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 #define NETDISSECT_REWORKED 23 #ifdef HAVE_CONFIG_H 24 #include "config.h" 25 #endif 26 27 #ifdef INET6 28 29 #include <tcpdump-stdinc.h> 30 31 #include <string.h> 32 33 #include "ip6.h" 34 35 #include "interface.h" 36 #include "addrtoname.h" 37 #include "extract.h" 38 39 int 40 rt6_print(netdissect_options *ndo, register const u_char *bp, const u_char *bp2 _U_) 41 { 42 register const struct ip6_rthdr *dp; 43 register const struct ip6_rthdr0 *dp0; 44 register const u_char *ep; 45 int i, len; 46 register const struct in6_addr *addr; 47 const struct in6_addr *last_addr = NULL; 48 49 dp = (struct ip6_rthdr *)bp; 50 len = dp->ip6r_len; 51 52 /* 'ep' points to the end of available data. */ 53 ep = ndo->ndo_snapend; 54 55 ND_TCHECK(dp->ip6r_segleft); 56 57 ND_PRINT((ndo, "srcrt (len=%d", dp->ip6r_len)); /*)*/ 58 ND_PRINT((ndo, ", type=%d", dp->ip6r_type)); 59 ND_PRINT((ndo, ", segleft=%d", dp->ip6r_segleft)); 60 61 switch (dp->ip6r_type) { 62 #ifndef IPV6_RTHDR_TYPE_0 63 #define IPV6_RTHDR_TYPE_0 0 64 #endif 65 #ifndef IPV6_RTHDR_TYPE_2 66 #define IPV6_RTHDR_TYPE_2 2 67 #endif 68 case IPV6_RTHDR_TYPE_0: 69 case IPV6_RTHDR_TYPE_2: /* Mobile IPv6 ID-20 */ 70 dp0 = (struct ip6_rthdr0 *)dp; 71 72 ND_TCHECK(dp0->ip6r0_reserved); 73 if (dp0->ip6r0_reserved || ndo->ndo_vflag) { 74 ND_PRINT((ndo, ", rsv=0x%0x", 75 EXTRACT_32BITS(&dp0->ip6r0_reserved))); 76 } 77 78 if (len % 2 == 1) 79 goto trunc; 80 len >>= 1; 81 addr = &dp0->ip6r0_addr[0]; 82 for (i = 0; i < len; i++) { 83 if ((u_char *)(addr + 1) > ep) 84 goto trunc; 85 86 ND_PRINT((ndo, ", [%d]%s", i, ip6addr_string(ndo, addr))); 87 last_addr = addr; 88 addr++; 89 } 90 /* 91 * the destination address used in the pseudo-header is that of the final 92 * destination : the last address of the routing header 93 */ 94 if (last_addr != NULL) { 95 struct ip6_hdr *ip6 = (struct ip6_hdr *)bp2; 96 UNALIGNED_MEMCPY(&ip6->ip6_dst, last_addr, sizeof (struct in6_addr)); 97 } 98 /*(*/ 99 ND_PRINT((ndo, ") ")); 100 return((dp0->ip6r0_len + 1) << 3); 101 break; 102 default: 103 goto trunc; 104 break; 105 } 106 107 trunc: 108 ND_PRINT((ndo, "[|srcrt]")); 109 return -1; 110 } 111 #endif /* INET6 */ 112
