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 */ 328
