[svn-upgrade] Integrating new upstream version, strongswan (4.1.1)

1 files changed, 655 insertions, 0 deletions

diff --git a/src/pluto/packet.h b/src/pluto/packet.h
new file mode 100644
index 000000000..676a5e6cd
--- /dev/null
+++ b/src/pluto/packet.h
@@ -0,0 +1,655 @@
+/* parsing packets: formats and tools
+ * Copyright (C) 1997 Angelos D. Keromytis.
+ * Copyright (C) 1998-2001  D. Hugh Redelmeier.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * RCSID $Id: packet.h,v 1.5 2005/01/06 22:10:15 as Exp $
+ */
+
+#ifndef _PACKET_H
+#define _PACKET_H
+
+/* a struct_desc describes a structure for the struct I/O routines.
+ * This requires arrays of field_desc values to describe struct fields.
+ */
+
+typedef const struct struct_desc {
+    const char *name;
+    const struct field_desc *fields;
+    size_t size;
+} struct_desc;
+
+/* Note: if an ft_af_enum field has the ISAKMP_ATTR_AF_TV bit set,
+ * the subsequent ft_lv field will be interpreted as an immediate value.
+ * This matches how attributes are encoded.
+ * See RFC 2408 "ISAKMP" 3.3
+ */
+
+enum field_type {
+    ft_mbz,	      /* must be zero */
+    ft_nat,	      /* natural number (may be 0) */
+    ft_len,	      /* length of this struct and any following crud */
+    ft_lv,	      /* length/value field of attribute */
+    ft_enum,	      /* value from an enumeration */
+    ft_loose_enum,    /* value from an enumeration with only some names known */
+    ft_af_loose_enum, /* Attribute Format + enumeration, some names known */
+    ft_af_enum,       /* Attribute Format + value from an enumeration */
+    ft_set,	      /* bits representing set */
+    ft_raw,	      /* bytes to be left in network-order */
+    ft_end,	      /* end of field list */
+};
+
+typedef const struct field_desc {
+    enum field_type field_type;
+    int	size;	/* size, in bytes, of field */
+    const char *name;
+    const void *desc;	/* enum_names for enum or char *[] for bits */
+} field_desc;
+
+/* The formatting of input and output of packets is done
+ * through packet_byte_stream objects.
+ * These describe a stream of bytes in memory.
+ * Several routines are provided to manipulate these objects
+ * Actual packet transfer is done elsewhere.
+ */
+typedef struct packet_byte_stream {
+    struct packet_byte_stream *container;   /* PBS of which we are part */
+    struct_desc *desc;
+    const char *name;	/* what does this PBS represent? */
+    u_int8_t
+	*start,
+	*cur,	/* current position in stream */
+	*roof;	/* byte after last in PBS (actually just a limit on output) */
+    /* For an output PBS, the length field will be filled in later so
+     * we need to record its particulars.  Note: it may not be aligned.
+     */
+    u_int8_t *lenfld;
+    field_desc *lenfld_desc;
+} pb_stream;
+
+/* For an input PBS, pbs_offset is amount of stream processed.
+ * For an output PBS, pbs_offset is current size of stream.
+ * For an input PBS, pbs_room is size of stream.
+ * For an output PBS, pbs_room is maximum size allowed.
+ */
+#define pbs_offset(pbs) ((size_t)((pbs)->cur - (pbs)->start))
+#define pbs_room(pbs) ((size_t)((pbs)->roof - (pbs)->start))
+#define pbs_left(pbs) ((size_t)((pbs)->roof - (pbs)->cur))
+
+extern void init_pbs(pb_stream *pbs, u_int8_t *start, size_t len, const char *name);
+
+extern bool in_struct(void *struct_ptr, struct_desc *sd,
+    pb_stream *ins, pb_stream *obj_pbs);
+extern bool in_raw(void *bytes, size_t len, pb_stream *ins, const char *name);
+
+extern bool out_struct(const void *struct_ptr, struct_desc *sd,
+    pb_stream *outs, pb_stream *obj_pbs);
+extern bool out_generic(u_int8_t np, struct_desc *sd,
+    pb_stream *outs, pb_stream *obj_pbs);
+extern bool out_generic_raw(u_int8_t np, struct_desc *sd,
+    pb_stream *outs, const void *bytes, size_t len, const char *name);
+#define out_generic_chunk(np, sd, outs, ch, name) \
+	out_generic_raw(np, sd, outs, (ch).ptr, (ch).len, name)
+extern bool out_zero(size_t len, pb_stream *outs, const char *name);
+extern bool out_raw(const void *bytes, size_t len, pb_stream *outs, const char *name);
+#define out_chunk(ch, outs, name) out_raw((ch).ptr, (ch).len, (outs), (name))
+extern void close_output_pbs(pb_stream *pbs);
+
+#ifdef DEBUG
+extern void DBG_print_struct(const char *label, const void *struct_ptr,
+    struct_desc *sd, bool len_meaningful);
+#endif
+
+/* ISAKMP Header: for all messages
+ * layout from RFC 2408 "ISAKMP" section 3.1
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !                          Initiator                            !
+ * !                            Cookie                             !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !                          Responder                            !
+ * !                            Cookie                             !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !  Next Payload ! MjVer ! MnVer ! Exchange Type !     Flags     !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !                          Message ID                           !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !                            Length                             !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * Although the drafts are a little unclear, there are a few
+ * places that specify that messages should be padded with 0x00
+ * octets (bytes) to make the length a multiple of something.
+ *
+ * RFC 2408 "ISAKMP" 3.6 specifies that all messages will be
+ * padded to be a multiple of 4 octets in length.
+ * ??? This looks vestigial, and we ignore this requirement.
+ *
+ * RFC 2409 "IKE" Appedix B specifies:
+ *     Each message should be padded up to the nearest block size
+ *     using bytes containing 0x00.
+ * ??? This does not appear to be limited to encrypted messages,
+ * but it surely must be: the block size is meant to be the encryption
+ * block size, and that is meaningless for a non-encrypted message.
+ *
+ * RFC 2409 "IKE" 5.3 specifies:
+ *     Encrypted payloads are padded up to the nearest block size.
+ *     All padding bytes, except for the last one, contain 0x00. The
+ *     last byte of the padding contains the number of the padding
+ *     bytes used, excluding the last one. Note that this means there
+ *     will always be padding.
+ * ??? This is nuts since payloads are not padded, messages are.
+ * It also contradicts Appendix B.  So we ignore it.
+ *
+ * Summary: we pad encrypted output messages with 0x00 to bring them
+ * up to a multiple of the encryption block size.  On input, we require
+ * that any encrypted portion of a message be a multiple of the encryption
+ * block size.   After any decryption, we ignore padding (any bytes after
+ * the first payload that specifies a next payload of none; we don't
+ * require them to be zero).
+ */
+
+struct isakmp_hdr
+{
+    u_int8_t    isa_icookie[COOKIE_SIZE];
+    u_int8_t    isa_rcookie[COOKIE_SIZE];
+    u_int8_t    isa_np;                 /* Next payload */
+    u_int8_t	isa_version;	/* high-order 4 bits: Major; low order 4: Minor */
+#define ISA_MAJ_SHIFT	4
+#define ISA_MIN_MASK	(~((~0u) << ISA_MAJ_SHIFT))
+    u_int8_t    isa_xchg;		/* Exchange type */
+    u_int8_t    isa_flags;
+    u_int32_t   isa_msgid;		/* Message ID (RAW) */
+    u_int32_t   isa_length;		/* Length of message */
+};
+
+extern struct_desc isakmp_hdr_desc;
+
+/* Generic portion of all ISAKMP payloads.
+ * layout from RFC 2408 "ISAKMP" section 3.2
+ * This describes the first 32-bit chunk of all payloads.
+ * The previous next payload depends on the actual payload type.
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * ! Next Payload  !   RESERVED    !         Payload Length        !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct isakmp_generic
+{
+    u_int8_t    isag_np;
+    u_int8_t    isag_reserved;
+    u_int16_t   isag_length;
+};
+
+extern struct_desc isakmp_generic_desc;
+
+/* ISAKMP Data Attribute (generic representation within payloads)
+ * layout from RFC 2408 "ISAKMP" section 3.3
+ * This is not a payload type.
+ * In TLV format, this is followed by a value field.
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !A!       Attribute Type        !    AF=0  Attribute Length     !
+ * !F!                             !    AF=1  Attribute Value      !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * .                   AF=0  Attribute Value                       .
+ * .                   AF=1  Not Transmitted                       .
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct isakmp_attribute
+{
+    /* The high order bit of isaat_af_type is the Attribute Format
+     * If it is off, the format is TLV: lv is the length of the following
+     * attribute value.
+     * If it is on, the format is TV: lv is the value of the attribute.
+     * ISAKMP_ATTR_AF_MASK is the mask in host form.
+     *
+     * The low order 15 bits of isaat_af_type is the Attribute Type.
+     * ISAKMP_ATTR_RTYPE_MASK is the mask in host form.
+     */
+    u_int16_t isaat_af_type;   /* high order bit: AF; lower 15: rtype */
+    u_int16_t isaat_lv;			/* Length or value */
+};
+
+#define ISAKMP_ATTR_AF_MASK 0x8000
+#define ISAKMP_ATTR_AF_TV ISAKMP_ATTR_AF_MASK /* value in lv */
+#define ISAKMP_ATTR_AF_TLV 0 /* length in lv; value follows */
+
+#define ISAKMP_ATTR_RTYPE_MASK 0x7FFF
+
+extern struct_desc
+    isakmp_oakley_attribute_desc,
+    isakmp_ipsec_attribute_desc;
+
+/* ISAKMP Security Association Payload
+ * layout from RFC 2408 "ISAKMP" section 3.4
+ * A variable length Situation follows.
+ * Previous next payload: ISAKMP_NEXT_SA
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * ! Next Payload  !   RESERVED    !         Payload Length        !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !              Domain of Interpretation  (DOI)                  !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !                                                               !
+ * ~                           Situation                           ~
+ * !                                                               !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct isakmp_sa
+{
+    u_int8_t  isasa_np;			/* Next payload */
+    u_int8_t  isasa_reserved;
+    u_int16_t isasa_length;		/* Payload length */
+    u_int32_t isasa_doi;		/* DOI */
+};
+
+extern struct_desc isakmp_sa_desc;
+
+extern struct_desc ipsec_sit_desc;
+
+/* ISAKMP Proposal Payload
+ * layout from RFC 2408 "ISAKMP" section 3.5
+ * A variable length SPI follows.
+ * Previous next payload: ISAKMP_NEXT_P
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * ! Next Payload  !   RESERVED    !         Payload Length        !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !  Proposal #   !  Protocol-Id  !    SPI Size   !# of Transforms!
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !                        SPI (variable)                         !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct isakmp_proposal
+{
+    u_int8_t    isap_np;
+    u_int8_t    isap_reserved;
+    u_int16_t   isap_length;
+    u_int8_t    isap_proposal;
+    u_int8_t    isap_protoid;
+    u_int8_t    isap_spisize;
+    u_int8_t    isap_notrans;		/* Number of transforms */
+};
+
+extern struct_desc isakmp_proposal_desc;
+
+/* ISAKMP Transform Payload
+ * layout from RFC 2408 "ISAKMP" section 3.6
+ * Variable length SA Attributes follow.
+ * Previous next payload: ISAKMP_NEXT_T
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * ! Next Payload  !   RESERVED    !         Payload Length        !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !  Transform #  !  Transform-Id !           RESERVED2           !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !                                                               !
+ * ~                        SA Attributes                          ~
+ * !                                                               !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct isakmp_transform
+{
+    u_int8_t    isat_np;
+    u_int8_t    isat_reserved;
+    u_int16_t   isat_length;
+    u_int8_t    isat_transnum;		/* Number of the transform */
+    u_int8_t    isat_transid;
+    u_int16_t   isat_reserved2;
+};
+
+extern struct_desc
+    isakmp_isakmp_transform_desc,
+    isakmp_ah_transform_desc,
+    isakmp_esp_transform_desc,
+    isakmp_ipcomp_transform_desc;
+
+/* ISAKMP Key Exchange Payload: no fixed fields beyond the generic ones.
+ * layout from RFC 2408 "ISAKMP" section 3.7
+ * Variable Key Exchange Data follow the generic fields.
+ * Previous next payload: ISAKMP_NEXT_KE
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * ! Next Payload  !   RESERVED    !         Payload Length        !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !                                                               !
+ * ~                       Key Exchange Data                       ~
+ * !                                                               !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+extern struct_desc isakmp_keyex_desc;
+
+/* ISAKMP Identification Payload
+ * layout from RFC 2408 "ISAKMP" section 3.8
+ * See "struct identity" declared later.
+ * Variable length Identification Data follow.
+ * Previous next payload: ISAKMP_NEXT_ID
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * ! Next Payload  !   RESERVED    !         Payload Length        !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !   ID Type     !             DOI Specific ID Data              !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !                                                               !
+ * ~                   Identification Data                         ~
+ * !                                                               !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct isakmp_id
+{
+    u_int8_t    isaid_np;
+    u_int8_t    isaid_reserved;
+    u_int16_t   isaid_length;
+    u_int8_t    isaid_idtype;
+    u_int8_t    isaid_doi_specific_a;
+    u_int16_t   isaid_doi_specific_b;
+};
+
+extern struct_desc isakmp_identification_desc;
+
+/* IPSEC Identification Payload Content
+ * layout from RFC 2407 "IPsec DOI" section 4.6.2
+ * See struct isakmp_id declared earlier.
+ * Note: Hashing skips the ISAKMP generic payload header
+ * Variable length Identification Data follow.
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !  Next Payload !   RESERVED    !        Payload Length         !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !   ID Type     !  Protocol ID  !             Port              !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * ~                     Identification Data                       ~
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct isakmp_ipsec_id
+{
+    u_int8_t    isaiid_np;
+    u_int8_t    isaiid_reserved;
+    u_int16_t   isaiid_length;
+    u_int8_t    isaiid_idtype;
+    u_int8_t    isaiid_protoid;
+    u_int16_t   isaiid_port;
+};
+
+extern struct_desc isakmp_ipsec_identification_desc;
+
+/* ISAKMP Certificate Payload: no fixed fields beyond the generic ones.
+ * layout from RFC 2408 "ISAKMP" section 3.9
+ * Variable length Certificate Data follow the generic fields.
+ * Previous next payload: ISAKMP_NEXT_CERT.
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * ! Next Payload  !   RESERVED    !         Payload Length        !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * ! Cert Encoding !                                               !
+ * +-+-+-+-+-+-+-+-+                                               !
+ * ~                       Certificate Data                        ~
+ * !                                                               !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct isakmp_cert
+{
+    u_int8_t    isacert_np;
+    u_int8_t    isacert_reserved;
+    u_int16_t   isacert_length;
+    u_int8_t    isacert_type;
+};
+
+/* NOTE: this packet type has a fixed portion that is not a
+ * multiple of 4 octets.  This means that sizeof(struct isakmp_cert)
+ * yields the wrong value for the length.
+ */
+#define ISAKMP_CERT_SIZE		5
+
+extern struct_desc isakmp_ipsec_certificate_desc;
+
+/* ISAKMP Certificate Request Payload: no fixed fields beyond the generic ones.
+ * layout from RFC 2408 "ISAKMP" section 3.10
+ * Variable length Certificate Types and Certificate Authorities follow.
+ * Previous next payload: ISAKMP_NEXT_CR.
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * ! Next Payload  !   RESERVED    !         Payload Length        !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !  Cert. Type   !                                               !
+ * +-+-+-+-+-+-+-+-+                                               !
+ * ~                    Certificate Authority                      ~
+ * !                                                               !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct isakmp_cr
+{
+    u_int8_t    isacr_np;
+    u_int8_t    isacr_reserved;
+    u_int16_t   isacr_length;
+    u_int8_t    isacr_type;
+};
+
+/* NOTE: this packet type has a fixed portion that is not a
+ * multiple of 4 octets.  This means that sizeof(struct isakmp_cr)
+ * yields the wrong value for the length.
+ */
+#define ISAKMP_CR_SIZE		5
+
+extern struct_desc isakmp_ipsec_cert_req_desc;
+
+/* ISAKMP Hash Payload: no fixed fields beyond the generic ones.
+ * layout from RFC 2408 "ISAKMP" section 3.11
+ * Variable length Hash Data follow.
+ * Previous next payload: ISAKMP_NEXT_HASH.
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * ! Next Payload  !   RESERVED    !         Payload Length        !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !                                                               !
+ * ~                           Hash Data                           ~
+ * !                                                               !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+extern struct_desc isakmp_hash_desc;
+
+/* ISAKMP Signature Payload: no fixed fields beyond the generic ones.
+ * layout from RFC 2408 "ISAKMP" section 3.12
+ * Variable length Signature Data follow.
+ * Previous next payload: ISAKMP_NEXT_SIG.
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * ! Next Payload  !   RESERVED    !         Payload Length        !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !                                                               !
+ * ~                         Signature Data                        ~
+ * !                                                               !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+extern struct_desc isakmp_signature_desc;
+
+/* ISAKMP Nonce Payload: no fixed fields beyond the generic ones.
+ * layout from RFC 2408 "ISAKMP" section 3.13
+ * Variable length Nonce Data follow.
+ * Previous next payload: ISAKMP_NEXT_NONCE.
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * ! Next Payload  !   RESERVED    !         Payload Length        !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !                                                               !
+ * ~                            Nonce Data                         ~
+ * !                                                               !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+extern struct_desc isakmp_nonce_desc;
+
+/* ISAKMP Notification Payload
+ * layout from RFC 2408 "ISAKMP" section 3.14
+ * This is followed by a variable length SPI
+ * and then possibly by variable length Notification Data.
+ * Previous next payload: ISAKMP_NEXT_N
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * ! Next Payload  !   RESERVED    !         Payload Length        !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !              Domain of Interpretation  (DOI)                  !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !  Protocol-ID  !   SPI Size    !      Notify Message Type      !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !                                                               !
+ * ~                Security Parameter Index (SPI)                 ~
+ * !                                                               !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !                                                               !
+ * ~                       Notification Data                       ~
+ * !                                                               !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct isakmp_notification
+{
+    u_int8_t    isan_np;
+    u_int8_t    isan_reserved;
+    u_int16_t   isan_length;
+    u_int32_t   isan_doi;
+    u_int8_t    isan_protoid;
+    u_int8_t    isan_spisize;
+    u_int16_t   isan_type;
+};
+
+extern struct_desc isakmp_notification_desc;
+
+/* ISAKMP Delete Payload
+ * layout from RFC 2408 "ISAKMP" section 3.15
+ * This is followed by a variable length SPI.
+ * Previous next payload: ISAKMP_NEXT_D
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * ! Next Payload  !   RESERVED    !         Payload Length        !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !              Domain of Interpretation  (DOI)                  !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !  Protocol-Id  !   SPI Size    !           # of SPIs           !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !                                                               !
+ * ~               Security Parameter Index(es) (SPI)              ~
+ * !                                                               !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct isakmp_delete
+{
+    u_int8_t    isad_np;
+    u_int8_t    isad_reserved;
+    u_int16_t   isad_length;
+    u_int32_t   isad_doi;
+    u_int8_t    isad_protoid;
+    u_int8_t    isad_spisize;
+    u_int16_t   isad_nospi;
+};
+
+extern struct_desc isakmp_delete_desc;
+
+/* From draft-dukes-ike-mode-cfg
+3.2. Attribute Payload
+                           1                   2                   3
+       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
+     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     ! Next Payload  !   RESERVED    !         Payload Length        !
+     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     !     Type      !   RESERVED    !           Identifier          !
+     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     !                                                               !
+     !                                                               !
+     ~                           Attributes                          ~
+     !                                                               !
+     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+struct isakmp_mode_attr
+{
+    u_int8_t    isama_np;
+    u_int8_t    isama_reserved;
+    u_int16_t   isama_length;
+    u_int8_t    isama_type;
+    u_int8_t    isama_reserved2;
+    u_int16_t   isama_identifier;
+};
+
+extern struct_desc isakmp_attr_desc;
+extern struct_desc isakmp_modecfg_attribute_desc;
+
+/* ISAKMP Vendor ID Payload
+ * layout from RFC 2408 "ISAKMP" section 3.15
+ * This is followed by a variable length VID.
+ * Previous next payload: ISAKMP_NEXT_VID
+ *                      1                   2                   3
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * ! Next Payload  !   RESERVED    !         Payload Length        !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * !                                                               !
+ * ~                        Vendor ID (VID)                        ~
+ * !                                                               !
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+extern struct_desc isakmp_vendor_id_desc;
+
+struct isakmp_nat_oa
+{
+    u_int8_t    isanoa_np;
+    u_int8_t    isanoa_reserved_1;
+    u_int16_t   isanoa_length;
+    u_int8_t    isanoa_idtype;
+    u_int8_t    isanoa_reserved_2;
+    u_int16_t   isanoa_reserved_3;
+};
+
+extern struct_desc isakmp_nat_d;
+extern struct_desc isakmp_nat_oa;
+
+/* union of all payloads */
+
+union payload {
+    struct isakmp_generic generic;
+    struct isakmp_sa sa;
+    struct isakmp_proposal proposal;
+    struct isakmp_transform transform;
+    struct isakmp_id id;    /* Main Mode */
+    struct isakmp_cert cert;
+    struct isakmp_cr cr;
+    struct isakmp_ipsec_id ipsec_id;	/* Quick Mode */
+    struct isakmp_notification notification;
+    struct isakmp_delete delete;
+    struct isakmp_nat_oa nat_oa;
+    struct isakmp_mode_attr attribute;
+};
+
+/* descriptor for each payload type
+ *
+ * There is a slight problem in that some payloads differ, depending
+ * on the mode.  Since this is table only used for top-level payloads,
+ * Proposal and Transform payloads need not be handled.
+ * That leaves only Identification payloads as a problem.
+ * We make all these entries NULL
+ */
+extern struct_desc *const payload_descs[ISAKMP_NEXT_ROOF];
+
+#endif /* _PACKET_H */