/* * Copyright (c) 2013 The TCPDUMP project * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code * distributions retain the above copyright notice and this paragraph * in its entirety, and (2) distributions including binary code include * the above copyright notice and this paragraph in its entirety in * the documentation or other materials provided with the distribution. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE. * * Original code by Ola Martin Lykkja (ola.lykkja@q-free.com) */ #define NETDISSECT_REWORKED #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include "interface.h" #include "extract.h" #include "addrtoname.h" /* ETSI TS 102 636-5-1 V1.1.1 (2011-02) Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking; Part 5: Transport Protocols; Sub-part 1: Basic Transport Protocol ETSI TS 102 636-4-1 V1.1.1 (2011-06) Intelligent Transport Systems (ITS); Vehicular communications; GeoNetworking; Part 4: Geographical addressing and forwarding for point-to-point and point-to-multipoint communications; Sub-part 1: Media-Independent Functionality */ #define GEONET_ADDR_LEN 8 static const struct tok msg_type_values[] = { { 0, "CAM" }, { 1, "DENM" }, { 101, "TPEGM" }, { 102, "TSPDM" }, { 103, "VPM" }, { 104, "SRM" }, { 105, "SLAM" }, { 106, "ecoCAM" }, { 107, "ITM" }, { 150, "SA" }, { 0, NULL } }; static void print_btp_body(netdissect_options *ndo, const u_char *bp, u_int length) { int version; int msg_type; const char *msg_type_str; if (length <= 2) { return; } /* Assuming ItsDpuHeader */ version = bp[0]; msg_type = bp[1]; msg_type_str = tok2str(msg_type_values, "unknown (%u)", msg_type); ND_PRINT((ndo, "; ItsPduHeader v:%d t:%d-%s", version, msg_type, msg_type_str)); } static void print_btp(netdissect_options *ndo, const u_char *bp) { u_int16_t dest = EXTRACT_16BITS(bp+0); u_int16_t src = EXTRACT_16BITS(bp+2); ND_PRINT((ndo, "; BTP Dst:%u Src:%u", dest, src)); } static void print_long_pos_vector(netdissect_options *ndo, const u_char *bp) { u_int32_t lat, lon; ND_PRINT((ndo, "GN_ADDR:%s ", linkaddr_string (bp, 0, GEONET_ADDR_LEN))); lat = EXTRACT_32BITS(bp+12); ND_PRINT((ndo, "lat:%d ", lat)); lon = EXTRACT_32BITS(bp+16); ND_PRINT((ndo, "lon:%d", lon)); } /* * This is the top level routine of the printer. 'p' points * to the geonet header of the packet. */ void geonet_print(netdissect_options *ndo, const u_char *eth, const u_char *bp, u_int length) { ND_PRINT((ndo, "GeoNet src:%s; ", etheraddr_string(eth+6))); if (length >= 36) { /* Process Common Header */ int version = bp[0] >> 4; int next_hdr = bp[0] & 0x0f; int hdr_type = bp[1] >> 4; int hdr_subtype = bp[1] & 0x0f; u_int16_t payload_length = EXTRACT_16BITS(bp+4); int hop_limit = bp[7]; const char *next_hdr_txt = "Unknown"; const char *hdr_type_txt = "Unknown"; int hdr_size = -1; switch (next_hdr) { case 0: next_hdr_txt = "Any"; break; case 1: next_hdr_txt = "BTP-A"; break; case 2: next_hdr_txt = "BTP-B"; break; case 3: next_hdr_txt = "IPv6"; break; } switch (hdr_type) { case 0: hdr_type_txt = "Any"; break; case 1: hdr_type_txt = "Beacon"; break; case 2: hdr_type_txt = "GeoUnicast"; break; case 3: switch (hdr_subtype) { case 0: hdr_type_txt = "GeoAnycastCircle"; break; case 1: hdr_type_txt = "GeoAnycastRect"; break; case 2: hdr_type_txt = "GeoAnycastElipse"; break; } break; case 4: switch (hdr_subtype) { case 0: hdr_type_txt = "GeoBroadcastCircle"; break; case 1: hdr_type_txt = "GeoBroadcastRect"; break; case 2: hdr_type_txt = "GeoBroadcastElipse"; break; } break; case 5: switch (hdr_subtype) { case 0: hdr_type_txt = "TopoScopeBcast-SH"; break; case 1: hdr_type_txt = "TopoScopeBcast-MH"; break; } break; case 6: switch (hdr_subtype) { case 0: hdr_type_txt = "LocService-Request"; break; case 1: hdr_type_txt = "LocService-Reply"; break; } break; } ND_PRINT((ndo, "v:%d ", version)); ND_PRINT((ndo, "NH:%d-%s ", next_hdr, next_hdr_txt)); ND_PRINT((ndo, "HT:%d-%d-%s ", hdr_type, hdr_subtype, hdr_type_txt)); ND_PRINT((ndo, "HopLim:%d ", hop_limit)); ND_PRINT((ndo, "Payload:%d ", payload_length)); print_long_pos_vector(ndo, bp + 8); /* Skip Common Header */ length -= 36; bp += 36; /* Process Extended Headers */ switch (hdr_type) { case 0: /* Any */ hdr_size = 0; break; case 1: /* Beacon */ hdr_size = 0; break; case 2: /* GeoUnicast */ break; case 3: switch (hdr_subtype) { case 0: /* GeoAnycastCircle */ break; case 1: /* GeoAnycastRect */ break; case 2: /* GeoAnycastElipse */ break; } break; case 4: switch (hdr_subtype) { case 0: /* GeoBroadcastCircle */ break; case 1: /* GeoBroadcastRect */ break; case 2: /* GeoBroadcastElipse */ break; } break; case 5: switch (hdr_subtype) { case 0: /* TopoScopeBcast-SH */ hdr_size = 0; break; case 1: /* TopoScopeBcast-MH */ hdr_size = 68 - 36; break; } break; case 6: switch (hdr_subtype) { case 0: /* LocService-Request */ break; case 1: /* LocService-Reply */ break; } break; } /* Skip Extended headers */ if (hdr_size >= 0) { length -= hdr_size; bp += hdr_size; switch (next_hdr) { case 0: /* Any */ break; case 1: case 2: /* BTP A/B */ print_btp(ndo, bp); length -= 4; bp += 4; print_btp_body(ndo, bp, length); break; case 3: /* IPv6 */ break; } } } else { ND_PRINT((ndo, "Malformed (small) ")); } /* Print user data part */ if (ndo->ndo_vflag) ndo->ndo_default_print(ndo, bp, length); } /* * Local Variables: * c-style: whitesmith * c-basic-offset: 8 * End: */