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/* $OpenBSD: ip_ipsp.h,v 1.41 1999/08/10 11:35:26 ho Exp $ */
/*
* The authors of this code are John Ioannidis (ji@tla.org),
* Angelos D. Keromytis (kermit@csd.uch.gr),
* Niels Provos (provos@physnet.uni-hamburg.de) and
* Niklas Hallqvist (niklas@appli.se).
*
* This code was written by John Ioannidis for BSD/OS in Athens, Greece,
* in November 1995.
*
* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
* by Angelos D. Keromytis.
*
* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
* and Niels Provos.
*
* Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist.
*
* Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
* Angelos D. Keromytis and Niels Provos.
* Copyright (c) 1999 Niklas Hallqvist.
*
* Permission to use, copy, and modify this software without fee
* is hereby granted, provided that this entire notice is included in
* all copies of any software which is or includes a copy or
* modification of this software.
* You may use this code under the GNU public license if you so wish. Please
* contribute changes back to the authors under this freer than GPL license
* so that we may further the use of strong encryption without limitations to
* all.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
* PURPOSE.
*/
#ifndef _NETINET_IPSP_H_
#define _NETINET_IPSP_H_
/*
* IPSP global definitions.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <netinet/in.h>
#include <sys/md5k.h>
#include <netinet/ip_sha1.h>
#include <netinet/ip_rmd160.h>
#include <netinet/ip_blf.h>
#include <netinet/ip_cast.h>
#include <netinet/ip_skipjack.h>
union sockaddr_union
{
struct sockaddr sa;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
};
/* HMAC key sizes */
#define MD5HMAC96_KEYSIZE 16
#define SHA1HMAC96_KEYSIZE 20
#define RIPEMD160HMAC96_KEYSIZE 20
/* IV lengths */
#define ESP_DES_IVS 8
#define ESP_3DES_IVS 8
#define ESP_BLF_IVS 8
#define ESP_CAST_IVS 8
#define ESP_SKIPJACK_IVS 8
#define ESP_MAX_IVS 8 /* Keep updated */
/* Block sizes -- it is assumed that they're powers of 2 */
#define ESP_DES_BLKS 8
#define ESP_3DES_BLKS 8
#define ESP_BLF_BLKS 8
#define ESP_CAST_BLKS 8
#define ESP_SKIPJACK_BLKS 8
#define ESP_MAX_BLKS 8 /* Keep updated */
#define HMAC_BLOCK_LEN 64
#define AH_HMAC_HASHLEN 12 /* 96 bits of authenticator */
#define AH_HMAC_RPLENGTH 4 /* 32 bits of replay counter */
#define AH_HMAC_INITIAL_RPL 1 /* Replay counter initial value */
/* HMAC definitions */
#define HMAC_IPAD_VAL 0x36
#define HMAC_OPAD_VAL 0x5C
#define HMAC_BLOCK_LEN 64
/* Authenticator lengths */
#define AH_MD5_ALEN 16
#define AH_SHA1_ALEN 20
#define AH_RMD160_ALEN 20
#define AH_ALEN_MAX 20 /* Keep updated */
/* Reserved SPI numbers */
#define SPI_LOCAL_USE 0
#define SPI_RESERVED_MIN 1
#define SPI_RESERVED_MAX 255
struct sockaddr_encap
{
u_int8_t sen_len; /* length */
u_int8_t sen_family; /* PF_KEY */
u_int16_t sen_type; /* see SENT_* */
union
{
u_int8_t Data[16]; /* other stuff mapped here */
struct /* SENT_IP4 */
{
struct in_addr Src;
struct in_addr Dst;
u_int16_t Sport;
u_int16_t Dport;
u_int8_t Proto;
u_int8_t Filler[3];
} Sip4;
struct /* SENT_IPSP */
{
struct in_addr Dst;
u_int32_t Spi;
u_int8_t Sproto;
u_int8_t Filler[7];
} Sipsp;
} Sen;
};
#define sen_data Sen.Data
#define sen_ip_src Sen.Sip4.Src
#define sen_ip_dst Sen.Sip4.Dst
#define sen_proto Sen.Sip4.Proto
#define sen_sport Sen.Sip4.Sport
#define sen_dport Sen.Sip4.Dport
#define sen_ipsp_dst Sen.Sipsp.Dst
#define sen_ipsp_spi Sen.Sipsp.Spi
#define sen_ipsp_sproto Sen.Sipsp.Sproto
/*
* The "type" is really part of the address as far as the routing
* system is concerned. By using only one bit in the type field
* for each type, we sort-of make sure that different types of
* encapsulation addresses won't be matched against the wrong type.
*
*/
#define SENT_IP4 0x0001 /* data is two struct in_addr */
#define SENT_IPSP 0x0002 /* data as in IP4 plus SPI */
/*
* SENT_HDRLEN is the length of the "header"
* SENT_*_LEN are the lengths of various forms of sen_data
* SENT_*_OFF are the offsets in the sen_data array of various fields
*/
#define SENT_HDRLEN (2 * sizeof(u_int8_t) + sizeof(u_int16_t))
#define SENT_IP4_SRCOFF (0)
#define SENT_IP4_DSTOFF (sizeof (struct in_addr))
#define SENT_IP4_LEN 20
#define SENT_IPSP_LEN 20
#define NOTIFY_SOFT_EXPIRE 0 /* Soft expiration of SA */
#define NOTIFY_HARD_EXPIRE 1 /* Hard expiration of SA */
#define NOTIFY_REQUEST_SA 2 /* Establish an SA */
#define NOTIFY_SATYPE_CONF 1 /* SA should do encryption */
#define NOTIFY_SATYPE_AUTH 2 /* SA should do authentication */
#define NOTIFY_SATYPE_TUNNEL 4 /* SA should use tunneling */
/*
* For encapsulation routes are possible not only for the destination
* address but also for the protocol, source and destination ports
* if available
*/
struct route_enc {
struct rtentry *re_rt;
struct sockaddr_encap re_dst;
};
struct flow
{
struct flow *flow_next; /* Next in flow chain */
struct flow *flow_prev; /* Previous in flow chain */
struct tdb *flow_sa; /* Pointer to the SA */
union sockaddr_union flow_src; /* Source address */
union sockaddr_union flow_srcmask; /* Source netmask */
union sockaddr_union flow_dst; /* Destination address */
union sockaddr_union flow_dstmask; /* Destination netmask */
u_int8_t flow_proto; /* Transport protocol, if applicable */
u_int8_t foo[3]; /* Alignment */
};
struct tdb /* tunnel descriptor block */
{
struct tdb *tdb_hnext; /* Next in hash chain */
struct tdb *tdb_onext; /* Next in output */
struct tdb *tdb_inext; /* Previous in output */
struct xformsw *tdb_xform; /* Transformation to use */
struct enc_xform *tdb_encalgxform; /* Encryption algorithm xform */
struct auth_hash *tdb_authalgxform; /* Authentication algorithm xform */
#define TDBF_UNIQUE 0x00001 /* This should not be used by others */
#define TDBF_TIMER 0x00002 /* Absolute expiration timer in use */
#define TDBF_BYTES 0x00004 /* Check the byte counters */
#define TDBF_ALLOCATIONS 0x00008 /* Check the flows counters */
#define TDBF_INVALID 0x00010 /* This SPI is not valid yet/anymore */
#define TDBF_FIRSTUSE 0x00020 /* Expire after first use */
#define TDBF_HALFIV 0x00040 /* Use half-length IV (ESP old only) */
#define TDBF_SOFT_TIMER 0x00080 /* Soft expiration */
#define TDBF_SOFT_BYTES 0x00100 /* Soft expiration */
#define TDBF_SOFT_ALLOCATIONS 0x00200 /* Soft expiration */
#define TDBF_SOFT_FIRSTUSE 0x00400 /* Soft expiration */
#define TDBF_PFS 0x00800 /* Ask for PFS from Key Mgmt. */
#define TDBF_TUNNELING 0x01000 /* Force IP-IP encapsulation */
u_int32_t tdb_flags; /* Flags related to this TDB */
TAILQ_ENTRY(tdb) tdb_expnext; /* Expiration cluster list link */
TAILQ_ENTRY(tdb) tdb_explink; /* Expiration ordered list link */
u_int32_t tdb_exp_allocations; /* Expire after so many flows */
u_int32_t tdb_soft_allocations; /* Expiration warning */
u_int32_t tdb_cur_allocations; /* Total number of allocations */
u_int64_t tdb_exp_bytes; /* Expire after so many bytes passed */
u_int64_t tdb_soft_bytes; /* Expiration warning */
u_int64_t tdb_cur_bytes; /* Current count of bytes */
u_int64_t tdb_exp_timeout; /* When does the SPI expire */
u_int64_t tdb_soft_timeout; /* Send a soft-expire warning */
u_int64_t tdb_established; /* When was the SPI established */
u_int64_t tdb_timeout; /* Next absolute expiration time. */
u_int64_t tdb_first_use; /* When was it first used */
u_int64_t tdb_soft_first_use; /* Soft warning */
u_int64_t tdb_exp_first_use; /* Expire if tdb_first_use +
* tdb_exp_first_use <= curtime */
u_int32_t tdb_spi; /* SPI */
u_int16_t tdb_amxkeylen; /* AH-old only */
u_int16_t tdb_ivlen; /* IV length */
u_int8_t tdb_sproto; /* IPsec protocol */
u_int8_t tdb_wnd; /* Replay window */
u_int8_t tdb_satype; /* SA type (RFC2367, PF_KEY) */
u_int8_t tdb_FILLER; /* Padding */
union sockaddr_union tdb_dst; /* Destination address for this SA */
union sockaddr_union tdb_src; /* Source address for this SA */
union sockaddr_union tdb_proxy;
u_int8_t *tdb_key; /* Key material (schedules) */
u_int8_t *tdb_ictx; /* Authentication contexts */
u_int8_t *tdb_octx;
u_int8_t *tdb_srcid; /* Source ID for this SA */
u_int8_t *tdb_dstid; /* Destination ID for this SA */
u_int8_t *tdb_amxkey; /* AH-old only */
union
{
u_int8_t Iv[ESP_3DES_IVS]; /* That's enough space */
u_int32_t Ivl; /* Make sure this is 4 bytes */
u_int64_t Ivq; /* Make sure this is 8 bytes! */
}IV;
#define tdb_iv IV.Iv
#define tdb_ivl IV.Ivl
#define tdb_ivq IV.Ivq
u_int32_t tdb_rpl; /* Replay counter */
u_int32_t tdb_bitmap; /* Used for replay sliding window */
u_int32_t tdb_initial; /* Initial replay value */
u_int32_t tdb_epoch; /* Used by the kernfs interface */
u_int16_t tdb_srcid_len;
u_int16_t tdb_dstid_len;
u_int16_t tdb_srcid_type;
u_int16_t tdb_dstid_type;
struct flow *tdb_flow; /* Which flows use this SA */
struct tdb *tdb_bind_out; /* Outgoing SA to use */
TAILQ_HEAD(tdb_bind_head, tdb) tdb_bind_in;
TAILQ_ENTRY(tdb) tdb_bind_in_next; /* Refering Incoming SAs */
TAILQ_HEAD(tdb_inp_head, inpcb) tdb_inp;
};
union authctx_old {
MD5_CTX md5ctx;
SHA1_CTX sha1ctx;
};
union authctx {
MD5_CTX md5ctx;
SHA1_CTX sha1ctx;
RMD160_CTX rmd160ctx;
};
struct tdb_ident {
u_int32_t spi;
union sockaddr_union dst;
u_int8_t proto;
};
struct auth_hash {
int type;
char *name;
u_int16_t keysize;
u_int16_t hashsize;
u_int16_t ctxsize;
void (*Init)(void *);
void (*Update)(void *, u_int8_t *, u_int16_t);
void (*Final)(u_int8_t *, void *);
};
struct enc_xform {
int type;
char *name;
u_int16_t blocksize, ivsize;
u_int16_t minkey, maxkey;
u_int32_t ivmask; /* Or all possible modes, zero iv = 1 */
void (*encrypt)(struct tdb *, u_int8_t *);
void (*decrypt)(struct tdb *, u_int8_t *);
void (*setkey)(u_int8_t **, u_int8_t *, int len);
void (*zerokey)(u_int8_t **);
};
struct ipsecinit
{
u_int8_t *ii_enckey;
u_int8_t *ii_authkey;
u_int16_t ii_enckeylen;
u_int16_t ii_authkeylen;
u_int8_t ii_encalg;
u_int8_t ii_authalg;
};
struct xformsw
{
u_short xf_type; /* Unique ID of xform */
u_short xf_flags; /* flags (see below) */
char *xf_name; /* human-readable name */
int (*xf_attach)(void); /* called at config time */
int (*xf_init)(struct tdb *, struct xformsw *, struct ipsecinit *);
int (*xf_zeroize)(struct tdb *); /* termination */
struct mbuf *(*xf_input)(struct mbuf *, struct tdb *); /* input */
int (*xf_output)(struct mbuf *, struct sockaddr_encap *,
struct tdb *, struct mbuf **); /* output */
};
/* xform IDs */
#define XF_IP4 1 /* IP inside IP */
#define XF_OLD_AH 2 /* RFCs 1828 & 1852 */
#define XF_OLD_ESP 3 /* RFCs 1829 & 1851 */
#define XF_NEW_AH 4 /* AH HMAC 96bits */
#define XF_NEW_ESP 5 /* ESP + auth 96bits + replay counter */
#define XF_TCPSIGNATURE 6 /* TCP MD5 Signature option, RFC 2358 */
/* xform attributes */
#define XFT_AUTH 0x0001
#define XFT_CONF 0x0100
#define IPSEC_ZEROES_SIZE 64
#define IPSEC_KERNFS_BUFSIZE 4096
#if BYTE_ORDER == LITTLE_ENDIAN
static __inline u_int64_t
htonq(u_int64_t q)
{
register u_int32_t u, l;
u = q >> 32;
l = (u_int32_t) q;
return htonl(u) | ((u_int64_t)htonl(l) << 32);
}
#define ntohq(_x) htonq(_x)
#elif BYTE_ORDER == BIG_ENDIAN
#define htonq(_x) (_x)
#define ntohq(_x) htonq(_x)
#else
#error "Please fix <machine/endian.h>"
#endif
#ifdef _KERNEL
/*
* Protects all tdb lists.
* Must at least be splsoftclock.
*/
#define spltdb splsoftclock
extern int encdebug;
extern int ipsec_in_use;
extern u_int8_t hmac_ipad_buffer[64];
extern u_int8_t hmac_opad_buffer[64];
extern TAILQ_HEAD(expclusterlist_head, tdb) expclusterlist;
extern TAILQ_HEAD(explist_head, tdb) explist;
extern struct xformsw xformsw[], *xformswNXFORMSW;
/* Check if a given tdb has encryption, authentication and/or tunneling */
#define TDB_ATTRIB(x) (((x)->tdb_encalgxform ? NOTIFY_SATYPE_CONF : 0)| \
((x)->tdb_authalgxform ? NOTIFY_SATYPE_AUTH : 0))
/* Traverse spi chain and get attributes */
#define SPI_CHAIN_ATTRIB(have, TDB_DIR, TDBP) do {\
int s = spltdb(); \
struct tdb *tmptdb = (TDBP); \
\
(have) = 0; \
while (tmptdb && tmptdb->tdb_xform) { \
if (tmptdb == NULL || tmptdb->tdb_flags & TDBF_INVALID) \
break; \
(have) |= TDB_ATTRIB(tmptdb); \
tmptdb = tmptdb->TDB_DIR; \
} \
splx(s); \
} while (0)
/* Misc. */
extern char *inet_ntoa4(struct in_addr);
extern char *ipsp_address(union sockaddr_union);
/* TDB management routines */
extern void tdb_add_inp(struct tdb *tdb, struct inpcb *inp);
extern u_int32_t reserve_spi(u_int32_t, u_int32_t, union sockaddr_union *,
union sockaddr_union *, u_int8_t, int *);
extern struct tdb *gettdb(u_int32_t, union sockaddr_union *, u_int8_t);
extern void puttdb(struct tdb *);
extern void tdb_delete(struct tdb *, int, int);
extern int tdb_init(struct tdb *, u_int16_t, struct ipsecinit *);
extern void tdb_expiration(struct tdb *, int);
/* Flag values for the last argument of tdb_expiration(). */
#define TDBEXP_EARLY 1 /* The tdb is likely to end up early. */
#define TDBEXP_TIMEOUT 2 /* Maintain expiration timeout. */
extern int tdb_walk(int (*)(struct tdb *, void *), void *);
extern void handle_expirations(void *);
/* Flow management routines */
extern struct flow *get_flow(void);
extern void put_flow(struct flow *, struct tdb *);
extern void delete_flow(struct flow *, struct tdb *);
extern struct flow *find_flow(union sockaddr_union *, union sockaddr_union *,
union sockaddr_union *, union sockaddr_union *,
u_int8_t, struct tdb *);
extern struct flow *find_global_flow(union sockaddr_union *,
union sockaddr_union *,
union sockaddr_union *,
union sockaddr_union *, u_int8_t);
/* XF_IP4 */
extern int ipe4_attach(void);
extern int ipe4_init(struct tdb *, struct xformsw *, struct ipsecinit *);
extern int ipe4_zeroize(struct tdb *);
extern int ipe4_output(struct mbuf *, struct sockaddr_encap *, struct tdb *,
struct mbuf **);
extern void ipe4_input __P((struct mbuf *, ...));
extern void ip4_input __P((struct mbuf *, ...));
/* XF_OLD_AH */
extern int ah_old_attach(void);
extern int ah_old_init(struct tdb *, struct xformsw *, struct ipsecinit *);
extern int ah_old_zeroize(struct tdb *);
extern int ah_old_output(struct mbuf *, struct sockaddr_encap *, struct tdb *,
struct mbuf **);
extern struct mbuf *ah_old_input(struct mbuf *, struct tdb *);
/* XF_NEW_AH */
extern int ah_new_attach(void);
extern int ah_new_init(struct tdb *, struct xformsw *, struct ipsecinit *);
extern int ah_new_zeroize(struct tdb *);
extern int ah_new_output(struct mbuf *, struct sockaddr_encap *, struct tdb *,
struct mbuf **);
extern struct mbuf *ah_new_input(struct mbuf *, struct tdb *);
/* XF_OLD_ESP */
extern int esp_old_attach(void);
extern int esp_old_init(struct tdb *, struct xformsw *, struct ipsecinit *);
extern int esp_old_zeroize(struct tdb *);
extern int esp_old_output(struct mbuf *, struct sockaddr_encap *, struct tdb *,
struct mbuf **);
extern struct mbuf *esp_old_input(struct mbuf *, struct tdb *);
/* XF_NEW_ESP */
extern int esp_new_attach(void);
extern int esp_new_init(struct tdb *, struct xformsw *, struct ipsecinit *);
extern int esp_new_zeroize(struct tdb *);
extern int esp_new_output(struct mbuf *, struct sockaddr_encap *, struct tdb *,
struct mbuf **);
extern struct mbuf *esp_new_input(struct mbuf *, struct tdb *);
/* XF_TCPSIGNATURE */
extern int tcp_signature_tdb_attach __P((void));
extern int tcp_signature_tdb_init __P((struct tdb *, struct xformsw *,
struct ipsecinit *));
extern int tcp_signature_tdb_zeroize __P((struct tdb *));
extern struct mbuf *tcp_signature_tdb_input __P((struct mbuf *, struct tdb *));
extern int tcp_signature_tdb_output __P((struct mbuf *,
struct sockaddr_encap *, struct tdb *,
struct mbuf **));
/* Padding */
extern caddr_t m_pad(struct mbuf *, int, int);
/* Replay window */
extern int checkreplaywindow32(u_int32_t, u_int32_t, u_int32_t *, u_int32_t,
u_int32_t *);
extern unsigned char ipseczeroes[];
#endif /* _KERNEL */
#endif /* _NETINET_IPSP_H_ */
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