1 /* 2 * Copyright (c) 1998-2007 The TCPDUMP project 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that: (1) source code 6 * distributions retain the above copyright notice and this paragraph 7 * in its entirety, and (2) distributions including binary code include 8 * the above copyright notice and this paragraph in its entirety in 9 * the documentation or other materials provided with the distribution. 10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND 11 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT 12 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 13 * FOR A PARTICULAR PURPOSE. 14 * 15 * Optimized Link State Protocl (OLSR) as per rfc3626 16 * 17 * Original code by Hannes Gredler <hannes@juniper.net> 18 */ 19 20 #ifdef HAVE_CONFIG_H 21 #include "config.h" 22 #endif 23 24 #include <tcpdump-stdinc.h> 25 26 #include <stdio.h> 27 #include <string.h> 28 29 #include "interface.h" 30 #include "addrtoname.h" 31 #include "extract.h" 32 #include "ip.h" 33 34 /* 35 * RFC 3626 common header 36 * 37 * 0 1 2 3 38 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 39 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 40 * | Packet Length | Packet Sequence Number | 41 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 42 * | Message Type | Vtime | Message Size | 43 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 44 * | Originator Address | 45 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 46 * | Time To Live | Hop Count | Message Sequence Number | 47 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 48 * | | 49 * : MESSAGE : 50 * | | 51 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 52 * | Message Type | Vtime | Message Size | 53 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 54 * | Originator Address | 55 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 56 * | Time To Live | Hop Count | Message Sequence Number | 57 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 58 * | | 59 * : MESSAGE : 60 * | | 61 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 62 * : : 63 */ 64 65 struct olsr_common { 66 u_int8_t packet_len[2]; 67 u_int8_t packet_seq[2]; 68 }; 69 70 #define OLSR_HELLO_MSG 1 /* rfc3626 */ 71 #define OLSR_TC_MSG 2 /* rfc3626 */ 72 #define OLSR_MID_MSG 3 /* rfc3626 */ 73 #define OLSR_HNA_MSG 4 /* rfc3626 */ 74 #define OLSR_POWERINFO_MSG 128 75 #define OLSR_NAMESERVICE_MSG 130 76 #define OLSR_HELLO_LQ_MSG 201 /* LQ extensions olsr.org */ 77 #define OLSR_TC_LQ_MSG 202 /* LQ extensions olsr.org */ 78 79 static struct tok olsr_msg_values[] = { 80 { OLSR_HELLO_MSG, "Hello" }, 81 { OLSR_TC_MSG, "TC" }, 82 { OLSR_MID_MSG, "MID" }, 83 { OLSR_HNA_MSG, "HNA" }, 84 { OLSR_POWERINFO_MSG, "Powerinfo" }, 85 { OLSR_NAMESERVICE_MSG, "Nameservice" }, 86 { OLSR_HELLO_LQ_MSG, "Hello-LQ" }, 87 { OLSR_TC_LQ_MSG, "TC-LQ" }, 88 { 0, NULL} 89 }; 90 91 struct olsr_msg { 92 u_int8_t msg_type; 93 u_int8_t vtime; 94 u_int8_t msg_len[2]; 95 u_int8_t originator[4]; 96 u_int8_t ttl; 97 u_int8_t hopcount; 98 u_int8_t msg_seq[2]; 99 }; 100 101 struct olsr_hello { 102 u_int8_t res[2]; 103 u_int8_t htime; 104 u_int8_t will; 105 }; 106 107 struct olsr_hello_link { 108 u_int8_t link_code; 109 u_int8_t res; 110 u_int8_t len[2]; 111 }; 112 113 struct olsr_tc { 114 u_int8_t ans_seq[2]; 115 u_int8_t res[2]; 116 }; 117 118 struct olsr_hna { 119 u_int8_t network[4]; 120 u_int8_t mask[4]; 121 }; 122 123 124 #define OLSR_EXTRACT_LINK_TYPE(link_code) (link_code & 0x3) 125 #define OLSR_EXTRACT_NEIGHBOR_TYPE(link_code) (link_code >> 2) 126 127 static struct tok olsr_link_type_values[] = { 128 { 0, "Unspecified" }, 129 { 1, "Asymmetric" }, 130 { 2, "Symmetric" }, 131 { 3, "Lost" }, 132 { 0, NULL} 133 }; 134 135 static struct tok olsr_neighbor_type_values[] = { 136 { 0, "Not-Neighbor" }, 137 { 1, "Symmetric" }, 138 { 2, "Symmetric-MPR" }, 139 { 0, NULL} 140 }; 141 142 struct olsr_lq_neighbor { 143 u_int8_t neighbor[4]; 144 u_int8_t link_quality; 145 u_int8_t neighbor_link_quality; 146 u_int8_t res[2]; 147 }; 148 149 /* 150 * macro to convert the 8-bit mantissa/exponent to a double float 151 * taken from olsr.org. 152 */ 153 #define VTIME_SCALE_FACTOR 0.0625 154 #define ME_TO_DOUBLE(me) \ 155 (double)(VTIME_SCALE_FACTOR*(1+(double)(me>>4)/16)*(double)(1<<(me&0x0F))) 156 157 /* 158 * print a neighbor list with LQ extensions. 159 */ 160 static void 161 olsr_print_lq_neighbor (const u_char *msg_data, u_int hello_len) 162 { 163 struct olsr_lq_neighbor *lq_neighbor; 164 165 while (hello_len >= sizeof(struct olsr_lq_neighbor)) { 166 167 lq_neighbor = (struct olsr_lq_neighbor *)msg_data; 168 169 printf("\n\t neighbor %s, link-quality %.2lf%%" 170 ", neighbor-link-quality %.2lf%%", 171 ipaddr_string(lq_neighbor->neighbor), 172 ((double)lq_neighbor->link_quality/2.55), 173 ((double)lq_neighbor->neighbor_link_quality/2.55)); 174 175 msg_data += sizeof(struct olsr_lq_neighbor); 176 hello_len -= sizeof(struct olsr_lq_neighbor); 177 } 178 } 179 180 /* 181 * print a neighbor list. 182 */ 183 static void 184 olsr_print_neighbor (const u_char *msg_data, u_int hello_len) 185 { 186 int neighbor; 187 188 printf("\n\t neighbor\n\t\t"); 189 neighbor = 1; 190 191 while (hello_len >= sizeof(struct in_addr)) { 192 193 /* print 4 neighbors per line */ 194 195 printf("%s%s", ipaddr_string(msg_data), 196 neighbor % 4 == 0 ? "\n\t\t" : " "); 197 198 msg_data += sizeof(struct in_addr); 199 hello_len -= sizeof(struct in_addr); 200 } 201 } 202 203 204 void 205 olsr_print (const u_char *pptr, u_int length) 206 { 207 union { 208 const struct olsr_common *common; 209 const struct olsr_msg *msg; 210 const struct olsr_hello *hello; 211 const struct olsr_hello_link *hello_link; 212 const struct olsr_lq_neighbor *lq_neighbor; 213 const struct olsr_tc *tc; 214 const struct olsr_hna *hna; 215 } ptr; 216 217 u_int msg_type, msg_len, msg_tlen, hello_len, prefix; 218 u_int8_t link_type, neighbor_type; 219 const u_char *tptr, *msg_data; 220 221 tptr = pptr; 222 223 if (length < sizeof(struct olsr_common)) { 224 goto trunc; 225 } 226 227 if (!TTEST2(*tptr, sizeof(struct olsr_common))) { 228 goto trunc; 229 } 230 231 ptr.common = (struct olsr_common *)tptr; 232 length = MIN(length, EXTRACT_16BITS(ptr.common->packet_len)); 233 234 printf("OLSR, seq 0x%04x, length %u", 235 EXTRACT_16BITS(ptr.common->packet_seq), 236 length); 237 238 tptr += sizeof(struct olsr_common); 239 240 /* 241 * In non-verbose mode, just print version. 242 */ 243 if (vflag < 1) { 244 return; 245 } 246 247 while (tptr < (pptr+length)) { 248 249 if (!TTEST2(*tptr, sizeof(struct olsr_msg))) 250 goto trunc; 251 252 ptr.msg = (struct olsr_msg *)tptr; 253 254 msg_type = ptr.msg->msg_type; 255 msg_len = EXTRACT_16BITS(ptr.msg->msg_len); 256 257 /* infinite loop check */ 258 if (msg_type == 0 || msg_len == 0) { 259 return; 260 } 261 262 printf("\n\t%s Message (%u), originator %s, ttl %u, hop %u" 263 "\n\t vtime %.3lfs, msg-seq 0x%04x, length %u", 264 tok2str(olsr_msg_values, "Unknown", msg_type), 265 msg_type, ipaddr_string(ptr.msg->originator), 266 ptr.msg->ttl, 267 ptr.msg->hopcount, 268 ME_TO_DOUBLE(ptr.msg->vtime), 269 EXTRACT_16BITS(ptr.msg->msg_seq), 270 msg_len); 271 272 msg_tlen = msg_len - sizeof(struct olsr_msg); 273 msg_data = tptr + sizeof(struct olsr_msg); 274 275 switch (msg_type) { 276 case OLSR_HELLO_MSG: 277 case OLSR_HELLO_LQ_MSG: 278 if (!TTEST2(*msg_data, sizeof(struct olsr_hello))) 279 goto trunc; 280 281 ptr.hello = (struct olsr_hello *)msg_data; 282 printf("\n\t hello-time %.3lfs, MPR willingness %u", 283 ME_TO_DOUBLE(ptr.hello->htime), ptr.hello->will); 284 msg_data += sizeof(struct olsr_hello); 285 msg_tlen -= sizeof(struct olsr_hello); 286 287 while (msg_tlen >= sizeof(struct olsr_hello_link)) { 288 289 /* 290 * link-type. 291 */ 292 if (!TTEST2(*msg_data, sizeof(struct olsr_hello_link))) 293 goto trunc; 294 295 ptr.hello_link = (struct olsr_hello_link *)msg_data; 296 297 hello_len = EXTRACT_16BITS(ptr.hello_link->len); 298 link_type = OLSR_EXTRACT_LINK_TYPE(ptr.hello_link->link_code); 299 neighbor_type = OLSR_EXTRACT_NEIGHBOR_TYPE(ptr.hello_link->link_code); 300 301 printf("\n\t link-type %s, neighbor-type %s, len %u", 302 tok2str(olsr_link_type_values, "Unknown", link_type), 303 tok2str(olsr_neighbor_type_values, "Unknown", neighbor_type), 304 hello_len); 305 306 msg_data += sizeof(struct olsr_hello_link); 307 msg_tlen -= sizeof(struct olsr_hello_link); 308 hello_len -= sizeof(struct olsr_hello_link); 309 310 if (msg_type == OLSR_HELLO_MSG) { 311 olsr_print_neighbor(msg_data, hello_len); 312 } else { 313 olsr_print_lq_neighbor(msg_data, hello_len); 314 } 315 316 msg_data += hello_len; 317 msg_tlen -= hello_len; 318 } 319 break; 320 321 case OLSR_TC_MSG: 322 case OLSR_TC_LQ_MSG: 323 if (!TTEST2(*msg_data, sizeof(struct olsr_tc))) 324 goto trunc; 325 326 ptr.tc = (struct olsr_tc *)msg_data; 327 printf("\n\t advertised neighbor seq 0x%04x", 328 EXTRACT_16BITS(ptr.tc->ans_seq)); 329 msg_data += sizeof(struct olsr_tc); 330 msg_tlen -= sizeof(struct olsr_tc); 331 332 if (msg_type == OLSR_TC_MSG) { 333 olsr_print_neighbor(msg_data, msg_tlen); 334 } else { 335 olsr_print_lq_neighbor(msg_data, msg_tlen); 336 } 337 break; 338 339 case OLSR_MID_MSG: 340 if (!TTEST2(*msg_data, sizeof(struct in_addr))) 341 goto trunc; 342 343 while (msg_tlen >= sizeof(struct in_addr)) { 344 printf("\n\t interface address %s", ipaddr_string(msg_data)); 345 msg_data += sizeof(struct in_addr); 346 msg_tlen -= sizeof(struct in_addr); 347 } 348 break; 349 350 case OLSR_HNA_MSG: 351 prefix = 1; 352 printf("\n\t advertised networks\n\t "); 353 while (msg_tlen >= sizeof(struct olsr_hna)) { 354 if (!TTEST2(*msg_data, sizeof(struct olsr_hna))) 355 goto trunc; 356 357 ptr.hna = (struct olsr_hna *)msg_data; 358 359 /* print 4 prefixes per line */ 360 361 printf("%s/%u%s", 362 ipaddr_string(ptr.hna->network), 363 mask2plen(EXTRACT_32BITS(ptr.hna->mask)), 364 prefix % 4 == 0 ? "\n\t " : " "); 365 366 msg_data += sizeof(struct olsr_hna); 367 msg_tlen -= sizeof(struct olsr_hna); 368 prefix ++; 369 } 370 break; 371 372 /* 373 * FIXME those are the defined messages that lack a decoder 374 * you are welcome to contribute code ;-) 375 */ 376 377 case OLSR_POWERINFO_MSG: 378 case OLSR_NAMESERVICE_MSG: 379 default: 380 print_unknown_data(msg_data, "\n\t ", msg_tlen); 381 break; 382 } 383 tptr += msg_len; 384 } 385 386 return; 387 388 trunc: 389 printf("[|olsr]"); 390 } 391 392 /* 393 * Local Variables: 394 * c-style: whitesmith 395 * c-basic-offset: 4 396 * End: 397 */ 398