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1 /*
2 * Copyright (c) 1998-2007 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 Carles Kishimoto <carles.kishimoto@gmail.com>
16 */
17
18 /* \summary: Light Weight Access Point Protocol (LWAPP) printer */
19
20 /* specification: RFC 5412 */
21
22 #ifdef HAVE_CONFIG_H
23 #include <config.h>
24 #endif
25
26 #include "netdissect-stdinc.h"
27
28 #include "netdissect.h"
29 #include "extract.h"
30 #include "addrtoname.h"
31
32
33 /*
34 * LWAPP transport (common) header
35 * 0 1 2 3
36 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
37 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
38 * |VER| RID |C|F|L| Frag ID | Length |
39 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
40 * | Status/WLANs | Payload... |
41 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
42 *
43 */
44
45 struct lwapp_transport_header {
46 nd_uint8_t version;
47 nd_uint8_t frag_id;
48 nd_uint16_t length;
49 nd_uint16_t status;
50 };
51
52 /*
53 * LWAPP control header
54 * 0 1 2 3
55 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
56 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
57 * | Message Type | Seq Num | Msg Element Length |
58 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
59 * | Session ID |
60 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
61 * | Msg Element [0..N] |
62 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
63 */
64
65 struct lwapp_control_header {
66 nd_uint8_t msg_type;
67 nd_uint8_t seq_num;
68 nd_uint16_t len;
69 nd_uint32_t session_id;
70 };
71
72 #define LWAPP_VERSION 0
73 #define LWAPP_EXTRACT_VERSION(x) (((x)&0xC0)>>6)
74 #define LWAPP_EXTRACT_RID(x) (((x)&0x38)>>3)
75 #define LWAPP_EXTRACT_CONTROL_BIT(x) (((x)&0x04)>>2)
76
77 static const struct tok lwapp_header_bits_values[] = {
78 { 0x01, "Last Fragment Bit"},
79 { 0x02, "Fragment Bit"},
80 { 0x04, "Control Bit"},
81 { 0, NULL}
82 };
83
84 #define LWAPP_MSGTYPE_DISCOVERY_REQUEST 1
85 #define LWAPP_MSGTYPE_DISCOVERY_RESPONSE 2
86 #define LWAPP_MSGTYPE_JOIN_REQUEST 3
87 #define LWAPP_MSGTYPE_JOIN_RESPONSE 4
88 #define LWAPP_MSGTYPE_JOIN_ACK 5
89 #define LWAPP_MSGTYPE_JOIN_CONFIRM 6
90 #define LWAPP_MSGTYPE_CONFIGURE_REQUEST 10
91 #define LWAPP_MSGTYPE_CONFIGURE_RESPONSE 11
92 #define LWAPP_MSGTYPE_CONF_UPDATE_REQUEST 12
93 #define LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE 13
94 #define LWAPP_MSGTYPE_WTP_EVENT_REQUEST 14
95 #define LWAPP_MSGTYPE_WTP_EVENT_RESPONSE 15
96 #define LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST 16
97 #define LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE 17
98 #define LWAPP_MSGTYPE_ECHO_REQUEST 22
99 #define LWAPP_MSGTYPE_ECHO_RESPONSE 23
100 #define LWAPP_MSGTYPE_IMAGE_DATA_REQUEST 24
101 #define LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE 25
102 #define LWAPP_MSGTYPE_RESET_REQUEST 26
103 #define LWAPP_MSGTYPE_RESET_RESPONSE 27
104 #define LWAPP_MSGTYPE_KEY_UPDATE_REQUEST 30
105 #define LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE 31
106 #define LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST 32
107 #define LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE 33
108 #define LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST 34
109 #define LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE 35
110 #define LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION 36
111 #define LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST 37
112 #define LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE 38
113 #define LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST 39
114 #define LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE 40
115
116 static const struct tok lwapp_msg_type_values[] = {
117 { LWAPP_MSGTYPE_DISCOVERY_REQUEST, "Discovery req"},
118 { LWAPP_MSGTYPE_DISCOVERY_RESPONSE, "Discovery resp"},
119 { LWAPP_MSGTYPE_JOIN_REQUEST, "Join req"},
120 { LWAPP_MSGTYPE_JOIN_RESPONSE, "Join resp"},
121 { LWAPP_MSGTYPE_JOIN_ACK, "Join ack"},
122 { LWAPP_MSGTYPE_JOIN_CONFIRM, "Join confirm"},
123 { LWAPP_MSGTYPE_CONFIGURE_REQUEST, "Configure req"},
124 { LWAPP_MSGTYPE_CONFIGURE_RESPONSE, "Configure resp"},
125 { LWAPP_MSGTYPE_CONF_UPDATE_REQUEST, "Update req"},
126 { LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE, "Update resp"},
127 { LWAPP_MSGTYPE_WTP_EVENT_REQUEST, "WTP event req"},
128 { LWAPP_MSGTYPE_WTP_EVENT_RESPONSE, "WTP event resp"},
129 { LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST, "Change state event req"},
130 { LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE, "Change state event resp"},
131 { LWAPP_MSGTYPE_ECHO_REQUEST, "Echo req"},
132 { LWAPP_MSGTYPE_ECHO_RESPONSE, "Echo resp"},
133 { LWAPP_MSGTYPE_IMAGE_DATA_REQUEST, "Image data req"},
134 { LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE, "Image data resp"},
135 { LWAPP_MSGTYPE_RESET_REQUEST, "Channel status req"},
136 { LWAPP_MSGTYPE_RESET_RESPONSE, "Channel status resp"},
137 { LWAPP_MSGTYPE_KEY_UPDATE_REQUEST, "Key update req"},
138 { LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE, "Key update resp"},
139 { LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST, "Primary discovery req"},
140 { LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE, "Primary discovery resp"},
141 { LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST, "Data transfer req"},
142 { LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE, "Data transfer resp"},
143 { LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION, "Clear config ind"},
144 { LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST, "Wlan config req"},
145 { LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE, "Wlan config resp"},
146 { LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST, "Mobile config req"},
147 { LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE, "Mobile config resp"},
148 { 0, NULL}
149 };
150
151 /*
152 * LWAPP message elements
153 *
154 * 0 1 2 3
155 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
156 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
157 * | Type | Length | Value ... |
158 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
159 */
160 struct lwapp_message_header {
161 nd_uint8_t type;
162 nd_uint16_t length;
163 };
164
165 void
166 lwapp_control_print(netdissect_options *ndo,
167 const u_char *pptr, u_int len, int has_ap_ident)
168 {
169 const struct lwapp_transport_header *lwapp_trans_header;
170 const struct lwapp_control_header *lwapp_control_header;
171 const u_char *tptr;
172 uint8_t version;
173 u_int tlen;
174 u_int msg_type, msg_tlen;
175
176 ndo->ndo_protocol = "lwapp_control";
177 tptr=pptr;
178
179 if (has_ap_ident) {
180 /* check if enough bytes for AP identity */
181 ND_TCHECK_6(tptr);
182 lwapp_trans_header = (const struct lwapp_transport_header *)(pptr+6);
183 } else {
184 lwapp_trans_header = (const struct lwapp_transport_header *)pptr;
185 }
186 ND_TCHECK_SIZE(lwapp_trans_header);
187 version = EXTRACT_U_1(lwapp_trans_header->version);
188
189 /*
190 * Sanity checking of the header.
191 */
192 if (LWAPP_EXTRACT_VERSION(version) != LWAPP_VERSION) {
193 ND_PRINT("LWAPP version %u packet not supported",
194 LWAPP_EXTRACT_VERSION(version));
195 return;
196 }
197
198 /* non-verbose */
199 if (ndo->ndo_vflag < 1) {
200 ND_PRINT("LWAPPv%u, %s frame, Flags [%s], length %u",
201 LWAPP_EXTRACT_VERSION(version),
202 LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data",
203 bittok2str(lwapp_header_bits_values,"none",version&0x07),
204 len);
205 return;
206 }
207
208 /* ok they seem to want to know everything - lets fully decode it */
209 tlen=EXTRACT_BE_U_2(lwapp_trans_header->length);
210
211 ND_PRINT("LWAPPv%u, %s frame, Radio-id %u, Flags [%s], Frag-id %u, length %u",
212 LWAPP_EXTRACT_VERSION(version),
213 LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data",
214 LWAPP_EXTRACT_RID(version),
215 bittok2str(lwapp_header_bits_values,"none",version&0x07),
216 EXTRACT_U_1(lwapp_trans_header->frag_id),
217 tlen);
218
219 if (has_ap_ident) {
220 ND_PRINT("\n\tAP identity: %s", etheraddr_string(ndo, tptr));
221 tptr+=sizeof(struct lwapp_transport_header)+6;
222 } else {
223 tptr+=sizeof(struct lwapp_transport_header);
224 }
225
226 while(tlen!=0) {
227
228 /* did we capture enough for fully decoding the object header ? */
229 ND_TCHECK_LEN(tptr, sizeof(struct lwapp_control_header));
230 if (tlen < sizeof(struct lwapp_control_header)) {
231 ND_PRINT("\n\t Msg goes past end of PDU");
232 break;
233 }
234
235 lwapp_control_header = (const struct lwapp_control_header *)tptr;
236 msg_tlen = EXTRACT_BE_U_2(lwapp_control_header->len);
237 if (tlen < sizeof(struct lwapp_control_header) + msg_tlen) {
238 ND_PRINT("\n\t Msg goes past end of PDU");
239 break;
240 }
241
242 /* print message header */
243 msg_type = EXTRACT_U_1(lwapp_control_header->msg_type);
244 ND_PRINT("\n\t Msg type: %s (%u), Seqnum: %u, Msg len: %u, Session: 0x%08x",
245 tok2str(lwapp_msg_type_values,"Unknown",msg_type),
246 msg_type,
247 EXTRACT_U_1(lwapp_control_header->seq_num),
248 msg_tlen,
249 EXTRACT_BE_U_4(lwapp_control_header->session_id));
250
251 /* did we capture enough for fully decoding the message */
252 ND_TCHECK_LEN(tptr, msg_tlen);
253
254 /* XXX - Decode sub messages for each message */
255 switch(msg_type) {
256 case LWAPP_MSGTYPE_DISCOVERY_REQUEST:
257 case LWAPP_MSGTYPE_DISCOVERY_RESPONSE:
258 case LWAPP_MSGTYPE_JOIN_REQUEST:
259 case LWAPP_MSGTYPE_JOIN_RESPONSE:
260 case LWAPP_MSGTYPE_JOIN_ACK:
261 case LWAPP_MSGTYPE_JOIN_CONFIRM:
262 case LWAPP_MSGTYPE_CONFIGURE_REQUEST:
263 case LWAPP_MSGTYPE_CONFIGURE_RESPONSE:
264 case LWAPP_MSGTYPE_CONF_UPDATE_REQUEST:
265 case LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE:
266 case LWAPP_MSGTYPE_WTP_EVENT_REQUEST:
267 case LWAPP_MSGTYPE_WTP_EVENT_RESPONSE:
268 case LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST:
269 case LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE:
270 case LWAPP_MSGTYPE_ECHO_REQUEST:
271 case LWAPP_MSGTYPE_ECHO_RESPONSE:
272 case LWAPP_MSGTYPE_IMAGE_DATA_REQUEST:
273 case LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE:
274 case LWAPP_MSGTYPE_RESET_REQUEST:
275 case LWAPP_MSGTYPE_RESET_RESPONSE:
276 case LWAPP_MSGTYPE_KEY_UPDATE_REQUEST:
277 case LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE:
278 case LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST:
279 case LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE:
280 case LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST:
281 case LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE:
282 case LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION:
283 case LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST:
284 case LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE:
285 case LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST:
286 case LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE:
287 default:
288 break;
289 }
290
291 tptr += sizeof(struct lwapp_control_header) + msg_tlen;
292 tlen -= sizeof(struct lwapp_control_header) + msg_tlen;
293 }
294 return;
295
296 trunc:
297 nd_print_trunc(ndo);
298 }
299
300 void
301 lwapp_data_print(netdissect_options *ndo,
302 const u_char *pptr, u_int len)
303 {
304 const struct lwapp_transport_header *lwapp_trans_header;
305 const u_char *tptr;
306 u_int tlen;
307 u_int version;
308
309 ndo->ndo_protocol = "lwapp_data";
310 tptr=pptr;
311
312 /* check if enough bytes for AP identity */
313 ND_TCHECK_6(tptr);
314 lwapp_trans_header = (const struct lwapp_transport_header *)pptr;
315 ND_TCHECK_SIZE(lwapp_trans_header);
316 version = EXTRACT_U_1(lwapp_trans_header->version);
317
318 /*
319 * Sanity checking of the header.
320 */
321 if (LWAPP_EXTRACT_VERSION(version) != LWAPP_VERSION) {
322 ND_PRINT("LWAPP version %u packet not supported",
323 LWAPP_EXTRACT_VERSION(version));
324 return;
325 }
326
327 /* non-verbose */
328 if (ndo->ndo_vflag < 1) {
329 ND_PRINT("LWAPPv%u, %s frame, Flags [%s], length %u",
330 LWAPP_EXTRACT_VERSION(version),
331 LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data",
332 bittok2str(lwapp_header_bits_values,"none",version&0x07),
333 len);
334 return;
335 }
336
337 /* ok they seem to want to know everything - lets fully decode it */
338 tlen=EXTRACT_BE_U_2(lwapp_trans_header->length);
339 if (tlen < sizeof(struct lwapp_transport_header)) {
340 ND_PRINT("LWAPPv%u, %s frame, Radio-id %u, Flags [%s], length %u < transport header length",
341 LWAPP_EXTRACT_VERSION(version),
342 LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data",
343 LWAPP_EXTRACT_RID(version),
344 bittok2str(lwapp_header_bits_values,"none",version&0x07),
345 tlen);
346 return;
347 }
348
349 ND_PRINT("LWAPPv%u, %s frame, Radio-id %u, Flags [%s], Frag-id %u, length %u",
350 LWAPP_EXTRACT_VERSION(version),
351 LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data",
352 LWAPP_EXTRACT_RID(version),
353 bittok2str(lwapp_header_bits_values,"none",version&0x07),
354 EXTRACT_U_1(lwapp_trans_header->frag_id),
355 tlen);
356
357 tptr+=sizeof(struct lwapp_transport_header);
358 tlen-=sizeof(struct lwapp_transport_header);
359
360 /* FIX - An IEEE 802.11 frame follows - hexdump for now */
361 print_unknown_data(ndo, tptr, "\n\t", tlen);
362
363 return;
364
365 trunc:
366 nd_print_trunc(ndo);
367 }
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