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/* $OpenBSD: pptp.h,v 1.11 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_H
#define PPTP_H 1
/*
* PPTP protocol constants
*/
#define PPTP_MES_TYPE_CTRL 1
#define PPTP_MAGIC_COOKIE 0x1a2b3c4d
#define PPTP_RFC_2637_VERSION 0x0100
#ifndef PPTP_MAX_CALL
#define PPTP_MAX_CALL 8192
#endif
/* Start-Control-Connection-Request */
#define PPTP_CTRL_MES_CODE_SCCRQ 1
/* Start-Control-Connection-Reply */
#define PPTP_CTRL_MES_CODE_SCCRP 2
/* Stop-Control-Connection-Request */
#define PPTP_CTRL_MES_CODE_StopCCRQ 3
/* Stop-Control-Connection-Reply */
#define PPTP_CTRL_MES_CODE_StopCCRP 4
/* Echo-Request */
#define PPTP_CTRL_MES_CODE_ECHO_RQ 5
/* Echo-Reply */
#define PPTP_CTRL_MES_CODE_ECHO_RP 6
/* Outgoing-Call-Request */
#define PPTP_CTRL_MES_CODE_OCRQ 7
/* Outgoing-Call-Reply */
#define PPTP_CTRL_MES_CODE_OCRP 8
/* Incoming-Call-Request */
#define PPTP_CTRL_MES_CODE_ICRQ 9
/* Incoming-Call-Reply */
#define PPTP_CTRL_MES_CODE_ICRP 10
/* Incoming-Call-Connected */
#define PPTP_CTRL_MES_CODE_ICCN 11
/* Call-Clear-Request */
#define PPTP_CTRL_MES_CODE_CCR 12
/* Call-Disconnect-Notify */
#define PPTP_CTRL_MES_CODE_CDN 13
/* Set-Link-Info */
#define PPTP_CTRL_MES_CODE_SLI 15
#define PPTP_CTRL_FRAMING_ASYNC 1
#define PPTP_CTRL_FRAMING_SYNC 2
#define PPTP_CTRL_BEARER_ANALOG 1
#define PPTP_CTRL_BEARER_DIGITAL 2
/* Result Code: Start-Control-Connection-Reply */
#define PPTP_SCCRP_RESULT_SUCCESS 1
#define PPTP_SCCRP_RESULT_GENERIC_ERROR 2
#define PPTP_SCCRP_RESULT_CHANNEL_EXISTS 3
#define PPTP_SCCRP_RESULT_NOT_AUTHORIZIZED 4
#define PPTP_SCCRP_RESULT_BAD_PROTOCOL_VERSION 5
/* General Error Code (RFC 2637 2.16 pp.36) */
#define PPTP_ERROR_NONE 0
#define PPTP_ERROR_NOT_CONNECTED 1
#define PPTP_ERROR_BAD_FORMAT 2
#define PPTP_ERROR_NO_RESOURCE 3
#define PPTP_ERROR_BAD_CALL 4
#define PPTP_ERROR_PAC_ERROR 5
/* Result Code: Outgoing-Call-Reply */
#define PPTP_OCRP_RESULT_CONNECTED 1
#define PPTP_OCRP_RESULT_GENERIC_ERROR 2
#define PPTP_OCRP_RESULT_NO_CARRIER 3
#define PPTP_OCRP_RESULT_BUSY 4
#define PPTP_OCRP_RESULT_NO_DIALTONE 5
#define PPTP_OCRP_RESULT_TIMEOUT 6
#define PPTP_OCRP_RESULT_DO_NOT_ACCEPT 7
/* Result Code: Echo-Reply */
#define PPTP_ECHO_RP_RESULT_OK 1
#define PPTP_ECHO_RP_RESULT_GENERIC_ERROR 2
/* Reason code of the Stop-Control-Connection-Request */
#define PPTP_StopCCRQ_REASON_NONE 1
#define PPTP_StopCCRQ_REASON_STOP_PROTOCOL 2
#define PPTP_StopCCRQ_REASON_STOP_LOCAL_SHUTDOWN 3
/* Result code of the Stop-Control-Connection-Response */
#define PPTP_StopCCRP_RESULT_OK 1
#define PPTP_StopCCRP_RESULT_GENERIC_ERROR 2
#define PPTP_CDN_RESULT_LOST_CARRIER 1
#define PPTP_CDN_RESULT_GENRIC_ERROR 2
#define PPTP_CDN_RESULT_ADMIN_SHUTDOWN 3
#define PPTP_CDN_RESULT_REQUEST 4
/* Default TCP port number */
#define PPTPD_DEFAULT_TCP_PORT 1723
#define PPTP_GRE_PROTOCOL_TYPE 0x880b
#define PPTP_GRE_VERSION 1
/*
* Constants of the NPPPD implementation
*/
#include "pptp_conf.h"
/* pptpd status */
#define PPTPD_STATE_INIT 0
#define PPTPD_STATE_RUNNING 1
#define PPTPD_STATE_SHUTTING_DOWN 2
#define PPTPD_STATE_STOPPED 3
#define PPTPD_CONFIG_BUFSIZ 65535
#define PPTP_BACKLOG 32
#define PPTP_BUFSIZ 1024
#define PPTPD_DEFAULT_LAYER2_LABEL "PPTP"
/* pptp control state code */
#define PPTP_CTRL_STATE_IDLE 0
#define PPTP_CTRL_STATE_WAIT_CTRL_REPLY 1
#define PPTP_CTRL_STATE_ESTABLISHED 2
#define PPTP_CTRL_STATE_WAIT_STOP_REPLY 3
#define PPTP_CTRL_STATE_DISPOSING 4
#ifndef PPTPD_DEFAULT_VENDOR_NAME
#define PPTPD_DEFAULT_VENDOR_NAME ""
#endif
#ifndef PPTP_CALL_DEFAULT_MAXWINSZ
#define PPTP_CALL_DEFAULT_MAXWINSZ 64
#endif
/* Connection speed that notified by OCRP */
/* XXX: currently we use fixed value */
#ifndef PPTP_CALL_CONNECT_SPEED
#define PPTP_CALL_CONNECT_SPEED 10000000
#endif
/* Initial packet processing delay that notified by OCRP */
#ifndef PPTP_CALL_INITIAL_PPD
#define PPTP_CALL_INITIAL_PPD 0
#endif
/**
* PPTP_CALL_DELAY_LIMIT indicates how many sequence number can be rewinded
* by reordering.
*/
#define PPTP_CALL_DELAY_LIMIT 64
/* pptp call state machine */
#define PPTP_CALL_STATE_IDLE 0
#define PPTP_CALL_STATE_WAIT_CONN 1
#define PPTP_CALL_STATE_ESTABLISHED 2
#define PPTP_CALL_STATE_CLEANUP_WAIT 3
/* Timeout */
#define PPTPD_SHUTDOWN_TIMEOUT 5
#define PPTPD_IDLE_TIMEOUT 60
#define PPTP_CALL_CLEANUP_WAIT_TIME 3
#define PPTP_CTRL_DEFAULT_ECHO_INTERVAL 60
#define PPTP_CTRL_DEFAULT_ECHO_TIMEOUT 60
#define PPTP_CTRL_StopCCRP_WAIT_TIME 3
/* MAXIMUM bindable IP addresses */
#ifndef PPTP_NLISTENER
#define PPTP_NLISTENER 6
#endif
/* Utility macro */
#define pptpd_is_stopped(pptpd) \
(((pptpd)->state != PPTPD_STATE_SHUTTING_DOWN && \
(pptpd)->state != PPTPD_STATE_RUNNING)? 1 : 0)
#define pptpd_is_shutting_down(pptpd) \
(((pptpd)->state == PPTPD_STATE_SHUTTING_DOWN)? 1 : 0)
/*
* types
*/
struct _pptpd;
typedef struct _pptpd_listener {
struct event ev_sock_gre; /* GRE event context */
struct _pptpd *self;
uint16_t index;
int sock; /* listing socket */
int sock_gre; /* GRE socket */
struct sockaddr_in bind_sin; /* listing TCP address */
struct sockaddr_in bind_sin_gre; /* listing GRE address */
char tun_name[PPTP_NAME_LEN];
struct pptp_conf *conf;
} pptpd_listener;
typedef struct _pptpd {
unsigned id;
slist listener; /* list of listeners */
int state;
struct event ev_timer; /* timer event context */
slist ctrl_list; /* list of PPTP controls */
slist call_free_list; /* Free call lists */
hash_table *call_id_map; /* table to map between callid and call */
/* ipv4 networks that is permitted to connect */
uint32_t /* flags */
initialized:1;
} pptpd;
#define pptp_ctrl_sock_gre(ctrl) \
((pptpd_listener *)slist_get(&(ctrl)->pptpd->listener,\
(ctrl)->listener_index))->sock_gre
/* get listner's physical layer label from pptp_ctrl */
#define PPTP_CTRL_LISTENER_TUN_NAME(ctrl) \
((pptpd_listener *)slist_get(&(ctrl)->pptpd->listener,\
(ctrl)->listener_index))->tun_name
#define PPTP_CTRL_CONF(ctrl) \
((pptpd_listener *)slist_get(&(ctrl)->pptpd->listener, \
(ctrl)->listener_index))->conf
typedef struct _pptp_ctrl {
pptpd *pptpd; /* parents */
uint16_t listener_index;
unsigned id;
int state;
int sock;
struct sockaddr_storage peer;
struct sockaddr_storage our;
struct event ev_sock;
struct event ev_timer;
int echo_interval; /* periods between idle state to ECHO transmit */
int echo_timeout;
int send_ready; /* ready to send */
bytebuffer *recv_buf;
bytebuffer *send_buf;
slist call_list;
time_t last_snd_ctrl; /* timestamp of latest ctrl message sent */
time_t last_rcv_ctrl; /* timestamp of latest ctrl message received */
uint32_t echo_seq; /* identifier of Echo Request */
int16_t /* flags : processing I/O events */
on_io_event:1,
reserved:15;
} pptp_ctrl;
typedef struct _pptp_call {
pptp_ctrl *ctrl; /* parent */
unsigned id;
int ifidx; /* receive interface index */
int state;
unsigned peers_call_id;
void *ppp;
uint32_t snd_una; /* next ack notification */
uint32_t snd_nxt; /* next transmit sequence # */
uint32_t rcv_nxt; /* received sequence # */
uint32_t rcv_acked; /* latest acked received sequence # */
int winsz; /* current window size */
int maxwinsz; /* maximum window size */
int peers_maxwinsz;
time_t last_io;
} pptp_call;
/*
* function prototypes
*/
#ifdef __cplusplus
extern "C" {
#endif
int pptpd_init (pptpd *);
void pptpd_uninit (pptpd *);
int pptpd_assign_call (pptpd *, pptp_call *);
void pptpd_release_call (pptpd *, pptp_call *);
int pptpd_start (pptpd *);
void pptpd_stop (pptpd *);
void pptpd_stop_immediatly (pptpd *);
void pptpd_ctrl_finished_notify(pptpd *, pptp_ctrl *);
int pptpd_add_listener(pptpd *, int, struct pptp_conf *, struct sockaddr *);
pptp_ctrl *pptp_ctrl_create (void);
int pptp_ctrl_init (pptp_ctrl *);
int pptp_ctrl_start (pptp_ctrl *);
void pptp_ctrl_stop (pptp_ctrl *, int);
void pptp_ctrl_destroy (pptp_ctrl *);
void pptp_ctrl_output (pptp_ctrl *, u_char *, int);
pptp_call *pptp_call_create (void);
int pptp_call_init (pptp_call *, pptp_ctrl *);
int pptp_call_start (pptp_call *);
int pptp_call_stop (pptp_call *);
void pptp_call_destroy (pptp_call *);
void pptp_call_input (pptp_call *, int, u_char *, int);
void pptp_call_gre_input (pptp_call *, uint32_t, uint32_t, int, u_char *, int);
void pptp_call_disconnect(pptp_call *, int, int, const char *);
int pptpd_reload(pptpd *, struct pptp_confs *);
#ifdef __cplusplus
}
#endif
#endif
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