1/*	$OpenBSD: print-enc.c,v 1.7 2002/02/19 19:39:40 millert Exp $	*/
2
3/*
4 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that: (1) source code distributions
9 * retain the above copyright notice and this paragraph in its entirety, (2)
10 * distributions including binary code include the above copyright notice and
11 * this paragraph in its entirety in the documentation or other materials
12 * provided with the distribution, and (3) all advertising materials mentioning
13 * features or use of this software display the following acknowledgement:
14 * ``This product includes software developed by the University of California,
15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
16 * the University nor the names of its contributors may be used to endorse
17 * or promote products derived from this software without specific prior
18 * written permission.
19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
22 */
23
24/* \summary: OpenBSD IPsec encapsulation BPF layer printer */
25
26#ifdef HAVE_CONFIG_H
27#include "config.h"
28#endif
29
30#include <netdissect-stdinc.h>
31
32#include "netdissect.h"
33#include "extract.h"
34
35/* From $OpenBSD: if_enc.h,v 1.8 2001/06/25 05:14:00 angelos Exp $ */
36/*
37 * The authors of this code are John Ioannidis (ji@tla.org),
38 * Angelos D. Keromytis (kermit@csd.uch.gr) and
39 * Niels Provos (provos@physnet.uni-hamburg.de).
40 *
41 * This code was written by John Ioannidis for BSD/OS in Athens, Greece,
42 * in November 1995.
43 *
44 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
45 * by Angelos D. Keromytis.
46 *
47 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
48 * and Niels Provos.
49 *
50 * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
51 * and Niels Provos.
52 * Copyright (c) 2001, Angelos D. Keromytis.
53 *
54 * Permission to use, copy, and modify this software with or without fee
55 * is hereby granted, provided that this entire notice is included in
56 * all copies of any software which is or includes a copy or
57 * modification of this software.
58 * You may use this code under the GNU public license if you so wish. Please
59 * contribute changes back to the authors under this freer than GPL license
60 * so that we may further the use of strong encryption without limitations to
61 * all.
62 *
63 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
64 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
65 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
66 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
67 * PURPOSE.
68 */
69
70#define ENC_HDRLEN	12
71
72/* From $OpenBSD: mbuf.h,v 1.56 2002/01/25 15:50:23 art Exp $	*/
73#define M_CONF		0x0400  /* packet was encrypted (ESP-transport) */
74#define M_AUTH		0x0800  /* packet was authenticated (AH) */
75
76struct enchdr {
77	uint32_t af;
78	uint32_t spi;
79	uint32_t flags;
80};
81
82#define ENC_PRINT_TYPE(wh, xf, nam) \
83	if ((wh) & (xf)) { \
84		ND_PRINT((ndo, "%s%s", nam, (wh) == (xf) ? "): " : ",")); \
85		(wh) &= ~(xf); \
86	}
87
88u_int
89enc_if_print(netdissect_options *ndo,
90             const struct pcap_pkthdr *h, register const u_char *p)
91{
92	register u_int length = h->len;
93	register u_int caplen = h->caplen;
94	int flags;
95	const struct enchdr *hdr;
96
97	if (caplen < ENC_HDRLEN) {
98		ND_PRINT((ndo, "[|enc]"));
99		goto out;
100	}
101
102	hdr = (const struct enchdr *)p;
103	flags = hdr->flags;
104	if (flags == 0)
105		ND_PRINT((ndo, "(unprotected): "));
106	else
107		ND_PRINT((ndo, "("));
108	ENC_PRINT_TYPE(flags, M_AUTH, "authentic");
109	ENC_PRINT_TYPE(flags, M_CONF, "confidential");
110	/* ENC_PRINT_TYPE(flags, M_TUNNEL, "tunnel"); */
111	ND_PRINT((ndo, "SPI 0x%08x: ", EXTRACT_32BITS(&hdr->spi)));
112
113	length -= ENC_HDRLEN;
114	caplen -= ENC_HDRLEN;
115	p += ENC_HDRLEN;
116
117	switch (hdr->af) {
118	case AF_INET:
119		ip_print(ndo, p, length);
120		break;
121#ifdef AF_INET6
122	case AF_INET6:
123		ip6_print(ndo, p, length);
124		break;
125#endif
126	}
127
128out:
129	return (ENC_HDRLEN);
130}
131
132
133/*
134 * Local Variables:
135 * c-style: whitesmith
136 * c-basic-offset: 8
137 * End:
138 */
139