| 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 */ |