nexmon – Rev 1
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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)
*/
#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#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)
{
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;
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 *eth, const u_char *bp, u_int length)
{
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 src:%s; ", etheraddr_string(ndo, eth+6)));
/* Process Common Header */
if (length < 36)
goto malformed;
ND_TCHECK2(*bp, 7);
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 malformed;
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 malformed;
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;
malformed:
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:
*/