

#ifndef __L2CAP_H
#define __L2CAP_H

#include <asm/unaligned.h>
#include <linux/atomic.h>


#define L2CAP_DEFAULT_MTU		672
#define L2CAP_DEFAULT_MIN_MTU		48
#define L2CAP_SIG_MTU			48	
#define L2CAP_DEFAULT_FLUSH_TO		0xFFFF
#define L2CAP_EFS_DEFAULT_FLUSH_TO	0xFFFFFFFF
#define L2CAP_DEFAULT_TX_WINDOW		63
#define L2CAP_DEFAULT_EXT_WINDOW	0x3FFF
#define L2CAP_DEFAULT_MAX_TX		3
#define L2CAP_DEFAULT_RETRANS_TO	2000    
#define L2CAP_DEFAULT_MONITOR_TO	12000   
#define L2CAP_DEFAULT_MAX_PDU_SIZE	1492    
#define L2CAP_DEFAULT_ACK_TO		200
#define L2CAP_DEFAULT_MAX_SDU_SIZE	0xFFFF
#define L2CAP_DEFAULT_SDU_ITIME		0xFFFFFFFF
#define L2CAP_DEFAULT_ACC_LAT		0xFFFFFFFF
#define L2CAP_BREDR_MAX_PAYLOAD		1019    
#define L2CAP_LE_MIN_MTU		23
#define L2CAP_ECRED_CONN_SCID_MAX	5

#define L2CAP_DISC_TIMEOUT		msecs_to_jiffies(100)
#define L2CAP_DISC_REJ_TIMEOUT		msecs_to_jiffies(5000)
#define L2CAP_ENC_TIMEOUT		msecs_to_jiffies(5000)
#define L2CAP_CONN_TIMEOUT		msecs_to_jiffies(40000)
#define L2CAP_INFO_TIMEOUT		msecs_to_jiffies(4000)
#define L2CAP_MOVE_TIMEOUT		msecs_to_jiffies(4000)
#define L2CAP_MOVE_ERTX_TIMEOUT		msecs_to_jiffies(60000)
#define L2CAP_WAIT_ACK_POLL_PERIOD	msecs_to_jiffies(200)
#define L2CAP_WAIT_ACK_TIMEOUT		msecs_to_jiffies(10000)

#define L2CAP_A2MP_DEFAULT_MTU		670


struct sockaddr_l2 {
	sa_family_t	l2_family;
	__le16		l2_psm;
	bdaddr_t	l2_bdaddr;
	__le16		l2_cid;
	__u8		l2_bdaddr_type;
};


#define L2CAP_OPTIONS	0x01
struct l2cap_options {
	__u16 omtu;
	__u16 imtu;
	__u16 flush_to;
	__u8  mode;
	__u8  fcs;
	__u8  max_tx;
	__u16 txwin_size;
};

#define L2CAP_CONNINFO	0x02
struct l2cap_conninfo {
	__u16 hci_handle;
	__u8  dev_class[3];
};

#define L2CAP_LM	0x03
#define L2CAP_LM_MASTER		0x0001
#define L2CAP_LM_AUTH		0x0002
#define L2CAP_LM_ENCRYPT	0x0004
#define L2CAP_LM_TRUSTED	0x0008
#define L2CAP_LM_RELIABLE	0x0010
#define L2CAP_LM_SECURE		0x0020
#define L2CAP_LM_FIPS		0x0040


#define L2CAP_COMMAND_REJ	0x01
#define L2CAP_CONN_REQ		0x02
#define L2CAP_CONN_RSP		0x03
#define L2CAP_CONF_REQ		0x04
#define L2CAP_CONF_RSP		0x05
#define L2CAP_DISCONN_REQ	0x06
#define L2CAP_DISCONN_RSP	0x07
#define L2CAP_ECHO_REQ		0x08
#define L2CAP_ECHO_RSP		0x09
#define L2CAP_INFO_REQ		0x0a
#define L2CAP_INFO_RSP		0x0b
#define L2CAP_CREATE_CHAN_REQ	0x0c
#define L2CAP_CREATE_CHAN_RSP	0x0d
#define L2CAP_MOVE_CHAN_REQ	0x0e
#define L2CAP_MOVE_CHAN_RSP	0x0f
#define L2CAP_MOVE_CHAN_CFM	0x10
#define L2CAP_MOVE_CHAN_CFM_RSP	0x11
#define L2CAP_CONN_PARAM_UPDATE_REQ	0x12
#define L2CAP_CONN_PARAM_UPDATE_RSP	0x13
#define L2CAP_LE_CONN_REQ	0x14
#define L2CAP_LE_CONN_RSP	0x15
#define L2CAP_LE_CREDITS	0x16
#define L2CAP_ECRED_CONN_REQ	0x17
#define L2CAP_ECRED_CONN_RSP	0x18
#define L2CAP_ECRED_RECONF_REQ	0x19
#define L2CAP_ECRED_RECONF_RSP	0x1a


#define L2CAP_FEAT_FLOWCTL	0x00000001
#define L2CAP_FEAT_RETRANS	0x00000002
#define L2CAP_FEAT_BIDIR_QOS	0x00000004
#define L2CAP_FEAT_ERTM		0x00000008
#define L2CAP_FEAT_STREAMING	0x00000010
#define L2CAP_FEAT_FCS		0x00000020
#define L2CAP_FEAT_EXT_FLOW	0x00000040
#define L2CAP_FEAT_FIXED_CHAN	0x00000080
#define L2CAP_FEAT_EXT_WINDOW	0x00000100
#define L2CAP_FEAT_UCD		0x00000200


#define L2CAP_FCS_NONE		0x00
#define L2CAP_FCS_CRC16		0x01


#define L2CAP_FC_SIG_BREDR	0x02
#define L2CAP_FC_CONNLESS	0x04
#define L2CAP_FC_A2MP		0x08
#define L2CAP_FC_ATT		0x10
#define L2CAP_FC_SIG_LE		0x20
#define L2CAP_FC_SMP_LE		0x40
#define L2CAP_FC_SMP_BREDR	0x80


#define L2CAP_CTRL_SAR			0xC000
#define L2CAP_CTRL_REQSEQ		0x3F00
#define L2CAP_CTRL_TXSEQ		0x007E
#define L2CAP_CTRL_SUPERVISE		0x000C

#define L2CAP_CTRL_RETRANS		0x0080
#define L2CAP_CTRL_FINAL		0x0080
#define L2CAP_CTRL_POLL			0x0010
#define L2CAP_CTRL_FRAME_TYPE		0x0001 

#define L2CAP_CTRL_TXSEQ_SHIFT		1
#define L2CAP_CTRL_SUPER_SHIFT		2
#define L2CAP_CTRL_POLL_SHIFT		4
#define L2CAP_CTRL_FINAL_SHIFT		7
#define L2CAP_CTRL_REQSEQ_SHIFT		8
#define L2CAP_CTRL_SAR_SHIFT		14


#define L2CAP_EXT_CTRL_TXSEQ		0xFFFC0000
#define L2CAP_EXT_CTRL_SAR		0x00030000
#define L2CAP_EXT_CTRL_SUPERVISE	0x00030000
#define L2CAP_EXT_CTRL_REQSEQ		0x0000FFFC

#define L2CAP_EXT_CTRL_POLL		0x00040000
#define L2CAP_EXT_CTRL_FINAL		0x00000002
#define L2CAP_EXT_CTRL_FRAME_TYPE	0x00000001 

#define L2CAP_EXT_CTRL_FINAL_SHIFT	1
#define L2CAP_EXT_CTRL_REQSEQ_SHIFT	2
#define L2CAP_EXT_CTRL_SAR_SHIFT	16
#define L2CAP_EXT_CTRL_SUPER_SHIFT	16
#define L2CAP_EXT_CTRL_POLL_SHIFT	18
#define L2CAP_EXT_CTRL_TXSEQ_SHIFT	18


#define L2CAP_SUPER_RR		0x00
#define L2CAP_SUPER_REJ		0x01
#define L2CAP_SUPER_RNR		0x02
#define L2CAP_SUPER_SREJ	0x03


#define L2CAP_SAR_UNSEGMENTED	0x00
#define L2CAP_SAR_START		0x01
#define L2CAP_SAR_END		0x02
#define L2CAP_SAR_CONTINUE	0x03


#define L2CAP_REJ_NOT_UNDERSTOOD	0x0000
#define L2CAP_REJ_MTU_EXCEEDED		0x0001
#define L2CAP_REJ_INVALID_CID		0x0002


struct l2cap_hdr {
	__le16     len;
	__le16     cid;
} __packed;
#define L2CAP_LEN_SIZE		2
#define L2CAP_HDR_SIZE		4
#define L2CAP_ENH_HDR_SIZE	6
#define L2CAP_EXT_HDR_SIZE	8

#define L2CAP_FCS_SIZE		2
#define L2CAP_SDULEN_SIZE	2
#define L2CAP_PSMLEN_SIZE	2
#define L2CAP_ENH_CTRL_SIZE	2
#define L2CAP_EXT_CTRL_SIZE	4

struct l2cap_cmd_hdr {
	__u8       code;
	__u8       ident;
	__le16     len;
} __packed;
#define L2CAP_CMD_HDR_SIZE	4

struct l2cap_cmd_rej_unk {
	__le16     reason;
} __packed;

struct l2cap_cmd_rej_mtu {
	__le16     reason;
	__le16     max_mtu;
} __packed;

struct l2cap_cmd_rej_cid {
	__le16     reason;
	__le16     scid;
	__le16     dcid;
} __packed;

struct l2cap_conn_req {
	__le16     psm;
	__le16     scid;
} __packed;

struct l2cap_conn_rsp {
	__le16     dcid;
	__le16     scid;
	__le16     result;
	__le16     status;
} __packed;


#define L2CAP_PSM_SDP		0x0001
#define L2CAP_PSM_RFCOMM	0x0003
#define L2CAP_PSM_3DSP		0x0021
#define L2CAP_PSM_IPSP		0x0023 

#define L2CAP_PSM_DYN_START	0x1001
#define L2CAP_PSM_DYN_END	0xffff
#define L2CAP_PSM_AUTO_END	0x10ff
#define L2CAP_PSM_LE_DYN_START  0x0080
#define L2CAP_PSM_LE_DYN_END	0x00ff


#define L2CAP_CID_SIGNALING	0x0001
#define L2CAP_CID_CONN_LESS	0x0002
#define L2CAP_CID_A2MP		0x0003
#define L2CAP_CID_ATT		0x0004
#define L2CAP_CID_LE_SIGNALING	0x0005
#define L2CAP_CID_SMP		0x0006
#define L2CAP_CID_SMP_BREDR	0x0007
#define L2CAP_CID_DYN_START	0x0040
#define L2CAP_CID_DYN_END	0xffff
#define L2CAP_CID_LE_DYN_END	0x007f


#define L2CAP_CR_SUCCESS	0x0000
#define L2CAP_CR_PEND		0x0001
#define L2CAP_CR_BAD_PSM	0x0002
#define L2CAP_CR_SEC_BLOCK	0x0003
#define L2CAP_CR_NO_MEM		0x0004
#define L2CAP_CR_BAD_AMP	0x0005
#define L2CAP_CR_INVALID_SCID	0x0006
#define L2CAP_CR_SCID_IN_USE	0x0007


#define L2CAP_CR_LE_SUCCESS		0x0000
#define L2CAP_CR_LE_BAD_PSM		0x0002
#define L2CAP_CR_LE_NO_MEM		0x0004
#define L2CAP_CR_LE_AUTHENTICATION	0x0005
#define L2CAP_CR_LE_AUTHORIZATION	0x0006
#define L2CAP_CR_LE_BAD_KEY_SIZE	0x0007
#define L2CAP_CR_LE_ENCRYPTION		0x0008
#define L2CAP_CR_LE_INVALID_SCID	0x0009
#define L2CAP_CR_LE_SCID_IN_USE		0X000A
#define L2CAP_CR_LE_UNACCEPT_PARAMS	0X000B
#define L2CAP_CR_LE_INVALID_PARAMS	0X000C


#define L2CAP_CS_NO_INFO	0x0000
#define L2CAP_CS_AUTHEN_PEND	0x0001
#define L2CAP_CS_AUTHOR_PEND	0x0002

struct l2cap_conf_req {
	__le16     dcid;
	__le16     flags;
	__u8       data[];
} __packed;

struct l2cap_conf_rsp {
	__le16     scid;
	__le16     flags;
	__le16     result;
	__u8       data[];
} __packed;

#define L2CAP_CONF_SUCCESS	0x0000
#define L2CAP_CONF_UNACCEPT	0x0001
#define L2CAP_CONF_REJECT	0x0002
#define L2CAP_CONF_UNKNOWN	0x0003
#define L2CAP_CONF_PENDING	0x0004
#define L2CAP_CONF_EFS_REJECT	0x0005


#define L2CAP_CONF_FLAG_CONTINUATION	0x0001

struct l2cap_conf_opt {
	__u8       type;
	__u8       len;
	__u8       val[];
} __packed;
#define L2CAP_CONF_OPT_SIZE	2

#define L2CAP_CONF_HINT		0x80
#define L2CAP_CONF_MASK		0x7f

#define L2CAP_CONF_MTU		0x01
#define L2CAP_CONF_FLUSH_TO	0x02
#define L2CAP_CONF_QOS		0x03
#define L2CAP_CONF_RFC		0x04
#define L2CAP_CONF_FCS		0x05
#define L2CAP_CONF_EFS		0x06
#define L2CAP_CONF_EWS		0x07

#define L2CAP_CONF_MAX_SIZE	22

struct l2cap_conf_rfc {
	__u8       mode;
	__u8       txwin_size;
	__u8       max_transmit;
	__le16     retrans_timeout;
	__le16     monitor_timeout;
	__le16     max_pdu_size;
} __packed;

#define L2CAP_MODE_BASIC	0x00
#define L2CAP_MODE_RETRANS	0x01
#define L2CAP_MODE_FLOWCTL	0x02
#define L2CAP_MODE_ERTM		0x03
#define L2CAP_MODE_STREAMING	0x04


#define L2CAP_MODE_LE_FLOWCTL	0x80
#define L2CAP_MODE_EXT_FLOWCTL	0x81

struct l2cap_conf_efs {
	__u8	id;
	__u8	stype;
	__le16	msdu;
	__le32	sdu_itime;
	__le32	acc_lat;
	__le32	flush_to;
} __packed;

#define L2CAP_SERV_NOTRAFIC	0x00
#define L2CAP_SERV_BESTEFFORT	0x01
#define L2CAP_SERV_GUARANTEED	0x02

#define L2CAP_BESTEFFORT_ID	0x01

struct l2cap_disconn_req {
	__le16     dcid;
	__le16     scid;
} __packed;

struct l2cap_disconn_rsp {
	__le16     dcid;
	__le16     scid;
} __packed;

struct l2cap_info_req {
	__le16      type;
} __packed;

struct l2cap_info_rsp {
	__le16      type;
	__le16      result;
	__u8        data[];
} __packed;

struct l2cap_create_chan_req {
	__le16      psm;
	__le16      scid;
	__u8        amp_id;
} __packed;

struct l2cap_create_chan_rsp {
	__le16      dcid;
	__le16      scid;
	__le16      result;
	__le16      status;
} __packed;

struct l2cap_move_chan_req {
	__le16      icid;
	__u8        dest_amp_id;
} __packed;

struct l2cap_move_chan_rsp {
	__le16      icid;
	__le16      result;
} __packed;

#define L2CAP_MR_SUCCESS	0x0000
#define L2CAP_MR_PEND		0x0001
#define L2CAP_MR_BAD_ID		0x0002
#define L2CAP_MR_SAME_ID	0x0003
#define L2CAP_MR_NOT_SUPP	0x0004
#define L2CAP_MR_COLLISION	0x0005
#define L2CAP_MR_NOT_ALLOWED	0x0006

struct l2cap_move_chan_cfm {
	__le16      icid;
	__le16      result;
} __packed;

#define L2CAP_MC_CONFIRMED	0x0000
#define L2CAP_MC_UNCONFIRMED	0x0001

struct l2cap_move_chan_cfm_rsp {
	__le16      icid;
} __packed;


#define L2CAP_IT_CL_MTU		0x0001
#define L2CAP_IT_FEAT_MASK	0x0002
#define L2CAP_IT_FIXED_CHAN	0x0003


#define L2CAP_IR_SUCCESS	0x0000
#define L2CAP_IR_NOTSUPP	0x0001

struct l2cap_conn_param_update_req {
	__le16      min;
	__le16      max;
	__le16      latency;
	__le16      to_multiplier;
} __packed;

struct l2cap_conn_param_update_rsp {
	__le16      result;
} __packed;


#define L2CAP_CONN_PARAM_ACCEPTED	0x0000
#define L2CAP_CONN_PARAM_REJECTED	0x0001

struct l2cap_le_conn_req {
	__le16     psm;
	__le16     scid;
	__le16     mtu;
	__le16     mps;
	__le16     credits;
} __packed;

struct l2cap_le_conn_rsp {
	__le16     dcid;
	__le16     mtu;
	__le16     mps;
	__le16     credits;
	__le16     result;
} __packed;

struct l2cap_le_credits {
	__le16     cid;
	__le16     credits;
} __packed;

#define L2CAP_ECRED_MIN_MTU		64
#define L2CAP_ECRED_MIN_MPS		64
#define L2CAP_ECRED_MAX_CID		5

struct l2cap_ecred_conn_req {
	__le16 psm;
	__le16 mtu;
	__le16 mps;
	__le16 credits;
	__le16 scid[];
} __packed;

struct l2cap_ecred_conn_rsp {
	__le16 mtu;
	__le16 mps;
	__le16 credits;
	__le16 result;
	__le16 dcid[];
};

struct l2cap_ecred_reconf_req {
	__le16 mtu;
	__le16 mps;
	__le16 scid[];
} __packed;

#define L2CAP_RECONF_SUCCESS		0x0000
#define L2CAP_RECONF_INVALID_MTU	0x0001
#define L2CAP_RECONF_INVALID_MPS	0x0002
#define L2CAP_RECONF_INVALID_CID	0x0003
#define L2CAP_RECONF_INVALID_PARAMS	0x0004

struct l2cap_ecred_reconf_rsp {
	__le16 result;
} __packed;


struct l2cap_seq_list {
	__u16	head;
	__u16	tail;
	__u16	mask;
	__u16	*list;
};

#define L2CAP_SEQ_LIST_CLEAR	0xFFFF
#define L2CAP_SEQ_LIST_TAIL	0x8000

struct l2cap_chan {
	struct l2cap_conn	*conn;
	struct hci_conn		*hs_hcon;
	struct hci_chan		*hs_hchan;
	struct kref	kref;
	atomic_t	nesting;

	__u8		state;

	bdaddr_t	dst;
	__u8		dst_type;
	bdaddr_t	src;
	__u8		src_type;
	__le16		psm;
	__le16		sport;
	__u16		dcid;
	__u16		scid;

	__u16		imtu;
	__u16		omtu;
	__u16		flush_to;
	__u8		mode;
	__u8		chan_type;
	__u8		chan_policy;

	__u8		sec_level;

	__u8		ident;

	__u8		conf_req[64];
	__u8		conf_len;
	__u8		num_conf_req;
	__u8		num_conf_rsp;

	__u8		fcs;

	__u16		tx_win;
	__u16		tx_win_max;
	__u16		ack_win;
	__u8		max_tx;
	__u16		retrans_timeout;
	__u16		monitor_timeout;
	__u16		mps;

	__u16		tx_credits;
	__u16		rx_credits;

	
	ssize_t		rx_avail;

	__u8		tx_state;
	__u8		rx_state;

	unsigned long	conf_state;
	unsigned long	conn_state;
	unsigned long	flags;

	__u8		remote_amp_id;
	__u8		local_amp_id;
	__u8		move_id;
	__u8		move_state;
	__u8		move_role;

	__u16		next_tx_seq;
	__u16		expected_ack_seq;
	__u16		expected_tx_seq;
	__u16		buffer_seq;
	__u16		srej_save_reqseq;
	__u16		last_acked_seq;
	__u16		frames_sent;
	__u16		unacked_frames;
	__u8		retry_count;
	__u16		sdu_len;
	struct sk_buff	*sdu;
	struct sk_buff	*sdu_last_frag;

	__u16		remote_tx_win;
	__u8		remote_max_tx;
	__u16		remote_mps;

	__u8		local_id;
	__u8		local_stype;
	__u16		local_msdu;
	__u32		local_sdu_itime;
	__u32		local_acc_lat;
	__u32		local_flush_to;

	__u8		remote_id;
	__u8		remote_stype;
	__u16		remote_msdu;
	__u32		remote_sdu_itime;
	__u32		remote_acc_lat;
	__u32		remote_flush_to;

	struct delayed_work	chan_timer;
	struct delayed_work	retrans_timer;
	struct delayed_work	monitor_timer;
	struct delayed_work	ack_timer;

	struct sk_buff		*tx_send_head;
	struct sk_buff_head	tx_q;
	struct sk_buff_head	srej_q;
	struct l2cap_seq_list	srej_list;
	struct l2cap_seq_list	retrans_list;

	struct list_head	list;
	struct list_head	global_l;

	void			*data;
	const struct l2cap_ops	*ops;
	struct mutex		lock;
};

struct l2cap_ops {
	char			*name;

	struct l2cap_chan	*(*new_connection) (struct l2cap_chan *chan);
	int			(*recv) (struct l2cap_chan * chan,
					 struct sk_buff *skb);
	void			(*teardown) (struct l2cap_chan *chan, int err);
	void			(*close) (struct l2cap_chan *chan);
	void			(*state_change) (struct l2cap_chan *chan,
						 int state, int err);
	void			(*ready) (struct l2cap_chan *chan);
	void			(*defer) (struct l2cap_chan *chan);
	void			(*resume) (struct l2cap_chan *chan);
	void			(*suspend) (struct l2cap_chan *chan);
	void			(*set_shutdown) (struct l2cap_chan *chan);
	long			(*get_sndtimeo) (struct l2cap_chan *chan);
	struct pid		*(*get_peer_pid) (struct l2cap_chan *chan);
	struct sk_buff		*(*alloc_skb) (struct l2cap_chan *chan,
					       unsigned long hdr_len,
					       unsigned long len, int nb);
	int			(*filter) (struct l2cap_chan * chan,
					   struct sk_buff *skb);
};

struct l2cap_conn {
	struct hci_conn		*hcon;
	struct hci_chan		*hchan;

	unsigned int		mtu;

	__u32			feat_mask;
	__u8			remote_fixed_chan;
	__u8			local_fixed_chan;

	__u8			info_state;
	__u8			info_ident;

	struct delayed_work	info_timer;

	struct sk_buff		*rx_skb;
	__u32			rx_len;
	__u8			tx_ident;
	struct mutex		ident_lock;

	struct sk_buff_head	pending_rx;
	struct work_struct	pending_rx_work;

	struct work_struct	id_addr_update_work;

	__u8			disc_reason;

	struct l2cap_chan	*smp;

	struct list_head	chan_l;
	struct mutex		chan_lock;
	struct kref		ref;
	struct list_head	users;
};

struct l2cap_user {
	struct list_head list;
	int (*probe) (struct l2cap_conn *conn, struct l2cap_user *user);
	void (*remove) (struct l2cap_conn *conn, struct l2cap_user *user);
};

#define L2CAP_INFO_CL_MTU_REQ_SENT	0x01
#define L2CAP_INFO_FEAT_MASK_REQ_SENT	0x04
#define L2CAP_INFO_FEAT_MASK_REQ_DONE	0x08

#define L2CAP_CHAN_RAW			1
#define L2CAP_CHAN_CONN_LESS		2
#define L2CAP_CHAN_CONN_ORIENTED	3
#define L2CAP_CHAN_FIXED		4


#define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)

struct l2cap_rx_busy {
	struct list_head	list;
	struct sk_buff		*skb;
};

struct l2cap_pinfo {
	struct bt_sock		bt;
	struct l2cap_chan	*chan;
	struct list_head	rx_busy;
};

enum {
	CONF_REQ_SENT,
	CONF_INPUT_DONE,
	CONF_OUTPUT_DONE,
	CONF_MTU_DONE,
	CONF_MODE_DONE,
	CONF_CONNECT_PEND,
	CONF_RECV_NO_FCS,
	CONF_STATE2_DEVICE,
	CONF_EWS_RECV,
	CONF_LOC_CONF_PEND,
	CONF_REM_CONF_PEND,
	CONF_NOT_COMPLETE,
};

#define L2CAP_CONF_MAX_CONF_REQ 2
#define L2CAP_CONF_MAX_CONF_RSP 2

enum {
	CONN_SREJ_SENT,
	CONN_WAIT_F,
	CONN_SREJ_ACT,
	CONN_SEND_PBIT,
	CONN_REMOTE_BUSY,
	CONN_LOCAL_BUSY,
	CONN_REJ_ACT,
	CONN_SEND_FBIT,
	CONN_RNR_SENT,
};


enum {
	FLAG_ROLE_SWITCH,
	FLAG_FORCE_ACTIVE,
	FLAG_FORCE_RELIABLE,
	FLAG_FLUSHABLE,
	FLAG_EXT_CTRL,
	FLAG_EFS_ENABLE,
	FLAG_DEFER_SETUP,
	FLAG_LE_CONN_REQ_SENT,
	FLAG_ECRED_CONN_REQ_SENT,
	FLAG_PENDING_SECURITY,
	FLAG_HOLD_HCI_CONN,
};


enum {
	L2CAP_NESTING_SMP,
	L2CAP_NESTING_NORMAL,
	L2CAP_NESTING_PARENT,
};

enum {
	L2CAP_TX_STATE_XMIT,
	L2CAP_TX_STATE_WAIT_F,
};

enum {
	L2CAP_RX_STATE_RECV,
	L2CAP_RX_STATE_SREJ_SENT,
	L2CAP_RX_STATE_MOVE,
	L2CAP_RX_STATE_WAIT_P,
	L2CAP_RX_STATE_WAIT_F,
};

enum {
	L2CAP_TXSEQ_EXPECTED,
	L2CAP_TXSEQ_EXPECTED_SREJ,
	L2CAP_TXSEQ_UNEXPECTED,
	L2CAP_TXSEQ_UNEXPECTED_SREJ,
	L2CAP_TXSEQ_DUPLICATE,
	L2CAP_TXSEQ_DUPLICATE_SREJ,
	L2CAP_TXSEQ_INVALID,
	L2CAP_TXSEQ_INVALID_IGNORE,
};

enum {
	L2CAP_EV_DATA_REQUEST,
	L2CAP_EV_LOCAL_BUSY_DETECTED,
	L2CAP_EV_LOCAL_BUSY_CLEAR,
	L2CAP_EV_RECV_REQSEQ_AND_FBIT,
	L2CAP_EV_RECV_FBIT,
	L2CAP_EV_RETRANS_TO,
	L2CAP_EV_MONITOR_TO,
	L2CAP_EV_EXPLICIT_POLL,
	L2CAP_EV_RECV_IFRAME,
	L2CAP_EV_RECV_RR,
	L2CAP_EV_RECV_REJ,
	L2CAP_EV_RECV_RNR,
	L2CAP_EV_RECV_SREJ,
	L2CAP_EV_RECV_FRAME,
};

enum {
	L2CAP_MOVE_ROLE_NONE,
	L2CAP_MOVE_ROLE_INITIATOR,
	L2CAP_MOVE_ROLE_RESPONDER,
};

enum {
	L2CAP_MOVE_STABLE,
	L2CAP_MOVE_WAIT_REQ,
	L2CAP_MOVE_WAIT_RSP,
	L2CAP_MOVE_WAIT_RSP_SUCCESS,
	L2CAP_MOVE_WAIT_CONFIRM,
	L2CAP_MOVE_WAIT_CONFIRM_RSP,
	L2CAP_MOVE_WAIT_LOGICAL_COMP,
	L2CAP_MOVE_WAIT_LOGICAL_CFM,
	L2CAP_MOVE_WAIT_LOCAL_BUSY,
	L2CAP_MOVE_WAIT_PREPARE,
};

void l2cap_chan_hold(struct l2cap_chan *c);
struct l2cap_chan *l2cap_chan_hold_unless_zero(struct l2cap_chan *c);
void l2cap_chan_put(struct l2cap_chan *c);

static inline void l2cap_chan_lock(struct l2cap_chan *chan)
{
	mutex_lock_nested(&chan->lock, atomic_read(&chan->nesting));
}

static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
{
	mutex_unlock(&chan->lock);
}

static inline void l2cap_set_timer(struct l2cap_chan *chan,
				   struct delayed_work *work, long timeout)
{
	BT_DBG("chan %p state %s timeout %ld", chan,
	       state_to_string(chan->state), timeout);

	
	if (!cancel_delayed_work(work))
		l2cap_chan_hold(chan);

	schedule_delayed_work(work, timeout);
}

static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
				     struct delayed_work *work)
{
	bool ret;

	
	ret = cancel_delayed_work(work);
	if (ret)
		l2cap_chan_put(chan);

	return ret;
}

#define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
#define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
#define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
#define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
#define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
		msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
#define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)

static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
{
	if (seq1 >= seq2)
		return seq1 - seq2;
	else
		return chan->tx_win_max + 1 - seq2 + seq1;
}

static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
{
	return (seq + 1) % (chan->tx_win_max + 1);
}

static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan)
{
	return NULL;
}

static inline int l2cap_chan_no_recv(struct l2cap_chan *chan, struct sk_buff *skb)
{
	return -ENOSYS;
}

static inline struct sk_buff *l2cap_chan_no_alloc_skb(struct l2cap_chan *chan,
						      unsigned long hdr_len,
						      unsigned long len, int nb)
{
	return ERR_PTR(-ENOSYS);
}

static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err)
{
}

static inline void l2cap_chan_no_close(struct l2cap_chan *chan)
{
}

static inline void l2cap_chan_no_ready(struct l2cap_chan *chan)
{
}

static inline void l2cap_chan_no_state_change(struct l2cap_chan *chan,
					      int state, int err)
{
}

static inline void l2cap_chan_no_defer(struct l2cap_chan *chan)
{
}

static inline void l2cap_chan_no_suspend(struct l2cap_chan *chan)
{
}

static inline void l2cap_chan_no_resume(struct l2cap_chan *chan)
{
}

static inline void l2cap_chan_no_set_shutdown(struct l2cap_chan *chan)
{
}

static inline long l2cap_chan_no_get_sndtimeo(struct l2cap_chan *chan)
{
	return 0;
}

extern bool disable_ertm;
extern bool enable_ecred;

int l2cap_init_sockets(void);
void l2cap_cleanup_sockets(void);
bool l2cap_is_socket(struct socket *sock);

void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan);
void __l2cap_ecred_conn_rsp_defer(struct l2cap_chan *chan);
void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);

int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
int l2cap_add_scid(struct l2cap_chan *chan,  __u16 scid);

struct l2cap_chan *l2cap_chan_create(void);
void l2cap_chan_close(struct l2cap_chan *chan, int reason);
int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
		       bdaddr_t *dst, u8 dst_type);
int l2cap_chan_reconfigure(struct l2cap_chan *chan, __u16 mtu);
int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len);
void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
void l2cap_chan_rx_avail(struct l2cap_chan *chan, ssize_t rx_avail);
int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator);
void l2cap_chan_set_defaults(struct l2cap_chan *chan);
int l2cap_ertm_init(struct l2cap_chan *chan);
void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
typedef void (*l2cap_chan_func_t)(struct l2cap_chan *chan, void *data);
void l2cap_chan_list(struct l2cap_conn *conn, l2cap_chan_func_t func,
		     void *data);
void l2cap_chan_del(struct l2cap_chan *chan, int err);
void l2cap_send_conn_req(struct l2cap_chan *chan);
void l2cap_move_start(struct l2cap_chan *chan);
void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
		       u8 status);
void __l2cap_physical_cfm(struct l2cap_chan *chan, int result);

struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn);
void l2cap_conn_put(struct l2cap_conn *conn);

int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user);
void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user);

#endif 
