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.h>
   7 #include <linux/skbuff.h>
   8 #include <linux/types.h>
   9 #include <linux/netfilter/nf_conntrack_common.h>
  10 #include <net/netfilter/nf_conntrack_expect.h>
  11 #include <uapi/linux/netfilter/nf_conntrack_tuple_common.h>
  12
  13 const char *pptp_msg_name(u_int16_t msg);
  14
  15 /* state of the control session */
  16 enum pptp_ctrlsess_state {
  17         PPTP_SESSION_NONE,                      /* no session present */
  18         PPTP_SESSION_ERROR,                     /* some session error */
  19         PPTP_SESSION_STOPREQ,                   /* stop_sess request seen */
  20         PPTP_SESSION_REQUESTED,                 /* start_sess request seen */
  21         PPTP_SESSION_CONFIRMED,                 /* session established */
  22 };
  23
  24 /* state of the call inside the control session */
  25 enum pptp_ctrlcall_state {
  26         PPTP_CALL_NONE,
  27         PPTP_CALL_ERROR,
  28         PPTP_CALL_OUT_REQ,
  29         PPTP_CALL_OUT_CONF,
  30         PPTP_CALL_IN_REQ,
  31         PPTP_CALL_IN_REP,
  32         PPTP_CALL_IN_CONF,
  33         PPTP_CALL_CLEAR_REQ,
  34 };
  35
  36 /* conntrack private data */
  37 struct nf_ct_pptp_master {
  38         enum pptp_ctrlsess_state sstate;        /* session state */
  39         enum pptp_ctrlcall_state cstate;        /* call state */
  40         __be16 pac_call_id;                     /* call id of PAC */
  41         __be16 pns_call_id;                     /* call id of PNS */
  42
  43         /* in pre-2.6.11 this used to be per-expect. Now it is per-conntrack
  44          * and therefore imposes a fixed limit on the number of maps */
  45         struct nf_ct_gre_keymap *keymap[IP_CT_DIR_MAX];
  46 };
  47
  48 struct nf_nat_pptp {
  49         __be16 pns_call_id;                     /* NAT'ed PNS call id */
  50         __be16 pac_call_id;                     /* NAT'ed PAC call id */
  51 };
  52
  53 #define PPTP_CONTROL_PORT       1723
  54
  55 #define PPTP_PACKET_CONTROL     1
  56 #define PPTP_PACKET_MGMT        2
  57
  58 #define PPTP_MAGIC_COOKIE       0x1a2b3c4d
  59
  60 struct pptp_pkt_hdr {
  61         __u16   packetLength;
  62         __be16  packetType;
  63         __be32  magicCookie;
  64 };
  65
  66 /* PptpControlMessageType values */
  67 #define PPTP_START_SESSION_REQUEST      1
  68 #define PPTP_START_SESSION_REPLY        2
  69 #define PPTP_STOP_SESSION_REQUEST       3
  70 #define PPTP_STOP_SESSION_REPLY         4
  71 #define PPTP_ECHO_REQUEST               5
  72 #define PPTP_ECHO_REPLY                 6
  73 #define PPTP_OUT_CALL_REQUEST           7
  74 #define PPTP_OUT_CALL_REPLY             8
  75 #define PPTP_IN_CALL_REQUEST            9
  76 #define PPTP_IN_CALL_REPLY              10
  77 #define PPTP_IN_CALL_CONNECT            11
  78 #define PPTP_CALL_CLEAR_REQUEST         12
  79 #define PPTP_CALL_DISCONNECT_NOTIFY     13
  80 #define PPTP_WAN_ERROR_NOTIFY           14
  81 #define PPTP_SET_LINK_INFO              15
  82
  83 #define PPTP_MSG_MAX                    15
  84
  85 /* PptpGeneralError values */
  86 #define PPTP_ERROR_CODE_NONE            0
  87 #define PPTP_NOT_CONNECTED              1
  88 #define PPTP_BAD_FORMAT                 2
  89 #define PPTP_BAD_VALUE                  3
  90 #define PPTP_NO_RESOURCE                4
  91 #define PPTP_BAD_CALLID                 5
  92 #define PPTP_REMOVE_DEVICE_ERROR        6
  93
  94 struct PptpControlHeader {
  95         __be16  messageType;
  96         __u16   reserved;
  97 };
  98
  99 /* FramingCapability Bitmap Values */
 100 #define PPTP_FRAME_CAP_ASYNC            0x1
 101 #define PPTP_FRAME_CAP_SYNC             0x2
 102
 103 /* BearerCapability Bitmap Values */
 104 #define PPTP_BEARER_CAP_ANALOG          0x1
 105 #define PPTP_BEARER_CAP_DIGITAL         0x2
 106
 107 struct PptpStartSessionRequest {
 108         __be16  protocolVersion;
 109         __u16   reserved1;
 110         __be32  framingCapability;
 111         __be32  bearerCapability;
 112         __be16  maxChannels;
 113         __be16  firmwareRevision;
 114         __u8    hostName[64];
 115         __u8    vendorString[64];
 116 };
 117
 118 /* PptpStartSessionResultCode Values */
 119 #define PPTP_START_OK                   1
 120 #define PPTP_START_GENERAL_ERROR        2
 121 #define PPTP_START_ALREADY_CONNECTED    3
 122 #define PPTP_START_NOT_AUTHORIZED       4
 123 #define PPTP_START_UNKNOWN_PROTOCOL     5
 124
 125 struct PptpStartSessionReply {
 126         __be16  protocolVersion;
 127         __u8    resultCode;
 128         __u8    generalErrorCode;
 129         __be32  framingCapability;
 130         __be32  bearerCapability;
 131         __be16  maxChannels;
 132         __be16  firmwareRevision;
 133         __u8    hostName[64];
 134         __u8    vendorString[64];
 135 };
 136
 137 /* PptpStopReasons */
 138 #define PPTP_STOP_NONE                  1
 139 #define PPTP_STOP_PROTOCOL              2
 140 #define PPTP_STOP_LOCAL_SHUTDOWN        3
 141
 142 struct PptpStopSessionRequest {
 143         __u8    reason;
 144         __u8    reserved1;
 145         __u16   reserved2;
 146 };
 147
 148 /* PptpStopSessionResultCode */
 149 #define PPTP_STOP_OK                    1
 150 #define PPTP_STOP_GENERAL_ERROR         2
 151
 152 struct PptpStopSessionReply {
 153         __u8    resultCode;
 154         __u8    generalErrorCode;
 155         __u16   reserved1;
 156 };
 157
 158 struct PptpEchoRequest {
 159         __be32 identNumber;
 160 };
 161
 162 /* PptpEchoReplyResultCode */
 163 #define PPTP_ECHO_OK                    1
 164 #define PPTP_ECHO_GENERAL_ERROR         2
 165
 166 struct PptpEchoReply {
 167         __be32  identNumber;
 168         __u8    resultCode;
 169         __u8    generalErrorCode;
 170         __u16   reserved;
 171 };
 172
 173 /* PptpFramingType */
 174 #define PPTP_ASYNC_FRAMING              1
 175 #define PPTP_SYNC_FRAMING               2
 176 #define PPTP_DONT_CARE_FRAMING          3
 177
 178 /* PptpCallBearerType */
 179 #define PPTP_ANALOG_TYPE                1
 180 #define PPTP_DIGITAL_TYPE               2
 181 #define PPTP_DONT_CARE_BEARER_TYPE      3
 182
 183 struct PptpOutCallRequest {
 184         __be16  callID;
 185         __be16  callSerialNumber;
 186         __be32  minBPS;
 187         __be32  maxBPS;
 188         __be32  bearerType;
 189         __be32  framingType;
 190         __be16  packetWindow;
 191         __be16  packetProcDelay;
 192         __be16  phoneNumberLength;
 193         __u16   reserved1;
 194         __u8    phoneNumber[64];
 195         __u8    subAddress[64];
 196 };
 197
 198 /* PptpCallResultCode */
 199 #define PPTP_OUTCALL_CONNECT            1
 200 #define PPTP_OUTCALL_GENERAL_ERROR      2
 201 #define PPTP_OUTCALL_NO_CARRIER         3
 202 #define PPTP_OUTCALL_BUSY               4
 203 #define PPTP_OUTCALL_NO_DIAL_TONE       5
 204 #define PPTP_OUTCALL_TIMEOUT            6
 205 #define PPTP_OUTCALL_DONT_ACCEPT        7
 206
 207 struct PptpOutCallReply {
 208         __be16  callID;
 209         __be16  peersCallID;
 210         __u8    resultCode;
 211         __u8    generalErrorCode;
 212         __be16  causeCode;
 213         __be32  connectSpeed;
 214         __be16  packetWindow;
 215         __be16  packetProcDelay;
 216         __be32  physChannelID;
 217 };
 218
 219 struct PptpInCallRequest {
 220         __be16  callID;
 221         __be16  callSerialNumber;
 222         __be32  callBearerType;
 223         __be32  physChannelID;
 224         __be16  dialedNumberLength;
 225         __be16  dialingNumberLength;
 226         __u8    dialedNumber[64];
 227         __u8    dialingNumber[64];
 228         __u8    subAddress[64];
 229 };
 230
 231 /* PptpInCallResultCode */
 232 #define PPTP_INCALL_ACCEPT              1
 233 #define PPTP_INCALL_GENERAL_ERROR       2
 234 #define PPTP_INCALL_DONT_ACCEPT         3
 235
 236 struct PptpInCallReply {
 237         __be16  callID;
 238         __be16  peersCallID;
 239         __u8    resultCode;
 240         __u8    generalErrorCode;
 241         __be16  packetWindow;
 242         __be16  packetProcDelay;
 243         __u16   reserved;
 244 };
 245
 246 struct PptpInCallConnected {
 247         __be16  peersCallID;
 248         __u16   reserved;
 249         __be32  connectSpeed;
 250         __be16  packetWindow;
 251         __be16  packetProcDelay;
 252         __be32  callFramingType;
 253 };
 254
 255 struct PptpClearCallRequest {
 256         __be16  callID;
 257         __u16   reserved;
 258 };
 259
 260 struct PptpCallDisconnectNotify {
 261         __be16  callID;
 262         __u8    resultCode;
 263         __u8    generalErrorCode;
 264         __be16  causeCode;
 265         __u16   reserved;
 266         __u8    callStatistics[128];
 267 };
 268
 269 struct PptpWanErrorNotify {
 270         __be16  peersCallID;
 271         __u16   reserved;
 272         __be32  crcErrors;
 273         __be32  framingErrors;
 274         __be32  hardwareOverRuns;
 275         __be32  bufferOverRuns;
 276         __be32  timeoutErrors;
 277         __be32  alignmentErrors;
 278 };
 279
 280 struct PptpSetLinkInfo {
 281         __be16  peersCallID;
 282         __u16   reserved;
 283         __be32  sendAccm;
 284         __be32  recvAccm;
 285 };
 286
 287 union pptp_ctrl_union {
 288         struct PptpStartSessionRequest  sreq;
 289         struct PptpStartSessionReply    srep;
 290         struct PptpStopSessionRequest   streq;
 291         struct PptpStopSessionReply     strep;
 292         struct PptpOutCallRequest       ocreq;
 293         struct PptpOutCallReply         ocack;
 294         struct PptpInCallRequest        icreq;
 295         struct PptpInCallReply          icack;
 296         struct PptpInCallConnected      iccon;
 297         struct PptpClearCallRequest     clrreq;
 298         struct PptpCallDisconnectNotify disc;
 299         struct PptpWanErrorNotify       wanerr;
 300         struct PptpSetLinkInfo          setlink;
 301 };
 302
 303 extern int
 304 (*nf_nat_pptp_hook_outbound)(struct sk_buff *skb,
 305                              struct nf_conn *ct, enum ip_conntrack_info ctinfo,
 306                              unsigned int protoff,
 307                              struct PptpControlHeader *ctlh,
 308                              union pptp_ctrl_union *pptpReq);
 309
 310 extern int
 311 (*nf_nat_pptp_hook_inbound)(struct sk_buff *skb,
 312                             struct nf_conn *ct, enum ip_conntrack_info ctinfo,
 313                             unsigned int protoff,
 314                             struct PptpControlHeader *ctlh,
 315                             union pptp_ctrl_union *pptpReq);
 316
 317 extern void
 318 (*nf_nat_pptp_hook_exp_gre)(struct nf_conntrack_expect *exp_orig,
 319                             struct nf_conntrack_expect *exp_reply);
 320
 321 extern void
 322 (*nf_nat_pptp_hook_expectfn)(struct nf_conn *ct,
 323                              struct nf_conntrack_expect *exp);
 324
 325 #endif /* _NF_CONNTRACK_PPTP_H */