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 #ifdef HAVE_CONFIG_H 19 #include "config.h" 20 #endif 21 22 #include <tcpdump-stdinc.h> 23 24 #include <pcap.h> 25 #include <stdio.h> 26 #include <string.h> 27 28 #include "interface.h" 29 #include "extract.h" 30 #include "addrtoname.h" 31 32 33 /* 34 ETSI TS 102 636-5-1 V1.1.1 (2011-02) 35 Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking; 36 Part 5: Transport Protocols; Sub-part 1: Basic Transport Protocol 37 38 ETSI TS 102 636-4-1 V1.1.1 (2011-06) 39 Intelligent Transport Systems (ITS); Vehicular communications; GeoNetworking; 40 Part 4: Geographical addressing and forwarding for point-to-point and point-to-multipoint communications; 41 Sub-part 1: Media-Independent Functionality 42 */ 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(const u_char *bp, u_int length) 60 { 61 int version; 62 int msg_type; 63 const char *msg_type_str; 64 65 if (length <= 2) { 66 return; 67 } 68 69 /* Assuming ItsDpuHeader */ 70 version = bp[0]; 71 msg_type = bp[1]; 72 msg_type_str = tok2str(msg_type_values, "unknown (%u)", msg_type); 73 74 printf("; ItsPduHeader v:%d t:%d-%s", version, msg_type, msg_type_str); 75 } 76 77 static void 78 print_btp(const u_char *bp) 79 { 80 u_int16_t dest = EXTRACT_16BITS(bp+0); 81 u_int16_t src = EXTRACT_16BITS(bp+2); 82 printf("; BTP Dst:%u Src:%u", dest, src); 83 } 84 85 static void 86 print_long_pos_vector(const u_char *bp) 87 { 88 int i; 89 u_int32_t lat, lon; 90 91 printf("GN_ADDR:"); 92 for (i=0; i<8; i++) { 93 if (i) printf(":"); 94 printf("%02x", bp[i]); 95 } 96 printf(" "); 97 98 lat = EXTRACT_32BITS(bp+12); 99 printf("lat:%d ", lat); 100 lon = EXTRACT_32BITS(bp+16); 101 printf("lon:%d", lon); 102 } 103 104 105 /* 106 * This is the top level routine of the printer. 'p' points 107 * to the geonet header of the packet. 108 */ 109 void 110 geonet_print(netdissect_options *ndo, const u_char *eth, const u_char *bp, u_int length) 111 { 112 printf("GeoNet src:%s; ", etheraddr_string(eth+6)); 113 114 if (length >= 36) { 115 /* Process Common Header */ 116 int version = bp[0] >> 4; 117 int next_hdr = bp[0] & 0x0f; 118 int hdr_type = bp[1] >> 4; 119 int hdr_subtype = bp[1] & 0x0f; 120 u_int16_t payload_length = EXTRACT_16BITS(bp+4); 121 int hop_limit = bp[7]; 122 const char *next_hdr_txt = "Unknown"; 123 const char *hdr_type_txt = "Unknown"; 124 int hdr_size = -1; 125 126 switch (next_hdr) { 127 case 0: next_hdr_txt = "Any"; break; 128 case 1: next_hdr_txt = "BTP-A"; break; 129 case 2: next_hdr_txt = "BTP-B"; break; 130 case 3: next_hdr_txt = "IPv6"; break; 131 } 132 133 switch (hdr_type) { 134 case 0: hdr_type_txt = "Any"; break; 135 case 1: hdr_type_txt = "Beacon"; break; 136 case 2: hdr_type_txt = "GeoUnicast"; break; 137 case 3: switch (hdr_subtype) { 138 case 0: hdr_type_txt = "GeoAnycastCircle"; break; 139 case 1: hdr_type_txt = "GeoAnycastRect"; break; 140 case 2: hdr_type_txt = "GeoAnycastElipse"; break; 141 } 142 break; 143 case 4: switch (hdr_subtype) { 144 case 0: hdr_type_txt = "GeoBroadcastCircle"; break; 145 case 1: hdr_type_txt = "GeoBroadcastRect"; break; 146 case 2: hdr_type_txt = "GeoBroadcastElipse"; break; 147 } 148 break; 149 case 5: switch (hdr_subtype) { 150 case 0: hdr_type_txt = "TopoScopeBcast-SH"; break; 151 case 1: hdr_type_txt = "TopoScopeBcast-MH"; break; 152 } 153 break; 154 case 6: switch (hdr_subtype) { 155 case 0: hdr_type_txt = "LocService-Request"; break; 156 case 1: hdr_type_txt = "LocService-Reply"; break; 157 } 158 break; 159 } 160 161 printf("v:%d ", version); 162 printf("NH:%d-%s ", next_hdr, next_hdr_txt); 163 printf("HT:%d-%d-%s ", hdr_type, hdr_subtype, hdr_type_txt); 164 printf("HopLim:%d ", hop_limit); 165 printf("Payload:%d ", payload_length); 166 print_long_pos_vector(bp + 8); 167 168 /* Skip Common Header */ 169 length -= 36; 170 bp += 36; 171 172 /* Process Extended Headers */ 173 switch (hdr_type) { 174 case 0: /* Any */ 175 hdr_size = 0; 176 break; 177 case 1: /* Beacon */ 178 hdr_size = 0; 179 break; 180 case 2: /* GeoUnicast */ 181 break; 182 case 3: switch (hdr_subtype) { 183 case 0: /* GeoAnycastCircle */ 184 break; 185 case 1: /* GeoAnycastRect */ 186 break; 187 case 2: /* GeoAnycastElipse */ 188 break; 189 } 190 break; 191 case 4: switch (hdr_subtype) { 192 case 0: /* GeoBroadcastCircle */ 193 break; 194 case 1: /* GeoBroadcastRect */ 195 break; 196 case 2: /* GeoBroadcastElipse */ 197 break; 198 } 199 break; 200 case 5: switch (hdr_subtype) { 201 case 0: /* TopoScopeBcast-SH */ 202 hdr_size = 0; 203 break; 204 case 1: /* TopoScopeBcast-MH */ 205 hdr_size = 68 - 36; 206 break; 207 } 208 break; 209 case 6: switch (hdr_subtype) { 210 case 0: /* LocService-Request */ 211 break; 212 case 1: /* LocService-Reply */ 213 break; 214 } 215 break; 216 } 217 218 /* Skip Extended headers */ 219 if (hdr_size >= 0) { 220 length -= hdr_size; 221 bp += hdr_size; 222 switch (next_hdr) { 223 case 0: /* Any */ 224 break; 225 case 1: 226 case 2: /* BTP A/B */ 227 print_btp(bp); 228 length -= 4; 229 bp += 4; 230 print_btp_body(bp, length); 231 break; 232 case 3: /* IPv6 */ 233 break; 234 } 235 } 236 } else { 237 printf("Malformed (small) "); 238 } 239 240 /* Print user data part */ 241 if (ndo->ndo_vflag) 242 default_print(bp, length); 243 } 244 245 246 /* 247 * Local Variables: 248 * c-style: whitesmith 249 * c-basic-offset: 8 250 * End: 251 */ 252
