1 /* 2 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 */ 21 22 #include <sys/cdefs.h> 23 #ifndef lint 24 __RCSID("$NetBSD: print-frag6.c,v 1.6 2017/02/05 04:05:05 spz Exp $"); 25 #endif 26 27 /* \summary: IPv6 fragmentation header printer */ 28 29 #ifdef HAVE_CONFIG_H 30 #include "config.h" 31 #endif 32 33 #include <netdissect-stdinc.h> 34 35 #include "ip6.h" 36 #include "netdissect.h" 37 #include "extract.h" 38 39 int 40 frag6_print(netdissect_options *ndo, register const u_char *bp, register const u_char *bp2) 41 { 42 register const struct ip6_frag *dp; 43 register const struct ip6_hdr *ip6; 44 45 dp = (const struct ip6_frag *)bp; 46 ip6 = (const struct ip6_hdr *)bp2; 47 48 ND_TCHECK(dp->ip6f_offlg); 49 50 if (ndo->ndo_vflag) { 51 ND_PRINT((ndo, "frag (0x%08x:%d|%ld)", 52 EXTRACT_32BITS(&dp->ip6f_ident), 53 EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK, 54 sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen) - 55 (long)(bp - bp2) - sizeof(struct ip6_frag))); 56 } else { 57 ND_PRINT((ndo, "frag (%d|%ld)", 58 EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK, 59 sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen) - 60 (long)(bp - bp2) - sizeof(struct ip6_frag))); 61 } 62 63 /* it is meaningless to decode non-first fragment */ 64 if ((EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK) != 0) 65 return -1; 66 else 67 { 68 ND_PRINT((ndo, " ")); 69 return sizeof(struct ip6_frag); 70 } 71 trunc: 72 ND_PRINT((ndo, "[|frag]")); 73 return -1; 74 } 75