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/* pptp.h: packet structures and magic constants for the PPTP protocol
* C. Scott Ananian <cananian@alumni.princeton.edu>
*
* $Id: pptp_msg.h,v 1.4 2008/02/19 05:05:03 quozl Exp $
*/
#ifndef INC_PPTP_H
#define INC_PPTP_H
/* Grab definitions of int16, int32, etc. */
#include <sys/types.h>
#include "pptp_compat.h"
/* define "portable" htons, etc. */
#define hton8(x) (x)
#define ntoh8(x) (x)
#define hton16(x) htons(x)
#define ntoh16(x) ntohs(x)
#define hton32(x) htonl(x)
#define ntoh32(x) ntohl(x)
/* PPTP magic numbers: ----------------------------------------- */
#define PPTP_MAGIC 0x1A2B3C4D /* Magic cookie for PPTP datagrams */
#define PPTP_PORT 1723 /* PPTP TCP port number */
#define PPTP_PROTO 47 /* PPTP IP protocol number */
/* Control Connection Message Types: --------------------------- */
#define PPTP_MESSAGE_CONTROL 1
#define PPTP_MESSAGE_MANAGE 2
/* Control Message Types: -------------------------------------- */
/* (Control Connection Management) */
#define PPTP_START_CTRL_CONN_RQST 1
#define PPTP_START_CTRL_CONN_RPLY 2
#define PPTP_STOP_CTRL_CONN_RQST 3
#define PPTP_STOP_CTRL_CONN_RPLY 4
#define PPTP_ECHO_RQST 5
#define PPTP_ECHO_RPLY 6
/* (Call Management) */
#define PPTP_OUT_CALL_RQST 7
#define PPTP_OUT_CALL_RPLY 8
#define PPTP_IN_CALL_RQST 9
#define PPTP_IN_CALL_RPLY 10
#define PPTP_IN_CALL_CONNECT 11
#define PPTP_CALL_CLEAR_RQST 12
#define PPTP_CALL_CLEAR_NTFY 13
/* (Error Reporting) */
#define PPTP_WAN_ERR_NTFY 14
/* (PPP Session Control) */
#define PPTP_SET_LINK_INFO 15
/* PPTP version information: --------------------------------------*/
#define PPTP_VERSION_STRING "1.00"
#define PPTP_VERSION 0x100
#define PPTP_FIRMWARE_STRING "0.01"
#define PPTP_FIRMWARE_VERSION 0x001
/* PPTP capabilities: ---------------------------------------------*/
/* (Framing capabilities for msg sender) */
#define PPTP_FRAME_ASYNC 1
#define PPTP_FRAME_SYNC 2
#define PPTP_FRAME_ANY 3
/* (Bearer capabilities for msg sender) */
#define PPTP_BEARER_ANALOG 1
#define PPTP_BEARER_DIGITAL 2
#define PPTP_BEARER_ANY 3
#define PPTP_RESULT_GENERAL_ERROR 2
/* (Reasons to close a connection) */
#define PPTP_STOP_NONE 1 /* no good reason */
#define PPTP_STOP_PROTOCOL 2 /* can't support peer's protocol version */
#define PPTP_STOP_LOCAL_SHUTDOWN 3 /* requester is being shut down */
/* PPTP datagram structures (all data in network byte order): ----------*/
struct pptp_header {
u_int16_t length; /* message length in octets, including header */
u_int16_t pptp_type; /* PPTP message type. 1 for control message. */
u_int32_t magic; /* this should be PPTP_MAGIC. */
u_int16_t ctrl_type; /* Control message type (0-15) */
u_int16_t reserved0; /* reserved. MUST BE ZERO. */
};
struct pptp_start_ctrl_conn { /* for control message types 1 and 2 */
struct pptp_header header;
u_int16_t version; /* PPTP protocol version. = PPTP_VERSION */
u_int8_t result_code; /* these two fields should be zero on rqst msg*/
u_int8_t error_code; /* 0 unless result_code==2 (General Error) */
u_int32_t framing_cap; /* Framing capabilities */
u_int32_t bearer_cap; /* Bearer Capabilities */
u_int16_t max_channels; /* Maximum Channels (=0 for PNS, PAC ignores) */
u_int16_t firmware_rev; /* Firmware or Software Revision */
u_int8_t hostname[64]; /* Host Name (64 octets, zero terminated) */
u_int8_t vendor[64]; /* Vendor string (64 octets, zero term.) */
/* MS says that end of hostname/vendor fields should be filled with */
/* octets of value 0, but Win95 PPTP driver doesn't do this. */
};
struct pptp_stop_ctrl_conn { /* for control message types 3 and 4 */
struct pptp_header header;
u_int8_t reason_result; /* reason for rqst, result for rply */
u_int8_t error_code; /* MUST be 0, unless rply result==2 (general err)*/
u_int16_t reserved1; /* MUST be 0 */
};
struct pptp_echo_rqst { /* for control message type 5 */
struct pptp_header header;
u_int32_t identifier; /* arbitrary value set by sender which is used */
/* to match up reply and request */
};
struct pptp_echo_rply { /* for control message type 6 */
struct pptp_header header;
u_int32_t identifier; /* should correspond to id of rqst */
u_int8_t result_code;
u_int8_t error_code; /* =0, unless result_code==2 (general error) */
u_int16_t reserved1; /* MUST BE ZERO */
};
struct pptp_out_call_rqst { /* for control message type 7 */
struct pptp_header header;
u_int16_t call_id; /* Call ID (unique id used to multiplex data) */
u_int16_t call_sernum; /* Call Serial Number (used for logging) */
u_int32_t bps_min; /* Minimum BPS (lowest acceptable line speed) */
u_int32_t bps_max; /* Maximum BPS (highest acceptable line speed) */
u_int32_t bearer; /* Bearer type */
u_int32_t framing; /* Framing type */
u_int16_t recv_size; /* Recv. Window Size (no. of buffered packets) */
u_int16_t delay; /* Packet Processing Delay (in 1/10 sec) */
u_int16_t phone_len; /* Phone Number Length (num. of valid digits) */
u_int16_t reserved1; /* MUST BE ZERO */
u_int8_t phone_num[64]; /* Phone Number (64 octets, null term.) */
u_int8_t subaddress[64]; /* Subaddress (64 octets, null term.) */
};
struct pptp_out_call_rply { /* for control message type 8 */
struct pptp_header header;
u_int16_t call_id; /* Call ID (used to multiplex data over tunnel)*/
u_int16_t call_id_peer; /* Peer's Call ID (call_id of pptp_out_call_rqst)*/
u_int8_t result_code; /* Result Code (1 is no errors) */
u_int8_t error_code; /* Error Code (=0 unless result_code==2) */
u_int16_t cause_code; /* Cause Code (addt'l failure information) */
u_int32_t speed; /* Connect Speed (in BPS) */
u_int16_t recv_size; /* Recv. Window Size (no. of buffered packets) */
u_int16_t delay; /* Packet Processing Delay (in 1/10 sec) */
u_int32_t channel; /* Physical Channel ID (for logging) */
};
struct pptp_in_call_rqst { /* for control message type 9 */
struct pptp_header header;
u_int16_t call_id; /* Call ID (unique id used to multiplex data) */
u_int16_t call_sernum; /* Call Serial Number (used for logging) */
u_int32_t bearer; /* Bearer type */
u_int32_t channel; /* Physical Channel ID (for logging) */
u_int16_t dialed_len; /* Dialed Number Length (# of valid digits) */
u_int16_t dialing_len; /* Dialing Number Length (# of valid digits) */
u_int8_t dialed_num[64]; /* Dialed Number (64 octets, zero term.) */
u_int8_t dialing_num[64]; /* Dialing Number (64 octets, zero term.) */
u_int8_t subaddress[64]; /* Subaddress (64 octets, zero term.) */
};
struct pptp_in_call_rply { /* for control message type 10 */
struct pptp_header header;
u_int16_t call_id; /* Call ID (used to multiplex data over tunnel)*/
u_int16_t call_id_peer; /* Peer's Call ID (call_id of pptp_out_call_rqst)*/
u_int8_t result_code; /* Result Code (1 is no errors) */
u_int8_t error_code; /* Error Code (=0 unless result_code==2) */
u_int16_t recv_size; /* Recv. Window Size (no. of buffered packets) */
u_int16_t delay; /* Packet Processing Delay (in 1/10 sec) */
u_int16_t reserved1; /* MUST BE ZERO */
};
struct pptp_in_call_connect { /* for control message type 11 */
struct pptp_header header;
u_int16_t call_id_peer; /* Peer's Call ID (call_id of pptp_out_call_rqst)*/
u_int16_t reserved1; /* MUST BE ZERO */
u_int32_t speed; /* Connect Speed (in BPS) */
u_int16_t recv_size; /* Recv. Window Size (no. of buffered packets) */
u_int16_t delay; /* Packet Processing Delay (in 1/10 sec) */
u_int32_t framing; /* Framing type */
};
struct pptp_call_clear_rqst { /* for control message type 12 */
struct pptp_header header;
u_int16_t call_id; /* Call ID (used to multiplex data over tunnel)*/
u_int16_t reserved1; /* MUST BE ZERO */
};
struct pptp_call_clear_ntfy { /* for control message type 13 */
struct pptp_header header;
u_int16_t call_id; /* Call ID (used to multiplex data over tunnel)*/
u_int8_t result_code; /* Result Code */
u_int8_t error_code; /* Error Code (=0 unless result_code==2) */
u_int16_t cause_code; /* Cause Code (for ISDN, is Q.931 cause code) */
u_int16_t reserved1; /* MUST BE ZERO */
u_int8_t call_stats[128]; /* Call Statistics: 128 octets, ascii, 0-term */
};
struct pptp_wan_err_ntfy { /* for control message type 14 */
struct pptp_header header;
u_int16_t call_id_peer; /* Peer's Call ID (call_id of pptp_out_call_rqst)*/
u_int16_t reserved1; /* MUST BE ZERO */
u_int32_t crc_errors; /* CRC errors */
u_int32_t frame_errors; /* Framing errors */
u_int32_t hard_errors; /* Hardware overruns */
u_int32_t buff_errors; /* Buffer overruns */
u_int32_t time_errors; /* Time-out errors */
u_int32_t align_errors; /* Alignment errors */
};
struct pptp_set_link_info { /* for control message type 15 */
struct pptp_header header;
u_int16_t call_id_peer; /* Peer's Call ID (call_id of pptp_out_call_rqst) */
u_int16_t reserved1; /* MUST BE ZERO */
u_int32_t send_accm; /* Send ACCM (for PPP packets; default 0xFFFFFFFF)*/
u_int32_t recv_accm; /* Receive ACCM (for PPP pack.;default 0xFFFFFFFF)*/
};
/* helpful #defines: -------------------------------------------- */
#define pptp_isvalid_ctrl(header, type, length) \
(!( ( ntoh16(((struct pptp_header *)header)->length) < (length) ) || \
( ntoh16(((struct pptp_header *)header)->pptp_type) !=(type) ) || \
( ntoh32(((struct pptp_header *)header)->magic) !=PPTP_MAGIC) || \
( ntoh16(((struct pptp_header *)header)->ctrl_type) > PPTP_SET_LINK_INFO) || \
( ntoh16(((struct pptp_header *)header)->reserved0) !=0 ) ))
#define PPTP_HEADER_CTRL(type) \
{ hton16(PPTP_CTRL_SIZE(type)), \
hton16(PPTP_MESSAGE_CONTROL), \
hton32(PPTP_MAGIC), \
hton16(type), 0 }
#define PPTP_CTRL_SIZE(type) ( \
(type==PPTP_START_CTRL_CONN_RQST)?sizeof(struct pptp_start_ctrl_conn): \
(type==PPTP_START_CTRL_CONN_RPLY)?sizeof(struct pptp_start_ctrl_conn): \
(type==PPTP_STOP_CTRL_CONN_RQST )?sizeof(struct pptp_stop_ctrl_conn): \
(type==PPTP_STOP_CTRL_CONN_RPLY )?sizeof(struct pptp_stop_ctrl_conn): \
(type==PPTP_ECHO_RQST )?sizeof(struct pptp_echo_rqst): \
(type==PPTP_ECHO_RPLY )?sizeof(struct pptp_echo_rply): \
(type==PPTP_OUT_CALL_RQST )?sizeof(struct pptp_out_call_rqst): \
(type==PPTP_OUT_CALL_RPLY )?sizeof(struct pptp_out_call_rply): \
(type==PPTP_IN_CALL_RQST )?sizeof(struct pptp_in_call_rqst): \
(type==PPTP_IN_CALL_RPLY )?sizeof(struct pptp_in_call_rply): \
(type==PPTP_IN_CALL_CONNECT )?sizeof(struct pptp_in_call_connect): \
(type==PPTP_CALL_CLEAR_RQST )?sizeof(struct pptp_call_clear_rqst): \
(type==PPTP_CALL_CLEAR_NTFY )?sizeof(struct pptp_call_clear_ntfy): \
(type==PPTP_WAN_ERR_NTFY )?sizeof(struct pptp_wan_err_ntfy): \
(type==PPTP_SET_LINK_INFO )?sizeof(struct pptp_set_link_info): \
0)
#define max(a,b) (((a)>(b))?(a):(b))
#define PPTP_CTRL_SIZE_MAX ( \
max(sizeof(struct pptp_start_ctrl_conn), \
max(sizeof(struct pptp_echo_rqst), \
max(sizeof(struct pptp_echo_rply), \
max(sizeof(struct pptp_out_call_rqst), \
max(sizeof(struct pptp_out_call_rply), \
max(sizeof(struct pptp_in_call_rqst), \
max(sizeof(struct pptp_in_call_rply), \
max(sizeof(struct pptp_in_call_connect), \
max(sizeof(struct pptp_call_clear_rqst), \
max(sizeof(struct pptp_call_clear_ntfy), \
max(sizeof(struct pptp_wan_err_ntfy), \
max(sizeof(struct pptp_set_link_info), 0)))))))))))))
/* gre header structure: -------------------------------------------- */
#define PPTP_GRE_PROTO 0x880B
#define PPTP_GRE_VER 0x1
#define PPTP_GRE_FLAG_C 0x80
#define PPTP_GRE_FLAG_R 0x40
#define PPTP_GRE_FLAG_K 0x20
#define PPTP_GRE_FLAG_S 0x10
#define PPTP_GRE_FLAG_A 0x80
#define PPTP_GRE_IS_C(f) ((f)&PPTP_GRE_FLAG_C)
#define PPTP_GRE_IS_R(f) ((f)&PPTP_GRE_FLAG_R)
#define PPTP_GRE_IS_K(f) ((f)&PPTP_GRE_FLAG_K)
#define PPTP_GRE_IS_S(f) ((f)&PPTP_GRE_FLAG_S)
#define PPTP_GRE_IS_A(f) ((f)&PPTP_GRE_FLAG_A)
struct pptp_gre_header {
u_int8_t flags; /* bitfield */
u_int8_t ver; /* should be PPTP_GRE_VER (enhanced GRE) */
u_int16_t protocol; /* should be PPTP_GRE_PROTO (ppp-encaps) */
u_int16_t payload_len; /* size of ppp payload, not inc. gre header */
u_int16_t call_id; /* peer's call_id for this session */
u_int32_t seq; /* sequence number. Present if S==1 */
u_int32_t ack; /* seq number of highest packet recieved by */
/* sender in this session */
};
#endif /* INC_PPTP_H */
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