include/linux/netfilter/nf_conntrack_pptp.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* PPTP constants and structs */
   3 #ifndef _NF_CONNTRACK_PPTP_H
   4 #define _NF_CONNTRACK_PPTP_H
   5
   6 #include <linux/netfilter/nf_conntrack_common.h>
   7
   8 extern const char *const pptp_msg_name[];
   9
  10 /* state of the control session */
  11 enum pptp_ctrlsess_state {
  12         PPTP_SESSION_NONE,                      /* no session present */
  13         PPTP_SESSION_ERROR,                     /* some session error */
  14         PPTP_SESSION_STOPREQ,                   /* stop_sess request seen */
  15         PPTP_SESSION_REQUESTED,                 /* start_sess request seen */
  16         PPTP_SESSION_CONFIRMED,                 /* session established */
  17 };
  18
  19 /* state of the call inside the control session */
  20 enum pptp_ctrlcall_state {
  21         PPTP_CALL_NONE,
  22         PPTP_CALL_ERROR,
  23         PPTP_CALL_OUT_REQ,
  24         PPTP_CALL_OUT_CONF,
  25         PPTP_CALL_IN_REQ,
  26         PPTP_CALL_IN_REP,
  27         PPTP_CALL_IN_CONF,
  28         PPTP_CALL_CLEAR_REQ,
  29 };
  30
  31 /* conntrack private data */
  32 struct nf_ct_pptp_master {
  33         enum pptp_ctrlsess_state sstate;        /* session state */
  34         enum pptp_ctrlcall_state cstate;        /* call state */
  35         __be16 pac_call_id;                     /* call id of PAC */
  36         __be16 pns_call_id;                     /* call id of PNS */
  37
  38         /* in pre-2.6.11 this used to be per-expect. Now it is per-conntrack
  39          * and therefore imposes a fixed limit on the number of maps */
  40         struct nf_ct_gre_keymap *keymap[IP_CT_DIR_MAX];
  41 };
  42
  43 struct nf_nat_pptp {
  44         __be16 pns_call_id;                     /* NAT'ed PNS call id */
  45         __be16 pac_call_id;                     /* NAT'ed PAC call id */
  46 };
  47
  48 #ifdef __KERNEL__
  49
  50 #define PPTP_CONTROL_PORT       1723
  51
  52 #define PPTP_PACKET_CONTROL     1
  53 #define PPTP_PACKET_MGMT        2
  54
  55 #define PPTP_MAGIC_COOKIE       0x1a2b3c4d
  56
  57 struct pptp_pkt_hdr {
  58         __u16   packetLength;
  59         __be16  packetType;
  60         __be32  magicCookie;
  61 };
  62
  63 /* PptpControlMessageType values */
  64 #define PPTP_START_SESSION_REQUEST      1
  65 #define PPTP_START_SESSION_REPLY        2
  66 #define PPTP_STOP_SESSION_REQUEST       3
  67 #define PPTP_STOP_SESSION_REPLY         4
  68 #define PPTP_ECHO_REQUEST               5
  69 #define PPTP_ECHO_REPLY                 6
  70 #define PPTP_OUT_CALL_REQUEST           7
  71 #define PPTP_OUT_CALL_REPLY             8
  72 #define PPTP_IN_CALL_REQUEST            9
  73 #define PPTP_IN_CALL_REPLY              10
  74 #define PPTP_IN_CALL_CONNECT            11
  75 #define PPTP_CALL_CLEAR_REQUEST         12
  76 #define PPTP_CALL_DISCONNECT_NOTIFY     13
  77 #define PPTP_WAN_ERROR_NOTIFY           14
  78 #define PPTP_SET_LINK_INFO              15
  79
  80 #define PPTP_MSG_MAX                    15
  81
  82 /* PptpGeneralError values */
  83 #define PPTP_ERROR_CODE_NONE            0
  84 #define PPTP_NOT_CONNECTED              1
  85 #define PPTP_BAD_FORMAT                 2
  86 #define PPTP_BAD_VALUE                  3
  87 #define PPTP_NO_RESOURCE                4
  88 #define PPTP_BAD_CALLID                 5
  89 #define PPTP_REMOVE_DEVICE_ERROR        6
  90
  91 struct PptpControlHeader {
  92         __be16  messageType;
  93         __u16   reserved;
  94 };
  95
  96 /* FramingCapability Bitmap Values */
  97 #define PPTP_FRAME_CAP_ASYNC            0x1
  98 #define PPTP_FRAME_CAP_SYNC             0x2
  99
 100 /* BearerCapability Bitmap Values */
 101 #define PPTP_BEARER_CAP_ANALOG          0x1
 102 #define PPTP_BEARER_CAP_DIGITAL         0x2
 103
 104 struct PptpStartSessionRequest {
 105         __be16  protocolVersion;
 106         __u16   reserved1;
 107         __be32  framingCapability;
 108         __be32  bearerCapability;
 109         __be16  maxChannels;
 110         __be16  firmwareRevision;
 111         __u8    hostName[64];
 112         __u8    vendorString[64];
 113 };
 114
 115 /* PptpStartSessionResultCode Values */
 116 #define PPTP_START_OK                   1
 117 #define PPTP_START_GENERAL_ERROR        2
 118 #define PPTP_START_ALREADY_CONNECTED    3
 119 #define PPTP_START_NOT_AUTHORIZED       4
 120 #define PPTP_START_UNKNOWN_PROTOCOL     5
 121
 122 struct PptpStartSessionReply {
 123         __be16  protocolVersion;
 124         __u8    resultCode;
 125         __u8    generalErrorCode;
 126         __be32  framingCapability;
 127         __be32  bearerCapability;
 128         __be16  maxChannels;
 129         __be16  firmwareRevision;
 130         __u8    hostName[64];
 131         __u8    vendorString[64];
 132 };
 133
 134 /* PptpStopReasons */
 135 #define PPTP_STOP_NONE                  1
 136 #define PPTP_STOP_PROTOCOL              2
 137 #define PPTP_STOP_LOCAL_SHUTDOWN        3
 138
 139 struct PptpStopSessionRequest {
 140         __u8    reason;
 141         __u8    reserved1;
 142         __u16   reserved2;
 143 };
 144
 145 /* PptpStopSessionResultCode */
 146 #define PPTP_STOP_OK                    1
 147 #define PPTP_STOP_GENERAL_ERROR         2
 148
 149 struct PptpStopSessionReply {
 150         __u8    resultCode;
 151         __u8    generalErrorCode;
 152         __u16   reserved1;
 153 };
 154
 155 struct PptpEchoRequest {
 156         __be32 identNumber;
 157 };
 158
 159 /* PptpEchoReplyResultCode */
 160 #define PPTP_ECHO_OK                    1
 161 #define PPTP_ECHO_GENERAL_ERROR         2
 162
 163 struct PptpEchoReply {
 164         __be32  identNumber;
 165         __u8    resultCode;
 166         __u8    generalErrorCode;
 167         __u16   reserved;
 168 };
 169
 170 /* PptpFramingType */
 171 #define PPTP_ASYNC_FRAMING              1
 172 #define PPTP_SYNC_FRAMING               2
 173 #define PPTP_DONT_CARE_FRAMING          3
 174
 175 /* PptpCallBearerType */
 176 #define PPTP_ANALOG_TYPE                1
 177 #define PPTP_DIGITAL_TYPE               2
 178 #define PPTP_DONT_CARE_BEARER_TYPE      3
 179
 180 struct PptpOutCallRequest {
 181         __be16  callID;
 182         __be16  callSerialNumber;
 183         __be32  minBPS;
 184         __be32  maxBPS;
 185         __be32  bearerType;
 186         __be32  framingType;
 187         __be16  packetWindow;
 188         __be16  packetProcDelay;
 189         __be16  phoneNumberLength;
 190         __u16   reserved1;
 191         __u8    phoneNumber[64];
 192         __u8    subAddress[64];
 193 };
 194
 195 /* PptpCallResultCode */
 196 #define PPTP_OUTCALL_CONNECT            1
 197 #define PPTP_OUTCALL_GENERAL_ERROR      2
 198 #define PPTP_OUTCALL_NO_CARRIER         3
 199 #define PPTP_OUTCALL_BUSY               4
 200 #define PPTP_OUTCALL_NO_DIAL_TONE       5
 201 #define PPTP_OUTCALL_TIMEOUT            6
 202 #define PPTP_OUTCALL_DONT_ACCEPT        7
 203
 204 struct PptpOutCallReply {
 205         __be16  callID;
 206         __be16  peersCallID;
 207         __u8    resultCode;
 208         __u8    generalErrorCode;
 209         __be16  causeCode;
 210         __be32  connectSpeed;
 211         __be16  packetWindow;
 212         __be16  packetProcDelay;
 213         __be32  physChannelID;
 214 };
 215
 216 struct PptpInCallRequest {
 217         __be16  callID;
 218         __be16  callSerialNumber;
 219         __be32  callBearerType;
 220         __be32  physChannelID;
 221         __be16  dialedNumberLength;
 222         __be16  dialingNumberLength;
 223         __u8    dialedNumber[64];
 224         __u8    dialingNumber[64];
 225         __u8    subAddress[64];
 226 };
 227
 228 /* PptpInCallResultCode */
 229 #define PPTP_INCALL_ACCEPT              1
 230 #define PPTP_INCALL_GENERAL_ERROR       2
 231 #define PPTP_INCALL_DONT_ACCEPT         3
 232
 233 struct PptpInCallReply {
 234         __be16  callID;
 235         __be16  peersCallID;
 236         __u8    resultCode;
 237         __u8    generalErrorCode;
 238         __be16  packetWindow;
 239         __be16  packetProcDelay;
 240         __u16   reserved;
 241 };
 242
 243 struct PptpInCallConnected {
 244         __be16  peersCallID;
 245         __u16   reserved;
 246         __be32  connectSpeed;
 247         __be16  packetWindow;
 248         __be16  packetProcDelay;
 249         __be32  callFramingType;
 250 };
 251
 252 struct PptpClearCallRequest {
 253         __be16  callID;
 254         __u16   reserved;
 255 };
 256
 257 struct PptpCallDisconnectNotify {
 258         __be16  callID;
 259         __u8    resultCode;
 260         __u8    generalErrorCode;
 261         __be16  causeCode;
 262         __u16   reserved;
 263         __u8    callStatistics[128];
 264 };
 265
 266 struct PptpWanErrorNotify {
 267         __be16  peersCallID;
 268         __u16   reserved;
 269         __be32  crcErrors;
 270         __be32  framingErrors;
 271         __be32  hardwareOverRuns;
 272         __be32  bufferOverRuns;
 273         __be32  timeoutErrors;
 274         __be32  alignmentErrors;
 275 };
 276
 277 struct PptpSetLinkInfo {
 278         __be16  peersCallID;
 279         __u16   reserved;
 280         __be32  sendAccm;
 281         __be32  recvAccm;
 282 };
 283
 284 union pptp_ctrl_union {
 285         struct PptpStartSessionRequest  sreq;
 286         struct PptpStartSessionReply    srep;
 287         struct PptpStopSessionRequest   streq;
 288         struct PptpStopSessionReply     strep;
 289         struct PptpOutCallRequest       ocreq;
 290         struct PptpOutCallReply         ocack;
 291         struct PptpInCallRequest        icreq;
 292         struct PptpInCallReply          icack;
 293         struct PptpInCallConnected      iccon;
 294         struct PptpClearCallRequest     clrreq;
 295         struct PptpCallDisconnectNotify disc;
 296         struct PptpWanErrorNotify       wanerr;
 297         struct PptpSetLinkInfo          setlink;
 298 };
 299
 300 /* crap needed for nf_conntrack_compat.h */
 301 struct nf_conn;
 302 struct nf_conntrack_expect;
 303
 304 extern int
 305 (*nf_nat_pptp_hook_outbound)(struct sk_buff *skb,
 306                              struct nf_conn *ct, enum ip_conntrack_info ctinfo,
 307                              unsigned int protoff,
 308                              struct PptpControlHeader *ctlh,
 309                              union pptp_ctrl_union *pptpReq);
 310
 311 extern int
 312 (*nf_nat_pptp_hook_inbound)(struct sk_buff *skb,
 313                             struct nf_conn *ct, enum ip_conntrack_info ctinfo,
 314                             unsigned int protoff,
 315                             struct PptpControlHeader *ctlh,
 316                             union pptp_ctrl_union *pptpReq);
 317
 318 extern void
 319 (*nf_nat_pptp_hook_exp_gre)(struct nf_conntrack_expect *exp_orig,
 320                             struct nf_conntrack_expect *exp_reply);
 321
 322 extern void
 323 (*nf_nat_pptp_hook_expectfn)(struct nf_conn *ct,
 324                              struct nf_conntrack_expect *exp);
 325
 326 #endif /* __KERNEL__ */
 327 #endif /* _NF_CONNTRACK_PPTP_H */