l2cap.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *
 *  BlueZ - Bluetooth protocol stack for Linux
 *
 *  Copyright (C) 2000-2001  Qualcomm Incorporated
 *  Copyright (C) 2002-2003  Maxim Krasnyansky <maxk@qualcomm.com>
 *  Copyright (C) 2002-2010  Marcel Holtmann <marcel@holtmann.org>
 *  Copyright (c) 2012       Code Aurora Forum. All rights reserved.
 *
 *
 */

#ifndef __L2CAP_H
#define __L2CAP_H

#ifdef __cplusplus
extern "C" {
#endif

#include <sys/socket.h>

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

/* L2CAP socket address */
struct sockaddr_l2 {
    sa_family_t l2_family;
    unsigned short  l2_psm;
    bdaddr_t    l2_bdaddr;
    unsigned short  l2_cid;
    uint8_t     l2_bdaddr_type;
};

/* L2CAP socket options */
#define L2CAP_OPTIONS   0x01
struct l2cap_options {
    uint16_t    omtu;
    uint16_t    imtu;
    uint16_t    flush_to;
    uint8_t     mode;
    uint8_t     fcs;
    uint8_t     max_tx;
    uint16_t    txwin_size;
};

#define L2CAP_CONNINFO  0x02
struct l2cap_conninfo {
    uint16_t    hci_handle;
    uint8_t     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
#define L2CAP_CREATE_REQ    0x0c
#define L2CAP_CREATE_RSP    0x0d
#define L2CAP_MOVE_REQ      0x0e
#define L2CAP_MOVE_RSP      0x0f
#define L2CAP_MOVE_CFM      0x10
#define L2CAP_MOVE_CFM_RSP  0x11

/* L2CAP extended feature mask */
#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

/* L2CAP fixed channels */
#define L2CAP_FC_L2CAP      0x02
#define L2CAP_FC_CONNLESS   0x04
#define L2CAP_FC_A2MP       0x08

/* L2CAP structures */
typedef struct {
    uint16_t    len;
    uint16_t    cid;
} __attribute__ ((packed)) l2cap_hdr;
#define L2CAP_HDR_SIZE 4

typedef struct {
    uint8_t     code;
    uint8_t     ident;
    uint16_t    len;
} __attribute__ ((packed)) l2cap_cmd_hdr;
#define L2CAP_CMD_HDR_SIZE 4

typedef struct {
    uint16_t    reason;
} __attribute__ ((packed)) l2cap_cmd_rej;
#define L2CAP_CMD_REJ_SIZE 2

typedef struct {
    uint16_t    psm;
    uint16_t    scid;
} __attribute__ ((packed)) l2cap_conn_req;
#define L2CAP_CONN_REQ_SIZE 4

typedef struct {
    uint16_t    dcid;
    uint16_t    scid;
    uint16_t    result;
    uint16_t    status;
} __attribute__ ((packed)) l2cap_conn_rsp;
#define L2CAP_CONN_RSP_SIZE 8

/* 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

typedef struct {
    uint16_t    dcid;
    uint16_t    flags;
    uint8_t     data[0];
} __attribute__ ((packed)) l2cap_conf_req;
#define L2CAP_CONF_REQ_SIZE 4

typedef struct {
    uint16_t    scid;
    uint16_t    flags;
    uint16_t    result;
    uint8_t     data[0];
} __attribute__ ((packed)) l2cap_conf_rsp;
#define L2CAP_CONF_RSP_SIZE 6

#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

typedef struct {
    uint8_t     type;
    uint8_t     len;
    uint8_t     val[0];
} __attribute__ ((packed)) l2cap_conf_opt;
#define L2CAP_CONF_OPT_SIZE 2

#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

#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_SERVTYPE_NOTRAFFIC    0x00
#define L2CAP_SERVTYPE_BESTEFFORT   0x01
#define L2CAP_SERVTYPE_GUARANTEED   0x02

typedef struct {
    uint16_t    dcid;
    uint16_t    scid;
} __attribute__ ((packed)) l2cap_disconn_req;
#define L2CAP_DISCONN_REQ_SIZE 4

typedef struct {
    uint16_t    dcid;
    uint16_t    scid;
} __attribute__ ((packed)) l2cap_disconn_rsp;
#define L2CAP_DISCONN_RSP_SIZE 4

typedef struct {
    uint16_t    type;
} __attribute__ ((packed)) l2cap_info_req;
#define L2CAP_INFO_REQ_SIZE 2

typedef struct {
    uint16_t    type;
    uint16_t    result;
    uint8_t     data[0];
} __attribute__ ((packed)) l2cap_info_rsp;
#define L2CAP_INFO_RSP_SIZE 4

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

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

typedef struct {
    uint16_t    psm;
    uint16_t    scid;
    uint8_t     id;
} __attribute__ ((packed)) l2cap_create_req;
#define L2CAP_CREATE_REQ_SIZE 5

typedef struct {
    uint16_t    dcid;
    uint16_t    scid;
    uint16_t    result;
    uint16_t    status;
} __attribute__ ((packed)) l2cap_create_rsp;
#define L2CAP_CREATE_RSP_SIZE 8

typedef struct {
    uint16_t    icid;
    uint8_t     id;
} __attribute__ ((packed)) l2cap_move_req;
#define L2CAP_MOVE_REQ_SIZE 3

typedef struct {
    uint16_t    icid;
    uint16_t    result;
} __attribute__ ((packed)) l2cap_move_rsp;
#define L2CAP_MOVE_RSP_SIZE 4

typedef struct {
    uint16_t    icid;
    uint16_t    result;
} __attribute__ ((packed)) l2cap_move_cfm;
#define L2CAP_MOVE_CFM_SIZE 4

typedef struct {
    uint16_t    icid;
} __attribute__ ((packed)) l2cap_move_cfm_rsp;
#define L2CAP_MOVE_CFM_RSP_SIZE 2

#ifdef __cplusplus
}
#endif

#endif /* __L2CAP_H */