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/* 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 1.23 2002/07/31 02:45:43 dhr Exp $
*/
/* 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_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, 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;
/* 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;
/* 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;
};
/* 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];
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