The Tcpdump Group git mirrors - tcpdump/blob - print-geonet.c

   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 <stdio.h>
  25 #include <string.h>
  26
  27 #include "interface.h"
  28 #include "extract.h"
  29 #include "addrtoname.h"
  30
  31
  32 /*
  33    ETSI TS 102 636-5-1 V1.1.1 (2011-02)
  34    Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking;
  35    Part 5: Transport Protocols; Sub-part 1: Basic Transport Protocol
  36
  37    ETSI TS 102 636-4-1 V1.1.1 (2011-06)
  38    Intelligent Transport Systems (ITS); Vehicular communications; GeoNetworking;
  39    Part 4: Geographical addressing and forwarding for point-to-point and point-to-multipoint communications;
  40    Sub-part 1: Media-Independent Functionality
  41 */
  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(const u_char *bp, u_int length)
  59 {
  60         int version;
  61         int msg_type;
  62         const char *msg_type_str;
  63
  64         if (length <= 2) {
  65                 return;
  66         }
  67
  68         /* Assuming ItsDpuHeader */
  69         version = bp[0];
  70         msg_type = bp[1];
  71         msg_type_str = tok2str(msg_type_values, "unknown (%u)", msg_type);
  72
  73         printf("; ItsPduHeader v:%d t:%d-%s", version, msg_type, msg_type_str);
  74 }
  75
  76 static void
  77 print_btp(const u_char *bp)
  78 {
  79         u_int16_t dest = EXTRACT_16BITS(bp+0);
  80         u_int16_t src = EXTRACT_16BITS(bp+2);
  81         printf("; BTP Dst:%u Src:%u", dest, src);
  82 }
  83
  84 static void
  85 print_long_pos_vector(const u_char *bp)
  86 {
  87         int i;
  88         u_int32_t lat, lon;
  89
  90         printf("GN_ADDR:");
  91         for (i=0; i<8; i++) {
  92                 if (i) printf(":");
  93                 printf("%02x", bp[i]);
  94         }
  95         printf(" ");
  96
  97         lat = EXTRACT_32BITS(bp+12);
  98         printf("lat:%d ", lat);
  99         lon = EXTRACT_32BITS(bp+16);
 100         printf("lon:%d", lon);
 101 }
 102
 103
 104 /*
 105  * This is the top level routine of the printer.  'p' points
 106  * to the geonet header of the packet.
 107  */
 108 void
 109 geonet_print(netdissect_options *ndo, const u_char *eth, const u_char *bp, u_int length)
 110 {
 111         printf("GeoNet src:%s; ", etheraddr_string(eth+6));
 112
 113         if (length >= 36) {
 114                 /* Process Common Header */
 115                 int version = bp[0] >> 4;
 116                 int next_hdr = bp[0] & 0x0f;
 117                 int hdr_type = bp[1] >> 4;
 118                 int hdr_subtype = bp[1] & 0x0f;
 119                 u_int16_t payload_length = EXTRACT_16BITS(bp+4);
 120                 int hop_limit = bp[7];
 121                 const char *next_hdr_txt = "Unknown";
 122                 const char *hdr_type_txt = "Unknown";
 123                 int hdr_size = -1;
 124
 125                 switch (next_hdr) {
 126                         case 0: next_hdr_txt = "Any"; break;
 127                         case 1: next_hdr_txt = "BTP-A"; break;
 128                         case 2: next_hdr_txt = "BTP-B"; break;
 129                         case 3: next_hdr_txt = "IPv6"; break;
 130                 }
 131
 132                 switch (hdr_type) {
 133                         case 0: hdr_type_txt = "Any"; break;
 134                         case 1: hdr_type_txt = "Beacon"; break;
 135                         case 2: hdr_type_txt = "GeoUnicast"; break;
 136                         case 3: switch (hdr_subtype) {
 137                                         case 0: hdr_type_txt = "GeoAnycastCircle"; break;
 138                                         case 1: hdr_type_txt = "GeoAnycastRect"; break;
 139                                         case 2: hdr_type_txt = "GeoAnycastElipse"; break;
 140                                 }
 141                                 break;
 142                         case 4: switch (hdr_subtype) {
 143                                         case 0: hdr_type_txt = "GeoBroadcastCircle"; break;
 144                                         case 1: hdr_type_txt = "GeoBroadcastRect"; break;
 145                                         case 2: hdr_type_txt = "GeoBroadcastElipse"; break;
 146                                 }
 147                                 break;
 148                         case 5: switch (hdr_subtype) {
 149                                         case 0: hdr_type_txt = "TopoScopeBcast-SH"; break;
 150                                         case 1: hdr_type_txt = "TopoScopeBcast-MH"; break;
 151                                 }
 152                                 break;
 153                         case 6: switch (hdr_subtype) {
 154                                         case 0: hdr_type_txt = "LocService-Request"; break;
 155                                         case 1: hdr_type_txt = "LocService-Reply"; break;
 156                                 }
 157                                 break;
 158                 }
 159
 160                 printf("v:%d ", version);
 161                 printf("NH:%d-%s ", next_hdr, next_hdr_txt);
 162                 printf("HT:%d-%d-%s ", hdr_type, hdr_subtype, hdr_type_txt);
 163                 printf("HopLim:%d ", hop_limit);
 164                 printf("Payload:%d ", payload_length);
 165                 print_long_pos_vector(bp + 8);
 166
 167                 /* Skip Common Header */
 168                 length -= 36;
 169                 bp += 36;
 170
 171                 /* Process Extended Headers */
 172                 switch (hdr_type) {
 173                         case 0: /* Any */
 174                                 hdr_size = 0;
 175                                 break;
 176                         case 1: /* Beacon */
 177                                 hdr_size = 0;
 178                                 break;
 179                         case 2: /* GeoUnicast */
 180                                 break;
 181                         case 3: switch (hdr_subtype) {
 182                                         case 0: /* GeoAnycastCircle */
 183                                                 break;
 184                                         case 1: /* GeoAnycastRect */
 185                                                 break;
 186                                         case 2: /* GeoAnycastElipse */
 187                                                 break;
 188                                 }
 189                                 break;
 190                         case 4: switch (hdr_subtype) {
 191                                         case 0: /* GeoBroadcastCircle */
 192                                                 break;
 193                                         case 1: /* GeoBroadcastRect */
 194                                                 break;
 195                                         case 2: /* GeoBroadcastElipse */
 196                                                 break;
 197                                 }
 198                                 break;
 199                         case 5: switch (hdr_subtype) {
 200                                         case 0: /* TopoScopeBcast-SH */
 201                                                 hdr_size = 0;
 202                                                 break;
 203                                         case 1: /* TopoScopeBcast-MH */
 204                                                 hdr_size = 68 - 36;
 205                                                 break;
 206                                 }
 207                                 break;
 208                         case 6: switch (hdr_subtype) {
 209                                         case 0: /* LocService-Request */
 210                                                 break;
 211                                         case 1: /* LocService-Reply */
 212                                                 break;
 213                                 }
 214                                 break;
 215                 }
 216
 217                 /* Skip Extended headers */
 218                 if (hdr_size >= 0) {
 219                         length -= hdr_size;
 220                         bp += hdr_size;
 221                         switch (next_hdr) {
 222                                 case 0: /* Any */
 223                                         break;
 224                                 case 1:
 225                                 case 2: /* BTP A/B */
 226                                         print_btp(bp);
 227                                         length -= 4;
 228                                         bp += 4;
 229                                         print_btp_body(bp, length);
 230                                         break;
 231                                 case 3: /* IPv6 */
 232                                         break;
 233                         }
 234                 }
 235         } else {
 236                 printf("Malformed (small) ");
 237         }
 238
 239         /* Print user data part */
 240         if (ndo->ndo_vflag)
 241                 default_print(bp, length);
 242 }
 243
 244
 245 /*
 246  * Local Variables:
 247  * c-style: whitesmith
 248  * c-basic-offset: 8
 249  * End:
 250  */