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[] = 36 "@(#) $Header: /tcpdump/master/tcpdump/print-ip6opts.c,v 1.8 2000/12/13 07:57:05 itojun Exp $"; 37 #endif 38 39 #ifdef INET6 40 #include <sys/param.h> 41 #include <sys/time.h> 42 #include <sys/types.h> 43 #include <sys/socket.h> 44 45 #include <netinet/in.h> 46 #include <stdio.h> 47 48 #include "ip6.h" 49 50 #include "interface.h" 51 #include "addrtoname.h" 52 53 /* items outside of rfc2292bis */ 54 #ifndef IP6OPT_MINLEN 55 #define IP6OPT_MINLEN 2 56 #endif 57 #ifndef IP6OPT_RTALERT_LEN 58 #define IP6OPT_RTALERT_LEN 4 59 #endif 60 #ifndef IP6OPT_JUMBO_LEN 61 #define IP6OPT_JUMBO_LEN 6 62 #endif 63 #define IP6OPT_HOMEADDR_MINLEN 18 64 #define IP6OPT_BU_MINLEN 10 65 #define IP6OPT_BA_MINLEN 13 66 #define IP6OPT_BR_MINLEN 2 67 #define IP6SOPT_ALTCOA 0x4 68 #define IP6SOPT_ALTCOA_MINLEN 18 69 #define IP6SOPT_UI 0x2 70 #define IP6SOPT_UI_MINLEN 4 71 72 static void ip6_sopt_print(const u_char *, int); 73 74 static void 75 ip6_sopt_print(const u_char *bp, int len) 76 { 77 int i; 78 int optlen; 79 80 for (i = 0; i < len; i += optlen) { 81 switch (bp[i]) { 82 case IP6OPT_PAD1: 83 printf(", pad1"); 84 optlen = 1; 85 break; 86 case IP6OPT_PADN: 87 if (len - i < IP6OPT_MINLEN) { 88 printf(", padn: trunc"); 89 goto trunc; 90 } 91 printf(", padn"); 92 optlen = bp[i + 1] + 2; 93 break; 94 case IP6SOPT_ALTCOA: 95 if (len - i < IP6SOPT_ALTCOA_MINLEN) { 96 printf(", altcoa: trunc"); 97 goto trunc; 98 } 99 printf(", alt-CoA: %s", ip6addr_string(&bp[i+2])); 100 optlen = bp[i + 1] + 2; 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) ", ntohs(*(u_int16_t *)&bp[i + 2])); 108 optlen = bp[i + 1] + 2; 109 break; 110 default: 111 if (len - i < IP6OPT_MINLEN) { 112 printf(", sopt_type %d: trunc)", bp[i]); 113 goto trunc; 114 } 115 printf(", sopt_type 0x%02x: len=%d", bp[i], bp[i + 1]); 116 optlen = bp[i + 1] + 2; 117 break; 118 } 119 } 120 return; 121 122 trunc: 123 printf("[trunc] "); 124 } 125 126 void 127 ip6_opt_print(const u_char *bp, int len) 128 { 129 int i; 130 int optlen; 131 132 for (i = 0; i < len; i += optlen) { 133 switch (bp[i]) { 134 case IP6OPT_PAD1: 135 printf("(pad1)"); 136 optlen = 1; 137 break; 138 case IP6OPT_PADN: 139 if (len - i < IP6OPT_MINLEN) { 140 printf("(padn: trunc)"); 141 goto trunc; 142 } 143 printf("(padn)"); 144 optlen = bp[i + 1] + 2; 145 break; 146 case IP6OPT_ROUTER_ALERT: 147 if (len - i < IP6OPT_RTALERT_LEN) { 148 printf("(rtalert: trunc)"); 149 goto trunc; 150 } 151 if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) { 152 printf("(rtalert: invalid len %d)", bp[i + 1]); 153 goto trunc; 154 } 155 printf("(rtalert: 0x%04x) ", ntohs(*(u_int16_t *)&bp[i + 2])); 156 optlen = IP6OPT_RTALERT_LEN; 157 break; 158 case IP6OPT_JUMBO: 159 if (len - i < IP6OPT_JUMBO_LEN) { 160 printf("(jumbo: trunc)"); 161 goto trunc; 162 } 163 if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) { 164 printf("(jumbo: invalid len %d)", bp[i + 1]); 165 goto trunc; 166 } 167 printf("(jumbo: %u) ", (u_int32_t)ntohl(*(u_int32_t *)&bp[i + 2])); 168 optlen = IP6OPT_JUMBO_LEN; 169 break; 170 case IP6OPT_HOME_ADDRESS: 171 if (len - i < IP6OPT_HOMEADDR_MINLEN) { 172 printf("(homeaddr: trunc)"); 173 goto trunc; 174 } 175 if (bp[i + 1] < IP6OPT_HOMEADDR_MINLEN - 2) { 176 printf("(homeaddr: invalid len %d)", bp[i + 1]); 177 goto trunc; 178 } 179 printf("(homeaddr: %s", ip6addr_string(&bp[i + 2])); 180 if (bp[i + 1] > IP6OPT_HOMEADDR_MINLEN - 2) { 181 ip6_sopt_print(&bp[i + IP6OPT_HOMEADDR_MINLEN], 182 (optlen-IP6OPT_HOMEADDR_MINLEN)); 183 } 184 printf(")"); 185 optlen = bp[i + 1] + 2; 186 break; 187 case IP6OPT_BINDING_UPDATE: 188 if (len - i < IP6OPT_BU_MINLEN) { 189 printf("(bu: trunc)"); 190 goto trunc; 191 } 192 if (bp[i + 1] < IP6OPT_BU_MINLEN - 2) { 193 printf("(bu: invalid len %d)", bp[i + 1]); 194 goto trunc; 195 } 196 printf("(bu: "); 197 if (bp[i + 2] & 0x80) 198 printf("A"); 199 if (bp[i + 2] & 0x40) 200 printf("H"); 201 if (bp[i + 2] & 0x20) 202 printf("R"); 203 if (bp[i + 2] & 0x10) 204 printf("D"); 205 if (bp[i + 2] & 0x0f) 206 printf("res"); 207 printf(", prefixlen: %u", bp[i + 3]); 208 printf(", sequence: %u", 209 (u_int16_t)ntohs(*(u_int16_t *)&bp[i + 4])); 210 printf(", lifetime: %u", 211 (u_int32_t)ntohs(*(u_int32_t *)&bp[i + 8])); 212 213 optlen = bp[i + 1] + 2; 214 if (bp[i + 1] > IP6OPT_BU_MINLEN - 2) { 215 ip6_sopt_print(&bp[i + IP6OPT_BU_MINLEN], 216 (optlen - IP6OPT_BU_MINLEN)); 217 } 218 printf(")"); 219 break; 220 case IP6OPT_BINDING_ACK: 221 if (len - i < IP6OPT_BA_MINLEN) { 222 printf("(ba: trunc)"); 223 goto trunc; 224 } 225 if (bp[i + 1] < IP6OPT_BA_MINLEN - 2) { 226 printf("(ba: invalid len %d)", bp[i + 1]); 227 goto trunc; 228 } 229 printf("(ba: "); 230 printf("status: %u", bp[i + 2]); 231 printf(", sequence: %u", 232 (u_int16_t)ntohs(*(u_int16_t *)&bp[i + 3])); 233 printf(", lifetime: %u", 234 (u_int32_t)ntohs(*(u_int32_t *)&bp[i + 7])); 235 printf(", refresh: %u", 236 (u_int32_t)ntohs(*(u_int32_t *)&bp[i + 11])); 237 238 if (bp[i + 1] > IP6OPT_BA_MINLEN - 2) { 239 ip6_sopt_print(&bp[i + IP6OPT_BA_MINLEN], 240 (optlen-IP6OPT_BA_MINLEN)); 241 } 242 printf(")"); 243 optlen = bp[i + 1] + 2; 244 break; 245 case IP6OPT_BINDING_REQ: 246 if (len - i < IP6OPT_BR_MINLEN) { 247 printf("(br: trunc)"); 248 goto trunc; 249 } 250 printf("(br"); 251 if (bp[i + 1] > IP6OPT_BR_MINLEN - 2) { 252 ip6_sopt_print(&bp[i + IP6OPT_BR_MINLEN], 253 (optlen-IP6OPT_BR_MINLEN)); 254 } 255 printf(")"); 256 optlen = bp[i + 1] + 2; 257 break; 258 default: 259 if (len - i < IP6OPT_MINLEN) { 260 printf("(type %d: trunc)", bp[i]); 261 goto trunc; 262 } 263 printf("(opt_type 0x%02x: len=%d) ", bp[i], bp[i + 1]); 264 optlen = bp[i + 1] + 2; 265 break; 266 } 267 } 268 269 #if 0 270 end: 271 #endif 272 return; 273 274 trunc: 275 printf("[trunc] "); 276 } 277 278 int 279 hbhopt_print(register const u_char *bp) 280 { 281 const struct ip6_hbh *dp = (struct ip6_hbh *)bp; 282 register const u_char *ep; 283 int hbhlen = 0; 284 285 /* 'ep' points to the end of available data. */ 286 ep = snapend; 287 TCHECK(dp->ip6h_len); 288 hbhlen = (int)((dp->ip6h_len + 1) << 3); 289 TCHECK2(*dp, hbhlen); 290 printf("HBH "); 291 if (vflag) 292 ip6_opt_print((const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp)); 293 294 return(hbhlen); 295 296 trunc: 297 fputs("[|HBH]", stdout); 298 return(hbhlen); 299 } 300 301 int 302 dstopt_print(register const u_char *bp) 303 { 304 const struct ip6_dest *dp = (struct ip6_dest *)bp; 305 register const u_char *ep; 306 int dstoptlen = 0; 307 308 /* 'ep' points to the end of available data. */ 309 ep = snapend; 310 TCHECK(dp->ip6d_len); 311 dstoptlen = (int)((dp->ip6d_len + 1) << 3); 312 TCHECK2(*dp, dstoptlen); 313 printf("DSTOPT "); 314 if (vflag) { 315 ip6_opt_print((const u_char *)dp + sizeof(*dp), 316 dstoptlen - sizeof(*dp)); 317 } 318 319 return(dstoptlen); 320 321 trunc: 322 fputs("[|DSTOPT]", stdout); 323 return(dstoptlen); 324 } 325 #endif /* INET6 */ 326