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@q-free.com) 16 */ 17 18 #define NETDISSECT_REWORKED 19 #ifdef HAVE_CONFIG_H 20 #include "config.h" 21 #endif 22 23 #include <tcpdump-stdinc.h> 24 25 #include "interface.h" 26 #include "extract.h" 27 #include "addrtoname.h" 28 29 30 /* 31 ETSI TS 102 636-5-1 V1.1.1 (2011-02) 32 Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking; 33 Part 5: Transport Protocols; Sub-part 1: Basic Transport Protocol 34 35 ETSI TS 102 636-4-1 V1.1.1 (2011-06) 36 Intelligent Transport Systems (ITS); Vehicular communications; GeoNetworking; 37 Part 4: Geographical addressing and forwarding for point-to-point and point-to-multipoint communications; 38 Sub-part 1: Media-Independent Functionality 39 */ 40 41 #define GEONET_ADDR_LEN 8 42 43 static const struct tok msg_type_values[] = { 44 { 0, "CAM" }, 45 { 1, "DENM" }, 46 { 101, "TPEGM" }, 47 { 102, "TSPDM" }, 48 { 103, "VPM" }, 49 { 104, "SRM" }, 50 { 105, "SLAM" }, 51 { 106, "ecoCAM" }, 52 { 107, "ITM" }, 53 { 150, "SA" }, 54 { 0, NULL } 55 }; 56 57 static void 58 print_btp_body(netdissect_options *ndo, 59 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 ND_PRINT((ndo, "; ItsPduHeader v:%d t:%d-%s", version, msg_type, msg_type_str)); 75 } 76 77 static void 78 print_btp(netdissect_options *ndo, 79 const u_char *bp) 80 { 81 uint16_t dest = EXTRACT_16BITS(bp+0); 82 uint16_t src = EXTRACT_16BITS(bp+2); 83 ND_PRINT((ndo, "; BTP Dst:%u Src:%u", dest, src)); 84 } 85 86 static void 87 print_long_pos_vector(netdissect_options *ndo, 88 const u_char *bp) 89 { 90 uint32_t lat, lon; 91 92 ND_PRINT((ndo, "GN_ADDR:%s ", linkaddr_string (ndo, bp, 0, GEONET_ADDR_LEN))); 93 94 lat = EXTRACT_32BITS(bp+12); 95 ND_PRINT((ndo, "lat:%d ", lat)); 96 lon = EXTRACT_32BITS(bp+16); 97 ND_PRINT((ndo, "lon:%d", lon)); 98 } 99 100 101 /* 102 * This is the top level routine of the printer. 'p' points 103 * to the geonet header of the packet. 104 */ 105 void 106 geonet_print(netdissect_options *ndo, const u_char *eth, const u_char *bp, u_int length) 107 { 108 ND_PRINT((ndo, "GeoNet src:%s; ", etheraddr_string(ndo, eth+6))); 109 110 if (length >= 36) { 111 /* Process Common Header */ 112 int version = bp[0] >> 4; 113 int next_hdr = bp[0] & 0x0f; 114 int hdr_type = bp[1] >> 4; 115 int hdr_subtype = bp[1] & 0x0f; 116 uint16_t payload_length = EXTRACT_16BITS(bp+4); 117 int hop_limit = bp[7]; 118 const char *next_hdr_txt = "Unknown"; 119 const char *hdr_type_txt = "Unknown"; 120 int hdr_size = -1; 121 122 switch (next_hdr) { 123 case 0: next_hdr_txt = "Any"; break; 124 case 1: next_hdr_txt = "BTP-A"; break; 125 case 2: next_hdr_txt = "BTP-B"; break; 126 case 3: next_hdr_txt = "IPv6"; break; 127 } 128 129 switch (hdr_type) { 130 case 0: hdr_type_txt = "Any"; break; 131 case 1: hdr_type_txt = "Beacon"; break; 132 case 2: hdr_type_txt = "GeoUnicast"; break; 133 case 3: switch (hdr_subtype) { 134 case 0: hdr_type_txt = "GeoAnycastCircle"; break; 135 case 1: hdr_type_txt = "GeoAnycastRect"; break; 136 case 2: hdr_type_txt = "GeoAnycastElipse"; break; 137 } 138 break; 139 case 4: switch (hdr_subtype) { 140 case 0: hdr_type_txt = "GeoBroadcastCircle"; break; 141 case 1: hdr_type_txt = "GeoBroadcastRect"; break; 142 case 2: hdr_type_txt = "GeoBroadcastElipse"; break; 143 } 144 break; 145 case 5: switch (hdr_subtype) { 146 case 0: hdr_type_txt = "TopoScopeBcast-SH"; break; 147 case 1: hdr_type_txt = "TopoScopeBcast-MH"; break; 148 } 149 break; 150 case 6: switch (hdr_subtype) { 151 case 0: hdr_type_txt = "LocService-Request"; break; 152 case 1: hdr_type_txt = "LocService-Reply"; break; 153 } 154 break; 155 } 156 157 ND_PRINT((ndo, "v:%d ", version)); 158 ND_PRINT((ndo, "NH:%d-%s ", next_hdr, next_hdr_txt)); 159 ND_PRINT((ndo, "HT:%d-%d-%s ", hdr_type, hdr_subtype, hdr_type_txt)); 160 ND_PRINT((ndo, "HopLim:%d ", hop_limit)); 161 ND_PRINT((ndo, "Payload:%d ", payload_length)); 162 print_long_pos_vector(ndo, bp + 8); 163 164 /* Skip Common Header */ 165 length -= 36; 166 bp += 36; 167 168 /* Process Extended Headers */ 169 switch (hdr_type) { 170 case 0: /* Any */ 171 hdr_size = 0; 172 break; 173 case 1: /* Beacon */ 174 hdr_size = 0; 175 break; 176 case 2: /* GeoUnicast */ 177 break; 178 case 3: switch (hdr_subtype) { 179 case 0: /* GeoAnycastCircle */ 180 break; 181 case 1: /* GeoAnycastRect */ 182 break; 183 case 2: /* GeoAnycastElipse */ 184 break; 185 } 186 break; 187 case 4: switch (hdr_subtype) { 188 case 0: /* GeoBroadcastCircle */ 189 break; 190 case 1: /* GeoBroadcastRect */ 191 break; 192 case 2: /* GeoBroadcastElipse */ 193 break; 194 } 195 break; 196 case 5: switch (hdr_subtype) { 197 case 0: /* TopoScopeBcast-SH */ 198 hdr_size = 0; 199 break; 200 case 1: /* TopoScopeBcast-MH */ 201 hdr_size = 68 - 36; 202 break; 203 } 204 break; 205 case 6: switch (hdr_subtype) { 206 case 0: /* LocService-Request */ 207 break; 208 case 1: /* LocService-Reply */ 209 break; 210 } 211 break; 212 } 213 214 /* Skip Extended headers */ 215 if (hdr_size >= 0) { 216 length -= hdr_size; 217 bp += hdr_size; 218 switch (next_hdr) { 219 case 0: /* Any */ 220 break; 221 case 1: 222 case 2: /* BTP A/B */ 223 print_btp(ndo, bp); 224 length -= 4; 225 bp += 4; 226 print_btp_body(ndo, bp, length); 227 break; 228 case 3: /* IPv6 */ 229 break; 230 } 231 } 232 } else { 233 ND_PRINT((ndo, "Malformed (small) ")); 234 } 235 236 /* Print user data part */ 237 if (ndo->ndo_vflag) 238 ND_DEFAULTPRINT(bp, length); 239 } 240 241 242 /* 243 * Local Variables: 244 * c-style: whitesmith 245 * c-basic-offset: 8 246 * End: 247 */ 248