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 #include <config.h> 23 24 #include "netdissect-stdinc.h" 25 26 #include "netdissect.h" 27 #include "extract.h" 28 #include "addrtoname.h" 29 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 nd_uint8_t version; 45 nd_uint8_t frag_id; 46 nd_uint16_t length; 47 nd_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 nd_uint8_t msg_type; 65 nd_uint8_t seq_num; 66 nd_uint16_t len; 67 nd_uint32_t session_id; 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 nd_uint8_t type; 160 nd_uint16_t length; 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 uint8_t version; 171 u_int tlen; 172 u_int msg_type, msg_tlen; 173 174 ndo->ndo_protocol = "lwapp_control"; 175 tptr=pptr; 176 177 if (has_ap_ident) { 178 /* check if enough bytes for AP identity */ 179 ND_TCHECK_6(tptr); 180 lwapp_trans_header = (const struct lwapp_transport_header *)(pptr+6); 181 } else { 182 lwapp_trans_header = (const struct lwapp_transport_header *)pptr; 183 } 184 ND_TCHECK_SIZE(lwapp_trans_header); 185 version = GET_U_1(lwapp_trans_header->version); 186 187 /* 188 * Sanity checking of the header. 189 */ 190 if (LWAPP_EXTRACT_VERSION(version) != LWAPP_VERSION) { 191 ND_PRINT("LWAPP version %u packet not supported", 192 LWAPP_EXTRACT_VERSION(version)); 193 return; 194 } 195 196 /* non-verbose */ 197 if (ndo->ndo_vflag < 1) { 198 ND_PRINT("LWAPPv%u, %s frame, Flags [%s], length %u", 199 LWAPP_EXTRACT_VERSION(version), 200 LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data", 201 bittok2str(lwapp_header_bits_values,"none",version&0x07), 202 len); 203 return; 204 } 205 206 /* ok they seem to want to know everything - lets fully decode it */ 207 tlen=GET_BE_U_2(lwapp_trans_header->length); 208 209 ND_PRINT("LWAPPv%u, %s frame, Radio-id %u, Flags [%s], Frag-id %u, length %u", 210 LWAPP_EXTRACT_VERSION(version), 211 LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data", 212 LWAPP_EXTRACT_RID(version), 213 bittok2str(lwapp_header_bits_values,"none",version&0x07), 214 GET_U_1(lwapp_trans_header->frag_id), 215 tlen); 216 217 if (has_ap_ident) { 218 ND_PRINT("\n\tAP identity: %s", GET_ETHERADDR_STRING(tptr)); 219 tptr+=sizeof(struct lwapp_transport_header)+6; 220 } else { 221 tptr+=sizeof(struct lwapp_transport_header); 222 } 223 224 while(tlen!=0) { 225 226 /* did we capture enough for fully decoding the object header ? */ 227 ND_TCHECK_LEN(tptr, sizeof(struct lwapp_control_header)); 228 if (tlen < sizeof(struct lwapp_control_header)) { 229 ND_PRINT("\n\t Msg goes past end of PDU"); 230 break; 231 } 232 233 lwapp_control_header = (const struct lwapp_control_header *)tptr; 234 msg_tlen = GET_BE_U_2(lwapp_control_header->len); 235 if (tlen < sizeof(struct lwapp_control_header) + msg_tlen) { 236 ND_PRINT("\n\t Msg goes past end of PDU"); 237 break; 238 } 239 240 /* print message header */ 241 msg_type = GET_U_1(lwapp_control_header->msg_type); 242 ND_PRINT("\n\t Msg type: %s (%u), Seqnum: %u, Msg len: %u, Session: 0x%08x", 243 tok2str(lwapp_msg_type_values,"Unknown",msg_type), 244 msg_type, 245 GET_U_1(lwapp_control_header->seq_num), 246 msg_tlen, 247 GET_BE_U_4(lwapp_control_header->session_id)); 248 249 /* did we capture enough for fully decoding the message */ 250 ND_TCHECK_LEN(tptr, msg_tlen); 251 252 /* XXX - Decode sub messages for each message */ 253 switch(msg_type) { 254 case LWAPP_MSGTYPE_DISCOVERY_REQUEST: 255 case LWAPP_MSGTYPE_DISCOVERY_RESPONSE: 256 case LWAPP_MSGTYPE_JOIN_REQUEST: 257 case LWAPP_MSGTYPE_JOIN_RESPONSE: 258 case LWAPP_MSGTYPE_JOIN_ACK: 259 case LWAPP_MSGTYPE_JOIN_CONFIRM: 260 case LWAPP_MSGTYPE_CONFIGURE_REQUEST: 261 case LWAPP_MSGTYPE_CONFIGURE_RESPONSE: 262 case LWAPP_MSGTYPE_CONF_UPDATE_REQUEST: 263 case LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE: 264 case LWAPP_MSGTYPE_WTP_EVENT_REQUEST: 265 case LWAPP_MSGTYPE_WTP_EVENT_RESPONSE: 266 case LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST: 267 case LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE: 268 case LWAPP_MSGTYPE_ECHO_REQUEST: 269 case LWAPP_MSGTYPE_ECHO_RESPONSE: 270 case LWAPP_MSGTYPE_IMAGE_DATA_REQUEST: 271 case LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE: 272 case LWAPP_MSGTYPE_RESET_REQUEST: 273 case LWAPP_MSGTYPE_RESET_RESPONSE: 274 case LWAPP_MSGTYPE_KEY_UPDATE_REQUEST: 275 case LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE: 276 case LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST: 277 case LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE: 278 case LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST: 279 case LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE: 280 case LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION: 281 case LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST: 282 case LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE: 283 case LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST: 284 case LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE: 285 default: 286 break; 287 } 288 289 tptr += sizeof(struct lwapp_control_header) + msg_tlen; 290 tlen -= sizeof(struct lwapp_control_header) + msg_tlen; 291 } 292 return; 293 294 trunc: 295 nd_print_trunc(ndo); 296 } 297 298 void 299 lwapp_data_print(netdissect_options *ndo, 300 const u_char *pptr, u_int len) 301 { 302 const struct lwapp_transport_header *lwapp_trans_header; 303 const u_char *tptr; 304 u_int tlen; 305 u_int version; 306 307 ndo->ndo_protocol = "lwapp_data"; 308 tptr=pptr; 309 310 /* check if enough bytes for AP identity */ 311 ND_TCHECK_6(tptr); 312 lwapp_trans_header = (const struct lwapp_transport_header *)pptr; 313 ND_TCHECK_SIZE(lwapp_trans_header); 314 version = GET_U_1(lwapp_trans_header->version); 315 316 /* 317 * Sanity checking of the header. 318 */ 319 if (LWAPP_EXTRACT_VERSION(version) != LWAPP_VERSION) { 320 ND_PRINT("LWAPP version %u packet not supported", 321 LWAPP_EXTRACT_VERSION(version)); 322 return; 323 } 324 325 /* non-verbose */ 326 if (ndo->ndo_vflag < 1) { 327 ND_PRINT("LWAPPv%u, %s frame, Flags [%s], length %u", 328 LWAPP_EXTRACT_VERSION(version), 329 LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data", 330 bittok2str(lwapp_header_bits_values,"none",version&0x07), 331 len); 332 return; 333 } 334 335 /* ok they seem to want to know everything - lets fully decode it */ 336 tlen=GET_BE_U_2(lwapp_trans_header->length); 337 if (tlen < sizeof(struct lwapp_transport_header)) { 338 ND_PRINT("LWAPPv%u, %s frame, Radio-id %u, Flags [%s], length %u < transport header length", 339 LWAPP_EXTRACT_VERSION(version), 340 LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data", 341 LWAPP_EXTRACT_RID(version), 342 bittok2str(lwapp_header_bits_values,"none",version&0x07), 343 tlen); 344 return; 345 } 346 347 ND_PRINT("LWAPPv%u, %s frame, Radio-id %u, Flags [%s], Frag-id %u, length %u", 348 LWAPP_EXTRACT_VERSION(version), 349 LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data", 350 LWAPP_EXTRACT_RID(version), 351 bittok2str(lwapp_header_bits_values,"none",version&0x07), 352 GET_U_1(lwapp_trans_header->frag_id), 353 tlen); 354 355 tptr+=sizeof(struct lwapp_transport_header); 356 tlen-=sizeof(struct lwapp_transport_header); 357 358 /* FIX - An IEEE 802.11 frame follows - hexdump for now */ 359 print_unknown_data(ndo, tptr, "\n\t", tlen); 360 361 return; 362 363 trunc: 364 nd_print_trunc(ndo); 365 } 366