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 "netdissect.h"
  25 #include "extract.h"
  26 #include "addrtoname.h"
  27
  28
  29 /*
  30    ETSI TS 102 636-5-1 V1.1.1 (2011-02)
  31    Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking;
  32    Part 5: Transport Protocols; Sub-part 1: Basic Transport Protocol
  33
  34    ETSI TS 102 636-4-1 V1.1.1 (2011-06)
  35    Intelligent Transport Systems (ITS); Vehicular communications; GeoNetworking;
  36    Part 4: Geographical addressing and forwarding for point-to-point and point-to-multipoint communications;
  37    Sub-part 1: Media-Independent Functionality
  38 */
  39
  40 #define GEONET_ADDR_LEN 8
  41
  42 static const struct tok msg_type_values[] = {
  43         {   0, "CAM" },
  44         {   1, "DENM" },
  45         { 101, "TPEGM" },
  46         { 102, "TSPDM" },
  47         { 103, "VPM" },
  48         { 104, "SRM" },
  49         { 105, "SLAM" },
  50         { 106, "ecoCAM" },
  51         { 107, "ITM" },
  52         { 150, "SA" },
  53         {   0, NULL }
  54 };
  55
  56 static void
  57 print_btp_body(netdissect_options *ndo,
  58                const u_char *bp)
  59 {
  60         int version;
  61         int msg_type;
  62         const char *msg_type_str;
  63
  64         /* Assuming ItsDpuHeader */
  65         version = bp[0];
  66         msg_type = bp[1];
  67         msg_type_str = tok2str(msg_type_values, "unknown (%u)", msg_type);
  68
  69         ND_PRINT((ndo, "; ItsPduHeader v:%d t:%d-%s", version, msg_type, msg_type_str));
  70 }
  71
  72 static void
  73 print_btp(netdissect_options *ndo,
  74           const u_char *bp)
  75 {
  76         uint16_t dest = EXTRACT_16BITS(bp+0);
  77         uint16_t src = EXTRACT_16BITS(bp+2);
  78         ND_PRINT((ndo, "; BTP Dst:%u Src:%u", dest, src));
  79 }
  80
  81 static int
  82 print_long_pos_vector(netdissect_options *ndo,
  83                       const u_char *bp)
  84 {
  85         uint32_t lat, lon;
  86
  87         ND_PRINT((ndo, "GN_ADDR:%s ", linkaddr_string (ndo, bp, 0, GEONET_ADDR_LEN)));
  88
  89         if (!ND_TTEST2(*(bp+12), 8))
  90                 return (-1);
  91         lat = EXTRACT_32BITS(bp+12);
  92         ND_PRINT((ndo, "lat:%d ", lat));
  93         lon = EXTRACT_32BITS(bp+16);
  94         ND_PRINT((ndo, "lon:%d", lon));
  95         return (0);
  96 }
  97
  98
  99 /*
 100  * This is the top level routine of the printer.  'p' points
 101  * to the geonet header of the packet.
 102  */
 103 void
 104 geonet_print(netdissect_options *ndo, const u_char *eth, const u_char *bp, u_int length)
 105 {
 106         int version;
 107         int next_hdr;
 108         int hdr_type;
 109         int hdr_subtype;
 110         uint16_t payload_length;
 111         int hop_limit;
 112         const char *next_hdr_txt = "Unknown";
 113         const char *hdr_type_txt = "Unknown";
 114         int hdr_size = -1;
 115
 116         ND_PRINT((ndo, "GeoNet src:%s; ", etheraddr_string(ndo, eth+6)));
 117
 118         /* Process Common Header */
 119         if (length < 36)
 120                 goto malformed;
 121
 122         ND_TCHECK2(*bp, 7);
 123         version = bp[0] >> 4;
 124         next_hdr = bp[0] & 0x0f;
 125         hdr_type = bp[1] >> 4;
 126         hdr_subtype = bp[1] & 0x0f;
 127         payload_length = EXTRACT_16BITS(bp+4);
 128         hop_limit = bp[7];
 129
 130         switch (next_hdr) {
 131                 case 0: next_hdr_txt = "Any"; break;
 132                 case 1: next_hdr_txt = "BTP-A"; break;
 133                 case 2: next_hdr_txt = "BTP-B"; break;
 134                 case 3: next_hdr_txt = "IPv6"; break;
 135         }
 136
 137         switch (hdr_type) {
 138                 case 0: hdr_type_txt = "Any"; break;
 139                 case 1: hdr_type_txt = "Beacon"; break;
 140                 case 2: hdr_type_txt = "GeoUnicast"; break;
 141                 case 3: switch (hdr_subtype) {
 142                                 case 0: hdr_type_txt = "GeoAnycastCircle"; break;
 143                                 case 1: hdr_type_txt = "GeoAnycastRect"; break;
 144                                 case 2: hdr_type_txt = "GeoAnycastElipse"; break;
 145                         }
 146                         break;
 147                 case 4: switch (hdr_subtype) {
 148                                 case 0: hdr_type_txt = "GeoBroadcastCircle"; break;
 149                                 case 1: hdr_type_txt = "GeoBroadcastRect"; break;
 150                                 case 2: hdr_type_txt = "GeoBroadcastElipse"; break;
 151                         }
 152                         break;
 153                 case 5: switch (hdr_subtype) {
 154                                 case 0: hdr_type_txt = "TopoScopeBcast-SH"; break;
 155                                 case 1: hdr_type_txt = "TopoScopeBcast-MH"; break;
 156                         }
 157                         break;
 158                 case 6: switch (hdr_subtype) {
 159                                 case 0: hdr_type_txt = "LocService-Request"; break;
 160                                 case 1: hdr_type_txt = "LocService-Reply"; break;
 161                         }
 162                         break;
 163         }
 164
 165         ND_PRINT((ndo, "v:%d ", version));
 166         ND_PRINT((ndo, "NH:%d-%s ", next_hdr, next_hdr_txt));
 167         ND_PRINT((ndo, "HT:%d-%d-%s ", hdr_type, hdr_subtype, hdr_type_txt));
 168         ND_PRINT((ndo, "HopLim:%d ", hop_limit));
 169         ND_PRINT((ndo, "Payload:%d ", payload_length));
 170         if (print_long_pos_vector(ndo, bp + 8) == -1)
 171                 goto trunc;
 172
 173         /* Skip Common Header */
 174         length -= 36;
 175         bp += 36;
 176
 177         /* Process Extended Headers */
 178         switch (hdr_type) {
 179                 case 0: /* Any */
 180                         hdr_size = 0;
 181                         break;
 182                 case 1: /* Beacon */
 183                         hdr_size = 0;
 184                         break;
 185                 case 2: /* GeoUnicast */
 186                         break;
 187                 case 3: switch (hdr_subtype) {
 188                                 case 0: /* GeoAnycastCircle */
 189                                         break;
 190                                 case 1: /* GeoAnycastRect */
 191                                         break;
 192                                 case 2: /* GeoAnycastElipse */
 193                                         break;
 194                         }
 195                         break;
 196                 case 4: switch (hdr_subtype) {
 197                                 case 0: /* GeoBroadcastCircle */
 198                                         break;
 199                                 case 1: /* GeoBroadcastRect */
 200                                         break;
 201                                 case 2: /* GeoBroadcastElipse */
 202                                         break;
 203                         }
 204                         break;
 205                 case 5: switch (hdr_subtype) {
 206                                 case 0: /* TopoScopeBcast-SH */
 207                                         hdr_size = 0;
 208                                         break;
 209                                 case 1: /* TopoScopeBcast-MH */
 210                                         hdr_size = 68 - 36;
 211                                         break;
 212                         }
 213                         break;
 214                 case 6: switch (hdr_subtype) {
 215                                 case 0: /* LocService-Request */
 216                                         break;
 217                                 case 1: /* LocService-Reply */
 218                                         break;
 219                         }
 220                         break;
 221         }
 222
 223         /* Skip Extended headers */
 224         if (hdr_size >= 0) {
 225                 if (length < (u_int)hdr_size)
 226                         goto malformed;
 227                 ND_TCHECK2(*bp, hdr_size);
 228                 length -= hdr_size;
 229                 bp += hdr_size;
 230                 switch (next_hdr) {
 231                         case 0: /* Any */
 232                                 break;
 233                         case 1:
 234                         case 2: /* BTP A/B */
 235                                 if (length < 4)
 236                                         goto malformed;
 237                                 ND_TCHECK2(*bp, 4);
 238                                 print_btp(ndo, bp);
 239                                 length -= 4;
 240                                 bp += 4;
 241                                 if (length >= 2) {
 242                                         /*
 243                                          * XXX - did print_btp_body()
 244                                          * return if length < 2
 245                                          * because this is optional,
 246                                          * or was that just not
 247                                          * reporting genuine errors?
 248                                          */
 249                                         ND_TCHECK2(*bp, 2);
 250                                         print_btp_body(ndo, bp);
 251                                 }
 252                                 break;
 253                         case 3: /* IPv6 */
 254                                 break;
 255                 }
 256         }
 257
 258         /* Print user data part */
 259         if (ndo->ndo_vflag)
 260                 ND_DEFAULTPRINT(bp, length);
 261         return;
 262
 263 malformed:
 264         ND_PRINT((ndo, " Malformed (small) "));
 265         /* XXX - print the remaining data as hex? */
 266         return;
 267
 268 trunc:
 269         ND_PRINT((ndo, "[|geonet]"));
 270 }
 271
 272
 273 /*
 274  * Local Variables:
 275  * c-style: whitesmith
 276  * c-basic-offset: 8
 277  * End:
 278  */