include/net/bluetooth/l2cap.h

/* 
   BlueZ - Bluetooth protocol stack for Linux
   Copyright (C) 2000-2001 Qualcomm Incorporated

   Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 
   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 
   SOFTWARE IS DISCLAIMED.
*/

#ifndef __L2CAP_H
#define __L2CAP_H

/* L2CAP defaults */
#define L2CAP_DEFAULT_MTU	672
#define L2CAP_DEFAULT_FLUSH_TO	0xFFFF

#define L2CAP_CONN_TIMEOUT	(40000) /* 40 seconds */
#define L2CAP_INFO_TIMEOUT	(4000)  /*  4 seconds */

/* L2CAP socket address */
struct sockaddr_l2 {
	sa_family_t	l2_family;
	__le16		l2_psm;
	bdaddr_t	l2_bdaddr;
	__le16		l2_cid;
};

/* L2CAP socket options */
#define L2CAP_OPTIONS	0x01
struct l2cap_options {
	__u16 omtu;
	__u16 imtu;
	__u16 flush_to;
	__u8  mode;
};

#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

/* L2CAP command codes */
#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

/* L2CAP structures */
struct l2cap_hdr {
	__le16     len;
	__le16     cid;
} __attribute__ ((packed));
#define L2CAP_HDR_SIZE		4

struct l2cap_cmd_hdr {
	__u8       code;
	__u8       ident;
	__le16     len;
} __attribute__ ((packed));
#define L2CAP_CMD_HDR_SIZE	4

struct l2cap_cmd_rej {
	__le16     reason;
} __attribute__ ((packed));

struct l2cap_conn_req {
	__le16     psm;
	__le16     scid;
} __attribute__ ((packed));

struct l2cap_conn_rsp {
	__le16     dcid;
	__le16     scid;
	__le16     result;
	__le16     status;
} __attribute__ ((packed));

/* channel indentifier */
#define L2CAP_CID_SIGNALING	0x0001
#define L2CAP_CID_CONN_LESS	0x0002
#define L2CAP_CID_DYN_START	0x0040
#define L2CAP_CID_DYN_END	0xffff

/* connect result */
#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

/* connect status */
#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[0];
} __attribute__ ((packed));

struct l2cap_conf_rsp {
	__le16     scid;
	__le16     flags;
	__le16     result;
	__u8       data[0];
} __attribute__ ((packed));

#define L2CAP_CONF_SUCCESS	0x0000
#define L2CAP_CONF_UNACCEPT	0x0001
#define L2CAP_CONF_REJECT	0x0002
#define L2CAP_CONF_UNKNOWN	0x0003

struct l2cap_conf_opt {
	__u8       type;
	__u8       len;
	__u8       val[0];
} __attribute__ ((packed));
#define L2CAP_CONF_OPT_SIZE	2

#define L2CAP_CONF_HINT		0x80

#define L2CAP_CONF_MTU		0x01
#define L2CAP_CONF_FLUSH_TO	0x02
#define L2CAP_CONF_QOS		0x03
#define L2CAP_CONF_RFC		0x04

#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;
} __attribute__ ((packed));

#define L2CAP_MODE_BASIC	0x00
#define L2CAP_MODE_RETRANS	0x01
#define L2CAP_MODE_FLOWCTL	0x02

struct l2cap_disconn_req {
	__le16     dcid;
	__le16     scid;
} __attribute__ ((packed));

struct l2cap_disconn_rsp {
	__le16     dcid;
	__le16     scid;
} __attribute__ ((packed));

struct l2cap_info_req {
	__le16      type;
} __attribute__ ((packed));

struct l2cap_info_rsp {
	__le16      type;
	__le16      result;
	__u8        data[0];
} __attribute__ ((packed));

/* info type */
#define L2CAP_IT_CL_MTU     0x0001
#define L2CAP_IT_FEAT_MASK  0x0002
#define L2CAP_IT_FIXED_CHAN 0x0003

/* info result */
#define L2CAP_IR_SUCCESS    0x0000
#define L2CAP_IR_NOTSUPP    0x0001

/* ----- L2CAP connections ----- */
struct l2cap_chan_list {
	struct sock	*head;
	rwlock_t	lock;
	long		num;
};

struct l2cap_conn {
	struct hci_conn	*hcon;

	bdaddr_t	*dst;
	bdaddr_t	*src;

	unsigned int	mtu;

	__u32		feat_mask;

	__u8		info_state;
	__u8		info_ident;

	struct timer_list info_timer;

	spinlock_t	lock;

	struct sk_buff *rx_skb;
	__u32		rx_len;
	__u8		rx_ident;
	__u8		tx_ident;

	__u8		disc_reason;

	struct l2cap_chan_list chan_list;
};

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

/* ----- L2CAP channel and socket info ----- */
#define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)

struct l2cap_pinfo {
	struct bt_sock	bt;
	__le16		psm;
	__u16		dcid;
	__u16		scid;

	__u16		imtu;
	__u16		omtu;
	__u16		flush_to;
	__u8            sec_level;
	__u8		role_switch;
	__u8            force_reliable;

	__u8		conf_req[64];
	__u8		conf_len;
	__u8		conf_state;
	__u8		conf_retry;

	__u8		ident;

	__le16		sport;

	struct l2cap_conn	*conn;
	struct sock		*next_c;
	struct sock		*prev_c;
};

#define L2CAP_CONF_REQ_SENT	0x01
#define L2CAP_CONF_INPUT_DONE	0x02
#define L2CAP_CONF_OUTPUT_DONE	0x04
#define L2CAP_CONF_CONNECT_PEND	0x80

#define L2CAP_CONF_MAX_RETRIES	2

void l2cap_load(void);

#endif /* __L2CAP_H */