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/* $OpenBSD: ip_ipsp.h,v 1.72 2000/09/20 19:13:17 angelos 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).
*
* The original version of 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>
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
#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 */
/* 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
/* sysctl default values */
#define IPSEC_DEFAULT_EMBRYONIC_SA_TIMEOUT 60 /* 1 minute */
#define IPSEC_DEFAULT_PFS 1
#define IPSEC_DEFAULT_SOFT_ALLOCATIONS 0
#define IPSEC_DEFAULT_EXP_ALLOCATIONS 0
#define IPSEC_DEFAULT_SOFT_BYTES 0
#define IPSEC_DEFAULT_EXP_BYTES 0
#define IPSEC_DEFAULT_SOFT_TIMEOUT 80000
#define IPSEC_DEFAULT_EXP_TIMEOUT 86400
#define IPSEC_DEFAULT_SOFT_FIRST_USE 3600
#define IPSEC_DEFAULT_EXP_FIRST_USE 7200
#define IPSEC_DEFAULT_DEF_ENC "3des"
#define IPSEC_DEFAULT_DEF_AUTH "hmac-sha1"
#define IPSEC_DEFAULT_EXPIRE_ACQUIRE 30
struct sockaddr_encap
{
u_int8_t sen_len; /* length */
u_int8_t sen_family; /* PF_KEY */
u_int16_t sen_type; /* see SENT_* */
union
{
struct /* SENT_IP4 */
{
u_int8_t Direction;
struct in_addr Src;
struct in_addr Dst;
u_int8_t Proto;
u_int16_t Sport;
u_int16_t Dport;
} Sip4;
struct /* SENT_IP6 */
{
u_int8_t Direction;
struct in6_addr Src;
struct in6_addr Dst;
u_int8_t Proto;
u_int16_t Sport;
u_int16_t Dport;
} Sip6;
struct ipsec_policy *PolicyHead; /* SENT_IPSP */
} Sen;
};
#define IPSP_DIRECTION_IN 0x1
#define IPSP_DIRECTION_OUT 0x2
#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_direction Sen.Sip4.Direction
#define sen_ip6_src Sen.Sip6.Src
#define sen_ip6_dst Sen.Sip6.Dst
#define sen_ip6_proto Sen.Sip6.Proto
#define sen_ip6_sport Sen.Sip6.Sport
#define sen_ip6_dport Sen.Sip6.Dport
#define sen_ip6_direction Sen.Sip6.Direction
#define sen_ipsp Sen.PolicyHead
/*
* 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 IP4/6 plus SPI */
#define SENT_IP6 0x0004
#define SENT_LEN sizeof(struct sockaddr_encap)
struct ipsec_acquire
{
union sockaddr_union ipa_addr;
u_int64_t ipa_expire;
TAILQ_ENTRY(ipsec_acquire) ipa_next;
};
struct ipsec_policy
{
struct sockaddr_encap ipo_addr;
struct sockaddr_encap ipo_mask;
union sockaddr_union ipo_src; /* Local address to use */
union sockaddr_union ipo_dst; /* Remote gateway -- if it's zeroed:
* - on output, we try to contact the
* remote host directly (if needed).
* - on input, we accept on if the
* inner source is the same as the
* outer source address, or if transport
* mode was used.
*/
u_int64_t ipo_last_searched; /* Timestamp of last lookup */
u_int8_t ipo_flags; /* See IPSP_POLICY_* definitions */
u_int8_t ipo_type; /* USE/ACQUIRE/... */
u_int8_t ipo_sproto;/* ESP, AH; if zero we use system dflts */
struct tdb *ipo_tdb; /* Cached entry */
u_int16_t ipo_srcid_len;
u_int16_t ipo_dstid_len;
u_int16_t ipo_srcid_type;
u_int16_t ipo_dstid_type;
u_int8_t *ipo_srcid;
u_int8_t *ipo_dstid;
TAILQ_ENTRY(ipsec_policy) ipo_tdb_next; /* List of policies on TDB */
TAILQ_ENTRY(ipsec_policy) ipo_list; /* List of all policy entries */
};
#define IPSP_POLICY_NONE 0x0000 /* No flags set */
#define IPSP_IPSEC_USE 0 /* Use if existing, don't bother establishing */
#define IPSP_IPSEC_ACQUIRE 1 /* Try to acquire in parallel but let packet */
#define IPSP_IPSEC_REQUIRE 2 /* Require SA */
#define IPSP_PERMIT 3 /* Permit traffic through */
#define IPSP_DENY 4 /* Deny traffic */
#define IPSP_IPSEC_DONTACQ 5 /* Require, but don't acquire */
/* Notification types */
#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 tdb /* tunnel descriptor block */
{
/*
* Each TDB is on three hash tables: one keyed on dst/spi/sproto,
* one keyed on dst/sproto, and one keyed on src/sproto. The first
* is used for finding a specific TDB, the second for finding TDBs
* TDBs for outgoing policy matching, and the third for incoming
* policy matching. The following three fields maintain the hash
* queues in those three tables.
*/
struct tdb *tdb_hnext; /* dst/spi/sproto table */
struct tdb *tdb_anext; /* dst/sproto table */
struct tdb *tdb_snext; /* src/sproto table */
struct tdb *tdb_inext;
struct tdb *tdb_onext;
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 */
#define TDBF_NOREPLAY 0x02000 /* No replay counter present */
#define TDBF_RANDOMPADDING 0x04000 /* Random data in the ESP padding */
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_int64_t tdb_cryptoid; /* Crypto session ID */
u_int32_t tdb_spi; /* SPI */
u_int16_t tdb_amxkeylen; /* Raw authentication key length */
u_int16_t tdb_emxkeylen; /* Raw encryption key length */
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) */
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_srcid; /* Source ID for this SA */
u_int8_t *tdb_dstid; /* Destination ID for this SA */
u_int8_t *tdb_amxkey; /* Raw authentication key */
u_int8_t *tdb_emxkey; /* Raw encryption key */
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;
u_int8_t tdb_iv[4]; /* Used for HALF-IV ESP */
caddr_t tdb_interface;
TAILQ_HEAD(tdb_inp_head, inpcb) tdb_inp;
TAILQ_HEAD(tdb_policy_head, ipsec_policy) tdb_policy_head;
};
struct tdb_ident {
u_int32_t spi;
union sockaddr_union dst;
u_int8_t proto;
};
struct tdb_crypto {
u_int32_t tc_spi;
union sockaddr_union tc_dst;
u_int8_t tc_proto;
int tc_protoff;
int tc_skip;
caddr_t tc_ptr;
};
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 */
int (*xf_input)(struct mbuf *, struct tdb *, int, int); /* input */
int (*xf_output)(struct mbuf *, struct tdb *, struct mbuf **, int, int); /* output */
};
/* xform IDs */
#define XF_IP4 1 /* IP inside IP */
#define XF_AH 2 /* AH */
#define XF_ESP 3 /* ESP */
#define XF_TCPSIGNATURE 5 /* TCP MD5 Signature option, RFC 2358 */
/* xform attributes */
#define XFT_AUTH 0x0001
#define XFT_CONF 0x0100
#define IPSEC_ZEROES_SIZE 256 /* Larger than an IP6 extension hdr. */
#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 splsoftnet (note: do not use splsoftclock as it is
* special on some architectures, assuming it is always an spl lowering
* operation).
*/
#define spltdb splsoftnet
extern int encdebug;
extern int ipsec_acl;
extern int ipsec_keep_invalid;
extern int ipsec_in_use;
extern u_int64_t ipsec_last_added;
extern int ipsec_require_pfs;
extern int ipsec_expire_acquire;
extern int ipsec_soft_allocations;
extern int ipsec_exp_allocations;
extern int ipsec_soft_bytes;
extern int ipsec_exp_bytes;
extern int ipsec_soft_timeout;
extern int ipsec_exp_timeout;
extern int ipsec_soft_first_use;
extern int ipsec_exp_first_use;
extern char ipsec_def_enc[];
extern char ipsec_def_auth[];
extern struct enc_xform enc_xform_des;
extern struct enc_xform enc_xform_3des;
extern struct enc_xform enc_xform_blf;
extern struct enc_xform enc_xform_cast5;
extern struct enc_xform enc_xform_skipjack;
extern struct auth_hash auth_hash_hmac_md5_96;
extern struct auth_hash auth_hash_hmac_sha1_96;
extern struct auth_hash auth_hash_hmac_ripemd_160_96;
extern TAILQ_HEAD(expclusterlist_head, tdb) expclusterlist;
extern TAILQ_HEAD(explist_head, tdb) explist;
extern TAILQ_HEAD(ipsec_policy_head, ipsec_policy) ipsec_policy_head;
extern TAILQ_HEAD(ipsec_acquire_head, ipsec_acquire) ipsec_acquire_head;
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 struct tdb *gettdbbyaddr(union sockaddr_union *, u_int8_t,
struct mbuf *, int);
extern struct tdb *gettdbbysrc(union sockaddr_union *, u_int8_t,
struct mbuf *, int);
extern void puttdb(struct tdb *);
extern void tdb_delete(struct tdb *, 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 *);
/* 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 ipip_output(struct mbuf *, struct tdb *, struct mbuf **, int, int);
extern void ipe4_input __P((struct mbuf *, ...));
extern void ipip_input __P((struct mbuf *, int));
#ifdef INET
extern void ip4_input __P((struct mbuf *, ...));
#endif /* INET */
#ifdef INET6
extern int ip4_input6 __P((struct mbuf **, int *, int));
#endif /* INET */
/* XF_ETHERIP */
extern int etherip_output(struct mbuf *, struct tdb *, struct mbuf **,
int, int);
extern void etherip_input __P((struct mbuf *, ...));
/* XF_AH */
extern int ah_attach(void);
extern int ah_init(struct tdb *, struct xformsw *, struct ipsecinit *);
extern int ah_zeroize(struct tdb *);
extern int ah_output(struct mbuf *, struct tdb *, struct mbuf **, int, int);
extern int ah_output_cb(void *);
extern int ah_input(struct mbuf *, struct tdb *, int, int);
extern int ah_input_cb(void *);
extern int ah_sysctl(int *, u_int, void *, size_t *, void *, size_t);
extern int ah_massage_headers(struct mbuf **, int, int, int, int);
#ifdef INET
extern void ah4_input __P((struct mbuf *, ...));
extern int ah4_input_cb __P((struct mbuf *, ...));
#endif /* INET */
#ifdef INET6
extern int ah6_input __P((struct mbuf **, int *, int));
extern int ah6_input_cb __P((struct mbuf *, int, int));
#endif /* INET6 */
/* XF_ESP */
extern int esp_attach(void);
extern int esp_init(struct tdb *, struct xformsw *, struct ipsecinit *);
extern int esp_zeroize(struct tdb *);
extern int esp_output(struct mbuf *, struct tdb *, struct mbuf **, int, int);
extern int esp_output_cb(void *);
extern int esp_input(struct mbuf *, struct tdb *, int, int);
extern int esp_input_cb(void *);
extern int esp_sysctl(int *, u_int, void *, size_t *, void *, size_t);
#ifdef INET
extern void esp4_input __P((struct mbuf *, ...));
extern int esp4_input_cb __P((struct mbuf *, ...));
#endif /* INET */
#ifdef INET6
extern int esp6_input __P((struct mbuf **, int *, int));
extern int esp6_input_cb __P((struct mbuf *, int, int));
#endif /* INET6 */
/* 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 int tcp_signature_tdb_input __P((struct mbuf *, struct tdb *, int,
int));
extern int tcp_signature_tdb_output __P((struct mbuf *, struct tdb *,
struct mbuf **, int, int));
/* Padding */
extern caddr_t m_pad(struct mbuf *, 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[];
/* Packet processing */
extern int ipsp_process_packet(struct mbuf *, struct tdb *, int, int);
extern int ipsp_process_done(struct mbuf *, struct tdb *);
extern struct tdb *ipsp_spd_lookup(struct mbuf *, int, int, int *, int,
struct tdb *, struct inpcb *);
extern int ipsec_common_input_cb(struct mbuf *, struct tdb *, int, int);
extern int ipsp_acquire_sa(struct ipsec_policy *, union sockaddr_union *,
union sockaddr_union *);
extern struct ipsec_policy *ipsec_add_policy(struct sockaddr_encap *,
struct sockaddr_encap *,
union sockaddr_union *, int, int);
extern int ipsp_match_policy(struct tdb *, struct ipsec_policy *,
struct mbuf *, int);
extern void ipsp_acquire_expirations(void *);
extern int ipsec_delete_policy(struct ipsec_policy *);
#endif /* _KERNEL */
#endif /* _NETINET_IPSP_H_ */
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