nf_conntrack_pptp.h

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/* PPTP constants and structs */
#ifndef _NF_CONNTRACK_PPTP_H
#define _NF_CONNTRACK_PPTP_H

#include <linux/netfilter/nf_conntrack_common.h>

extern const char *const pptp_msg_name[];

/* state of the control session */
enum pptp_ctrlsess_state {
    PPTP_SESSION_NONE,          /* no session present */
    PPTP_SESSION_ERROR,         /* some session error */
    PPTP_SESSION_STOPREQ,           /* stop_sess request seen */
    PPTP_SESSION_REQUESTED,         /* start_sess request seen */
    PPTP_SESSION_CONFIRMED,         /* session established */
};

/* state of the call inside the control session */
enum pptp_ctrlcall_state {
    PPTP_CALL_NONE,
    PPTP_CALL_ERROR,
    PPTP_CALL_OUT_REQ,
    PPTP_CALL_OUT_CONF,
    PPTP_CALL_IN_REQ,
    PPTP_CALL_IN_REP,
    PPTP_CALL_IN_CONF,
    PPTP_CALL_CLEAR_REQ,
};

/* conntrack private data */
struct nf_ct_pptp_master {
    enum pptp_ctrlsess_state sstate;    /* session state */
    enum pptp_ctrlcall_state cstate;    /* call state */
    __be16 pac_call_id;         /* call id of PAC */
    __be16 pns_call_id;         /* call id of PNS */

    /* in pre-2.6.11 this used to be per-expect. Now it is per-conntrack
     * and therefore imposes a fixed limit on the number of maps */
    struct nf_ct_gre_keymap *keymap[IP_CT_DIR_MAX];
};

struct nf_nat_pptp {
    __be16 pns_call_id;         /* NAT'ed PNS call id */
    __be16 pac_call_id;         /* NAT'ed PAC call id */
};

#ifdef __KERNEL__

#define PPTP_CONTROL_PORT   1723

#define PPTP_PACKET_CONTROL 1
#define PPTP_PACKET_MGMT    2

#define PPTP_MAGIC_COOKIE   0x1a2b3c4d

struct pptp_pkt_hdr {
    __u16   packetLength;
    __be16  packetType;
    __be32  magicCookie;
};

/* PptpControlMessageType values */
#define PPTP_START_SESSION_REQUEST  1
#define PPTP_START_SESSION_REPLY    2
#define PPTP_STOP_SESSION_REQUEST   3
#define PPTP_STOP_SESSION_REPLY     4
#define PPTP_ECHO_REQUEST       5
#define PPTP_ECHO_REPLY         6
#define PPTP_OUT_CALL_REQUEST       7
#define PPTP_OUT_CALL_REPLY     8
#define PPTP_IN_CALL_REQUEST        9
#define PPTP_IN_CALL_REPLY      10
#define PPTP_IN_CALL_CONNECT        11
#define PPTP_CALL_CLEAR_REQUEST     12
#define PPTP_CALL_DISCONNECT_NOTIFY 13
#define PPTP_WAN_ERROR_NOTIFY       14
#define PPTP_SET_LINK_INFO      15

#define PPTP_MSG_MAX            15

/* PptpGeneralError values */
#define PPTP_ERROR_CODE_NONE        0
#define PPTP_NOT_CONNECTED      1
#define PPTP_BAD_FORMAT         2
#define PPTP_BAD_VALUE          3
#define PPTP_NO_RESOURCE        4
#define PPTP_BAD_CALLID         5
#define PPTP_REMOVE_DEVICE_ERROR    6

struct PptpControlHeader {
    __be16  messageType;
    __u16   reserved;
};

/* FramingCapability Bitmap Values */
#define PPTP_FRAME_CAP_ASYNC        0x1
#define PPTP_FRAME_CAP_SYNC     0x2

/* BearerCapability Bitmap Values */
#define PPTP_BEARER_CAP_ANALOG      0x1
#define PPTP_BEARER_CAP_DIGITAL     0x2

struct PptpStartSessionRequest {
    __be16  protocolVersion;
    __u16   reserved1;
    __be32  framingCapability;
    __be32  bearerCapability;
    __be16  maxChannels;
    __be16  firmwareRevision;
    __u8    hostName[64];
    __u8    vendorString[64];
};

/* PptpStartSessionResultCode Values */
#define PPTP_START_OK           1
#define PPTP_START_GENERAL_ERROR    2
#define PPTP_START_ALREADY_CONNECTED    3
#define PPTP_START_NOT_AUTHORIZED   4
#define PPTP_START_UNKNOWN_PROTOCOL 5

struct PptpStartSessionReply {
    __be16  protocolVersion;
    __u8    resultCode;
    __u8    generalErrorCode;
    __be32  framingCapability;
    __be32  bearerCapability;
    __be16  maxChannels;
    __be16  firmwareRevision;
    __u8    hostName[64];
    __u8    vendorString[64];
};

/* PptpStopReasons */
#define PPTP_STOP_NONE          1
#define PPTP_STOP_PROTOCOL      2
#define PPTP_STOP_LOCAL_SHUTDOWN    3

struct PptpStopSessionRequest {
    __u8    reason;
    __u8    reserved1;
    __u16   reserved2;
};

/* PptpStopSessionResultCode */
#define PPTP_STOP_OK            1
#define PPTP_STOP_GENERAL_ERROR     2

struct PptpStopSessionReply {
    __u8    resultCode;
    __u8    generalErrorCode;
    __u16   reserved1;
};

struct PptpEchoRequest {
    __be32 identNumber;
};

/* PptpEchoReplyResultCode */
#define PPTP_ECHO_OK            1
#define PPTP_ECHO_GENERAL_ERROR     2

struct PptpEchoReply {
    __be32  identNumber;
    __u8    resultCode;
    __u8    generalErrorCode;
    __u16   reserved;
};

/* PptpFramingType */
#define PPTP_ASYNC_FRAMING      1
#define PPTP_SYNC_FRAMING       2
#define PPTP_DONT_CARE_FRAMING      3

/* PptpCallBearerType */
#define PPTP_ANALOG_TYPE        1
#define PPTP_DIGITAL_TYPE       2
#define PPTP_DONT_CARE_BEARER_TYPE  3

struct PptpOutCallRequest {
    __be16  callID;
    __be16  callSerialNumber;
    __be32  minBPS;
    __be32  maxBPS;
    __be32  bearerType;
    __be32  framingType;
    __be16  packetWindow;
    __be16  packetProcDelay;
    __be16  phoneNumberLength;
    __u16   reserved1;
    __u8    phoneNumber[64];
    __u8    subAddress[64];
};

/* PptpCallResultCode */
#define PPTP_OUTCALL_CONNECT        1
#define PPTP_OUTCALL_GENERAL_ERROR  2
#define PPTP_OUTCALL_NO_CARRIER     3
#define PPTP_OUTCALL_BUSY       4
#define PPTP_OUTCALL_NO_DIAL_TONE   5
#define PPTP_OUTCALL_TIMEOUT        6
#define PPTP_OUTCALL_DONT_ACCEPT    7

struct PptpOutCallReply {
    __be16  callID;
    __be16  peersCallID;
    __u8    resultCode;
    __u8    generalErrorCode;
    __be16  causeCode;
    __be32  connectSpeed;
    __be16  packetWindow;
    __be16  packetProcDelay;
    __be32  physChannelID;
};

struct PptpInCallRequest {
    __be16  callID;
    __be16  callSerialNumber;
    __be32  callBearerType;
    __be32  physChannelID;
    __be16  dialedNumberLength;
    __be16  dialingNumberLength;
    __u8    dialedNumber[64];
    __u8    dialingNumber[64];
    __u8    subAddress[64];
};

/* PptpInCallResultCode */
#define PPTP_INCALL_ACCEPT      1
#define PPTP_INCALL_GENERAL_ERROR   2
#define PPTP_INCALL_DONT_ACCEPT     3

struct PptpInCallReply {
    __be16  callID;
    __be16  peersCallID;
    __u8    resultCode;
    __u8    generalErrorCode;
    __be16  packetWindow;
    __be16  packetProcDelay;
    __u16   reserved;
};

struct PptpInCallConnected {
    __be16  peersCallID;
    __u16   reserved;
    __be32  connectSpeed;
    __be16  packetWindow;
    __be16  packetProcDelay;
    __be32  callFramingType;
};

struct PptpClearCallRequest {
    __be16  callID;
    __u16   reserved;
};

struct PptpCallDisconnectNotify {
    __be16  callID;
    __u8    resultCode;
    __u8    generalErrorCode;
    __be16  causeCode;
    __u16   reserved;
    __u8    callStatistics[128];
};

struct PptpWanErrorNotify {
    __be16  peersCallID;
    __u16   reserved;
    __be32  crcErrors;
    __be32  framingErrors;
    __be32  hardwareOverRuns;
    __be32  bufferOverRuns;
    __be32  timeoutErrors;
    __be32  alignmentErrors;
};

struct PptpSetLinkInfo {
    __be16  peersCallID;
    __u16   reserved;
    __be32  sendAccm;
    __be32  recvAccm;
};

union pptp_ctrl_union {
    struct PptpStartSessionRequest  sreq;
    struct PptpStartSessionReply    srep;
    struct PptpStopSessionRequest   streq;
    struct PptpStopSessionReply strep;
    struct PptpOutCallRequest   ocreq;
    struct PptpOutCallReply     ocack;
    struct PptpInCallRequest    icreq;
    struct PptpInCallReply      icack;
    struct PptpInCallConnected  iccon;
    struct PptpClearCallRequest clrreq;
    struct PptpCallDisconnectNotify disc;
    struct PptpWanErrorNotify   wanerr;
    struct PptpSetLinkInfo      setlink;
};

/* crap needed for nf_conntrack_compat.h */
struct nf_conn;
struct nf_conntrack_expect;

extern int
(*nf_nat_pptp_hook_outbound)(struct sk_buff *skb,
                 struct nf_conn *ct, enum ip_conntrack_info ctinfo,
                 unsigned int protoff,
                 struct PptpControlHeader *ctlh,
                 union pptp_ctrl_union *pptpReq);

extern int
(*nf_nat_pptp_hook_inbound)(struct sk_buff *skb,
                struct nf_conn *ct, enum ip_conntrack_info ctinfo,
                unsigned int protoff,
                struct PptpControlHeader *ctlh,
                union pptp_ctrl_union *pptpReq);

extern void
(*nf_nat_pptp_hook_exp_gre)(struct nf_conntrack_expect *exp_orig,
                struct nf_conntrack_expect *exp_reply);

extern void
(*nf_nat_pptp_hook_expectfn)(struct nf_conn *ct,
                 struct nf_conntrack_expect *exp);

#endif /* __KERNEL__ */
#endif /* _NF_CONNTRACK_PPTP_H */