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1 office 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 * Support for the Light Weight Access Point Protocol as per RFC 5412
16 *
17 * Original code by Carles Kishimoto <carles.kishimoto@gmail.com>
18 */
19  
20 #define NETDISSECT_REWORKED
21 #ifdef HAVE_CONFIG_H
22 #include "config.h"
23 #endif
24  
25 #include <tcpdump-stdinc.h>
26  
27 #include "interface.h"
28 #include "extract.h"
29 #include "addrtoname.h"
30  
31 /*
32 * LWAPP transport (common) header
33 * 0 1 2 3
34 * 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
35 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
36 * |VER| RID |C|F|L| Frag ID | Length |
37 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
38 * | Status/WLANs | Payload... |
39 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
40 *
41 */
42  
43 struct lwapp_transport_header {
44 uint8_t version;
45 uint8_t frag_id;
46 uint8_t length[2];
47 uint16_t status;
48 };
49  
50 /*
51 * LWAPP control header
52 * 0 1 2 3
53 * 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
54 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
55 * | Message Type | Seq Num | Msg Element Length |
56 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
57 * | Session ID |
58 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
59 * | Msg Element [0..N] |
60 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
61 */
62  
63 struct lwapp_control_header {
64 uint8_t msg_type;
65 uint8_t seq_num;
66 uint8_t len[2];
67 uint8_t session_id[4];
68 };
69  
70 #define LWAPP_VERSION 0
71 #define LWAPP_EXTRACT_VERSION(x) (((x)&0xC0)>>6)
72 #define LWAPP_EXTRACT_RID(x) (((x)&0x38)>>3)
73 #define LWAPP_EXTRACT_CONTROL_BIT(x) (((x)&0x04)>>2)
74  
75 static const struct tok lwapp_header_bits_values[] = {
76 { 0x01, "Last Fragment Bit"},
77 { 0x02, "Fragment Bit"},
78 { 0x04, "Control Bit"},
79 { 0, NULL}
80 };
81  
82 #define LWAPP_MSGTYPE_DISCOVERY_REQUEST 1
83 #define LWAPP_MSGTYPE_DISCOVERY_RESPONSE 2
84 #define LWAPP_MSGTYPE_JOIN_REQUEST 3
85 #define LWAPP_MSGTYPE_JOIN_RESPONSE 4
86 #define LWAPP_MSGTYPE_JOIN_ACK 5
87 #define LWAPP_MSGTYPE_JOIN_CONFIRM 6
88 #define LWAPP_MSGTYPE_CONFIGURE_REQUEST 10
89 #define LWAPP_MSGTYPE_CONFIGURE_RESPONSE 11
90 #define LWAPP_MSGTYPE_CONF_UPDATE_REQUEST 12
91 #define LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE 13
92 #define LWAPP_MSGTYPE_WTP_EVENT_REQUEST 14
93 #define LWAPP_MSGTYPE_WTP_EVENT_RESPONSE 15
94 #define LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST 16
95 #define LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE 17
96 #define LWAPP_MSGTYPE_ECHO_REQUEST 22
97 #define LWAPP_MSGTYPE_ECHO_RESPONSE 23
98 #define LWAPP_MSGTYPE_IMAGE_DATA_REQUEST 24
99 #define LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE 25
100 #define LWAPP_MSGTYPE_RESET_REQUEST 26
101 #define LWAPP_MSGTYPE_RESET_RESPONSE 27
102 #define LWAPP_MSGTYPE_KEY_UPDATE_REQUEST 30
103 #define LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE 31
104 #define LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST 32
105 #define LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE 33
106 #define LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST 34
107 #define LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE 35
108 #define LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION 36
109 #define LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST 37
110 #define LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE 38
111 #define LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST 39
112 #define LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE 40
113  
114 static const struct tok lwapp_msg_type_values[] = {
115 { LWAPP_MSGTYPE_DISCOVERY_REQUEST, "Discovery req"},
116 { LWAPP_MSGTYPE_DISCOVERY_RESPONSE, "Discovery resp"},
117 { LWAPP_MSGTYPE_JOIN_REQUEST, "Join req"},
118 { LWAPP_MSGTYPE_JOIN_RESPONSE, "Join resp"},
119 { LWAPP_MSGTYPE_JOIN_ACK, "Join ack"},
120 { LWAPP_MSGTYPE_JOIN_CONFIRM, "Join confirm"},
121 { LWAPP_MSGTYPE_CONFIGURE_REQUEST, "Configure req"},
122 { LWAPP_MSGTYPE_CONFIGURE_RESPONSE, "Configure resp"},
123 { LWAPP_MSGTYPE_CONF_UPDATE_REQUEST, "Update req"},
124 { LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE, "Update resp"},
125 { LWAPP_MSGTYPE_WTP_EVENT_REQUEST, "WTP event req"},
126 { LWAPP_MSGTYPE_WTP_EVENT_RESPONSE, "WTP event resp"},
127 { LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST, "Change state event req"},
128 { LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE, "Change state event resp"},
129 { LWAPP_MSGTYPE_ECHO_REQUEST, "Echo req"},
130 { LWAPP_MSGTYPE_ECHO_RESPONSE, "Echo resp"},
131 { LWAPP_MSGTYPE_IMAGE_DATA_REQUEST, "Image data req"},
132 { LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE, "Image data resp"},
133 { LWAPP_MSGTYPE_RESET_REQUEST, "Channel status req"},
134 { LWAPP_MSGTYPE_RESET_RESPONSE, "Channel status resp"},
135 { LWAPP_MSGTYPE_KEY_UPDATE_REQUEST, "Key update req"},
136 { LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE, "Key update resp"},
137 { LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST, "Primary discovery req"},
138 { LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE, "Primary discovery resp"},
139 { LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST, "Data transfer req"},
140 { LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE, "Data transfer resp"},
141 { LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION, "Clear config ind"},
142 { LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST, "Wlan config req"},
143 { LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE, "Wlan config resp"},
144 { LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST, "Mobile config req"},
145 { LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE, "Mobile config resp"},
146 { 0, NULL}
147 };
148  
149 /*
150 * LWAPP message elements
151 *
152 * 0 1 2 3
153 * 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
154 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
155 * | Type | Length | Value ... |
156 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
157 */
158 struct lwapp_message_header {
159 uint8_t type;
160 uint8_t length[2];
161 };
162  
163 void
164 lwapp_control_print(netdissect_options *ndo,
165 const u_char *pptr, u_int len, int has_ap_ident)
166 {
167 const struct lwapp_transport_header *lwapp_trans_header;
168 const struct lwapp_control_header *lwapp_control_header;
169 const u_char *tptr;
170 int tlen;
171 int msg_tlen;
172  
173 tptr=pptr;
174  
175 if (has_ap_ident) {
176 /* check if enough bytes for AP identity */
177 ND_TCHECK2(*tptr, 6);
178 lwapp_trans_header = (const struct lwapp_transport_header *)(pptr+6);
179 } else {
180 lwapp_trans_header = (const struct lwapp_transport_header *)pptr;
181 }
182 ND_TCHECK(*lwapp_trans_header);
183  
184 /*
185 * Sanity checking of the header.
186 */
187 if (LWAPP_EXTRACT_VERSION(lwapp_trans_header->version) != LWAPP_VERSION) {
188 ND_PRINT((ndo, "LWAPP version %u packet not supported",
189 LWAPP_EXTRACT_VERSION(lwapp_trans_header->version)));
190 return;
191 }
192  
193 /* non-verbose */
194 if (ndo->ndo_vflag < 1) {
195 ND_PRINT((ndo, "LWAPPv%u, %s frame, Flags [%s], length %u",
196 LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
197 LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
198 bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
199 len));
200 return;
201 }
202  
203 /* ok they seem to want to know everything - lets fully decode it */
204 tlen=EXTRACT_16BITS(lwapp_trans_header->length);
205  
206 ND_PRINT((ndo, "LWAPPv%u, %s frame, Radio-id %u, Flags [%s], Frag-id %u, length %u",
207 LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
208 LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
209 LWAPP_EXTRACT_RID(lwapp_trans_header->version),
210 bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
211 lwapp_trans_header->frag_id,
212 tlen));
213  
214 if (has_ap_ident) {
215 ND_PRINT((ndo, "\n\tAP identity: %s", etheraddr_string(ndo, tptr)));
216 tptr+=sizeof(const struct lwapp_transport_header)+6;
217 } else {
218 tptr+=sizeof(const struct lwapp_transport_header);
219 }
220  
221 while(tlen>0) {
222  
223 /* did we capture enough for fully decoding the object header ? */
224 ND_TCHECK2(*tptr, sizeof(struct lwapp_control_header));
225  
226 lwapp_control_header = (const struct lwapp_control_header *)tptr;
227 msg_tlen = EXTRACT_16BITS(lwapp_control_header->len);
228  
229 /* print message header */
230 ND_PRINT((ndo, "\n\t Msg type: %s (%u), Seqnum: %u, Msg len: %d, Session: 0x%08x",
231 tok2str(lwapp_msg_type_values,"Unknown",lwapp_control_header->msg_type),
232 lwapp_control_header->msg_type,
233 lwapp_control_header->seq_num,
234 msg_tlen,
235 EXTRACT_32BITS(lwapp_control_header->session_id)));
236  
237 /* did we capture enough for fully decoding the message */
238 ND_TCHECK2(*tptr, msg_tlen);
239  
240 /* XXX - Decode sub messages for each message */
241 switch(lwapp_control_header->msg_type) {
242 case LWAPP_MSGTYPE_DISCOVERY_REQUEST:
243 case LWAPP_MSGTYPE_DISCOVERY_RESPONSE:
244 case LWAPP_MSGTYPE_JOIN_REQUEST:
245 case LWAPP_MSGTYPE_JOIN_RESPONSE:
246 case LWAPP_MSGTYPE_JOIN_ACK:
247 case LWAPP_MSGTYPE_JOIN_CONFIRM:
248 case LWAPP_MSGTYPE_CONFIGURE_REQUEST:
249 case LWAPP_MSGTYPE_CONFIGURE_RESPONSE:
250 case LWAPP_MSGTYPE_CONF_UPDATE_REQUEST:
251 case LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE:
252 case LWAPP_MSGTYPE_WTP_EVENT_REQUEST:
253 case LWAPP_MSGTYPE_WTP_EVENT_RESPONSE:
254 case LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST:
255 case LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE:
256 case LWAPP_MSGTYPE_ECHO_REQUEST:
257 case LWAPP_MSGTYPE_ECHO_RESPONSE:
258 case LWAPP_MSGTYPE_IMAGE_DATA_REQUEST:
259 case LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE:
260 case LWAPP_MSGTYPE_RESET_REQUEST:
261 case LWAPP_MSGTYPE_RESET_RESPONSE:
262 case LWAPP_MSGTYPE_KEY_UPDATE_REQUEST:
263 case LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE:
264 case LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST:
265 case LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE:
266 case LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST:
267 case LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE:
268 case LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION:
269 case LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST:
270 case LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE:
271 case LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST:
272 case LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE:
273 default:
274 break;
275 }
276  
277 tptr += sizeof(struct lwapp_control_header) + msg_tlen;
278 tlen -= sizeof(struct lwapp_control_header) + msg_tlen;
279 }
280 return;
281  
282 trunc:
283 ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
284 }
285  
286 void
287 lwapp_data_print(netdissect_options *ndo,
288 const u_char *pptr, u_int len)
289 {
290 const struct lwapp_transport_header *lwapp_trans_header;
291 const u_char *tptr;
292 int tlen;
293  
294 tptr=pptr;
295  
296 /* check if enough bytes for AP identity */
297 ND_TCHECK2(*tptr, 6);
298 lwapp_trans_header = (const struct lwapp_transport_header *)pptr;
299 ND_TCHECK(*lwapp_trans_header);
300  
301 /*
302 * Sanity checking of the header.
303 */
304 if (LWAPP_EXTRACT_VERSION(lwapp_trans_header->version) != LWAPP_VERSION) {
305 ND_PRINT((ndo, "LWAPP version %u packet not supported",
306 LWAPP_EXTRACT_VERSION(lwapp_trans_header->version)));
307 return;
308 }
309  
310 /* non-verbose */
311 if (ndo->ndo_vflag < 1) {
312 ND_PRINT((ndo, "LWAPPv%u, %s frame, Flags [%s], length %u",
313 LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
314 LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
315 bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
316 len));
317 return;
318 }
319  
320 /* ok they seem to want to know everything - lets fully decode it */
321 tlen=EXTRACT_16BITS(lwapp_trans_header->length);
322  
323 ND_PRINT((ndo, "LWAPPv%u, %s frame, Radio-id %u, Flags [%s], Frag-id %u, length %u",
324 LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
325 LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
326 LWAPP_EXTRACT_RID(lwapp_trans_header->version),
327 bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
328 lwapp_trans_header->frag_id,
329 tlen));
330  
331 tptr+=sizeof(const struct lwapp_transport_header);
332 tlen-=sizeof(const struct lwapp_transport_header);
333  
334 /* FIX - An IEEE 802.11 frame follows - hexdump for now */
335 print_unknown_data(ndo, tptr, "\n\t", tlen);
336  
337 return;
338  
339 trunc:
340 ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
341 }
342  
343 /*
344 * Local Variables:
345 * c-style: whitesmith
346 * c-basic-offset: 8
347 * End:
348 */