release/src/router/tcpdump/isakmp.h

   1 /*
   2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 /* YIPS @(#)$Id: isakmp.h,v 1.12 2007-11-24 18:13:33 mcr Exp $ */
  30
  31 /* refer to RFC 2408 */
  32
  33 /* must include <netinet/in.h> */
  34
  35 #if !defined(_ISAKMP_H_)
  36 #define _ISAKMP_H_
  37
  38 typedef u_char cookie_t[8];
  39 typedef u_char msgid_t[4];
  40
  41 typedef struct { /* i_cookie + r_cookie */
  42         cookie_t i_ck;
  43         cookie_t r_ck;
  44 } isakmp_index;
  45
  46 #define INITIATOR       1
  47 #define RESPONDER       2
  48
  49 #define PORT_ISAKMP 500
  50
  51 #define GENERATE  1
  52 #define VALIDATE  0
  53
  54 /* Phase of oakley definition */
  55 /*
  56   0000 0000 0000 0000
  57        |    |||| ||||
  58        |    |||| ++++--> negosiation number in phase
  59        |    ++++-------> phase number
  60        +---------------> expire ?
  61  */
  62 #define ISAKMP_PH1      0x0010
  63 #define ISAKMP_PH2      0x0020
  64 #define ISAKMP_EXPIRED  0x0100
  65
  66 #define ISAKMP_NGP_0    0x0000
  67 #define ISAKMP_NGP_1    0x0001
  68 #define ISAKMP_NGP_2    0x0002
  69 #define ISAKMP_NGP_3    0x0003
  70 #define ISAKMP_NGP_4    0x0004
  71
  72 #define ISAKMP_PH1_N    (ISAKMP_PH1 | ISAKMP_NGP_0)  /* i.e. spawn */
  73 #define ISAKMP_PH1_1    (ISAKMP_PH1 | ISAKMP_NGP_1)
  74 #define ISAKMP_PH1_2    (ISAKMP_PH1 | ISAKMP_NGP_2)
  75 #define ISAKMP_PH1_3    (ISAKMP_PH1 | ISAKMP_NGP_3)
  76 #define ISAKMP_PH2_N    (ISAKMP_PH2 | ISAKMP_NGP_0)
  77 #define ISAKMP_PH2_1    (ISAKMP_PH2 | ISAKMP_NGP_1)
  78 #define ISAKMP_PH2_2    (ISAKMP_PH2 | ISAKMP_NGP_2)
  79 #define ISAKMP_PH2_3    (ISAKMP_PH2 | ISAKMP_NGP_3)
  80
  81 #define ISAKMP_TIMER_DEFAULT     10 /* seconds */
  82 #define ISAKMP_TRY_DEFAULT        3 /* times */
  83
  84 /* 3.1 ISAKMP Header Format (IKEv1 and IKEv2)
  85          0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  86         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  87         !                          Initiator                            !
  88         !                            Cookie                             !
  89         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  90         !                          Responder                            !
  91         !                            Cookie                             !
  92         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  93         !  Next Payload ! MjVer ! MnVer ! Exchange Type !     Flags     !
  94         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  95         !                          Message ID                           !
  96         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  97         !                            Length                             !
  98         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  99 */
 100 struct isakmp {
 101         cookie_t i_ck;          /* Initiator Cookie */
 102         cookie_t r_ck;          /* Responder Cookie */
 103         u_int8_t np;            /* Next Payload Type */
 104         u_int8_t vers;
 105 #define ISAKMP_VERS_MAJOR       0xf0
 106 #define ISAKMP_VERS_MAJOR_SHIFT 4
 107 #define ISAKMP_VERS_MINOR       0x0f
 108 #define ISAKMP_VERS_MINOR_SHIFT 0
 109         u_int8_t etype;         /* Exchange Type */
 110         u_int8_t flags;         /* Flags */
 111         msgid_t msgid;
 112         u_int32_t len;          /* Length */
 113 };
 114
 115 /* Next Payload Type */
 116 #define ISAKMP_NPTYPE_NONE   0 /* NONE*/
 117 #define ISAKMP_NPTYPE_SA     1 /* Security Association */
 118 #define ISAKMP_NPTYPE_P      2 /* Proposal */
 119 #define ISAKMP_NPTYPE_T      3 /* Transform */
 120 #define ISAKMP_NPTYPE_KE     4 /* Key Exchange */
 121 #define ISAKMP_NPTYPE_ID     5 /* Identification */
 122 #define ISAKMP_NPTYPE_CERT   6 /* Certificate */
 123 #define ISAKMP_NPTYPE_CR     7 /* Certificate Request */
 124 #define ISAKMP_NPTYPE_HASH   8 /* Hash */
 125 #define ISAKMP_NPTYPE_SIG    9 /* Signature */
 126 #define ISAKMP_NPTYPE_NONCE 10 /* Nonce */
 127 #define ISAKMP_NPTYPE_N     11 /* Notification */
 128 #define ISAKMP_NPTYPE_D     12 /* Delete */
 129 #define ISAKMP_NPTYPE_VID   13 /* Vendor ID */
 130 #define ISAKMP_NPTYPE_v2E   46 /* v2 Encrypted payload */
 131
 132 #define IKEv1_MAJOR_VERSION  1
 133 #define IKEv1_MINOR_VERSION  0
 134
 135 #define IKEv2_MAJOR_VERSION  2
 136 #define IKEv2_MINOR_VERSION  0
 137
 138 /* Exchange Type */
 139 #define ISAKMP_ETYPE_NONE   0 /* NONE */
 140 #define ISAKMP_ETYPE_BASE   1 /* Base */
 141 #define ISAKMP_ETYPE_IDENT  2 /* Identity Proteciton */
 142 #define ISAKMP_ETYPE_AUTH   3 /* Authentication Only */
 143 #define ISAKMP_ETYPE_AGG    4 /* Aggressive */
 144 #define ISAKMP_ETYPE_INF    5 /* Informational */
 145
 146 /* Flags */
 147 #define ISAKMP_FLAG_E 0x01 /* Encryption Bit */
 148 #define ISAKMP_FLAG_C 0x02 /* Commit Bit */
 149 #define ISAKMP_FLAG_extra 0x04
 150
 151 /* IKEv2 */
 152 #define ISAKMP_FLAG_I (1 << 3)  /* (I)nitiator */
 153 #define ISAKMP_FLAG_V (1 << 4)  /* (V)ersion   */
 154 #define ISAKMP_FLAG_R (1 << 5)  /* (R)esponse  */
 155
 156
 157 /* 3.2 Payload Generic Header
 158          0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 159         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 160         ! Next Payload  !   RESERVED    !         Payload Length        !
 161         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 162 */
 163 struct isakmp_gen {
 164         u_int8_t  np;       /* Next Payload */
 165         u_int8_t  critical; /* bit 7 - critical, rest is RESERVED */
 166         u_int16_t len;      /* Payload Length */
 167 };
 168
 169 /* 3.3 Data Attributes
 170          0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 171         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 172         !A!       Attribute Type        !    AF=0  Attribute Length     !
 173         !F!                             !    AF=1  Attribute Value      !
 174         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 175         .                   AF=0  Attribute Value                       .
 176         .                   AF=1  Not Transmitted                       .
 177         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 178 */
 179 struct isakmp_data {
 180         u_int16_t type;     /* defined by DOI-spec, and Attribute Format */
 181         u_int16_t lorv;     /* if f equal 1, Attribute Length */
 182                           /* if f equal 0, Attribute Value */
 183         /* if f equal 1, Attribute Value */
 184 };
 185 #define ISAKMP_GEN_TLV 0x0000
 186 #define ISAKMP_GEN_TV  0x8000
 187         /* mask for type of attribute format */
 188 #define ISAKMP_GEN_MASK 0x8000
 189
 190 /* 3.4 Security Association Payload */
 191         /* MAY NOT be used, because of being defined in ipsec-doi. */
 192         /*
 193         If the current payload is the last in the message,
 194         then the value of the next payload field will be 0.
 195         This field MUST NOT contain the
 196         values for the Proposal or Transform payloads as they are considered
 197         part of the security association negotiation.  For example, this
 198         field would contain the value "10" (Nonce payload) in the first
 199         message of a Base Exchange (see Section 4.4) and the value "0" in the
 200         first message of an Identity Protect Exchange (see Section 4.5).
 201         */
 202 struct ikev1_pl_sa {
 203         struct isakmp_gen h;
 204         u_int32_t doi; /* Domain of Interpretation */
 205         u_int32_t sit; /* Situation */
 206 };
 207
 208 /* 3.5 Proposal Payload */
 209         /*
 210         The value of the next payload field MUST only contain the value "2"
 211         or "0".  If there are additional Proposal payloads in the message,
 212         then this field will be 2.  If the current Proposal payload is the
 213         last within the security association proposal, then this field will
 214         be 0.
 215         */
 216 struct ikev1_pl_p {
 217         struct isakmp_gen h;
 218         u_int8_t p_no;      /* Proposal # */
 219         u_int8_t prot_id;   /* Protocol */
 220         u_int8_t spi_size;  /* SPI Size */
 221         u_int8_t num_t;     /* Number of Transforms */
 222         /* SPI */
 223 };
 224
 225 /* 3.6 Transform Payload */
 226         /*
 227         The value of the next payload field MUST only contain the value "3"
 228         or "0".  If there are additional Transform payloads in the proposal,
 229         then this field will be 3.  If the current Transform payload is the
 230         last within the proposal, then this field will be 0.
 231         */
 232 struct ikev1_pl_t {
 233         struct isakmp_gen h;
 234         u_int8_t  t_no;     /* Transform # */
 235         u_int8_t  t_id;     /* Transform-Id */
 236         u_int16_t reserved; /* RESERVED2 */
 237         /* SA Attributes */
 238 };
 239
 240 /* 3.7 Key Exchange Payload */
 241 struct ikev1_pl_ke {
 242         struct isakmp_gen h;
 243         /* Key Exchange Data */
 244 };
 245
 246 /* 3.8 Identification Payload */
 247         /* MUST NOT to be used, because of being defined in ipsec-doi. */
 248 struct ikev1_pl_id {
 249         struct isakmp_gen h;
 250         union {
 251                 u_int8_t  id_type;   /* ID Type */
 252                 u_int32_t doi_data;  /* DOI Specific ID Data */
 253         } d;
 254         /* Identification Data */
 255 };
 256
 257 /* 3.9 Certificate Payload */
 258 struct ikev1_pl_cert {
 259         struct isakmp_gen h;
 260         u_int8_t encode; /* Cert Encoding */
 261         char   cert;   /* Certificate Data */
 262                 /*
 263                 This field indicates the type of
 264                 certificate or certificate-related information contained in the
 265                 Certificate Data field.
 266                 */
 267 };
 268
 269 /* Certificate Type */
 270 #define ISAKMP_CERT_NONE   0
 271 #define ISAKMP_CERT_PKCS   1
 272 #define ISAKMP_CERT_PGP    2
 273 #define ISAKMP_CERT_DNS    3
 274 #define ISAKMP_CERT_SIGN   4
 275 #define ISAKMP_CERT_KE     5
 276 #define ISAKMP_CERT_KT     6
 277 #define ISAKMP_CERT_CRL    7
 278 #define ISAKMP_CERT_ARL    8
 279 #define ISAKMP_CERT_SPKI   9
 280
 281 /* 3.10 Certificate Request Payload */
 282 struct ikev1_pl_cr {
 283         struct isakmp_gen h;
 284         u_int8_t num_cert; /* # Cert. Types */
 285         /*
 286         Certificate Types (variable length)
 287           -- Contains a list of the types of certificates requested,
 288           sorted in order of preference.  Each individual certificate
 289           type is 1 octet.  This field is NOT requiredo
 290         */
 291         /* # Certificate Authorities (1 octet) */
 292         /* Certificate Authorities (variable length) */
 293 };
 294
 295 /* 3.11 Hash Payload */
 296         /* may not be used, because of having only data. */
 297 struct ikev1_pl_hash {
 298         struct isakmp_gen h;
 299         /* Hash Data */
 300 };
 301
 302 /* 3.12 Signature Payload */
 303         /* may not be used, because of having only data. */
 304 struct ikev1_pl_sig {
 305         struct isakmp_gen h;
 306         /* Signature Data */
 307 };
 308
 309 /* 3.13 Nonce Payload */
 310         /* may not be used, because of having only data. */
 311 struct ikev1_pl_nonce {
 312         struct isakmp_gen h;
 313         /* Nonce Data */
 314 };
 315
 316 /* 3.14 Notification Payload */
 317 struct ikev1_pl_n {
 318         struct isakmp_gen h;
 319         u_int32_t doi;      /* Domain of Interpretation */
 320         u_int8_t  prot_id;  /* Protocol-ID */
 321         u_int8_t  spi_size; /* SPI Size */
 322         u_int16_t type;     /* Notify Message Type */
 323         /* SPI */
 324         /* Notification Data */
 325 };
 326
 327 /* 3.14.1 Notify Message Types */
 328 /* NOTIFY MESSAGES - ERROR TYPES */
 329 #define ISAKMP_NTYPE_INVALID_PAYLOAD_TYPE           1
 330 #define ISAKMP_NTYPE_DOI_NOT_SUPPORTED              2
 331 #define ISAKMP_NTYPE_SITUATION_NOT_SUPPORTED        3
 332 #define ISAKMP_NTYPE_INVALID_COOKIE                 4
 333 #define ISAKMP_NTYPE_INVALID_MAJOR_VERSION          5
 334 #define ISAKMP_NTYPE_INVALID_MINOR_VERSION          6
 335 #define ISAKMP_NTYPE_INVALID_EXCHANGE_TYPE          7
 336 #define ISAKMP_NTYPE_INVALID_FLAGS                  8
 337 #define ISAKMP_NTYPE_INVALID_MESSAGE_ID             9
 338 #define ISAKMP_NTYPE_INVALID_PROTOCOL_ID            10
 339 #define ISAKMP_NTYPE_INVALID_SPI                    11
 340 #define ISAKMP_NTYPE_INVALID_TRANSFORM_ID           12
 341 #define ISAKMP_NTYPE_ATTRIBUTES_NOT_SUPPORTED       13
 342 #define ISAKMP_NTYPE_NO_PROPOSAL_CHOSEN             14
 343 #define ISAKMP_NTYPE_BAD_PROPOSAL_SYNTAX            15
 344 #define ISAKMP_NTYPE_PAYLOAD_MALFORMED              16
 345 #define ISAKMP_NTYPE_INVALID_KEY_INFORMATION        17
 346 #define ISAKMP_NTYPE_INVALID_ID_INFORMATION         18
 347 #define ISAKMP_NTYPE_INVALID_CERT_ENCODING          19
 348 #define ISAKMP_NTYPE_INVALID_CERTIFICATE            20
 349 #define ISAKMP_NTYPE_BAD_CERT_REQUEST_SYNTAX        21
 350 #define ISAKMP_NTYPE_INVALID_CERT_AUTHORITY         22
 351 #define ISAKMP_NTYPE_INVALID_HASH_INFORMATION       23
 352 #define ISAKMP_NTYPE_AUTHENTICATION_FAILED          24
 353 #define ISAKMP_NTYPE_INVALID_SIGNATURE              25
 354 #define ISAKMP_NTYPE_ADDRESS_NOTIFICATION           26
 355 /* NOTIFY MESSAGES - STATUS TYPES */
 356 #define ISAKMP_NTYPE_CONNECTED                   16384
 357 /* using only to log */
 358 #define ISAKMP_LOG_RETRY_LIMIT_REACHED           65530
 359
 360 /* 3.15 Delete Payload */
 361 struct ikev1_pl_d {
 362         struct isakmp_gen h;
 363         u_int32_t doi;      /* Domain of Interpretation */
 364         u_int8_t  prot_id;  /* Protocol-Id */
 365         u_int8_t  spi_size; /* SPI Size */
 366         u_int16_t num_spi;  /* # of SPIs */
 367         /* SPI(es) */
 368 };
 369
 370 \f
 371 struct ikev1_ph1tab {
 372         struct ikev1_ph1 *head;
 373         struct ikev1_ph1 *tail;
 374         int len;
 375 };
 376
 377 struct isakmp_ph2tab {
 378         struct ikev1_ph2 *head;
 379         struct ikev1_ph2 *tail;
 380         int len;
 381 };
 382
 383 #define EXCHANGE_PROXY   1
 384 #define EXCHANGE_MYSELF  0
 385
 386 #define PFS_NEED        1
 387 #define PFS_NONEED      0
 388
 389 /* IKEv2 (RFC4306) */
 390
 391 /* 3.3  Security Association Payload -- generic header */
 392 /* 3.3.1.  Proposal Substructure */
 393 struct ikev2_p {
 394         struct isakmp_gen h;
 395         u_int8_t p_no;      /* Proposal # */
 396         u_int8_t prot_id;   /* Protocol */
 397         u_int8_t spi_size;  /* SPI Size */
 398         u_int8_t num_t;     /* Number of Transforms */
 399 };
 400
 401 /* 3.3.2.  Transform Substructure */
 402 struct ikev2_t {
 403         struct isakmp_gen h;
 404         u_int8_t t_type;    /* Transform Type (ENCR,PRF,INTEG,etc.*/
 405         u_int8_t res2;      /* reserved byte */
 406         u_int16_t t_id;     /* Transform ID */
 407 };
 408
 409 enum ikev2_t_type {
 410         IV2_T_ENCR = 1,
 411         IV2_T_PRF  = 2,
 412         IV2_T_INTEG= 3,
 413         IV2_T_DH   = 4,
 414         IV2_T_ESN  = 5,
 415 };
 416
 417 /* 3.4.  Key Exchange Payload */
 418 struct ikev2_ke {
 419         struct isakmp_gen h;
 420         u_int16_t  ke_group;
 421         u_int16_t  ke_res1;
 422         /* KE data */
 423 };
 424
 425
 426 /* 3.5.  Identification Payloads */
 427 enum ikev2_id_type {
 428         ID_IPV4_ADDR=1,
 429         ID_FQDN=2,
 430         ID_RFC822_ADDR=3,
 431         ID_IPV6_ADDR=5,
 432         ID_DER_ASN1_DN=9,
 433         ID_DER_ASN1_GN=10,
 434         ID_KEY_ID=11,
 435 };
 436 struct ikev2_id {
 437         struct isakmp_gen h;
 438         u_int8_t  type;        /* ID type */
 439         u_int8_t  res1;
 440         u_int16_t res2;
 441         /* SPI */
 442         /* Notification Data */
 443 };
 444
 445 /* 3.10 Notification Payload */
 446 struct ikev2_n {
 447         struct isakmp_gen h;
 448         u_int8_t  prot_id;  /* Protocol-ID */
 449         u_int8_t  spi_size; /* SPI Size */
 450         u_int16_t type;     /* Notify Message Type */
 451 };
 452
 453 enum ikev2_n_type {
 454         IV2_NOTIFY_UNSUPPORTED_CRITICAL_PAYLOAD            = 1,
 455         IV2_NOTIFY_INVALID_IKE_SPI                         = 4,
 456         IV2_NOTIFY_INVALID_MAJOR_VERSION                   = 5,
 457         IV2_NOTIFY_INVALID_SYNTAX                          = 7,
 458         IV2_NOTIFY_INVALID_MESSAGE_ID                      = 9,
 459         IV2_NOTIFY_INVALID_SPI                             =11,
 460         IV2_NOTIFY_NO_PROPOSAL_CHOSEN                      =14,
 461         IV2_NOTIFY_INVALID_KE_PAYLOAD                      =17,
 462         IV2_NOTIFY_AUTHENTICATION_FAILED                   =24,
 463         IV2_NOTIFY_SINGLE_PAIR_REQUIRED                    =34,
 464         IV2_NOTIFY_NO_ADDITIONAL_SAS                       =35,
 465         IV2_NOTIFY_INTERNAL_ADDRESS_FAILURE                =36,
 466         IV2_NOTIFY_FAILED_CP_REQUIRED                      =37,
 467         IV2_NOTIFY_INVALID_SELECTORS                       =39,
 468         IV2_NOTIFY_INITIAL_CONTACT                         =16384,
 469         IV2_NOTIFY_SET_WINDOW_SIZE                         =16385,
 470         IV2_NOTIFY_ADDITIONAL_TS_POSSIBLE                  =16386,
 471         IV2_NOTIFY_IPCOMP_SUPPORTED                        =16387,
 472         IV2_NOTIFY_NAT_DETECTION_SOURCE_IP                 =16388,
 473         IV2_NOTIFY_NAT_DETECTION_DESTINATION_IP            =16389,
 474         IV2_NOTIFY_COOKIE                                  =16390,
 475         IV2_NOTIFY_USE_TRANSPORT_MODE                      =16391,
 476         IV2_NOTIFY_HTTP_CERT_LOOKUP_SUPPORTED              =16392,
 477         IV2_NOTIFY_REKEY_SA                                =16393,
 478         IV2_NOTIFY_ESP_TFC_PADDING_NOT_SUPPORTED           =16394,
 479         IV2_NOTIFY_NON_FIRST_FRAGMENTS_ALSO                =16395
 480 };
 481
 482 struct notify_messages {
 483         u_int16_t type;
 484         char     *msg;
 485 };
 486
 487 /* 3.8 Notification Payload */
 488 struct ikev2_auth {
 489         struct isakmp_gen h;
 490         u_int8_t  auth_method;  /* Protocol-ID */
 491         u_int8_t  reserved[3];
 492         /* authentication data */
 493 };
 494
 495 enum ikev2_auth_type {
 496         IV2_RSA_SIG = 1,
 497         IV2_SHARED  = 2,
 498         IV2_DSS_SIG = 3,
 499 };
 500
 501 #endif /* !defined(_ISAKMP_H_) */