print-lwapp.c revision 1.1.1.7
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 (at) 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 = GET_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=GET_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 GET_U_1(lwapp_trans_header->frag_id), 217 tlen); 218 219 if (has_ap_ident) { 220 ND_PRINT("\n\tAP identity: %s", GET_ETHERADDR_STRING(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 = GET_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 = GET_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 GET_U_1(lwapp_control_header->seq_num), 248 msg_tlen, 249 GET_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 = GET_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=GET_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 GET_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 } 368
Indexes created Sun Oct 04 00:26:11 UTC 2026