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
44 static 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
58 static void
print_btp_body(netdissect_options * ndo,const u_char * bp)59 print_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
74 static void
print_btp(netdissect_options * ndo,const u_char * bp)75 print_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
83 static int
print_long_pos_vector(netdissect_options * ndo,const u_char * bp)84 print_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 */
107 void
geonet_print(netdissect_options * ndo,const u_char * bp,u_int length,const struct lladdr_info * src)108 geonet_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
271 invalid:
272 ND_PRINT((ndo, " Malformed (small) "));
273 /* XXX - print the remaining data as hex? */
274 return;
275
276 trunc:
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