\n",
				   rates_str, network->rates_ex_len);
			break;

		case MFIE_TYPE_DS_SET:
			netdev_dbg(ieee->dev, "MFIE_TYPE_DS_SET: %d\n",
				   info_element->data[0]);
			network->channel = info_element->data[0];
			break;

		case MFIE_TYPE_FH_SET:
			netdev_dbg(ieee->dev, "MFIE_TYPE_FH_SET: ignored\n");
			break;

		case MFIE_TYPE_CF_SET:
			netdev_dbg(ieee->dev, "MFIE_TYPE_CF_SET: ignored\n");
			break;

		case MFIE_TYPE_TIM:
			if (info_element->len < 4)
				break;

			network->tim.tim_count = info_element->data[0];
			network->tim.tim_period = info_element->data[1];

			network->dtim_period = info_element->data[1];
			if (ieee->link_state != MAC80211_LINKED)
				break;
			network->last_dtim_sta_time = jiffies;

			network->dtim_data = RTLLIB_DTIM_VALID;

			if (info_element->data[2] & 1)
				network->dtim_data |= RTLLIB_DTIM_MBCAST;

			offset = (info_element->data[2] >> 1) * 2;

			if (ieee->assoc_id < 8 * offset ||
			    ieee->assoc_id > 8 * (offset + info_element->len - 3))
				break;

			offset = (ieee->assoc_id / 8) - offset;
			if (info_element->data[3 + offset] &
			   (1 << (ieee->assoc_id % 8)))
				network->dtim_data |= RTLLIB_DTIM_UCAST;

			network->listen_interval = network->dtim_period;
			break;

		case MFIE_TYPE_ERP:
			network->erp_value = info_element->data[0];
			network->flags |= NETWORK_HAS_ERP_VALUE;
			netdev_dbg(ieee->dev, "MFIE_TYPE_ERP_SET: %d\n",
				   network->erp_value);
			break;
		case MFIE_TYPE_IBSS_SET:
			network->atim_window = info_element->data[0];
			netdev_dbg(ieee->dev, "MFIE_TYPE_IBSS_SET: %d\n",
				   network->atim_window);
			break;

		case MFIE_TYPE_CHALLENGE:
			netdev_dbg(ieee->dev, "MFIE_TYPE_CHALLENGE: ignored\n");
			break;

		case MFIE_TYPE_GENERIC:
			netdev_dbg(ieee->dev, "MFIE_TYPE_GENERIC: %d bytes\n",
				   info_element->len);

			rtllib_parse_mife_generic(ieee, info_element, network,
						  &tmp_htcap_len,
						  &tmp_htinfo_len);
			break;

		case MFIE_TYPE_RSN:
			netdev_dbg(ieee->dev, "MFIE_TYPE_RSN: %d bytes\n",
				   info_element->len);
			network->rsn_ie_len = min(info_element->len + 2,
						  MAX_WPA_IE_LEN);
			memcpy(network->rsn_ie, info_element,
			       network->rsn_ie_len);
			break;

		case MFIE_TYPE_HT_CAP:
			netdev_dbg(ieee->dev, "MFIE_TYPE_HT_CAP: %d bytes\n",
				   info_element->len);

			rtllib_parse_mfie_ht_cap(info_element, network,
						 &tmp_htcap_len);
			break;

		case MFIE_TYPE_HT_INFO:
			netdev_dbg(ieee->dev, "MFIE_TYPE_HT_INFO: %d bytes\n",
				   info_element->len);
			tmp_htinfo_len = min_t(u8, info_element->len,
					       MAX_IE_LEN);
			if (tmp_htinfo_len) {
				network->bssht.bd_ht_spec_ver = HT_SPEC_VER_IEEE;
				network->bssht.bd_ht_info_len = tmp_htinfo_len >
					sizeof(network->bssht.bd_ht_info_buf) ?
					sizeof(network->bssht.bd_ht_info_buf) :
					tmp_htinfo_len;
				memcpy(network->bssht.bd_ht_info_buf,
				       info_element->data,
				       network->bssht.bd_ht_info_len);
			}
			break;

		case MFIE_TYPE_AIRONET:
			netdev_dbg(ieee->dev, "MFIE_TYPE_AIRONET: %d bytes\n",
				   info_element->len);
			if (info_element->len > IE_CISCO_FLAG_POSITION) {
				network->with_aironet_ie = true;

				if ((info_element->data[IE_CISCO_FLAG_POSITION]
				     & SUPPORT_CKIP_MIC) ||
				     (info_element->data[IE_CISCO_FLAG_POSITION]
				     & SUPPORT_CKIP_PK))
					network->ckip_supported = true;
				else
					network->ckip_supported = false;
			} else {
				network->with_aironet_ie = false;
				network->ckip_supported = false;
			}
			break;
		case MFIE_TYPE_QOS_PARAMETER:
			netdev_err(ieee->dev,
				   "QoS Error need to parse QOS_PARAMETER IE\n");
			break;

		case MFIE_TYPE_COUNTRY:
			netdev_dbg(ieee->dev, "MFIE_TYPE_COUNTRY: %d bytes\n",
				   info_element->len);
			break;
/* TODO */
		default:
			netdev_dbg(ieee->dev,
				   "Unsupported info element: %s (%d)\n",
				   get_info_element_string(info_element->id),
				   info_element->id);
			break;
		}

		length -= sizeof(*info_element) + info_element->len;
		info_element =
		    (struct rtllib_info_element *)&info_element->data[info_element->len];
	}

	if (!network->atheros_cap_exist && !network->broadcom_cap_exist &&
	    !network->cisco_cap_exist && !network->ralink_cap_exist &&
	    !network->bssht.bd_rt2rt_aggregation)
		network->unknown_cap_exist = true;
	else
		network->unknown_cap_exist = false;
	return 0;
}

static long rtllib_translate_todbm(u8 signal_strength_index)
{
	long	signal_power;

	signal_power = (long)((signal_strength_index + 1) >> 1);
	signal_power -= 95;

	return signal_power;
}

static inline int rtllib_network_init(
	struct rtllib_device *ieee,
	struct rtllib_probe_response *beacon,
	struct rtllib_network *network,
	struct rtllib_rx_stats *stats)
{
	memset(&network->qos_data, 0, sizeof(struct rtllib_qos_data));

	/* Pull out fixed field data */
	ether_addr_copy(network->bssid, beacon->header.addr3);
	network->capability = le16_to_cpu(beacon->capability);
	network->last_scanned = jiffies;
	network->time_stamp[0] = beacon->time_stamp[0];
	network->time_stamp[1] = beacon->time_stamp[1];
	network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
	/* Where to pull this? beacon->listen_interval;*/
	network->listen_interval = 0x0A;
	network->rates_len = network->rates_ex_len = 0;
	network->ssid_len = 0;
	network->hidden_ssid_len = 0;
	memset(network->hidden_ssid, 0, sizeof(network->hidden_ssid));
	network->flags = 0;
	network->atim_window = 0;
	network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
	    0x3 : 0x0;
	network->berp_info_valid = false;
	network->broadcom_cap_exist = false;
	network->ralink_cap_exist = false;
	network->atheros_cap_exist = false;
	network->cisco_cap_exist = false;
	network->unknown_cap_exist = false;
	network->realtek_cap_exit = false;
	network->marvell_cap_exist = false;
	network->airgo_cap_exist = false;
	network->turbo_enable = 0;
	network->signal_strength = stats->signal_strength;
	network->RSSI = stats->signal_strength;
	network->country_ie_len = 0;
	memset(network->country_ie_buf, 0, MAX_IE_LEN);
	ht_initialize_bss_desc(&network->bssht);
	network->flags |= NETWORK_HAS_CCK;

	network->wpa_ie_len = 0;
	network->rsn_ie_len = 0;
	network->wzc_ie_len = 0;

	if (rtllib_parse_info_param(ieee,
				    beacon->info_element,
				    (stats->len - sizeof(*beacon)),
				    network,
				    stats))
		return 1;

	network->mode = 0;

	if (network->flags & NETWORK_HAS_OFDM)
		network->mode |= WIRELESS_MODE_G;
	if (network->flags & NETWORK_HAS_CCK)
		network->mode |= WIRELESS_MODE_B;

	if (network->mode == 0) {
		netdev_dbg(ieee->dev, "Filtered out '%s (%pM)' network.\n",
			   escape_essid(network->ssid, network->ssid_len),
			   network->bssid);
		return 1;
	}

	if (network->bssht.bd_support_ht) {
		if (network->mode & (WIRELESS_MODE_G | WIRELESS_MODE_B))
			network->mode = WIRELESS_MODE_N_24G;
	}
	if (rtllib_is_empty_essid(network->ssid, network->ssid_len))
		network->flags |= NETWORK_EMPTY_ESSID;
	stats->signal = 30 + (stats->signal_strength * 70) / 100;
	stats->noise = rtllib_translate_todbm((u8)(100 - stats->signal)) - 25;

	memcpy(&network->stats, stats, sizeof(network->stats));

	return 0;
}

static inline int is_same_network(struct rtllib_network *src,
				  struct rtllib_network *dst, u8 ssidbroad)
{
	/* A network is only a duplicate if the channel, BSSID, ESSID
	 * and the capability field (in particular IBSS and BSS) all match.
	 * We treat all <hidden> with the same BSSID and channel
	 * as one network
	 */
	return (((src->ssid_len == dst->ssid_len) || (!ssidbroad)) &&
		(src->channel == dst->channel) &&
		!memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
		(!memcmp(src->ssid, dst->ssid, src->ssid_len) ||
		(!ssidbroad)) &&
		((src->capability & WLAN_CAPABILITY_IBSS) ==
		(dst->capability & WLAN_CAPABILITY_IBSS)) &&
		((src->capability & WLAN_CAPABILITY_ESS) ==
		(dst->capability & WLAN_CAPABILITY_ESS)));
}

static inline void update_network(struct rtllib_device *ieee,
				  struct rtllib_network *dst,
				  struct rtllib_network *src)
{
	int qos_active;
	u8 old_param;

	memcpy(&dst->stats, &src->stats, sizeof(struct rtllib_rx_stats));
	dst->capability = src->capability;
	memcpy(dst->rates, src->rates, src->rates_len);
	dst->rates_len = src->rates_len;
	memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
	dst->rates_ex_len = src->rates_ex_len;
	if (src->ssid_len > 0) {
		if (dst->ssid_len == 0) {
			memset(dst->hidden_ssid, 0, sizeof(dst->hidden_ssid));
			dst->hidden_ssid_len = src->ssid_len;
			memcpy(dst->hidden_ssid, src->ssid, src->ssid_len);
		} else {
			memset(dst->ssid, 0, dst->ssid_len);
			dst->ssid_len = src->ssid_len;
			memcpy(dst->ssid, src->ssid, src->ssid_len);
		}
	}
	dst->mode = src->mode;
	dst->flags = src->flags;
	dst->time_stamp[0] = src->time_stamp[0];
	dst->time_stamp[1] = src->time_stamp[1];
	if (src->flags & NETWORK_HAS_ERP_VALUE) {
		dst->erp_value = src->erp_value;
		dst->berp_info_valid = src->berp_info_valid = true;
	}
	dst->beacon_interval = src->beacon_interval;
	dst->listen_interval = src->listen_interval;
	dst->atim_window = src->atim_window;
	dst->dtim_period = src->dtim_period;
	dst->dtim_data = src->dtim_data;
	dst->last_dtim_sta_time = src->last_dtim_sta_time;
	memcpy(&dst->tim, &src->tim, sizeof(struct rtllib_tim_parameters));

	dst->bssht.bd_support_ht = src->bssht.bd_support_ht;
	dst->bssht.bd_rt2rt_aggregation = src->bssht.bd_rt2rt_aggregation;
	dst->bssht.bd_ht_cap_len = src->bssht.bd_ht_cap_len;
	memcpy(dst->bssht.bd_ht_cap_buf, src->bssht.bd_ht_cap_buf,
	       src->bssht.bd_ht_cap_len);
	dst->bssht.bd_ht_info_len = src->bssht.bd_ht_info_len;
	memcpy(dst->bssht.bd_ht_info_buf, src->bssht.bd_ht_info_buf,
	       src->bssht.bd_ht_info_len);
	dst->bssht.bd_ht_spec_ver = src->bssht.bd_ht_spec_ver;
	dst->bssht.bd_rt2rt_long_slot_time = src->bssht.bd_rt2rt_long_slot_time;
	dst->broadcom_cap_exist = src->broadcom_cap_exist;
	dst->ralink_cap_exist = src->ralink_cap_exist;
	dst->atheros_cap_exist = src->atheros_cap_exist;
	dst->realtek_cap_exit = src->realtek_cap_exit;
	dst->marvell_cap_exist = src->marvell_cap_exist;
	dst->cisco_cap_exist = src->cisco_cap_exist;
	dst->airgo_cap_exist = src->airgo_cap_exist;
	dst->unknown_cap_exist = src->unknown_cap_exist;
	memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
	dst->wpa_ie_len = src->wpa_ie_len;
	memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
	dst->rsn_ie_len = src->rsn_ie_len;
	memcpy(dst->wzc_ie, src->wzc_ie, src->wzc_ie_len);
	dst->wzc_ie_len = src->wzc_ie_len;

	dst->last_scanned = jiffies;
	/* qos related parameters */
	qos_active = dst->qos_data.active;
	old_param = dst->qos_data.param_count;
	dst->qos_data.supported = src->qos_data.supported;
	if (dst->flags & NETWORK_HAS_QOS_PARAMETERS)
		memcpy(&dst->qos_data, &src->qos_data,
		       sizeof(struct rtllib_qos_data));
	if (dst->qos_data.supported == 1) {
		if (dst->ssid_len)
			netdev_dbg(ieee->dev,
				   "QoS the network %s is QoS supported\n",
				   dst->ssid);
		else
			netdev_dbg(ieee->dev,
				   "QoS the network is QoS supported\n");
	}
	dst->qos_data.active = qos_active;
	dst->qos_data.old_param_count = old_param;

	dst->wmm_info = src->wmm_info;
	if (src->wmm_param[0].ac_aci_acm_aifsn ||
	   src->wmm_param[1].ac_aci_acm_aifsn ||
	   src->wmm_param[2].ac_aci_acm_aifsn ||
	   src->wmm_param[3].ac_aci_acm_aifsn)
		memcpy(dst->wmm_param, src->wmm_param, WME_AC_PRAM_LEN);

	dst->signal_strength = src->signal_strength;
	dst->RSSI = src->RSSI;
	dst->turbo_enable = src->turbo_enable;

	dst->country_ie_len = src->country_ie_len;
	memcpy(dst->country_ie_buf, src->country_ie_buf, src->country_ie_len);

	dst->with_aironet_ie = src->with_aironet_ie;
	dst->ckip_supported = src->ckip_supported;
	memcpy(dst->ccx_rm_state, src->ccx_rm_state, 2);
	dst->ccx_rm_enable = src->ccx_rm_enable;
	dst->mb_ssid_mask = src->mb_ssid_mask;
	dst->mb_ssid_valid = src->mb_ssid_valid;
	memcpy(dst->mb_ssid, src->mb_ssid, 6);
	dst->with_ccx_ver_num = src->with_ccx_ver_num;
	dst->bss_ccx_ver_number = src->bss_ccx_ver_number;
}

static int is_passive_channel(struct rtllib_device *rtllib, u8 channel)
{
	if (channel > MAX_CHANNEL_NUMBER) {
		netdev_info(rtllib->dev, "%s(): Invalid Channel\n", __func__);
		return 0;
	}

	if (rtllib->active_channel_map[channel] == 2)
		return 1;

	return 0;
}

int rtllib_legal_channel(struct rtllib_device *rtllib, u8 channel)
{
	if (channel > MAX_CHANNEL_NUMBER) {
		netdev_info(rtllib->dev, "%s(): Invalid Channel\n", __func__);
		return 0;
	}
	if (rtllib->active_channel_map[channel] > 0)
		return 1;

	return 0;
}
EXPORT_SYMBOL(rtllib_legal_channel);

static inline void rtllib_process_probe_response(
	struct rtllib_device *ieee,
	struct rtllib_probe_response *beacon,
	struct rtllib_rx_stats *stats)
{
	struct rtllib_network *target;
	struct rtllib_network *oldest = NULL;
	struct rtllib_info_element *info_element = &beacon->info_element[0];
	unsigned long flags;
	short renew;
	struct rtllib_network *network = kzalloc(sizeof(struct rtllib_network),
						 GFP_ATOMIC);
	__le16 frame_ctl = beacon->header.frame_control;

	if (!network)
		return;

	netdev_dbg(ieee->dev,
		   "'%s' ( %pM ): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
		   escape_essid(info_element->data, info_element->len),
		   beacon->header.addr3,
		   (le16_to_cpu(beacon->capability) & (1 << 0xf)) ? '1' : '0',
		   (le16_to_cpu(beacon->capability) & (1 << 0xe)) ? '1' : '0',
		   (le16_to_cpu(beacon->capability) & (1 << 0xd)) ? '1' : '0',
		   (le16_to_cpu(beacon->capability) & (1 << 0xc)) ? '1' : '0',
		   (le16_to_cpu(beacon->capability) & (1 << 0xb)) ? '1' : '0',
		   (le16_to_cpu(beacon->capability) & (1 << 0xa)) ? '1' : '0',
		   (le16_to_cpu(beacon->capability) & (1 << 0x9)) ? '1' : '0',
		   (le16_to_cpu(beacon->capability) & (1 << 0x8)) ? '1' : '0',
		   (le16_to_cpu(beacon->capability) & (1 << 0x7)) ? '1' : '0',
		   (le16_to_cpu(beacon->capability) & (1 << 0x6)) ? '1' : '0',
		   (le16_to_cpu(beacon->capability) & (1 << 0x5)) ? '1' : '0',
		   (le16_to_cpu(beacon->capability) & (1 << 0x4)) ? '1' : '0',
		   (le16_to_cpu(beacon->capability) & (1 << 0x3)) ? '1' : '0',
		   (le16_to_cpu(beacon->capability) & (1 << 0x2)) ? '1' : '0',
		   (le16_to_cpu(beacon->capability) & (1 << 0x1)) ? '1' : '0',
		   (le16_to_cpu(beacon->capability) & (1 << 0x0)) ? '1' : '0');

	if (rtllib_network_init(ieee, beacon, network, stats)) {
		netdev_dbg(ieee->dev, "Dropped '%s' ( %pM) via %s.\n",
			   escape_essid(info_element->data, info_element->len),
			   beacon->header.addr3,
			   ieee80211_is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
		goto free_network;
	}

	if (!rtllib_legal_channel(ieee, network->channel))
		goto free_network;

	if (ieee80211_is_probe_resp(frame_ctl)) {
		if (is_passive_channel(ieee, network->channel)) {
			netdev_info(ieee->dev,
				    "GetScanInfo(): For Global Domain, filter probe response at channel(%d).\n",
				    network->channel);
			goto free_network;
		}
	}

	/* The network parsed correctly -- so now we scan our known networks
	 * to see if we can find it in our list.
	 *
	 * NOTE:  This search is definitely not optimized.  Once its doing
	 *	the "right thing" we'll optimize it for efficiency if
	 *	necessary
	 */

	/* Search for this entry in the list and update it if it is
	 * already there.
	 */

	spin_lock_irqsave(&ieee->lock, flags);
	if (is_same_network(&ieee->current_network, network,
	   (network->ssid_len ? 1 : 0))) {
		update_network(ieee, &ieee->current_network, network);
		if ((ieee->current_network.mode == WIRELESS_MODE_N_24G ||
		     ieee->current_network.mode == WIRELESS_MODE_G) &&
		    ieee->current_network.berp_info_valid) {
			if (ieee->current_network.erp_value & ERP_UseProtection)
				ieee->current_network.buseprotection = true;
			else
				ieee->current_network.buseprotection = false;
		}
		if (ieee80211_is_beacon(frame_ctl)) {
			if (ieee->link_state >= MAC80211_LINKED)
				ieee->link_detect_info.num_recv_bcn_in_period++;
		}
	}
	list_for_each_entry(target, &ieee->network_list, list) {
		if (is_same_network(target, network,
		   (target->ssid_len ? 1 : 0)))
			break;
		if (!oldest || (target->last_scanned < oldest->last_scanned))
			oldest = target;
	}

	/* If we didn't find a match, then get a new network slot to initialize
	 * with this beacon's information
	 */
	if (&target->list == &ieee->network_list) {
		if (list_empty(&ieee->network_free_list)) {
			/* If there are no more slots, expire the oldest */
			list_del(&oldest->list);
			target = oldest;
			netdev_dbg(ieee->dev,
				   "Expired '%s' ( %pM) from network list.\n",
				   escape_essid(target->ssid, target->ssid_len),
				   target->bssid);
		} else {
			/* Otherwise just pull from the free list */
			target = list_entry(ieee->network_free_list.next,
					    struct rtllib_network, list);
			list_del(ieee->network_free_list.next);
		}

		netdev_dbg(ieee->dev, "Adding '%s' ( %pM) via %s.\n",
			   escape_essid(network->ssid, network->ssid_len),
			   network->bssid,
			   ieee80211_is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");

		memcpy(target, network, sizeof(*target));
		list_add_tail(&target->list, &ieee->network_list);
		if (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE)
			rtllib_softmac_new_net(ieee, network);
	} else {
		netdev_dbg(ieee->dev, "Updating '%s' ( %pM) via %s.\n",
			   escape_essid(target->ssid, target->ssid_len),
			   target->bssid,
			   ieee80211_is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");

		/* we have an entry and we are going to update it. But this
		 *  entry may be already expired. In this case we do the same
		 * as we found a new net and call the new_net handler
		 */
		renew = !time_after(target->last_scanned + ieee->scan_age,
				    jiffies);
		if ((!target->ssid_len) &&
		    (((network->ssid_len > 0) && (target->hidden_ssid_len == 0))
		    || ((ieee->current_network.ssid_len == network->ssid_len) &&
		    (strncmp(ieee->current_network.ssid, network->ssid,
		    network->ssid_len) == 0) &&
		    (ieee->link_state == MAC80211_NOLINK))))
			renew = 1;
		update_network(ieee, target, network);
		if (renew && (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE))
			rtllib_softmac_new_net(ieee, network);
	}

	spin_unlock_irqrestore(&ieee->lock, flags);
	if (ieee80211_is_beacon(frame_ctl) &&
	    is_same_network(&ieee->current_network, network,
	    (network->ssid_len ? 1 : 0)) &&
	    (ieee->link_state == MAC80211_LINKED)) {
		ieee->handle_beacon(ieee->dev, beacon, &ieee->current_network);
	}
free_network:
	kfree(network);
}

static void rtllib_rx_mgt(struct rtllib_device *ieee,
			  struct sk_buff *skb,
			  struct rtllib_rx_stats *stats)
{
	struct ieee80211_hdr *header = (struct ieee80211_hdr *)skb->data;

	if (!ieee80211_is_probe_resp(header->frame_control) &&
	    (!ieee80211_is_beacon(header->frame_control)))
		ieee->last_rx_ps_time = jiffies;

	if (ieee80211_is_beacon(header->frame_control)) {
		netdev_dbg(ieee->dev, "received BEACON\n");
		rtllib_process_probe_response(
				ieee, (struct rtllib_probe_response *)header,
				stats);

		if (ieee->sta_sleep || (ieee->ps != RTLLIB_PS_DISABLED &&
		    ieee->iw_mode == IW_MODE_INFRA &&
		    ieee->link_state == MAC80211_LINKED))
			schedule_work(&ieee->ps_task);
	} else if (ieee80211_is_probe_resp(header->frame_control)) {
		netdev_dbg(ieee->dev, "received PROBE RESPONSE\n");
		rtllib_process_probe_response(ieee, (struct rtllib_probe_response *)header,
					      stats);
	}
}