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 /* \summary: IPv6 fragmentation header printer */ 23 24 #ifdef HAVE_CONFIG_H 25 #include <config.h> 26 #endif 27 28 #include "netdissect-stdinc.h" 29 30 #include "netdissect.h" 31 #include "extract.h" 32 33 #include "ip6.h" 34 35 int 36 frag6_print(netdissect_options *ndo, const u_char *bp, const u_char *bp2) 37 { 38 const struct ip6_frag *dp; 39 const struct ip6_hdr *ip6; 40 41 ndo->ndo_protocol = "frag6"; 42 dp = (const struct ip6_frag *)bp; 43 ip6 = (const struct ip6_hdr *)bp2; 44 45 if (ndo->ndo_vflag) { 46 ND_PRINT("frag (0x%08x:%u|%zu)", 47 GET_BE_U_4(dp->ip6f_ident), 48 GET_BE_U_2(dp->ip6f_offlg) & IP6F_OFF_MASK, 49 sizeof(struct ip6_hdr) + GET_BE_U_2(ip6->ip6_plen) - 50 (bp - bp2) - sizeof(struct ip6_frag)); 51 } else { 52 ND_PRINT("frag (%u|%zu)", 53 GET_BE_U_2(dp->ip6f_offlg) & IP6F_OFF_MASK, 54 sizeof(struct ip6_hdr) + GET_BE_U_2(ip6->ip6_plen) - 55 (bp - bp2) - sizeof(struct ip6_frag)); 56 } 57 58 /* it is meaningless to decode non-first fragment */ 59 if ((GET_BE_U_2(dp->ip6f_offlg) & IP6F_OFF_MASK) != 0) 60 return -1; 61 else 62 { 63 ND_PRINT(" "); 64 return sizeof(struct ip6_frag); 65 } 66 } 67