contrib/tcpdump/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)
  60 {
  61         int version;
  62         int msg_type;
  63         const char *msg_type_str;
  64
  65         /* Assuming ItsDpuHeader */
  66         version = bp[0];
  67         msg_type = bp[1];
  68         msg_type_str = tok2str(msg_type_values, "unknown (%u)", msg_type);
  69
  70         ND_PRINT((ndo, "; ItsPduHeader v:%d t:%d-%s", version, msg_type, msg_type_str));
  71 }
  72
  73 static void
  74 print_btp(netdissect_options *ndo,
  75           const u_char *bp)
  76 {
  77         uint16_t dest = EXTRACT_16BITS(bp+0);
  78         uint16_t src = EXTRACT_16BITS(bp+2);
  79         ND_PRINT((ndo, "; BTP Dst:%u Src:%u", dest, src));
  80 }
  81
  82 static int
  83 print_long_pos_vector(netdissect_options *ndo,
  84                       const u_char *bp)
  85 {
  86         uint32_t lat, lon;
  87
  88         ND_PRINT((ndo, "GN_ADDR:%s ", linkaddr_string (ndo, bp, 0, GEONET_ADDR_LEN)));
  89
  90         if (!ND_TTEST2(*(bp+12), 8))
  91                 return (-1);
  92         lat = EXTRACT_32BITS(bp+12);
  93         ND_PRINT((ndo, "lat:%d ", lat));
  94         lon = EXTRACT_32BITS(bp+16);
  95         ND_PRINT((ndo, "lon:%d", lon));
  96         return (0);
  97 }
  98
  99
 100 /*
 101  * This is the top level routine of the printer.  'p' points
 102  * to the geonet header of the packet.
 103  */
 104 void
 105 geonet_print(netdissect_options *ndo, const u_char *eth, const u_char *bp, u_int length)
 106 {
 107         int version;
 108         int next_hdr;
 109         int hdr_type;
 110         int hdr_subtype;
 111         uint16_t payload_length;
 112         int hop_limit;
 113         const char *next_hdr_txt = "Unknown";
 114         const char *hdr_type_txt = "Unknown";
 115         int hdr_size = -1;
 116
 117         ND_PRINT((ndo, "GeoNet src:%s; ", etheraddr_string(ndo, eth+6)));
 118
 119         /* Process Common Header */
 120         if (length < 36)
 121                 goto malformed;
 122
 123         ND_TCHECK2(*bp, 7);
 124         version = bp[0] >> 4;
 125         next_hdr = bp[0] & 0x0f;
 126         hdr_type = bp[1] >> 4;
 127         hdr_subtype = bp[1] & 0x0f;
 128         payload_length = EXTRACT_16BITS(bp+4);
 129         hop_limit = bp[7];
 130
 131         switch (next_hdr) {
 132                 case 0: next_hdr_txt = "Any"; break;
 133                 case 1: next_hdr_txt = "BTP-A"; break;
 134                 case 2: next_hdr_txt = "BTP-B"; break;
 135                 case 3: next_hdr_txt = "IPv6"; break;
 136         }
 137
 138         switch (hdr_type) {
 139                 case 0: hdr_type_txt = "Any"; break;
 140                 case 1: hdr_type_txt = "Beacon"; break;
 141                 case 2: hdr_type_txt = "GeoUnicast"; break;
 142                 case 3: switch (hdr_subtype) {
 143                                 case 0: hdr_type_txt = "GeoAnycastCircle"; break;
 144                                 case 1: hdr_type_txt = "GeoAnycastRect"; break;
 145                                 case 2: hdr_type_txt = "GeoAnycastElipse"; break;
 146                         }
 147                         break;
 148                 case 4: switch (hdr_subtype) {
 149                                 case 0: hdr_type_txt = "GeoBroadcastCircle"; break;
 150                                 case 1: hdr_type_txt = "GeoBroadcastRect"; break;
 151                                 case 2: hdr_type_txt = "GeoBroadcastElipse"; break;
 152                         }
 153                         break;
 154                 case 5: switch (hdr_subtype) {
 155                                 case 0: hdr_type_txt = "TopoScopeBcast-SH"; break;
 156                                 case 1: hdr_type_txt = "TopoScopeBcast-MH"; break;
 157                         }
 158                         break;
 159                 case 6: switch (hdr_subtype) {
 160                                 case 0: hdr_type_txt = "LocService-Request"; break;
 161                                 case 1: hdr_type_txt = "LocService-Reply"; break;
 162                         }
 163                         break;
 164         }
 165
 166         ND_PRINT((ndo, "v:%d ", version));
 167         ND_PRINT((ndo, "NH:%d-%s ", next_hdr, next_hdr_txt));
 168         ND_PRINT((ndo, "HT:%d-%d-%s ", hdr_type, hdr_subtype, hdr_type_txt));
 169         ND_PRINT((ndo, "HopLim:%d ", hop_limit));
 170         ND_PRINT((ndo, "Payload:%d ", payload_length));
 171         if (print_long_pos_vector(ndo, bp + 8) == -1)
 172                 goto trunc;
 173
 174         /* Skip Common Header */
 175         length -= 36;
 176         bp += 36;
 177
 178         /* Process Extended Headers */
 179         switch (hdr_type) {
 180                 case 0: /* Any */
 181                         hdr_size = 0;
 182                         break;
 183                 case 1: /* Beacon */
 184                         hdr_size = 0;
 185                         break;
 186                 case 2: /* GeoUnicast */
 187                         break;
 188                 case 3: switch (hdr_subtype) {
 189                                 case 0: /* GeoAnycastCircle */
 190                                         break;
 191                                 case 1: /* GeoAnycastRect */
 192                                         break;
 193                                 case 2: /* GeoAnycastElipse */
 194                                         break;
 195                         }
 196                         break;
 197                 case 4: switch (hdr_subtype) {
 198                                 case 0: /* GeoBroadcastCircle */
 199                                         break;
 200                                 case 1: /* GeoBroadcastRect */
 201                                         break;
 202                                 case 2: /* GeoBroadcastElipse */
 203                                         break;
 204                         }
 205                         break;
 206                 case 5: switch (hdr_subtype) {
 207                                 case 0: /* TopoScopeBcast-SH */
 208                                         hdr_size = 0;
 209                                         break;
 210                                 case 1: /* TopoScopeBcast-MH */
 211                                         hdr_size = 68 - 36;
 212                                         break;
 213                         }
 214                         break;
 215                 case 6: switch (hdr_subtype) {
 216                                 case 0: /* LocService-Request */
 217                                         break;
 218                                 case 1: /* LocService-Reply */
 219                                         break;
 220                         }
 221                         break;
 222         }
 223
 224         /* Skip Extended headers */
 225         if (hdr_size >= 0) {
 226                 if (length < (u_int)hdr_size)
 227                         goto malformed;
 228                 ND_TCHECK2(*bp, hdr_size);
 229                 length -= hdr_size;
 230                 bp += hdr_size;
 231                 switch (next_hdr) {
 232                         case 0: /* Any */
 233                                 break;
 234                         case 1:
 235                         case 2: /* BTP A/B */
 236                                 if (length < 4)
 237                                         goto malformed;
 238                                 ND_TCHECK2(*bp, 4);
 239                                 print_btp(ndo, bp);
 240                                 length -= 4;
 241                                 bp += 4;
 242                                 if (length >= 2) {
 243                                         /*
 244                                          * XXX - did print_btp_body()
 245                                          * return if length < 2
 246                                          * because this is optional,
 247                                          * or was that just not
 248                                          * reporting genuine errors?
 249                                          */
 250                                         ND_TCHECK2(*bp, 2);
 251                                         print_btp_body(ndo, bp);
 252                                 }
 253                                 break;
 254                         case 3: /* IPv6 */
 255                                 break;
 256                 }
 257         }
 258
 259         /* Print user data part */
 260         if (ndo->ndo_vflag)
 261                 ND_DEFAULTPRINT(bp, length);
 262         return;
 263
 264 malformed:
 265         ND_PRINT((ndo, " Malformed (small) "));
 266         /* XXX - print the remaining data as hex? */
 267         return;
 268
 269 trunc:
 270         ND_PRINT((ndo, "[|geonet]"));
 271 }
 272
 273
 274 /*
 275  * Local Variables:
 276  * c-style: whitesmith
 277  * c-basic-offset: 8
 278  * End:
 279  */