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/* $OpenBSD: ip_ipsp.h,v 1.21 1999/01/08 21:40:28 deraadt Exp $ */
/*
* The authors of this code are John Ioannidis (ji@tla.org),
* Angelos D. Keromytis (kermit@csd.uch.gr) and
* Niels Provos (provos@physnet.uni-hamburg.de).
*
* 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.
*
* Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
* and Niels Provos.
*
* 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.
*/
/*
* IPSP global definitions.
*/
struct expiration
{
u_int32_t exp_timeout;
struct in_addr exp_dst;
u_int32_t exp_spi;
u_int8_t exp_sproto;
struct expiration *exp_next;
struct expiration *exp_prev;
};
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 */
struct in_addr flow_src; /* Source address */
struct in_addr flow_srcmask; /* Source netmask */
struct in_addr flow_dst; /* Destination address */
struct in_addr flow_dstmask; /* Destination netmask */
u_int16_t flow_sport; /* Source port, if applicable */
u_int16_t flow_dport; /* Destination port, if applicable */
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; /* next in input (prev!) */
struct xformsw *tdb_xform; /* transformation to use */
u_int32_t tdb_spi; /* SPI to use */
u_int32_t tdb_flags; /* Flags related to this TDB */
#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_PACKETS 0x00008 /* Check the packet counters */
#define TDBF_INVALID 0x00010 /* This SPI is not valid yet/anymore */
#define TDBF_FIRSTUSE 0x00020 /* Expire after first use */
#define TDBF_TUNNELING 0x00040 /* Do IP-in-IP encapsulation */
#define TDBF_SOFT_TIMER 0x00080 /* Soft expiration */
#define TDBF_SOFT_BYTES 0x00100 /* Soft expiration */
#define TDBF_SOFT_PACKETS 0x00200 /* Soft expiration */
#define TDBF_SOFT_FIRSTUSE 0x00400 /* Soft expiration */
#define TDBF_SAME_TTL 0x00800 /* Keep the packet TTL, in tunneling */
u_int64_t tdb_exp_packets; /* Expire after so many packets s|r */
u_int64_t tdb_soft_packets; /* Expiration warning */
u_int64_t tdb_cur_packets; /* Current number of packets s|r'ed */
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_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 */
struct in_addr tdb_dst; /* dest address for this SPI */
struct in_addr tdb_src; /* source address for this SPI,
* used when tunneling */
struct in_addr tdb_osrc;
struct in_addr tdb_odst; /* Source and destination addresses
* of outer IP header if we're doing
* tunneling */
caddr_t tdb_xdata; /* transformation data (opaque) */
struct flow *tdb_flow; /* Which flows use this SA */
u_int8_t tdb_ttl; /* TTL used in tunneling */
u_int8_t tdb_sproto; /* IPsec protocol */
u_int16_t tdb_satype; /* Alignment */
u_int32_t tdb_epoch; /* Used by the kernfs interface */
u_int8_t *tdb_confname; /* Used by the kernfs interface */
u_int8_t *tdb_authname; /* Used by the kernfs interface */
};
#define TDB_HASHMOD 257
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 mbuf *); /* xform initialization */
int (*xf_zeroize)(struct tdb *); /* termination */
struct mbuf *(*xf_input)(struct mbuf *, struct tdb *); /* called when packet received */
int (*xf_output)(struct mbuf *, struct sockaddr_encap *, struct tdb *, struct mbuf **); /* called when packet sent */
};
#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 */
/* Supported key hash algorithms */
#define ALG_AUTH_MD5 1
#define ALG_AUTH_SHA1 2
#define ALG_AUTH_RMD160 3
/* Supported encryption algorithms */
#define ALG_ENC_DES 1
#define ALG_ENC_3DES 2
#define ALG_ENC_BLF 3
#define ALG_ENC_CAST 4
#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
extern unsigned char ipseczeroes[];
/*
* Names for IPsec sysctl objects
*/
#define IPSECCTL_ENCAP 0
#define IPSECCTL_MAXID 1
#define CTL_IPSEC_NAMES {\
{ "encap", CTLTYPE_NODE }, \
}
#ifdef _KERNEL
extern int encdebug;
struct tdb *tdbh[TDB_HASHMOD];
struct expiration *explist;
extern struct xformsw xformsw[], *xformswNXFORMSW;
u_int32_t notify_msgids;
/* Check if a given tdb has encryption, authentication and/or tunneling */
#define TDB_ATTRIB(x) (((x)->tdb_confname != NULL ? NOTIFY_SATYPE_CONF : 0)| \
((x)->tdb_authname != NULL ? NOTIFY_SATYPE_AUTH : 0)| \
((x)->tdb_confname != NULL && \
((x)->tdb_flags & TDBF_TUNNELING) ? NOTIFY_SATYPE_TUNNEL : 0))
/* Traverse spi chain and get attributes */
#define SPI_CHAIN_ATTRIB(have, TDB_DIR, TDBP) {\
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; \
} \
}
/* TDB management routines */
extern u_int32_t reserve_spi(u_int32_t, struct in_addr, u_int8_t, int *);
extern struct tdb *gettdb(u_int32_t, struct in_addr, u_int8_t);
extern void puttdb(struct tdb *);
extern int tdb_delete(struct tdb *, int);
/* Expiration management routines */
extern struct expiration *get_expiration(void);
extern void put_expiration(struct expiration *);
extern void handle_expirations(void *);
extern void cleanup_expirations(struct in_addr, u_int32_t, u_int8_t);
/* 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(struct in_addr, struct in_addr, struct in_addr,
struct in_addr, u_int8_t, u_int16_t, u_int16_t,
struct tdb *);
extern struct flow *find_global_flow(struct in_addr, struct in_addr,
struct in_addr, struct in_addr, u_int8_t,
u_int16_t, u_int16_t);
/* XF_IP4 */
extern int ipe4_attach(void);
extern int ipe4_init(struct tdb *, struct xformsw *, struct mbuf *);
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 mbuf *);
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 mbuf *);
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 mbuf *);
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 mbuf *);
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 *);
/* 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 *);
#endif
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