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 #ifdef HAVE_CONFIG_H 31 #include "config.h" 32 #endif 33 34 #ifndef lint 35 static const char rcsid[] _U_ = 36 "@(#) $Header: /tcpdump/master/tcpdump/print-ip6opts.c,v 1.17.2.1 2005/04/20 22:19:06 guy Exp $"; 37 #endif 38 39 #ifdef INET6 40 #include <tcpdump-stdinc.h> 41 42 #include <stdio.h> 43 44 #include "ip6.h" 45 46 #include "interface.h" 47 #include "addrtoname.h" 48 #include "extract.h" 49 50 /* items outside of rfc2292bis */ 51 #ifndef IP6OPT_MINLEN 52 #define IP6OPT_MINLEN 2 53 #endif 54 #ifndef IP6OPT_RTALERT_LEN 55 #define IP6OPT_RTALERT_LEN 4 56 #endif 57 #ifndef IP6OPT_JUMBO_LEN 58 #define IP6OPT_JUMBO_LEN 6 59 #endif 60 #define IP6OPT_HOMEADDR_MINLEN 18 61 #define IP6OPT_BU_MINLEN 10 62 #define IP6OPT_BA_MINLEN 13 63 #define IP6OPT_BR_MINLEN 2 64 #define IP6SOPT_UI 0x2 65 #define IP6SOPT_UI_MINLEN 4 66 #define IP6SOPT_ALTCOA 0x3 67 #define IP6SOPT_ALTCOA_MINLEN 18 68 #define IP6SOPT_AUTH 0x4 69 #define IP6SOPT_AUTH_MINLEN 6 70 71 static void ip6_sopt_print(const u_char *, int); 72 73 static void 74 ip6_sopt_print(const u_char *bp, int len) 75 { 76 int i; 77 int optlen; 78 79 for (i = 0; i < len; i += optlen) { 80 if (bp[i] == IP6OPT_PAD1) 81 optlen = 1; 82 else { 83 if (i + 1 < len) 84 optlen = bp[i + 1] + 2; 85 else 86 goto trunc; 87 } 88 if (i + optlen > len) 89 goto trunc; 90 91 switch (bp[i]) { 92 case IP6OPT_PAD1: 93 printf(", pad1"); 94 break; 95 case IP6OPT_PADN: 96 if (len - i < IP6OPT_MINLEN) { 97 printf(", padn: trunc"); 98 goto trunc; 99 } 100 printf(", padn"); 101 break; 102 case IP6SOPT_UI: 103 if (len - i < IP6SOPT_UI_MINLEN) { 104 printf(", ui: trunc"); 105 goto trunc; 106 } 107 printf(", ui: 0x%04x ", EXTRACT_16BITS(&bp[i + 2])); 108 break; 109 case IP6SOPT_ALTCOA: 110 if (len - i < IP6SOPT_ALTCOA_MINLEN) { 111 printf(", altcoa: trunc"); 112 goto trunc; 113 } 114 printf(", alt-CoA: %s", ip6addr_string(&bp[i+2])); 115 break; 116 case IP6SOPT_AUTH: 117 if (len - i < IP6SOPT_AUTH_MINLEN) { 118 printf(", auth: trunc"); 119 goto trunc; 120 } 121 printf(", auth spi: 0x%08x", EXTRACT_32BITS(&bp[i + 2])); 122 break; 123 default: 124 if (len - i < IP6OPT_MINLEN) { 125 printf(", sopt_type %d: trunc)", bp[i]); 126 goto trunc; 127 } 128 printf(", sopt_type 0x%02x: len=%d", bp[i], bp[i + 1]); 129 break; 130 } 131 } 132 return; 133 134 trunc: 135 printf("[trunc] "); 136 } 137 138 void 139 ip6_opt_print(const u_char *bp, int len) 140 { 141 int i; 142 int optlen = 0; 143 144 for (i = 0; i < len; i += optlen) { 145 if (bp[i] == IP6OPT_PAD1) 146 optlen = 1; 147 else { 148 if (i + 1 < len) 149 optlen = bp[i + 1] + 2; 150 else 151 goto trunc; 152 } 153 if (i + optlen > len) 154 goto trunc; 155 156 switch (bp[i]) { 157 case IP6OPT_PAD1: 158 printf("(pad1)"); 159 break; 160 case IP6OPT_PADN: 161 if (len - i < IP6OPT_MINLEN) { 162 printf("(padn: trunc)"); 163 goto trunc; 164 } 165 printf("(padn)"); 166 break; 167 case IP6OPT_ROUTER_ALERT: 168 if (len - i < IP6OPT_RTALERT_LEN) { 169 printf("(rtalert: trunc)"); 170 goto trunc; 171 } 172 if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) { 173 printf("(rtalert: invalid len %d)", bp[i + 1]); 174 goto trunc; 175 } 176 printf("(rtalert: 0x%04x) ", EXTRACT_16BITS(&bp[i + 2])); 177 break; 178 case IP6OPT_JUMBO: 179 if (len - i < IP6OPT_JUMBO_LEN) { 180 printf("(jumbo: trunc)"); 181 goto trunc; 182 } 183 if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) { 184 printf("(jumbo: invalid len %d)", bp[i + 1]); 185 goto trunc; 186 } 187 printf("(jumbo: %u) ", EXTRACT_32BITS(&bp[i + 2])); 188 break; 189 case IP6OPT_HOME_ADDRESS: 190 if (len - i < IP6OPT_HOMEADDR_MINLEN) { 191 printf("(homeaddr: trunc)"); 192 goto trunc; 193 } 194 if (bp[i + 1] < IP6OPT_HOMEADDR_MINLEN - 2) { 195 printf("(homeaddr: invalid len %d)", bp[i + 1]); 196 goto trunc; 197 } 198 printf("(homeaddr: %s", ip6addr_string(&bp[i + 2])); 199 if (bp[i + 1] > IP6OPT_HOMEADDR_MINLEN - 2) { 200 ip6_sopt_print(&bp[i + IP6OPT_HOMEADDR_MINLEN], 201 (optlen - IP6OPT_HOMEADDR_MINLEN)); 202 } 203 printf(")"); 204 break; 205 case IP6OPT_BINDING_UPDATE: 206 if (len - i < IP6OPT_BU_MINLEN) { 207 printf("(bu: trunc)"); 208 goto trunc; 209 } 210 if (bp[i + 1] < IP6OPT_BU_MINLEN - 2) { 211 printf("(bu: invalid len %d)", bp[i + 1]); 212 goto trunc; 213 } 214 printf("(bu: "); 215 if (bp[i + 2] & 0x80) 216 printf("A"); 217 if (bp[i + 2] & 0x40) 218 printf("H"); 219 if (bp[i + 2] & 0x20) 220 printf("S"); 221 if (bp[i + 2] & 0x10) 222 printf("D"); 223 if ((bp[i + 2] & 0x0f) || bp[i + 3] || bp[i + 4]) 224 printf("res"); 225 printf(", sequence: %u", bp[i + 5]); 226 printf(", lifetime: %u", EXTRACT_32BITS(&bp[i + 6])); 227 228 if (bp[i + 1] > IP6OPT_BU_MINLEN - 2) { 229 ip6_sopt_print(&bp[i + IP6OPT_BU_MINLEN], 230 (optlen - IP6OPT_BU_MINLEN)); 231 } 232 printf(")"); 233 break; 234 case IP6OPT_BINDING_ACK: 235 if (len - i < IP6OPT_BA_MINLEN) { 236 printf("(ba: trunc)"); 237 goto trunc; 238 } 239 if (bp[i + 1] < IP6OPT_BA_MINLEN - 2) { 240 printf("(ba: invalid len %d)", bp[i + 1]); 241 goto trunc; 242 } 243 printf("(ba: "); 244 printf("status: %u", bp[i + 2]); 245 if (bp[i + 3]) 246 printf("res"); 247 printf(", sequence: %u", bp[i + 4]); 248 printf(", lifetime: %u", EXTRACT_32BITS(&bp[i + 5])); 249 printf(", refresh: %u", EXTRACT_32BITS(&bp[i + 9])); 250 251 if (bp[i + 1] > IP6OPT_BA_MINLEN - 2) { 252 ip6_sopt_print(&bp[i + IP6OPT_BA_MINLEN], 253 (optlen - IP6OPT_BA_MINLEN)); 254 } 255 printf(")"); 256 break; 257 case IP6OPT_BINDING_REQ: 258 if (len - i < IP6OPT_BR_MINLEN) { 259 printf("(br: trunc)"); 260 goto trunc; 261 } 262 printf("(br"); 263 if (bp[i + 1] > IP6OPT_BR_MINLEN - 2) { 264 ip6_sopt_print(&bp[i + IP6OPT_BR_MINLEN], 265 (optlen - IP6OPT_BR_MINLEN)); 266 } 267 printf(")"); 268 break; 269 default: 270 if (len - i < IP6OPT_MINLEN) { 271 printf("(type %d: trunc)", bp[i]); 272 goto trunc; 273 } 274 printf("(opt_type 0x%02x: len=%d) ", bp[i], bp[i + 1]); 275 break; 276 } 277 } 278 279 #if 0 280 end: 281 #endif 282 return; 283 284 trunc: 285 printf("[trunc] "); 286 } 287 288 int 289 hbhopt_print(register const u_char *bp) 290 { 291 const struct ip6_hbh *dp = (struct ip6_hbh *)bp; 292 int hbhlen = 0; 293 294 TCHECK(dp->ip6h_len); 295 hbhlen = (int)((dp->ip6h_len + 1) << 3); 296 TCHECK2(*dp, hbhlen); 297 printf("HBH "); 298 if (vflag) 299 ip6_opt_print((const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp)); 300 301 return(hbhlen); 302 303 trunc: 304 fputs("[|HBH]", stdout); 305 return(-1); 306 } 307 308 int 309 dstopt_print(register const u_char *bp) 310 { 311 const struct ip6_dest *dp = (struct ip6_dest *)bp; 312 int dstoptlen = 0; 313 314 TCHECK(dp->ip6d_len); 315 dstoptlen = (int)((dp->ip6d_len + 1) << 3); 316 TCHECK2(*dp, dstoptlen); 317 printf("DSTOPT "); 318 if (vflag) { 319 ip6_opt_print((const u_char *)dp + sizeof(*dp), 320 dstoptlen - sizeof(*dp)); 321 } 322 323 return(dstoptlen); 324 325 trunc: 326 fputs("[|DSTOPT]", stdout); 327 return(-1); 328 } 329 #endif /* INET6 */ 330
