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 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