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-rt6.c,v 1.4 2014/11/20 03:05:03 christos Exp $"); 25 #endif 26 27 #define NETDISSECT_REWORKED 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #ifdef INET6 33 34 #include <tcpdump-stdinc.h> 35 36 #include <string.h> 37 38 #include "ip6.h" 39 40 #include "interface.h" 41 #include "addrtoname.h" 42 #include "extract.h" 43 44 int 45 rt6_print(netdissect_options *ndo, register const u_char *bp, const u_char *bp2 _U_) 46 { 47 register const struct ip6_rthdr *dp; 48 register const struct ip6_rthdr0 *dp0; 49 register const u_char *ep; 50 int i, len; 51 register const struct in6_addr *addr; 52 const struct in6_addr *last_addr = NULL; 53 54 dp = (struct ip6_rthdr *)bp; 55 len = dp->ip6r_len; 56 57 /* 'ep' points to the end of available data. */ 58 ep = ndo->ndo_snapend; 59 60 ND_TCHECK(dp->ip6r_segleft); 61 62 ND_PRINT((ndo, "srcrt (len=%d", dp->ip6r_len)); /*)*/ 63 ND_PRINT((ndo, ", type=%d", dp->ip6r_type)); 64 ND_PRINT((ndo, ", segleft=%d", dp->ip6r_segleft)); 65 66 switch (dp->ip6r_type) { 67 #ifndef IPV6_RTHDR_TYPE_0 68 #define IPV6_RTHDR_TYPE_0 0 69 #endif 70 #ifndef IPV6_RTHDR_TYPE_2 71 #define IPV6_RTHDR_TYPE_2 2 72 #endif 73 case IPV6_RTHDR_TYPE_0: 74 case IPV6_RTHDR_TYPE_2: /* Mobile IPv6 ID-20 */ 75 dp0 = (struct ip6_rthdr0 *)dp; 76 77 ND_TCHECK(dp0->ip6r0_reserved); 78 if (dp0->ip6r0_reserved || ndo->ndo_vflag) { 79 ND_PRINT((ndo, ", rsv=0x%0x", 80 EXTRACT_32BITS(&dp0->ip6r0_reserved))); 81 } 82 83 if (len % 2 == 1) 84 goto trunc; 85 len >>= 1; 86 addr = &dp0->ip6r0_addr[0]; 87 for (i = 0; i < len; i++) { 88 if ((u_char *)(addr + 1) > ep) 89 goto trunc; 90 91 ND_PRINT((ndo, ", [%d]%s", i, ip6addr_string(ndo, addr))); 92 last_addr = addr; 93 addr++; 94 } 95 /* 96 * the destination address used in the pseudo-header is that of the final 97 * destination : the last address of the routing header 98 */ 99 if (last_addr != NULL) { 100 struct ip6_hdr *ip6 = (struct ip6_hdr *)bp2; 101 UNALIGNED_MEMCPY(&ip6->ip6_dst, last_addr, sizeof (struct in6_addr)); 102 } 103 /*(*/ 104 ND_PRINT((ndo, ") ")); 105 return((dp0->ip6r0_len + 1) << 3); 106 break; 107 default: 108 goto trunc; 109 break; 110 } 111 112 trunc: 113 ND_PRINT((ndo, "[|srcrt]")); 114 return -1; 115 } 116 #endif /* INET6 */ 117