1 /* 2 * Copyright (c) 2013 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 * Original code by Ola Martin Lykkja (ola.lykkja (at) q-free.com) 16 */ 17 18 /* \summary: ISO CALM FAST and ETSI GeoNetworking printer */ 19 20 #ifdef HAVE_CONFIG_H 21 #include "config.h" 22 #endif 23 24 #include <netdissect-stdinc.h> 25 26 #include "netdissect.h" 27 #include "extract.h" 28 #include "addrtoname.h" 29 30 31 /* 32 ETSI TS 102 636-5-1 V1.1.1 (2011-02) 33 Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking; 34 Part 5: Transport Protocols; Sub-part 1: Basic Transport Protocol 35 36 ETSI TS 102 636-4-1 V1.1.1 (2011-06) 37 Intelligent Transport Systems (ITS); Vehicular communications; GeoNetworking; 38 Part 4: Geographical addressing and forwarding for point-to-point and point-to-multipoint communications; 39 Sub-part 1: Media-Independent Functionality 40 */ 41 42 #define GEONET_ADDR_LEN 8 43 44 static const struct tok msg_type_values[] = { 45 { 0, "CAM" }, 46 { 1, "DENM" }, 47 { 101, "TPEGM" }, 48 { 102, "TSPDM" }, 49 { 103, "VPM" }, 50 { 104, "SRM" }, 51 { 105, "SLAM" }, 52 { 106, "ecoCAM" }, 53 { 107, "ITM" }, 54 { 150, "SA" }, 55 { 0, NULL } 56 }; 57 58 static void 59 print_btp_body(netdissect_options *ndo, 60 const u_char *bp) 61 { 62 int version; 63 int msg_type; 64 const char *msg_type_str; 65 66 /* Assuming ItsDpuHeader */ 67 version = bp[0]; 68 msg_type = bp[1]; 69 msg_type_str = tok2str(msg_type_values, "unknown (%u)", msg_type); 70 71 ND_PRINT((ndo, "; ItsPduHeader v:%d t:%d-%s", version, msg_type, msg_type_str)); 72 } 73 74 static void 75 print_btp(netdissect_options *ndo, 76 const u_char *bp) 77 { 78 uint16_t dest = EXTRACT_16BITS(bp+0); 79 uint16_t src = EXTRACT_16BITS(bp+2); 80 ND_PRINT((ndo, "; BTP Dst:%u Src:%u", dest, src)); 81 } 82 83 static int 84 print_long_pos_vector(netdissect_options *ndo, 85 const u_char *bp) 86 { 87 uint32_t lat, lon; 88 89 if (!ND_TTEST2(*bp, GEONET_ADDR_LEN)) 90 return (-1); 91 ND_PRINT((ndo, "GN_ADDR:%s ", linkaddr_string (ndo, bp, 0, GEONET_ADDR_LEN))); 92 93 if (!ND_TTEST2(*(bp+12), 8)) 94 return (-1); 95 lat = EXTRACT_32BITS(bp+12); 96 ND_PRINT((ndo, "lat:%d ", lat)); 97 lon = EXTRACT_32BITS(bp+16); 98 ND_PRINT((ndo, "lon:%d", lon)); 99 return (0); 100 } 101 102 103 /* 104 * This is the top level routine of the printer. 'p' points 105 * to the geonet header of the packet. 106 */ 107 void 108 geonet_print(netdissect_options *ndo, const u_char *bp, u_int length, 109 const struct lladdr_info *src) 110 { 111 int version; 112 int next_hdr; 113 int hdr_type; 114 int hdr_subtype; 115 uint16_t payload_length; 116 int hop_limit; 117 const char *next_hdr_txt = "Unknown"; 118 const char *hdr_type_txt = "Unknown"; 119 int hdr_size = -1; 120 121 ND_PRINT((ndo, "GeoNet ")); 122 if (src != NULL) 123 ND_PRINT((ndo, "src:%s", (src->addr_string)(ndo, src->addr))); 124 ND_PRINT((ndo, "; ")); 125 126 /* Process Common Header */ 127 if (length < 36) 128 goto invalid; 129 130 ND_TCHECK2(*bp, 8); 131 version = bp[0] >> 4; 132 next_hdr = bp[0] & 0x0f; 133 hdr_type = bp[1] >> 4; 134 hdr_subtype = bp[1] & 0x0f; 135 payload_length = EXTRACT_16BITS(bp+4); 136 hop_limit = bp[7]; 137 138 switch (next_hdr) { 139 case 0: next_hdr_txt = "Any"; break; 140 case 1: next_hdr_txt = "BTP-A"; break; 141 case 2: next_hdr_txt = "BTP-B"; break; 142 case 3: next_hdr_txt = "IPv6"; break; 143 } 144 145 switch (hdr_type) { 146 case 0: hdr_type_txt = "Any"; break; 147 case 1: hdr_type_txt = "Beacon"; break; 148 case 2: hdr_type_txt = "GeoUnicast"; break; 149 case 3: switch (hdr_subtype) { 150 case 0: hdr_type_txt = "GeoAnycastCircle"; break; 151 case 1: hdr_type_txt = "GeoAnycastRect"; break; 152 case 2: hdr_type_txt = "GeoAnycastElipse"; break; 153 } 154 break; 155 case 4: switch (hdr_subtype) { 156 case 0: hdr_type_txt = "GeoBroadcastCircle"; break; 157 case 1: hdr_type_txt = "GeoBroadcastRect"; break; 158 case 2: hdr_type_txt = "GeoBroadcastElipse"; break; 159 } 160 break; 161 case 5: switch (hdr_subtype) { 162 case 0: hdr_type_txt = "TopoScopeBcast-SH"; break; 163 case 1: hdr_type_txt = "TopoScopeBcast-MH"; break; 164 } 165 break; 166 case 6: switch (hdr_subtype) { 167 case 0: hdr_type_txt = "LocService-Request"; break; 168 case 1: hdr_type_txt = "LocService-Reply"; break; 169 } 170 break; 171 } 172 173 ND_PRINT((ndo, "v:%d ", version)); 174 ND_PRINT((ndo, "NH:%d-%s ", next_hdr, next_hdr_txt)); 175 ND_PRINT((ndo, "HT:%d-%d-%s ", hdr_type, hdr_subtype, hdr_type_txt)); 176 ND_PRINT((ndo, "HopLim:%d ", hop_limit)); 177 ND_PRINT((ndo, "Payload:%d ", payload_length)); 178 if (print_long_pos_vector(ndo, bp + 8) == -1) 179 goto trunc; 180 181 /* Skip Common Header */ 182 length -= 36; 183 bp += 36; 184 185 /* Process Extended Headers */ 186 switch (hdr_type) { 187 case 0: /* Any */ 188 hdr_size = 0; 189 break; 190 case 1: /* Beacon */ 191 hdr_size = 0; 192 break; 193 case 2: /* GeoUnicast */ 194 break; 195 case 3: switch (hdr_subtype) { 196 case 0: /* GeoAnycastCircle */ 197 break; 198 case 1: /* GeoAnycastRect */ 199 break; 200 case 2: /* GeoAnycastElipse */ 201 break; 202 } 203 break; 204 case 4: switch (hdr_subtype) { 205 case 0: /* GeoBroadcastCircle */ 206 break; 207 case 1: /* GeoBroadcastRect */ 208 break; 209 case 2: /* GeoBroadcastElipse */ 210 break; 211 } 212 break; 213 case 5: switch (hdr_subtype) { 214 case 0: /* TopoScopeBcast-SH */ 215 hdr_size = 0; 216 break; 217 case 1: /* TopoScopeBcast-MH */ 218 hdr_size = 68 - 36; 219 break; 220 } 221 break; 222 case 6: switch (hdr_subtype) { 223 case 0: /* LocService-Request */ 224 break; 225 case 1: /* LocService-Reply */ 226 break; 227 } 228 break; 229 } 230 231 /* Skip Extended headers */ 232 if (hdr_size >= 0) { 233 if (length < (u_int)hdr_size) 234 goto invalid; 235 ND_TCHECK2(*bp, hdr_size); 236 length -= hdr_size; 237 bp += hdr_size; 238 switch (next_hdr) { 239 case 0: /* Any */ 240 break; 241 case 1: 242 case 2: /* BTP A/B */ 243 if (length < 4) 244 goto invalid; 245 ND_TCHECK2(*bp, 4); 246 print_btp(ndo, bp); 247 length -= 4; 248 bp += 4; 249 if (length >= 2) { 250 /* 251 * XXX - did print_btp_body() 252 * return if length < 2 253 * because this is optional, 254 * or was that just not 255 * reporting genuine errors? 256 */ 257 ND_TCHECK2(*bp, 2); 258 print_btp_body(ndo, bp); 259 } 260 break; 261 case 3: /* IPv6 */ 262 break; 263 } 264 } 265 266 /* Print user data part */ 267 if (ndo->ndo_vflag) 268 ND_DEFAULTPRINT(bp, length); 269 return; 270 271 invalid: 272 ND_PRINT((ndo, " Malformed (small) ")); 273 /* XXX - print the remaining data as hex? */ 274 return; 275 276 trunc: 277 ND_PRINT((ndo, "[|geonet]")); 278 } 279 280 281 /* 282 * Local Variables: 283 * c-style: whitesmith 284 * c-basic-offset: 8 285 * End: 286 */ 287
