JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 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 | #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 | */ |