| /* $NetBSD: print-ah.c,v 1.4 1996/05/20 00:41:16 fvdl Exp $ */ |
| |
| /* |
| * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that: (1) source code distributions |
| * retain the above copyright notice and this paragraph in its entirety, (2) |
| * distributions including binary code include the above copyright notice and |
| * this paragraph in its entirety in the documentation or other materials |
| * provided with the distribution, and (3) all advertising materials mentioning |
| * features or use of this software display the following acknowledgement: |
| * ``This product includes software developed by the University of California, |
| * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| * the University nor the names of its contributors may be used to endorse |
| * or promote products derived from this software without specific prior |
| * written permission. |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| */ |
| |
| /* \summary: IPSEC Authentication Header printer */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| |
| #include "netdissect-stdinc.h" |
| |
| #include "netdissect.h" |
| #include "extract.h" |
| |
| #include "ah.h" |
| |
| int |
| ah_print(netdissect_options *ndo, const u_char *bp) |
| { |
| const struct ah *ah; |
| uint8_t ah_len; |
| u_int ah_hdr_len; |
| uint16_t reserved; |
| const u_char *p; |
| |
| ndo->ndo_protocol = "ah"; |
| ah = (const struct ah *)bp; |
| |
| nd_print_protocol_caps(ndo); |
| /* |
| * RFC4302 |
| * |
| * 2.2. Payload Length |
| * |
| * This 8-bit field specifies the length of AH in 32-bit words (4-byte |
| * units), minus "2". |
| */ |
| ah_len = GET_U_1(ah->ah_len); |
| ah_hdr_len = (ah_len + 2) * 4; |
| |
| ND_PRINT("("); |
| if (ndo->ndo_vflag) |
| ND_PRINT("length=%u(%u-bytes),", ah_len, ah_hdr_len); |
| reserved = GET_BE_U_2(ah->ah_reserved); |
| if (reserved) |
| ND_PRINT("reserved=0x%x[MustBeZero],", reserved); |
| ND_PRINT("spi=0x%08x,", GET_BE_U_4(ah->ah_spi)); |
| ND_PRINT("seq=0x%x,", GET_BE_U_4(ah->ah_seq)); |
| ND_PRINT("icv=0x"); |
| for (p = (const u_char *)(ah + 1); p < bp + ah_hdr_len; p++) |
| ND_PRINT("%02x", GET_U_1(p)); |
| ND_PRINT("): "); |
| |
| return ah_hdr_len; |
| } |