/* SPDX-License-Identifier: GPL-2.0 */
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/* PPTP constants and structs */
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#ifndef _NF_CONNTRACK_PPTP_H
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#define _NF_CONNTRACK_PPTP_H
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#include <linux/netfilter.h>
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#include <linux/skbuff.h>
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#include <linux/types.h>
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#include <linux/netfilter/nf_conntrack_common.h>
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#include <net/netfilter/nf_conntrack_expect.h>
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#include <uapi/linux/netfilter/nf_conntrack_tuple_common.h>
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const char *pptp_msg_name(u_int16_t msg);
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/* state of the control session */
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enum pptp_ctrlsess_state {
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PPTP_SESSION_NONE, /* no session present */
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PPTP_SESSION_ERROR, /* some session error */
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PPTP_SESSION_STOPREQ, /* stop_sess request seen */
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PPTP_SESSION_REQUESTED, /* start_sess request seen */
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PPTP_SESSION_CONFIRMED, /* session established */
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};
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/* state of the call inside the control session */
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enum pptp_ctrlcall_state {
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PPTP_CALL_NONE,
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PPTP_CALL_ERROR,
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PPTP_CALL_OUT_REQ,
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PPTP_CALL_OUT_CONF,
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PPTP_CALL_IN_REQ,
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PPTP_CALL_IN_REP,
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PPTP_CALL_IN_CONF,
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PPTP_CALL_CLEAR_REQ,
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};
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/* conntrack private data */
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struct nf_ct_pptp_master {
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enum pptp_ctrlsess_state sstate; /* session state */
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enum pptp_ctrlcall_state cstate; /* call state */
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__be16 pac_call_id; /* call id of PAC */
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__be16 pns_call_id; /* call id of PNS */
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/* in pre-2.6.11 this used to be per-expect. Now it is per-conntrack
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* and therefore imposes a fixed limit on the number of maps */
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struct nf_ct_gre_keymap *keymap[IP_CT_DIR_MAX];
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};
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struct nf_nat_pptp {
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__be16 pns_call_id; /* NAT'ed PNS call id */
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__be16 pac_call_id; /* NAT'ed PAC call id */
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};
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#define PPTP_CONTROL_PORT 1723
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#define PPTP_PACKET_CONTROL 1
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#define PPTP_PACKET_MGMT 2
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#define PPTP_MAGIC_COOKIE 0x1a2b3c4d
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struct pptp_pkt_hdr {
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__u16 packetLength;
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__be16 packetType;
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__be32 magicCookie;
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};
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/* PptpControlMessageType values */
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#define PPTP_START_SESSION_REQUEST 1
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#define PPTP_START_SESSION_REPLY 2
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#define PPTP_STOP_SESSION_REQUEST 3
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#define PPTP_STOP_SESSION_REPLY 4
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#define PPTP_ECHO_REQUEST 5
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#define PPTP_ECHO_REPLY 6
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#define PPTP_OUT_CALL_REQUEST 7
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#define PPTP_OUT_CALL_REPLY 8
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#define PPTP_IN_CALL_REQUEST 9
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#define PPTP_IN_CALL_REPLY 10
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#define PPTP_IN_CALL_CONNECT 11
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#define PPTP_CALL_CLEAR_REQUEST 12
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#define PPTP_CALL_DISCONNECT_NOTIFY 13
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#define PPTP_WAN_ERROR_NOTIFY 14
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#define PPTP_SET_LINK_INFO 15
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#define PPTP_MSG_MAX 15
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/* PptpGeneralError values */
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#define PPTP_ERROR_CODE_NONE 0
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#define PPTP_NOT_CONNECTED 1
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#define PPTP_BAD_FORMAT 2
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#define PPTP_BAD_VALUE 3
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#define PPTP_NO_RESOURCE 4
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#define PPTP_BAD_CALLID 5
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#define PPTP_REMOVE_DEVICE_ERROR 6
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struct PptpControlHeader {
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__be16 messageType;
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__u16 reserved;
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};
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/* FramingCapability Bitmap Values */
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#define PPTP_FRAME_CAP_ASYNC 0x1
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#define PPTP_FRAME_CAP_SYNC 0x2
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/* BearerCapability Bitmap Values */
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#define PPTP_BEARER_CAP_ANALOG 0x1
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#define PPTP_BEARER_CAP_DIGITAL 0x2
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struct PptpStartSessionRequest {
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__be16 protocolVersion;
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__u16 reserved1;
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__be32 framingCapability;
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__be32 bearerCapability;
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__be16 maxChannels;
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__be16 firmwareRevision;
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__u8 hostName[64];
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__u8 vendorString[64];
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};
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/* PptpStartSessionResultCode Values */
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#define PPTP_START_OK 1
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#define PPTP_START_GENERAL_ERROR 2
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#define PPTP_START_ALREADY_CONNECTED 3
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#define PPTP_START_NOT_AUTHORIZED 4
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#define PPTP_START_UNKNOWN_PROTOCOL 5
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struct PptpStartSessionReply {
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__be16 protocolVersion;
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__u8 resultCode;
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__u8 generalErrorCode;
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__be32 framingCapability;
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__be32 bearerCapability;
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__be16 maxChannels;
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__be16 firmwareRevision;
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__u8 hostName[64];
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__u8 vendorString[64];
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};
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/* PptpStopReasons */
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#define PPTP_STOP_NONE 1
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#define PPTP_STOP_PROTOCOL 2
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#define PPTP_STOP_LOCAL_SHUTDOWN 3
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struct PptpStopSessionRequest {
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__u8 reason;
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__u8 reserved1;
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__u16 reserved2;
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};
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/* PptpStopSessionResultCode */
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#define PPTP_STOP_OK 1
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#define PPTP_STOP_GENERAL_ERROR 2
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struct PptpStopSessionReply {
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__u8 resultCode;
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__u8 generalErrorCode;
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__u16 reserved1;
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};
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struct PptpEchoRequest {
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__be32 identNumber;
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};
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/* PptpEchoReplyResultCode */
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#define PPTP_ECHO_OK 1
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#define PPTP_ECHO_GENERAL_ERROR 2
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struct PptpEchoReply {
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__be32 identNumber;
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__u8 resultCode;
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__u8 generalErrorCode;
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__u16 reserved;
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};
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/* PptpFramingType */
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#define PPTP_ASYNC_FRAMING 1
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#define PPTP_SYNC_FRAMING 2
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#define PPTP_DONT_CARE_FRAMING 3
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/* PptpCallBearerType */
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#define PPTP_ANALOG_TYPE 1
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#define PPTP_DIGITAL_TYPE 2
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#define PPTP_DONT_CARE_BEARER_TYPE 3
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struct PptpOutCallRequest {
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__be16 callID;
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__be16 callSerialNumber;
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__be32 minBPS;
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__be32 maxBPS;
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__be32 bearerType;
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__be32 framingType;
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__be16 packetWindow;
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__be16 packetProcDelay;
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__be16 phoneNumberLength;
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__u16 reserved1;
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__u8 phoneNumber[64];
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__u8 subAddress[64];
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};
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/* PptpCallResultCode */
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#define PPTP_OUTCALL_CONNECT 1
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#define PPTP_OUTCALL_GENERAL_ERROR 2
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#define PPTP_OUTCALL_NO_CARRIER 3
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#define PPTP_OUTCALL_BUSY 4
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#define PPTP_OUTCALL_NO_DIAL_TONE 5
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#define PPTP_OUTCALL_TIMEOUT 6
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#define PPTP_OUTCALL_DONT_ACCEPT 7
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struct PptpOutCallReply {
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__be16 callID;
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__be16 peersCallID;
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__u8 resultCode;
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__u8 generalErrorCode;
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__be16 causeCode;
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__be32 connectSpeed;
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__be16 packetWindow;
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__be16 packetProcDelay;
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__be32 physChannelID;
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};
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struct PptpInCallRequest {
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__be16 callID;
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__be16 callSerialNumber;
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__be32 callBearerType;
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__be32 physChannelID;
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__be16 dialedNumberLength;
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__be16 dialingNumberLength;
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__u8 dialedNumber[64];
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__u8 dialingNumber[64];
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__u8 subAddress[64];
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};
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/* PptpInCallResultCode */
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#define PPTP_INCALL_ACCEPT 1
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#define PPTP_INCALL_GENERAL_ERROR 2
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#define PPTP_INCALL_DONT_ACCEPT 3
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struct PptpInCallReply {
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__be16 callID;
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__be16 peersCallID;
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__u8 resultCode;
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__u8 generalErrorCode;
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__be16 packetWindow;
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__be16 packetProcDelay;
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__u16 reserved;
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};
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struct PptpInCallConnected {
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__be16 peersCallID;
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__u16 reserved;
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__be32 connectSpeed;
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__be16 packetWindow;
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__be16 packetProcDelay;
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__be32 callFramingType;
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};
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struct PptpClearCallRequest {
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__be16 callID;
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__u16 reserved;
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};
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struct PptpCallDisconnectNotify {
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__be16 callID;
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__u8 resultCode;
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__u8 generalErrorCode;
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__be16 causeCode;
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__u16 reserved;
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__u8 callStatistics[128];
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};
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struct PptpWanErrorNotify {
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__be16 peersCallID;
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__u16 reserved;
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__be32 crcErrors;
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__be32 framingErrors;
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__be32 hardwareOverRuns;
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__be32 bufferOverRuns;
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__be32 timeoutErrors;
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__be32 alignmentErrors;
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};
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struct PptpSetLinkInfo {
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__be16 peersCallID;
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__u16 reserved;
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__be32 sendAccm;
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__be32 recvAccm;
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};
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union pptp_ctrl_union {
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struct PptpStartSessionRequest sreq;
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struct PptpStartSessionReply srep;
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struct PptpStopSessionRequest streq;
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struct PptpStopSessionReply strep;
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struct PptpOutCallRequest ocreq;
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struct PptpOutCallReply ocack;
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struct PptpInCallRequest icreq;
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struct PptpInCallReply icack;
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struct PptpInCallConnected iccon;
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struct PptpClearCallRequest clrreq;
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struct PptpCallDisconnectNotify disc;
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struct PptpWanErrorNotify wanerr;
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struct PptpSetLinkInfo setlink;
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};
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extern int
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(*nf_nat_pptp_hook_outbound)(struct sk_buff *skb,
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struct nf_conn *ct, enum ip_conntrack_info ctinfo,
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unsigned int protoff,
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struct PptpControlHeader *ctlh,
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union pptp_ctrl_union *pptpReq);
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extern int
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(*nf_nat_pptp_hook_inbound)(struct sk_buff *skb,
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struct nf_conn *ct, enum ip_conntrack_info ctinfo,
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unsigned int protoff,
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struct PptpControlHeader *ctlh,
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union pptp_ctrl_union *pptpReq);
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extern void
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(*nf_nat_pptp_hook_exp_gre)(struct nf_conntrack_expect *exp_orig,
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struct nf_conntrack_expect *exp_reply);
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extern void
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(*nf_nat_pptp_hook_expectfn)(struct nf_conn *ct,
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struct nf_conntrack_expect *exp);
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#endif /* _NF_CONNTRACK_PPTP_H */
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