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-rw-r--r--print-geonet.c286
1 files changed, 286 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>
+
+#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)
+{
+ int version;
+ int msg_type;
+ const char *msg_type_str;
+
+ /* 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)
+{
+ uint16_t dest = EXTRACT_16BITS(bp+0);
+ uint16_t src = EXTRACT_16BITS(bp+2);
+ ND_PRINT((ndo, "; BTP Dst:%u Src:%u", dest, src));
+}
+
+static int
+print_long_pos_vector(netdissect_options *ndo,
+ const u_char *bp)
+{
+ uint32_t lat, lon;
+
+ if (!ND_TTEST2(*bp, GEONET_ADDR_LEN))
+ return (-1);
+ ND_PRINT((ndo, "GN_ADDR:%s ", linkaddr_string (ndo, bp, 0, GEONET_ADDR_LEN)));
+
+ if (!ND_TTEST2(*(bp+12), 8))
+ return (-1);
+ lat = EXTRACT_32BITS(bp+12);
+ ND_PRINT((ndo, "lat:%d ", lat));
+ lon = EXTRACT_32BITS(bp+16);
+ ND_PRINT((ndo, "lon:%d", lon));
+ return (0);
+}
+
+
+/*
+ * 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)
+{
+ int version;
+ int next_hdr;
+ int hdr_type;
+ int hdr_subtype;
+ uint16_t payload_length;
+ int hop_limit;
+ const char *next_hdr_txt = "Unknown";
+ const char *hdr_type_txt = "Unknown";
+ int hdr_size = -1;
+
+ ND_PRINT((ndo, "GeoNet "));
+ if (src != NULL)
+ ND_PRINT((ndo, "src:%s", (src->addr_string)(ndo, src->addr)));
+ ND_PRINT((ndo, "; "));
+
+ /* Process Common Header */
+ if (length < 36)
+ goto invalid;
+
+ ND_TCHECK2(*bp, 8);
+ version = bp[0] >> 4;
+ next_hdr = bp[0] & 0x0f;
+ hdr_type = bp[1] >> 4;
+ hdr_subtype = bp[1] & 0x0f;
+ payload_length = EXTRACT_16BITS(bp+4);
+ hop_limit = 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((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));
+ if (print_long_pos_vector(ndo, bp + 8) == -1)
+ goto trunc;
+
+ /* 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) {
+ if (length < (u_int)hdr_size)
+ goto invalid;
+ ND_TCHECK2(*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)
+ goto invalid;
+ ND_TCHECK2(*bp, 4);
+ 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?
+ */
+ ND_TCHECK2(*bp, 2);
+ 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((ndo, " Malformed (small) "));
+ /* XXX - print the remaining data as hex? */
+ return;
+
+trunc:
+ ND_PRINT((ndo, "[|geonet]"));
+}
+
+
+/*
+ * Local Variables:
+ * c-style: whitesmith
+ * c-basic-offset: 8
+ * End:
+ */
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-07 22:58:58 +0000