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 #ifndef lint 23 static const char rcsid[] = 24 "@(#) $Header: /tcpdump/master/tcpdump/print-frag6.c,v 1.12 2000/10/07 05:53:10 itojun Exp $"; 25 #endif 26 27 #ifdef HAVE_CONFIG_H 28 #include "config.h" 29 #endif 30 31 #ifdef INET6 32 33 #include <sys/param.h> 34 #include <sys/time.h> 35 #include <sys/types.h> 36 #include <sys/socket.h> 37 38 39 #include <netinet/in.h> 40 41 #include <stdio.h> 42 43 #include "ip6.h" 44 45 #include "interface.h" 46 #include "addrtoname.h" 47 48 int 49 frag6_print(register const u_char *bp, register const u_char *bp2) 50 { 51 register const struct ip6_frag *dp; 52 register const struct ip6_hdr *ip6; 53 register const u_char *ep; 54 55 #if 0 56 #define TCHECK(var) if ((u_char *)&(var) >= ep - sizeof(var)) goto trunc 57 #endif 58 59 dp = (struct ip6_frag *)bp; 60 ip6 = (struct ip6_hdr *)bp2; 61 62 /* 'ep' points to the end of available data. */ 63 ep = snapend; 64 65 TCHECK(dp->ip6f_offlg); 66 67 if (vflag) { 68 printf("frag (0x%08x:%d|%ld)", 69 (u_int32_t)ntohl(dp->ip6f_ident), 70 ntohs(dp->ip6f_offlg & IP6F_OFF_MASK), 71 sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) - 72 (long)(bp - bp2) - sizeof(struct ip6_frag)); 73 } else { 74 printf("frag (%d|%ld)", 75 ntohs(dp->ip6f_offlg & IP6F_OFF_MASK), 76 sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) - 77 (long)(bp - bp2) - sizeof(struct ip6_frag)); 78 } 79 80 #if 1 81 /* it is meaningless to decode non-first fragment */ 82 if (ntohs(dp->ip6f_offlg & IP6F_OFF_MASK) != 0) 83 return 65535; 84 else 85 #endif 86 { 87 fputs(" ", stdout); 88 return sizeof(struct ip6_frag); 89 } 90 trunc: 91 fputs("[|frag]", stdout); 92 return 65535; 93 #undef TCHECK 94 } 95 #endif /* INET6 */ 96