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