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 /* \summary: ISO CALM FAST and ETSI GeoNetworking printer */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include <netdissect-stdinc.h>
  25
  26 #include "netdissect.h"
  27 #include "extract.h"
  28 #include "addrtoname.h"
  29
  30
  31 /*
  32    ETSI TS 102 636-5-1 V1.1.1 (2011-02)
  33    Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking;
  34    Part 5: Transport Protocols; Sub-part 1: Basic Transport Protocol
  35
  36    ETSI TS 102 636-4-1 V1.1.1 (2011-06)
  37    Intelligent Transport Systems (ITS); Vehicular communications; GeoNetworking;
  38    Part 4: Geographical addressing and forwarding for point-to-point and point-to-multipoint communications;
  39    Sub-part 1: Media-Independent Functionality
  40 */
  41
  42 #define GEONET_ADDR_LEN 8
  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(netdissect_options *ndo,
  60                const u_char *bp)
  61 {
  62         int version;
  63         int msg_type;
  64         const char *msg_type_str;
  65
  66         /* Assuming ItsDpuHeader */
  67         version = bp[0];
  68         msg_type = bp[1];
  69         msg_type_str = tok2str(msg_type_values, "unknown (%u)", msg_type);
  70
  71         ND_PRINT((ndo, "; ItsPduHeader v:%d t:%d-%s", version, msg_type, msg_type_str));
  72 }
  73
  74 static void
  75 print_btp(netdissect_options *ndo,
  76           const u_char *bp)
  77 {
  78         uint16_t dest = EXTRACT_16BITS(bp+0);
  79         uint16_t src = EXTRACT_16BITS(bp+2);
  80         ND_PRINT((ndo, "; BTP Dst:%u Src:%u", dest, src));
  81 }
  82
  83 static int
  84 print_long_pos_vector(netdissect_options *ndo,
  85                       const u_char *bp)
  86 {
  87         uint32_t lat, lon;
  88
  89         ND_PRINT((ndo, "GN_ADDR:%s ", linkaddr_string (ndo, bp, 0, GEONET_ADDR_LEN)));
  90
  91         if (!ND_TTEST2(*(bp+12), 8))
  92                 return (-1);
  93         lat = EXTRACT_32BITS(bp+12);
  94         ND_PRINT((ndo, "lat:%d ", lat));
  95         lon = EXTRACT_32BITS(bp+16);
  96         ND_PRINT((ndo, "lon:%d", lon));
  97         return (0);
  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         int version;
 109         int next_hdr;
 110         int hdr_type;
 111         int hdr_subtype;
 112         uint16_t payload_length;
 113         int hop_limit;
 114         const char *next_hdr_txt = "Unknown";
 115         const char *hdr_type_txt = "Unknown";
 116         int hdr_size = -1;
 117
 118         ND_PRINT((ndo, "GeoNet src:%s; ", etheraddr_string(ndo, eth+6)));
 119
 120         /* Process Common Header */
 121         if (length < 36)
 122                 goto invalid;
 123
 124         ND_TCHECK2(*bp, 7);
 125         version = bp[0] >> 4;
 126         next_hdr = bp[0] & 0x0f;
 127         hdr_type = bp[1] >> 4;
 128         hdr_subtype = bp[1] & 0x0f;
 129         payload_length = EXTRACT_16BITS(bp+4);
 130         hop_limit = bp[7];
 131
 132         switch (next_hdr) {
 133                 case 0: next_hdr_txt = "Any"; break;
 134                 case 1: next_hdr_txt = "BTP-A"; break;
 135                 case 2: next_hdr_txt = "BTP-B"; break;
 136                 case 3: next_hdr_txt = "IPv6"; break;
 137         }
 138
 139         switch (hdr_type) {
 140                 case 0: hdr_type_txt = "Any"; break;
 141                 case 1: hdr_type_txt = "Beacon"; break;
 142                 case 2: hdr_type_txt = "GeoUnicast"; break;
 143                 case 3: switch (hdr_subtype) {
 144                                 case 0: hdr_type_txt = "GeoAnycastCircle"; break;
 145                                 case 1: hdr_type_txt = "GeoAnycastRect"; break;
 146                                 case 2: hdr_type_txt = "GeoAnycastElipse"; break;
 147                         }
 148                         break;
 149                 case 4: switch (hdr_subtype) {
 150                                 case 0: hdr_type_txt = "GeoBroadcastCircle"; break;
 151                                 case 1: hdr_type_txt = "GeoBroadcastRect"; break;
 152                                 case 2: hdr_type_txt = "GeoBroadcastElipse"; break;
 153                         }
 154                         break;
 155                 case 5: switch (hdr_subtype) {
 156                                 case 0: hdr_type_txt = "TopoScopeBcast-SH"; break;
 157                                 case 1: hdr_type_txt = "TopoScopeBcast-MH"; break;
 158                         }
 159                         break;
 160                 case 6: switch (hdr_subtype) {
 161                                 case 0: hdr_type_txt = "LocService-Request"; break;
 162                                 case 1: hdr_type_txt = "LocService-Reply"; break;
 163                         }
 164                         break;
 165         }
 166
 167         ND_PRINT((ndo, "v:%d ", version));
 168         ND_PRINT((ndo, "NH:%d-%s ", next_hdr, next_hdr_txt));
 169         ND_PRINT((ndo, "HT:%d-%d-%s ", hdr_type, hdr_subtype, hdr_type_txt));
 170         ND_PRINT((ndo, "HopLim:%d ", hop_limit));
 171         ND_PRINT((ndo, "Payload:%d ", payload_length));
 172         if (print_long_pos_vector(ndo, bp + 8) == -1)
 173                 goto trunc;
 174
 175         /* Skip Common Header */
 176         length -= 36;
 177         bp += 36;
 178
 179         /* Process Extended Headers */
 180         switch (hdr_type) {
 181                 case 0: /* Any */
 182                         hdr_size = 0;
 183                         break;
 184                 case 1: /* Beacon */
 185                         hdr_size = 0;
 186                         break;
 187                 case 2: /* GeoUnicast */
 188                         break;
 189                 case 3: switch (hdr_subtype) {
 190                                 case 0: /* GeoAnycastCircle */
 191                                         break;
 192                                 case 1: /* GeoAnycastRect */
 193                                         break;
 194                                 case 2: /* GeoAnycastElipse */
 195                                         break;
 196                         }
 197                         break;
 198                 case 4: switch (hdr_subtype) {
 199                                 case 0: /* GeoBroadcastCircle */
 200                                         break;
 201                                 case 1: /* GeoBroadcastRect */
 202                                         break;
 203                                 case 2: /* GeoBroadcastElipse */
 204                                         break;
 205                         }
 206                         break;
 207                 case 5: switch (hdr_subtype) {
 208                                 case 0: /* TopoScopeBcast-SH */
 209                                         hdr_size = 0;
 210                                         break;
 211                                 case 1: /* TopoScopeBcast-MH */
 212                                         hdr_size = 68 - 36;
 213                                         break;
 214                         }
 215                         break;
 216                 case 6: switch (hdr_subtype) {
 217                                 case 0: /* LocService-Request */
 218                                         break;
 219                                 case 1: /* LocService-Reply */
 220                                         break;
 221                         }
 222                         break;
 223         }
 224
 225         /* Skip Extended headers */
 226         if (hdr_size >= 0) {
 227                 if (length < (u_int)hdr_size)
 228                         goto invalid;
 229                 ND_TCHECK2(*bp, hdr_size);
 230                 length -= hdr_size;
 231                 bp += hdr_size;
 232                 switch (next_hdr) {
 233                         case 0: /* Any */
 234                                 break;
 235                         case 1:
 236                         case 2: /* BTP A/B */
 237                                 if (length < 4)
 238                                         goto invalid;
 239                                 ND_TCHECK2(*bp, 4);
 240                                 print_btp(ndo, bp);
 241                                 length -= 4;
 242                                 bp += 4;
 243                                 if (length >= 2) {
 244                                         /*
 245                                          * XXX - did print_btp_body()
 246                                          * return if length < 2
 247                                          * because this is optional,
 248                                          * or was that just not
 249                                          * reporting genuine errors?
 250                                          */
 251                                         ND_TCHECK2(*bp, 2);
 252                                         print_btp_body(ndo, bp);
 253                                 }
 254                                 break;
 255                         case 3: /* IPv6 */
 256                                 break;
 257                 }
 258         }
 259
 260         /* Print user data part */
 261         if (ndo->ndo_vflag)
 262                 ND_DEFAULTPRINT(bp, length);
 263         return;
 264
 265 invalid:
 266         ND_PRINT((ndo, " Malformed (small) "));
 267         /* XXX - print the remaining data as hex? */
 268         return;
 269
 270 trunc:
 271         ND_PRINT((ndo, "[|geonet]"));
 272 }
 273
 274
 275 /*
 276  * Local Variables:
 277  * c-style: whitesmith
 278  * c-basic-offset: 8
 279  * End:
 280  */