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 #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         u_int16_t dest = EXTRACT_16BITS(bp+0);
  82         u_int16_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         u_int32_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                 u_int16_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  */