print-geonet.c revision 313537 
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/* \summary: ISO CALM FAST and ETSI GeoNetworking printer */
19
20#ifdef HAVE_CONFIG_H
21#include "config.h"
22#endif
23
24#include <netdissect-stdinc.h>
25
26#include "netdissect.h"
27#include "extract.h"
28#include "addrtoname.h"
29
30
31/*
32   ETSI TS 102 636-5-1 V1.1.1 (2011-02)
33   Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking;
34   Part 5: Transport Protocols; Sub-part 1: Basic Transport Protocol
35
36   ETSI TS 102 636-4-1 V1.1.1 (2011-06)
37   Intelligent Transport Systems (ITS); Vehicular communications; GeoNetworking;
38   Part 4: Geographical addressing and forwarding for point-to-point and point-to-multipoint communications;
39   Sub-part 1: Media-Independent Functionality
40*/
41
42#define GEONET_ADDR_LEN 8
43
44static const struct tok msg_type_values[] = {
45	{   0, "CAM" },
46	{   1, "DENM" },
47	{ 101, "TPEGM" },
48	{ 102, "TSPDM" },
49	{ 103, "VPM" },
50	{ 104, "SRM" },
51	{ 105, "SLAM" },
52	{ 106, "ecoCAM" },
53	{ 107, "ITM" },
54	{ 150, "SA" },
55	{   0, NULL }
56};
57
58static void
59print_btp_body(netdissect_options *ndo,
60               const u_char *bp)
61{
62	int version;
63	int msg_type;
64	const char *msg_type_str;
65
66	/* Assuming ItsDpuHeader */
67	version = bp[0];
68	msg_type = bp[1];
69	msg_type_str = tok2str(msg_type_values, "unknown (%u)", msg_type);
70
71	ND_PRINT((ndo, "; ItsPduHeader v:%d t:%d-%s", version, msg_type, msg_type_str));
72}
73
74static void
75print_btp(netdissect_options *ndo,
76          const u_char *bp)
77{
78	uint16_t dest = EXTRACT_16BITS(bp+0);
79	uint16_t src = EXTRACT_16BITS(bp+2);
80	ND_PRINT((ndo, "; BTP Dst:%u Src:%u", dest, src));
81}
82
83static int
84print_long_pos_vector(netdissect_options *ndo,
85                      const u_char *bp)
86{
87	uint32_t lat, lon;
88
89	if (!ND_TTEST2(*bp, GEONET_ADDR_LEN))
90		return (-1);
91	ND_PRINT((ndo, "GN_ADDR:%s ", linkaddr_string (ndo, bp, 0, GEONET_ADDR_LEN)));
92
93	if (!ND_TTEST2(*(bp+12), 8))
94		return (-1);
95	lat = EXTRACT_32BITS(bp+12);
96	ND_PRINT((ndo, "lat:%d ", lat));
97	lon = EXTRACT_32BITS(bp+16);
98	ND_PRINT((ndo, "lon:%d", lon));
99	return (0);
100}
101
102
103/*
104 * This is the top level routine of the printer.  'p' points
105 * to the geonet header of the packet.
106 */
107void
108geonet_print(netdissect_options *ndo, const u_char *bp, u_int length,
109	     const struct lladdr_info *src)
110{
111	int version;
112	int next_hdr;
113	int hdr_type;
114	int hdr_subtype;
115	uint16_t payload_length;
116	int hop_limit;
117	const char *next_hdr_txt = "Unknown";
118	const char *hdr_type_txt = "Unknown";
119	int hdr_size = -1;
120
121	ND_PRINT((ndo, "GeoNet "));
122	if (src != NULL)
123		ND_PRINT((ndo, "src:%s", (src->addr_string)(ndo, src->addr)));
124	ND_PRINT((ndo, "; "));
125
126	/* Process Common Header */
127	if (length < 36)
128		goto invalid;
129
130	ND_TCHECK2(*bp, 8);
131	version = bp[0] >> 4;
132	next_hdr = bp[0] & 0x0f;
133	hdr_type = bp[1] >> 4;
134	hdr_subtype = bp[1] & 0x0f;
135	payload_length = EXTRACT_16BITS(bp+4);
136	hop_limit = bp[7];
137
138	switch (next_hdr) {
139		case 0: next_hdr_txt = "Any"; break;
140		case 1: next_hdr_txt = "BTP-A"; break;
141		case 2: next_hdr_txt = "BTP-B"; break;
142		case 3: next_hdr_txt = "IPv6"; break;
143	}
144
145	switch (hdr_type) {
146		case 0: hdr_type_txt = "Any"; break;
147		case 1: hdr_type_txt = "Beacon"; break;
148		case 2: hdr_type_txt = "GeoUnicast"; break;
149		case 3: switch (hdr_subtype) {
150				case 0: hdr_type_txt = "GeoAnycastCircle"; break;
151				case 1: hdr_type_txt = "GeoAnycastRect"; break;
152				case 2: hdr_type_txt = "GeoAnycastElipse"; break;
153			}
154			break;
155		case 4: switch (hdr_subtype) {
156				case 0: hdr_type_txt = "GeoBroadcastCircle"; break;
157				case 1: hdr_type_txt = "GeoBroadcastRect"; break;
158				case 2: hdr_type_txt = "GeoBroadcastElipse"; break;
159			}
160			break;
161		case 5: switch (hdr_subtype) {
162				case 0: hdr_type_txt = "TopoScopeBcast-SH"; break;
163				case 1: hdr_type_txt = "TopoScopeBcast-MH"; break;
164			}
165			break;
166		case 6: switch (hdr_subtype) {
167				case 0: hdr_type_txt = "LocService-Request"; break;
168				case 1: hdr_type_txt = "LocService-Reply"; break;
169			}
170			break;
171	}
172
173	ND_PRINT((ndo, "v:%d ", version));
174	ND_PRINT((ndo, "NH:%d-%s ", next_hdr, next_hdr_txt));
175	ND_PRINT((ndo, "HT:%d-%d-%s ", hdr_type, hdr_subtype, hdr_type_txt));
176	ND_PRINT((ndo, "HopLim:%d ", hop_limit));
177	ND_PRINT((ndo, "Payload:%d ", payload_length));
178	if (print_long_pos_vector(ndo, bp + 8) == -1)
179		goto trunc;
180
181	/* Skip Common Header */
182	length -= 36;
183	bp += 36;
184
185	/* Process Extended Headers */
186	switch (hdr_type) {
187		case 0: /* Any */
188			hdr_size = 0;
189			break;
190		case 1: /* Beacon */
191			hdr_size = 0;
192			break;
193		case 2: /* GeoUnicast */
194			break;
195		case 3: switch (hdr_subtype) {
196				case 0: /* GeoAnycastCircle */
197					break;
198				case 1: /* GeoAnycastRect */
199					break;
200				case 2: /* GeoAnycastElipse */
201					break;
202			}
203			break;
204		case 4: switch (hdr_subtype) {
205				case 0: /* GeoBroadcastCircle */
206					break;
207				case 1: /* GeoBroadcastRect */
208					break;
209				case 2: /* GeoBroadcastElipse */
210					break;
211			}
212			break;
213		case 5: switch (hdr_subtype) {
214				case 0: /* TopoScopeBcast-SH */
215					hdr_size = 0;
216					break;
217				case 1: /* TopoScopeBcast-MH */
218					hdr_size = 68 - 36;
219					break;
220			}
221			break;
222		case 6: switch (hdr_subtype) {
223				case 0: /* LocService-Request */
224					break;
225				case 1: /* LocService-Reply */
226					break;
227			}
228			break;
229	}
230
231	/* Skip Extended headers */
232	if (hdr_size >= 0) {
233		if (length < (u_int)hdr_size)
234			goto invalid;
235		ND_TCHECK2(*bp, hdr_size);
236		length -= hdr_size;
237		bp += hdr_size;
238		switch (next_hdr) {
239			case 0: /* Any */
240				break;
241			case 1:
242			case 2: /* BTP A/B */
243				if (length < 4)
244					goto invalid;
245				ND_TCHECK2(*bp, 4);
246				print_btp(ndo, bp);
247				length -= 4;
248				bp += 4;
249				if (length >= 2) {
250					/*
251					 * XXX - did print_btp_body()
252					 * return if length < 2
253					 * because this is optional,
254					 * or was that just not
255					 * reporting genuine errors?
256					 */
257					ND_TCHECK2(*bp, 2);
258					print_btp_body(ndo, bp);
259				}
260				break;
261			case 3: /* IPv6 */
262				break;
263		}
264	}
265
266	/* Print user data part */
267	if (ndo->ndo_vflag)
268		ND_DEFAULTPRINT(bp, length);
269	return;
270
271invalid:
272	ND_PRINT((ndo, " Malformed (small) "));
273	/* XXX - print the remaining data as hex? */
274	return;
275
276trunc:
277	ND_PRINT((ndo, "[|geonet]"));
278}
279
280
281/*
282 * Local Variables:
283 * c-style: whitesmith
284 * c-basic-offset: 8
285 * End:
286 */
287