1 /* $NetBSD: print-ah.c,v 1.4 1996/05/20 00:41:16 fvdl Exp $ */
2
3 /*
4 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994
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: IPSEC Authentication Header 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 #include "ah.h"
36
37 int
ah_print(netdissect_options * ndo,const u_char * bp)38 ah_print(netdissect_options *ndo, const u_char *bp)
39 {
40 const struct ah *ah;
41 uint8_t ah_len;
42 u_int ah_hdr_len;
43 uint16_t reserved;
44 const u_char *p;
45
46 ndo->ndo_protocol = "ah";
47 ah = (const struct ah *)bp;
48
49 nd_print_protocol_caps(ndo);
50 /*
51 * RFC4302
52 *
53 * 2.2. Payload Length
54 *
55 * This 8-bit field specifies the length of AH in 32-bit words (4-byte
56 * units), minus "2".
57 */
58 ah_len = GET_U_1(ah->ah_len);
59 ah_hdr_len = (ah_len + 2) * 4;
60
61 ND_PRINT("(");
62 if (ndo->ndo_vflag)
63 ND_PRINT("length=%u(%u-bytes),", ah_len, ah_hdr_len);
64 reserved = GET_BE_U_2(ah->ah_reserved);
65 if (reserved)
66 ND_PRINT("reserved=0x%x[MustBeZero],", reserved);
67 ND_PRINT("spi=0x%08x,", GET_BE_U_4(ah->ah_spi));
68 ND_PRINT("seq=0x%x,", GET_BE_U_4(ah->ah_seq));
69 ND_PRINT("icv=0x");
70 for (p = (const u_char *)(ah + 1); p < bp + ah_hdr_len; p++)
71 ND_PRINT("%02x", GET_U_1(p));
72 ND_PRINT("): ");
73
74 return ah_hdr_len;
75 }
76