05fda2a0bf
bpf will see inner and outer headers or just inner or outer headers for incoming and outgoing IPsec packets. This is useful in bpf to not have over long lines for debugging or selcting packets based on the inner headers. It also properly defines the behavior of what the firewalls see. Last but not least it gives you if_enc(4) for IPv6 as well. [ As some auxiliary state was not available in the later input path we save it in the tdbi. That way tcpdump can give a consistent view of either of (authentic,confidential) for both before and after states. ] Discussed with: thompsa (2007-04-25, basic idea of unifying paths) Reviewed by: thompsa, gnn
130 lines
4.2 KiB
C
130 lines
4.2 KiB
C
/* $FreeBSD$ */
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/* $OpenBSD: ip_ipsp.h,v 1.119 2002/03/14 01:27:11 millert Exp $ */
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/*-
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* The authors of this code are John Ioannidis (ji@tla.org),
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* Angelos D. Keromytis (kermit@csd.uch.gr),
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* Niels Provos (provos@physnet.uni-hamburg.de) and
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* Niklas Hallqvist (niklas@appli.se).
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*
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* The original version of this code was written by John Ioannidis
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* for BSD/OS in Athens, Greece, in November 1995.
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*
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* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
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* by Angelos D. Keromytis.
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*
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* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
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* and Niels Provos.
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*
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* Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist.
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*
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* Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
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* Angelos D. Keromytis and Niels Provos.
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* Copyright (c) 1999 Niklas Hallqvist.
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* Copyright (c) 2001, Angelos D. Keromytis.
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*
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* Permission to use, copy, and modify this software with or without fee
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* is hereby granted, provided that this entire notice is included in
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* all copies of any software which is or includes a copy or
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* modification of this software.
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* You may use this code under the GNU public license if you so wish. Please
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* contribute changes back to the authors under this freer than GPL license
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* so that we may further the use of strong encryption without limitations to
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* all.
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*
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* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
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* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
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* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
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* PURPOSE.
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*/
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#ifndef _NETIPSEC_XFORM_H_
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#define _NETIPSEC_XFORM_H_
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <opencrypto/xform.h>
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#define AH_HMAC_HASHLEN 12 /* 96 bits of authenticator */
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#define AH_HMAC_INITIAL_RPL 1 /* replay counter initial value */
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/*
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* Packet tag assigned on completion of IPsec processing; used
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* to speedup processing when/if the packet comes back for more
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* processing.
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*/
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struct tdb_ident {
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u_int32_t spi;
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union sockaddr_union dst;
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u_int8_t proto;
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/* Cache those two for enc(4) in xform_ipip. */
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u_int8_t alg_auth;
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u_int8_t alg_enc;
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};
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/*
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* Opaque data structure hung off a crypto operation descriptor.
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*/
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struct tdb_crypto {
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struct ipsecrequest *tc_isr; /* ipsec request state */
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u_int32_t tc_spi; /* associated SPI */
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union sockaddr_union tc_dst; /* dst addr of packet */
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u_int8_t tc_proto; /* current protocol, e.g. AH */
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u_int8_t tc_nxt; /* next protocol, e.g. IPV4 */
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int tc_protoff; /* current protocol offset */
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int tc_skip; /* data offset */
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caddr_t tc_ptr; /* associated crypto data */
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};
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struct secasvar;
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struct ipescrequest;
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struct xformsw {
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u_short xf_type; /* xform ID */
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#define XF_IP4 1 /* IP inside IP */
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#define XF_AH 2 /* AH */
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#define XF_ESP 3 /* ESP */
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#define XF_TCPSIGNATURE 5 /* TCP MD5 Signature option, RFC 2358 */
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#define XF_IPCOMP 6 /* IPCOMP */
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u_short xf_flags;
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#define XFT_AUTH 0x0001
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#define XFT_CONF 0x0100
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#define XFT_COMP 0x1000
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char *xf_name; /* human-readable name */
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int (*xf_init)(struct secasvar*, struct xformsw*); /* setup */
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int (*xf_zeroize)(struct secasvar*); /* cleanup */
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int (*xf_input)(struct mbuf*, struct secasvar*, /* input */
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int, int);
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int (*xf_output)(struct mbuf*, /* output */
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struct ipsecrequest *, struct mbuf **, int, int);
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struct xformsw *xf_next; /* list of registered xforms */
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};
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#ifdef _KERNEL
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extern void xform_register(struct xformsw*);
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extern int xform_init(struct secasvar *sav, int xftype);
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struct cryptoini;
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/* XF_IP4 */
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extern int ip4_input6(struct mbuf **m, int *offp, int proto);
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extern void ip4_input(struct mbuf *m, int);
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extern int ipip_output(struct mbuf *, struct ipsecrequest *,
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struct mbuf **, int, int);
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/* XF_AH */
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extern int ah_init0(struct secasvar *, struct xformsw *, struct cryptoini *);
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extern int ah_zeroize(struct secasvar *sav);
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extern struct auth_hash *ah_algorithm_lookup(int alg);
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extern size_t ah_hdrsiz(struct secasvar *);
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/* XF_ESP */
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extern struct enc_xform *esp_algorithm_lookup(int alg);
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extern size_t esp_hdrsiz(struct secasvar *sav);
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/* XF_COMP */
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extern struct comp_algo *ipcomp_algorithm_lookup(int alg);
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#endif /* _KERNEL */
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#endif /* _NETIPSEC_XFORM_H_ */
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