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-rw-r--r--print-geonet.c267
1 files changed, 267 insertions, 0 deletions
diff --git a/print-geonet.c b/print-geonet.c
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+/*
+ * 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)
+ */
+
+/* \summary: ISO CALM FAST and ETSI GeoNetworking printer */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.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 msg_type;
+
+ /* Assuming ItsPduHeader */
+ ND_PRINT("; ItsPduHeader v:%u", GET_U_1(bp));
+
+ msg_type = GET_U_1(bp + 1);
+ ND_PRINT(" t:%u-%s", msg_type,
+ tok2str(msg_type_values, "unknown (%u)", msg_type));
+}
+
+/* EN 302 636-5-1 V2.2.1 Section 7.2: BTP-A header */
+static void
+print_btp(netdissect_options *ndo,
+ const u_char *bp)
+{
+ ND_PRINT("; BTP Dst:%u", GET_BE_U_2(bp + 0));
+ ND_PRINT(" Src:%u", GET_BE_U_2(bp + 2));
+}
+
+static void
+print_long_pos_vector(netdissect_options *ndo,
+ const u_char *bp)
+{
+ ND_PRINT("GN_ADDR:%s ", GET_LINKADDR_STRING(bp, LINKADDR_OTHER, GEONET_ADDR_LEN));
+ ND_PRINT("lat:%u ", GET_BE_U_4(bp + 12));
+ ND_PRINT("lon:%u", GET_BE_U_4(bp + 16));
+}
+
+
+/*
+ * 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 *bp, u_int length,
+ const struct lladdr_info *src)
+{
+ u_int version;
+ u_int next_hdr;
+ u_int hdr_type;
+ u_int hdr_subtype;
+ uint16_t payload_length;
+ u_int hop_limit;
+ const char *next_hdr_txt = "Unknown";
+ const char *hdr_type_txt = "Unknown";
+ int hdr_size = -1;
+
+ ndo->ndo_protocol = "geonet";
+ ND_PRINT("GeoNet ");
+ if (src != NULL)
+ ND_PRINT("src:%s", (src->addr_string)(ndo, src->addr));
+ ND_PRINT("; ");
+
+ /* Process Common Header */
+ if (length < 36) {
+ ND_PRINT(" (common header length %u < 36)", length);
+ goto invalid;
+ }
+
+ version = GET_U_1(bp) >> 4;
+ next_hdr = GET_U_1(bp) & 0x0f;
+ hdr_type = GET_U_1(bp + 1) >> 4;
+ hdr_subtype = GET_U_1(bp + 1) & 0x0f;
+ payload_length = GET_BE_U_2(bp + 4);
+ hop_limit = GET_U_1(bp + 7);
+
+ 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("v:%u ", version);
+ ND_PRINT("NH:%u-%s ", next_hdr, next_hdr_txt);
+ ND_PRINT("HT:%u-%u-%s ", hdr_type, hdr_subtype, hdr_type_txt);
+ ND_PRINT("HopLim:%u ", hop_limit);
+ ND_PRINT("Payload:%u ", payload_length);
+ print_long_pos_vector(ndo, bp + 8);
+
+ /* Skip Common Header */
+ ND_TCHECK_LEN(bp, 36);
+ 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) {
+ if (length < (u_int)hdr_size) {
+ ND_PRINT(" (header size %d > %u)", hdr_size, length);
+ goto invalid;
+ }
+ ND_TCHECK_LEN(bp, hdr_size);
+ length -= hdr_size;
+ bp += hdr_size;
+ switch (next_hdr) {
+ case 0: /* Any */
+ break;
+ case 1:
+ case 2: /* BTP A/B */
+ if (length < 4) {
+ ND_PRINT(" (BTP length %u < 4)", length);
+ goto invalid;
+ }
+ print_btp(ndo, bp);
+ length -= 4;
+ bp += 4;
+ if (length >= 2) {
+ /*
+ * XXX - did print_btp_body()
+ * return if length < 2
+ * because this is optional,
+ * or was that just not
+ * reporting genuine errors?
+ */
+ print_btp_body(ndo, bp);
+ }
+ break;
+ case 3: /* IPv6 */
+ break;
+ }
+ }
+
+ /* Print user data part */
+ if (ndo->ndo_vflag)
+ ND_DEFAULTPRINT(bp, length);
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
+ /* XXX - print the remaining data as hex? */
+}
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