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
76 struct 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
88 u_int
enc_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,register const u_char * p)89 enc_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
128 out:
129 return (ENC_HDRLEN);
130 }
131
132
133 /*
134 * Local Variables:
135 * c-style: whitesmith
136 * c-basic-offset: 8
137 * End:
138 */
139