1 /* 2 * Copyright (c) 1998-2011 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 * support for the The RPKI/Router Protocol as RFC6810 16 * 17 * Original code by Hannes Gredler (hannes@juniper.net) 18 */ 19 20 #define NETDISSECT_REWORKED 21 #ifdef HAVE_CONFIG_H 22 #include "config.h" 23 #endif 24 25 #include <tcpdump-stdinc.h> 26 27 #include <string.h> 28 29 #include "interface.h" 30 #include "extract.h" 31 #include "addrtoname.h" 32 33 /* 34 * RPKI/Router PDU header 35 * 36 * Here's what the PDU header looks like. 37 * The length does include the version and length fields. 38 */ 39 typedef struct rpki_rtr_pdu_ { 40 u_char version; /* Version number */ 41 u_char pdu_type; /* PDU type */ 42 union { 43 u_char session_id[2]; /* Session id */ 44 u_char error_code[2]; /* Error code */ 45 } u; 46 u_char length[4]; 47 } rpki_rtr_pdu; 48 #define RPKI_RTR_PDU_OVERHEAD (offsetof(rpki_rtr_pdu, rpki_rtr_pdu_msg)) 49 50 /* 51 * IPv4 Prefix PDU. 52 */ 53 typedef struct rpki_rtr_pdu_ipv4_prefix_ { 54 rpki_rtr_pdu pdu_header; 55 u_char flags; 56 u_char prefix_length; 57 u_char max_length; 58 u_char zero; 59 u_char prefix[4]; 60 u_char as[4]; 61 } rpki_rtr_pdu_ipv4_prefix; 62 63 /* 64 * IPv6 Prefix PDU. 65 */ 66 typedef struct rpki_rtr_pdu_ipv6_prefix_ { 67 rpki_rtr_pdu pdu_header; 68 u_char flags; 69 u_char prefix_length; 70 u_char max_length; 71 u_char zero; 72 u_char prefix[16]; 73 u_char as[4]; 74 } rpki_rtr_pdu_ipv6_prefix; 75 76 /* 77 * Error report PDU. 78 */ 79 typedef struct rpki_rtr_pdu_error_report_ { 80 rpki_rtr_pdu pdu_header; 81 u_char encapsulated_pdu_length[4]; /* Encapsulated PDU length */ 82 } rpki_rtr_pdu_error_report; 83 84 /* 85 * PDU type codes 86 */ 87 #define RPKI_RTR_SERIAL_NOTIFY_PDU 0 88 #define RPKI_RTR_SERIAL_QUERY_PDU 1 89 #define RPKI_RTR_RESET_QUERY_PDU 2 90 #define RPKI_RTR_CACHE_RESPONSE_PDU 3 91 #define RPKI_RTR_IPV4_PREFIX_PDU 4 92 #define RPKI_RTR_IPV6_PREFIX_PDU 6 93 #define RPKI_RTR_END_OF_DATA_PDU 7 94 #define RPKI_RTR_CACHE_RESET_PDU 8 95 #define RPKI_RTR_ERROR_REPORT_PDU 10 96 97 static const struct tok rpki_rtr_pdu_values[] = { 98 { RPKI_RTR_SERIAL_NOTIFY_PDU, "Serial Notify" }, 99 { RPKI_RTR_SERIAL_QUERY_PDU, "Serial Query" }, 100 { RPKI_RTR_RESET_QUERY_PDU, "Reset Query" }, 101 { RPKI_RTR_CACHE_RESPONSE_PDU, "Cache Response" }, 102 { RPKI_RTR_IPV4_PREFIX_PDU, "IPV4 Prefix" }, 103 { RPKI_RTR_IPV6_PREFIX_PDU, "IPV6 Prefix" }, 104 { RPKI_RTR_END_OF_DATA_PDU, "End of Data" }, 105 { RPKI_RTR_CACHE_RESET_PDU, "Cache Reset" }, 106 { RPKI_RTR_ERROR_REPORT_PDU, "Error Report" }, 107 { 0, NULL} 108 }; 109 110 static const struct tok rpki_rtr_error_codes[] = { 111 { 0, "Corrupt Data" }, 112 { 1, "Internal Error" }, 113 { 2, "No Data Available" }, 114 { 3, "Invalid Request" }, 115 { 4, "Unsupported Protocol Version" }, 116 { 5, "Unsupported PDU Type" }, 117 { 6, "Withdrawal of Unknown Record" }, 118 { 7, "Duplicate Announcement Received" }, 119 { 0, NULL} 120 }; 121 122 /* 123 * Build a identation string for a given identation level. 124 * XXX this should be really in util.c 125 */ 126 static char * 127 indent_string (u_int indent) 128 { 129 static char buf[20]; 130 u_int idx; 131 132 idx = 0; 133 buf[idx] = '\0'; 134 135 /* 136 * Does the static buffer fit ? 137 */ 138 if (sizeof(buf) < ((indent/8) + (indent %8) + 2)) { 139 return buf; 140 } 141 142 /* 143 * Heading newline. 144 */ 145 buf[idx] = '\n'; 146 idx++; 147 148 while (indent >= 8) { 149 buf[idx] = '\t'; 150 idx++; 151 indent -= 8; 152 } 153 154 while (indent > 0) { 155 buf[idx] = ' '; 156 idx++; 157 indent--; 158 } 159 160 /* 161 * Trailing zero. 162 */ 163 buf[idx] = '\0'; 164 165 return buf; 166 } 167 168 /* 169 * Print a single PDU. 170 */ 171 static void 172 rpki_rtr_pdu_print (netdissect_options *ndo, const u_char *tptr, u_int indent) 173 { 174 const rpki_rtr_pdu *pdu_header; 175 u_int pdu_type, pdu_len, hexdump; 176 const u_char *msg; 177 178 pdu_header = (rpki_rtr_pdu *)tptr; 179 pdu_type = pdu_header->pdu_type; 180 pdu_len = EXTRACT_32BITS(pdu_header->length); 181 hexdump = FALSE; 182 183 ND_PRINT((ndo, "%sRPKI-RTRv%u, %s PDU (%u), length: %u", 184 indent_string(8), 185 pdu_header->version, 186 tok2str(rpki_rtr_pdu_values, "Unknown", pdu_type), 187 pdu_type, pdu_len)); 188 189 switch (pdu_type) { 190 191 /* 192 * The following PDUs share the message format. 193 */ 194 case RPKI_RTR_SERIAL_NOTIFY_PDU: 195 case RPKI_RTR_SERIAL_QUERY_PDU: 196 case RPKI_RTR_END_OF_DATA_PDU: 197 msg = (const u_char *)(pdu_header + 1); 198 ND_PRINT((ndo, "%sSession ID: 0x%04x, Serial: %u", 199 indent_string(indent+2), 200 EXTRACT_16BITS(pdu_header->u.session_id), 201 EXTRACT_32BITS(msg))); 202 break; 203 204 /* 205 * The following PDUs share the message format. 206 */ 207 case RPKI_RTR_RESET_QUERY_PDU: 208 case RPKI_RTR_CACHE_RESET_PDU: 209 210 /* 211 * Zero payload PDUs. 212 */ 213 break; 214 215 case RPKI_RTR_CACHE_RESPONSE_PDU: 216 ND_PRINT((ndo, "%sSession ID: 0x%04x", 217 indent_string(indent+2), 218 EXTRACT_16BITS(pdu_header->u.session_id))); 219 break; 220 221 case RPKI_RTR_IPV4_PREFIX_PDU: 222 { 223 rpki_rtr_pdu_ipv4_prefix *pdu; 224 225 pdu = (rpki_rtr_pdu_ipv4_prefix *)tptr; 226 ND_PRINT((ndo, "%sIPv4 Prefix %s/%u-%u, origin-as %u, flags 0x%02x", 227 indent_string(indent+2), 228 ipaddr_string(ndo, pdu->prefix), 229 pdu->prefix_length, pdu->max_length, 230 EXTRACT_32BITS(pdu->as), pdu->flags)); 231 } 232 break; 233 234 #ifdef INET6 235 case RPKI_RTR_IPV6_PREFIX_PDU: 236 { 237 rpki_rtr_pdu_ipv6_prefix *pdu; 238 239 pdu = (rpki_rtr_pdu_ipv6_prefix *)tptr; 240 ND_PRINT((ndo, "%sIPv6 Prefix %s/%u-%u, origin-as %u, flags 0x%02x", 241 indent_string(indent+2), 242 ip6addr_string(ndo, pdu->prefix), 243 pdu->prefix_length, pdu->max_length, 244 EXTRACT_32BITS(pdu->as), pdu->flags)); 245 } 246 break; 247 #endif 248 249 case RPKI_RTR_ERROR_REPORT_PDU: 250 { 251 rpki_rtr_pdu_error_report *pdu; 252 u_int encapsulated_pdu_length, text_length, tlen, error_code; 253 u_char buf[80]; 254 255 pdu = (rpki_rtr_pdu_error_report *)tptr; 256 encapsulated_pdu_length = EXTRACT_32BITS(pdu->encapsulated_pdu_length); 257 tlen = pdu_len; 258 259 error_code = EXTRACT_16BITS(pdu->pdu_header.u.error_code); 260 ND_PRINT((ndo, "%sError code: %s (%u), Encapsulated PDU length: %u", 261 indent_string(indent+2), 262 tok2str(rpki_rtr_error_codes, "Unknown", error_code), 263 error_code, encapsulated_pdu_length)); 264 265 tptr += sizeof(*pdu); 266 tlen -= sizeof(*pdu); 267 268 /* 269 * Recurse if there is an encapsulated PDU. 270 */ 271 if (encapsulated_pdu_length && 272 (encapsulated_pdu_length <= tlen)) { 273 ND_PRINT((ndo, "%s-----encapsulated PDU-----", indent_string(indent+4))); 274 rpki_rtr_pdu_print(ndo, tptr, indent+2); 275 } 276 277 tptr += encapsulated_pdu_length; 278 tlen -= encapsulated_pdu_length; 279 280 /* 281 * Extract, trail-zero and print the Error message. 282 */ 283 text_length = 0; 284 if (tlen > 4) { 285 text_length = EXTRACT_32BITS(tptr); 286 tptr += 4; 287 tlen -= 4; 288 } 289 if (text_length && (text_length <= tlen )) { 290 memcpy(buf, tptr, min(sizeof(buf)-1, text_length)); 291 buf[text_length] = '\0'; 292 ND_PRINT((ndo, "%sError text: %s", indent_string(indent+2), buf)); 293 } 294 } 295 break; 296 297 default: 298 299 /* 300 * Unknown data, please hexdump. 301 */ 302 hexdump = TRUE; 303 } 304 305 /* do we also want to see a hex dump ? */ 306 if (ndo->ndo_vflag > 1 || (ndo->ndo_vflag && hexdump)) { 307 print_unknown_data(ndo,tptr,"\n\t ", pdu_len); 308 } 309 } 310 311 void 312 rpki_rtr_print(netdissect_options *ndo, register const u_char *pptr, register u_int len) { 313 314 u_int tlen, pdu_type, pdu_len; 315 const u_char *tptr; 316 const rpki_rtr_pdu *pdu_header; 317 318 tptr = pptr; 319 tlen = len; 320 321 if (!ndo->ndo_vflag) { 322 ND_PRINT((ndo, ", RPKI-RTR")); 323 return; 324 } 325 326 while (tlen >= sizeof(rpki_rtr_pdu)) { 327 328 ND_TCHECK2(*tptr, sizeof(rpki_rtr_pdu)); 329 330 pdu_header = (rpki_rtr_pdu *)tptr; 331 pdu_type = pdu_header->pdu_type; 332 pdu_len = EXTRACT_32BITS(pdu_header->length); 333 334 /* infinite loop check */ 335 if (!pdu_type || !pdu_len) { 336 break; 337 } 338 339 ND_TCHECK2(*tptr, pdu_len); 340 if (tlen < pdu_len) { 341 goto trunc; 342 } 343 344 /* 345 * Print the PDU. 346 */ 347 rpki_rtr_pdu_print(ndo, tptr, 8); 348 349 tlen -= pdu_len; 350 tptr += pdu_len; 351 } 352 return; 353 trunc: 354 ND_PRINT((ndo, "\n\t[|RPKI-RTR]")); 355 } 356 357 /* 358 * Local Variables: 359 * c-style: whitesmith 360 * c-basic-offset: 4 361 * End: 362 */ 363