1 /* 2 * Copyright (C) 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #define NETDISSECT_REWORKED 31 #ifdef HAVE_CONFIG_H 32 #include "config.h" 33 #endif 34 35 #ifdef INET6 36 #include <tcpdump-stdinc.h> 37 38 #include "ip6.h" 39 40 #include "interface.h" 41 #include "addrtoname.h" 42 #include "extract.h" 43 44 static void 45 ip6_sopt_print(netdissect_options *ndo, const u_char *bp, int len) 46 { 47 int i; 48 int optlen; 49 50 for (i = 0; i < len; i += optlen) { 51 if (bp[i] == IP6OPT_PAD1) 52 optlen = 1; 53 else { 54 if (i + 1 < len) 55 optlen = bp[i + 1] + 2; 56 else 57 goto trunc; 58 } 59 if (i + optlen > len) 60 goto trunc; 61 62 switch (bp[i]) { 63 case IP6OPT_PAD1: 64 ND_PRINT((ndo, ", pad1")); 65 break; 66 case IP6OPT_PADN: 67 if (len - i < IP6OPT_MINLEN) { 68 ND_PRINT((ndo, ", padn: trunc")); 69 goto trunc; 70 } 71 ND_PRINT((ndo, ", padn")); 72 break; 73 default: 74 if (len - i < IP6OPT_MINLEN) { 75 ND_PRINT((ndo, ", sopt_type %d: trunc)", bp[i])); 76 goto trunc; 77 } 78 ND_PRINT((ndo, ", sopt_type 0x%02x: len=%d", bp[i], bp[i + 1])); 79 break; 80 } 81 } 82 return; 83 84 trunc: 85 ND_PRINT((ndo, "[trunc] ")); 86 } 87 88 static void 89 ip6_opt_print(netdissect_options *ndo, const u_char *bp, int len) 90 { 91 int i; 92 int optlen = 0; 93 94 if (len == 0) 95 return; 96 for (i = 0; i < len; i += optlen) { 97 if (bp[i] == IP6OPT_PAD1) 98 optlen = 1; 99 else { 100 if (i + 1 < len) 101 optlen = bp[i + 1] + 2; 102 else 103 goto trunc; 104 } 105 if (i + optlen > len) 106 goto trunc; 107 108 switch (bp[i]) { 109 case IP6OPT_PAD1: 110 ND_PRINT((ndo, "(pad1)")); 111 break; 112 case IP6OPT_PADN: 113 if (len - i < IP6OPT_MINLEN) { 114 ND_PRINT((ndo, "(padn: trunc)")); 115 goto trunc; 116 } 117 ND_PRINT((ndo, "(padn)")); 118 break; 119 case IP6OPT_ROUTER_ALERT: 120 if (len - i < IP6OPT_RTALERT_LEN) { 121 ND_PRINT((ndo, "(rtalert: trunc)")); 122 goto trunc; 123 } 124 if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) { 125 ND_PRINT((ndo, "(rtalert: invalid len %d)", bp[i + 1])); 126 goto trunc; 127 } 128 ND_PRINT((ndo, "(rtalert: 0x%04x) ", EXTRACT_16BITS(&bp[i + 2]))); 129 break; 130 case IP6OPT_JUMBO: 131 if (len - i < IP6OPT_JUMBO_LEN) { 132 ND_PRINT((ndo, "(jumbo: trunc)")); 133 goto trunc; 134 } 135 if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) { 136 ND_PRINT((ndo, "(jumbo: invalid len %d)", bp[i + 1])); 137 goto trunc; 138 } 139 ND_PRINT((ndo, "(jumbo: %u) ", EXTRACT_32BITS(&bp[i + 2]))); 140 break; 141 case IP6OPT_HOME_ADDRESS: 142 if (len - i < IP6OPT_HOMEADDR_MINLEN) { 143 ND_PRINT((ndo, "(homeaddr: trunc)")); 144 goto trunc; 145 } 146 if (bp[i + 1] < IP6OPT_HOMEADDR_MINLEN - 2) { 147 ND_PRINT((ndo, "(homeaddr: invalid len %d)", bp[i + 1])); 148 goto trunc; 149 } 150 ND_PRINT((ndo, "(homeaddr: %s", ip6addr_string(ndo, &bp[i + 2]))); 151 if (bp[i + 1] > IP6OPT_HOMEADDR_MINLEN - 2) { 152 ip6_sopt_print(ndo, &bp[i + IP6OPT_HOMEADDR_MINLEN], 153 (optlen - IP6OPT_HOMEADDR_MINLEN)); 154 } 155 ND_PRINT((ndo, ")")); 156 break; 157 default: 158 if (len - i < IP6OPT_MINLEN) { 159 ND_PRINT((ndo, "(type %d: trunc)", bp[i])); 160 goto trunc; 161 } 162 ND_PRINT((ndo, "(opt_type 0x%02x: len=%d)", bp[i], bp[i + 1])); 163 break; 164 } 165 } 166 ND_PRINT((ndo, " ")); 167 return; 168 169 trunc: 170 ND_PRINT((ndo, "[trunc] ")); 171 } 172 173 int 174 hbhopt_print(netdissect_options *ndo, register const u_char *bp) 175 { 176 const struct ip6_hbh *dp = (struct ip6_hbh *)bp; 177 int hbhlen = 0; 178 179 ND_TCHECK(dp->ip6h_len); 180 hbhlen = (int)((dp->ip6h_len + 1) << 3); 181 ND_TCHECK2(*dp, hbhlen); 182 ND_PRINT((ndo, "HBH ")); 183 if (ndo->ndo_vflag) 184 ip6_opt_print(ndo, (const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp)); 185 186 return(hbhlen); 187 188 trunc: 189 ND_PRINT((ndo, "[|HBH]")); 190 return(-1); 191 } 192 193 int 194 dstopt_print(netdissect_options *ndo, register const u_char *bp) 195 { 196 const struct ip6_dest *dp = (struct ip6_dest *)bp; 197 int dstoptlen = 0; 198 199 ND_TCHECK(dp->ip6d_len); 200 dstoptlen = (int)((dp->ip6d_len + 1) << 3); 201 ND_TCHECK2(*dp, dstoptlen); 202 ND_PRINT((ndo, "DSTOPT ")); 203 if (ndo->ndo_vflag) { 204 ip6_opt_print(ndo, (const u_char *)dp + sizeof(*dp), 205 dstoptlen - sizeof(*dp)); 206 } 207 208 return(dstoptlen); 209 210 trunc: 211 ND_PRINT((ndo, "[|DSTOPT]")); 212 return(-1); 213 } 214 #endif /* INET6 */ 215
