/*      $OpenBSD: pptp_local.h,v 1.5 2021/03/29 03:54:40 yasuoka Exp $  */

/*-
 * Copyright (c) 2009 Internet Initiative Japan Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
#ifndef PPTP_LOCAL_H
#define PPTP_LOCAL_H 1

#ifndef countof
#define countof(x)      (sizeof(x) / sizeof((x)[0]))
#endif

struct pptp_gre_header {
#if     BYTE_ORDER == LITTLE_ENDIAN
        uint8_t         recur:3,
                        s:1,
                        S:1,
                        K:1,
                        R:1,
                        C:1;
        uint8_t         ver:3,
                        flags:4,
                        A:1;
#else
        uint8_t         C:1,
                        R:1,
                        K:1,
                        S:1,
                        s:1,
                        recur:3;
        uint8_t         A:1,
                        flags:4,
                        ver:3;
#endif
        uint16_t        protocol_type;
        uint16_t        payload_length;
        uint16_t        call_id;
} __attribute__((__packed__));


/* Common part of the PPTP control packet */
struct pptp_ctrl_header {
        uint16_t        length;
        uint16_t        pptp_message_type;
        uint32_t        magic_cookie;
        uint16_t        control_message_type;
        uint16_t        reserved0;
} __attribute__((__packed__));

/* Start-Control-Connection-{Request,Reply} packet */
struct pptp_scc {
        struct pptp_ctrl_header header;
        uint16_t        protocol_version;
        uint8_t         result_code;
        uint8_t         error_code;
        uint32_t        framing_caps;
        uint32_t        bearer_caps;
        uint16_t        max_channels;
        uint16_t        firmware_revision;
        u_char          host_name[64];
        u_char          vendor_string[64];
} __attribute__((__packed__));

/* Outgoing-Call-Request packet */
struct pptp_ocrq {
        struct pptp_ctrl_header header;
        uint16_t        call_id;
        uint16_t        call_serial_number;
        uint32_t        maximum_bps;
        uint32_t        minimum_bps;
        uint32_t        bearer_type;
        uint32_t        framing_type;
        uint16_t        recv_winsz;
        uint16_t        packet_proccessing_delay;
        uint16_t        phone_number_length;
        uint16_t        reservied1;
        u_char          phone_number[64];
        u_char          subaddress[64];
} __attribute__((__packed__));

/* Outgoing-Call-Reply packet */
struct pptp_ocrp {
        struct pptp_ctrl_header header;
        uint16_t        call_id;
        uint16_t        peers_call_id;
        uint8_t         result_code;
        uint8_t         error_code;
        uint16_t        cause_code;
        uint32_t        connect_speed;
        uint16_t        recv_winsz;
        uint16_t        packet_proccessing_delay;
        uint32_t        physical_channel_id;
} __attribute__((__packed__));

/* Echo-Request packet */
struct pptp_echo_rq {
        struct pptp_ctrl_header header;
        uint32_t        identifier;
} __attribute__((__packed__));

/* Echo-Reply packet */
struct pptp_echo_rp {
        struct pptp_ctrl_header header;
        uint32_t        identifier;
        uint8_t         result_code;
        uint8_t         error_code;
        uint16_t        reserved1;
} __attribute__((__packed__));

/* Set-Link-Info packet */
struct pptp_sli {
        struct pptp_ctrl_header header;
        uint16_t        peers_call_id;
        uint16_t        reserved;
        uint32_t        send_accm;
        uint32_t        recv_accm;
} __attribute__((__packed__));

struct pptp_stop_ccrq {
        struct pptp_ctrl_header header;
        uint8_t         reason;
        uint8_t         reserved1;
        uint16_t        reserved2;
} __attribute__((__packed__));

struct pptp_stop_ccrp {
        struct pptp_ctrl_header header;
        uint8_t         result;
        uint8_t         error;
        uint16_t        reserved2;
} __attribute__((__packed__));


/* Call-Clear-Request packet */
struct pptp_ccr {
        struct pptp_ctrl_header header;
        uint16_t        call_id;
        uint16_t        reserved1;
} __attribute__((__packed__));

/* Call-Disconnect-Notify packet */
struct pptp_cdn {
        struct pptp_ctrl_header header;
        uint16_t        call_id;
        uint8_t         result_code;
        uint8_t         error_code;
        uint16_t        cause_code;
        uint16_t        reserved1;
        char            statistics[128];
} __attribute__((__packed__));


#define PPTP_GRE_PKT_SEQ_PRESENT        0x0001
#define PPTP_GRE_PKT_ACK_PRESENT        0x0002

#endif