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 <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  */