1 /* 2 * Copyright (C) 2002 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 #include <sys/cdefs.h> 31 #ifndef lint 32 __RCSID("$NetBSD: print-mobility.c,v 1.10 2024/09/02 16:15:32 christos Exp $"); 33 #endif 34 35 /* \summary: IPv6 mobility printer */ 36 /* RFC 3775 */ 37 38 #include <config.h> 39 40 #include "netdissect-stdinc.h" 41 42 #include "netdissect.h" 43 #include "addrtoname.h" 44 #include "extract.h" 45 46 #include "ip6.h" 47 48 49 /* Mobility header */ 50 struct ip6_mobility { 51 nd_uint8_t ip6m_pproto; /* following payload protocol (for PG) */ 52 nd_uint8_t ip6m_len; /* length in units of 8 octets */ 53 nd_uint8_t ip6m_type; /* message type */ 54 nd_uint8_t reserved; /* reserved */ 55 nd_uint16_t ip6m_cksum; /* sum of IPv6 pseudo-header and MH */ 56 union { 57 nd_uint16_t ip6m_un_data16[1]; /* type-specific field */ 58 nd_uint8_t ip6m_un_data8[2]; /* type-specific field */ 59 } ip6m_dataun; 60 }; 61 62 #define ip6m_data16 ip6m_dataun.ip6m_un_data16 63 #define ip6m_data8 ip6m_dataun.ip6m_un_data8 64 65 #define IP6M_MINLEN 8 66 67 /* https://www.iana.org/assignments/mobility-parameters/mobility-parameters.xhtml */ 68 69 /* message type */ 70 #define IP6M_BINDING_REQUEST 0 /* Binding Refresh Request */ 71 #define IP6M_HOME_TEST_INIT 1 /* Home Test Init */ 72 #define IP6M_CAREOF_TEST_INIT 2 /* Care-of Test Init */ 73 #define IP6M_HOME_TEST 3 /* Home Test */ 74 #define IP6M_CAREOF_TEST 4 /* Care-of Test */ 75 #define IP6M_BINDING_UPDATE 5 /* Binding Update */ 76 #define IP6M_BINDING_ACK 6 /* Binding Acknowledgement */ 77 #define IP6M_BINDING_ERROR 7 /* Binding Error */ 78 #define IP6M_MAX 7 79 80 static const struct tok ip6m_str[] = { 81 { IP6M_BINDING_REQUEST, "BRR" }, 82 { IP6M_HOME_TEST_INIT, "HoTI" }, 83 { IP6M_CAREOF_TEST_INIT, "CoTI" }, 84 { IP6M_HOME_TEST, "HoT" }, 85 { IP6M_CAREOF_TEST, "CoT" }, 86 { IP6M_BINDING_UPDATE, "BU" }, 87 { IP6M_BINDING_ACK, "BA" }, 88 { IP6M_BINDING_ERROR, "BE" }, 89 { 0, NULL } 90 }; 91 92 static const unsigned ip6m_hdrlen[IP6M_MAX + 1] = { 93 IP6M_MINLEN, /* IP6M_BINDING_REQUEST */ 94 IP6M_MINLEN + 8, /* IP6M_HOME_TEST_INIT */ 95 IP6M_MINLEN + 8, /* IP6M_CAREOF_TEST_INIT */ 96 IP6M_MINLEN + 16, /* IP6M_HOME_TEST */ 97 IP6M_MINLEN + 16, /* IP6M_CAREOF_TEST */ 98 IP6M_MINLEN + 4, /* IP6M_BINDING_UPDATE */ 99 IP6M_MINLEN + 4, /* IP6M_BINDING_ACK */ 100 IP6M_MINLEN + 16, /* IP6M_BINDING_ERROR */ 101 }; 102 103 /* Mobility Header Options */ 104 #define IP6MOPT_MINLEN 2 105 #define IP6MOPT_PAD1 0x0 /* Pad1 */ 106 #define IP6MOPT_PADN 0x1 /* PadN */ 107 #define IP6MOPT_REFRESH 0x2 /* Binding Refresh Advice */ 108 #define IP6MOPT_REFRESH_MINLEN 4 109 #define IP6MOPT_ALTCOA 0x3 /* Alternate Care-of Address */ 110 #define IP6MOPT_ALTCOA_MINLEN 18 111 #define IP6MOPT_NONCEID 0x4 /* Nonce Indices */ 112 #define IP6MOPT_NONCEID_MINLEN 6 113 #define IP6MOPT_AUTH 0x5 /* Binding Authorization Data */ 114 #define IP6MOPT_AUTH_MINLEN 12 115 116 static const struct tok ip6m_binding_update_bits [] = { 117 { 0x08, "A" }, 118 { 0x04, "H" }, 119 { 0x02, "L" }, 120 { 0x01, "K" }, 121 { 0, NULL } 122 }; 123 124 static int 125 mobility_opt_print(netdissect_options *ndo, 126 const u_char *bp, const unsigned len) 127 { 128 unsigned i, optlen; 129 130 for (i = 0; i < len; i += optlen) { 131 if (GET_U_1(bp + i) == IP6MOPT_PAD1) 132 optlen = 1; 133 else { 134 if (i + 1 < len) { 135 optlen = GET_U_1(bp + i + 1) + 2; 136 } else 137 goto trunc; 138 } 139 if (i + optlen > len) 140 goto trunc; 141 ND_TCHECK_1(bp + i + optlen); 142 143 switch (GET_U_1(bp + i)) { 144 case IP6MOPT_PAD1: 145 ND_PRINT("(pad1)"); 146 break; 147 case IP6MOPT_PADN: 148 if (len - i < IP6MOPT_MINLEN) { 149 ND_PRINT("(padn: trunc)"); 150 goto trunc; 151 } 152 ND_PRINT("(padn)"); 153 break; 154 case IP6MOPT_REFRESH: 155 if (len - i < IP6MOPT_REFRESH_MINLEN) { 156 ND_PRINT("(refresh: trunc)"); 157 goto trunc; 158 } 159 /* units of 4 secs */ 160 ND_PRINT("(refresh: %u)", 161 GET_BE_U_2(bp + i + 2) << 2); 162 break; 163 case IP6MOPT_ALTCOA: 164 if (len - i < IP6MOPT_ALTCOA_MINLEN) { 165 ND_PRINT("(altcoa: trunc)"); 166 goto trunc; 167 } 168 ND_PRINT("(alt-CoA: %s)", GET_IP6ADDR_STRING(bp + i + 2)); 169 break; 170 case IP6MOPT_NONCEID: 171 if (len - i < IP6MOPT_NONCEID_MINLEN) { 172 ND_PRINT("(ni: trunc)"); 173 goto trunc; 174 } 175 ND_PRINT("(ni: ho=0x%04x co=0x%04x)", 176 GET_BE_U_2(bp + i + 2), 177 GET_BE_U_2(bp + i + 4)); 178 break; 179 case IP6MOPT_AUTH: 180 if (len - i < IP6MOPT_AUTH_MINLEN) { 181 ND_PRINT("(auth: trunc)"); 182 goto trunc; 183 } 184 ND_PRINT("(auth)"); 185 break; 186 default: 187 if (len - i < IP6MOPT_MINLEN) { 188 ND_PRINT("(sopt_type %u: trunc)", 189 GET_U_1(bp + i)); 190 goto trunc; 191 } 192 ND_PRINT("(type-0x%02x: len=%u)", GET_U_1(bp + i), 193 GET_U_1(bp + i + 1)); 194 break; 195 } 196 } 197 return 0; 198 199 trunc: 200 return 1; 201 } 202 203 /* 204 * Mobility Header 205 */ 206 int 207 mobility_print(netdissect_options *ndo, 208 const u_char *bp, const u_char *bp2 _U_) 209 { 210 const struct ip6_mobility *mh; 211 const u_char *ep; 212 unsigned mhlen, hlen; 213 uint8_t type; 214 215 ndo->ndo_protocol = "mobility"; 216 mh = (const struct ip6_mobility *)bp; 217 218 /* 'ep' points to the end of available data. */ 219 ep = ndo->ndo_snapend; 220 221 if (!ND_TTEST_1(mh->ip6m_len)) { 222 /* 223 * There's not enough captured data to include the 224 * mobility header length. 225 * 226 * Our caller expects us to return the length, however, 227 * so return a value that will run to the end of the 228 * captured data. 229 * 230 * XXX - "ip6_print()" doesn't do anything with the 231 * returned length, however, as it breaks out of the 232 * header-processing loop. 233 */ 234 mhlen = (unsigned)(ep - bp); 235 goto trunc; 236 } 237 mhlen = (GET_U_1(mh->ip6m_len) + 1) << 3; 238 239 /* XXX ip6m_cksum */ 240 241 type = GET_U_1(mh->ip6m_type); 242 if (type <= IP6M_MAX && mhlen < ip6m_hdrlen[type]) { 243 ND_PRINT("(header length %u is too small for type %u)", mhlen, type); 244 goto trunc; 245 } 246 ND_PRINT("mobility: %s", tok2str(ip6m_str, "type-#%u", type)); 247 switch (type) { 248 case IP6M_BINDING_REQUEST: 249 hlen = IP6M_MINLEN; 250 break; 251 case IP6M_HOME_TEST_INIT: 252 case IP6M_CAREOF_TEST_INIT: 253 hlen = IP6M_MINLEN; 254 if (ndo->ndo_vflag) { 255 ND_PRINT(" %s Init Cookie=%08x:%08x", 256 type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of", 257 GET_BE_U_4(bp + hlen), 258 GET_BE_U_4(bp + hlen + 4)); 259 } 260 hlen += 8; 261 break; 262 case IP6M_HOME_TEST: 263 case IP6M_CAREOF_TEST: 264 ND_PRINT(" nonce id=0x%x", GET_BE_U_2(mh->ip6m_data16[0])); 265 hlen = IP6M_MINLEN; 266 if (ndo->ndo_vflag) { 267 ND_PRINT(" %s Init Cookie=%08x:%08x", 268 type == IP6M_HOME_TEST ? "Home" : "Care-of", 269 GET_BE_U_4(bp + hlen), 270 GET_BE_U_4(bp + hlen + 4)); 271 } 272 hlen += 8; 273 if (ndo->ndo_vflag) { 274 ND_PRINT(" %s Keygen Token=%08x:%08x", 275 type == IP6M_HOME_TEST ? "Home" : "Care-of", 276 GET_BE_U_4(bp + hlen), 277 GET_BE_U_4(bp + hlen + 4)); 278 } 279 hlen += 8; 280 break; 281 case IP6M_BINDING_UPDATE: 282 { 283 int bits; 284 ND_PRINT(" seq#=%u", GET_BE_U_2(mh->ip6m_data16[0])); 285 hlen = IP6M_MINLEN; 286 ND_TCHECK_2(bp + hlen); 287 bits = (GET_U_1(bp + hlen) & 0xf0) >> 4; 288 if (bits) { 289 ND_PRINT(" "); 290 ND_PRINT("%s", 291 bittok2str_nosep(ip6m_binding_update_bits, 292 "bits-#0x%x", bits)); 293 } 294 /* Reserved (4bits) */ 295 hlen += 1; 296 /* Reserved (8bits) */ 297 hlen += 1; 298 /* units of 4 secs */ 299 ND_PRINT(" lifetime=%u", GET_BE_U_2(bp + hlen) << 2); 300 hlen += 2; 301 break; 302 } 303 case IP6M_BINDING_ACK: 304 ND_PRINT(" status=%u", GET_U_1(mh->ip6m_data8[0])); 305 if (GET_U_1(mh->ip6m_data8[1]) & 0x80) 306 ND_PRINT(" K"); 307 /* Reserved (7bits) */ 308 hlen = IP6M_MINLEN; 309 ND_PRINT(" seq#=%u", GET_BE_U_2(bp + hlen)); 310 hlen += 2; 311 /* units of 4 secs */ 312 ND_PRINT(" lifetime=%u", GET_BE_U_2(bp + hlen) << 2); 313 hlen += 2; 314 break; 315 case IP6M_BINDING_ERROR: 316 ND_PRINT(" status=%u", GET_U_1(mh->ip6m_data8[0])); 317 /* Reserved */ 318 hlen = IP6M_MINLEN; 319 ND_PRINT(" homeaddr %s", GET_IP6ADDR_STRING(bp + hlen)); 320 hlen += 16; 321 break; 322 default: 323 ND_PRINT(" len=%u", GET_U_1(mh->ip6m_len)); 324 return(mhlen); 325 break; 326 } 327 if (ndo->ndo_vflag) 328 if (mobility_opt_print(ndo, bp + hlen, mhlen - hlen)) 329 goto trunc; 330 331 return(mhlen); 332 333 trunc: 334 nd_print_trunc(ndo); 335 return(-1); 336 } 337
Indexes created Tue Feb 24 08:35:24 UTC 2026