The Tcpdump Group git mirrors - tcpdump/blob - print-lwapp.c

   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  * LWAPP transport (common) header
  34  *      0                   1                   2                   3
  35  *     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
  36  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  37  *    |VER| RID |C|F|L|    Frag ID    |            Length             |
  38  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  39  *    |          Status/WLANs         |   Payload...  |
  40  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  41  *
  42  */
  43
  44 struct lwapp_transport_header {
  45     uint8_t  version;
  46     uint8_t  frag_id;
  47     uint8_t  length[2];
  48     uint16_t status;
  49 };
  50
  51 /*
  52  * LWAPP control header
  53  *      0                   1                   2                   3
  54  *      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
  55  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  56  *     |  Message Type |    Seq Num    |      Msg Element Length       |
  57  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  58  *     |                           Session ID                          |
  59  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  60  *     |      Msg Element [0..N]       |
  61  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  62  */
  63
  64 struct lwapp_control_header {
  65     uint8_t  msg_type;
  66     uint8_t  seq_num;
  67     uint8_t  len[2];
  68     uint8_t  session_id[4];
  69 };
  70
  71 #define LWAPP_VERSION 0
  72 #define LWAPP_EXTRACT_VERSION(x) (((x)&0xC0)>>6)
  73 #define LWAPP_EXTRACT_RID(x) (((x)&0x38)>>3)
  74 #define LWAPP_EXTRACT_CONTROL_BIT(x) (((x)&0x04)>>2)
  75
  76 static const struct tok lwapp_header_bits_values[] = {
  77     { 0x01, "Last Fragment Bit"},
  78     { 0x02, "Fragment Bit"},
  79     { 0x04, "Control Bit"},
  80     { 0, NULL}
  81 };
  82
  83 #define LWAPP_MSGTYPE_DISCOVERY_REQUEST                 1
  84 #define LWAPP_MSGTYPE_DISCOVERY_RESPONSE                2
  85 #define LWAPP_MSGTYPE_JOIN_REQUEST                      3
  86 #define LWAPP_MSGTYPE_JOIN_RESPONSE                     4
  87 #define LWAPP_MSGTYPE_JOIN_ACK                          5
  88 #define LWAPP_MSGTYPE_JOIN_CONFIRM                      6
  89 #define LWAPP_MSGTYPE_CONFIGURE_REQUEST                 10
  90 #define LWAPP_MSGTYPE_CONFIGURE_RESPONSE                11
  91 #define LWAPP_MSGTYPE_CONF_UPDATE_REQUEST               12
  92 #define LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE              13
  93 #define LWAPP_MSGTYPE_WTP_EVENT_REQUEST                 14
  94 #define LWAPP_MSGTYPE_WTP_EVENT_RESPONSE                15
  95 #define LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST        16
  96 #define LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE       17
  97 #define LWAPP_MSGTYPE_ECHO_REQUEST                      22
  98 #define LWAPP_MSGTYPE_ECHO_RESPONSE                     23
  99 #define LWAPP_MSGTYPE_IMAGE_DATA_REQUEST                24
 100 #define LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE               25
 101 #define LWAPP_MSGTYPE_RESET_REQUEST                     26
 102 #define LWAPP_MSGTYPE_RESET_RESPONSE                    27
 103 #define LWAPP_MSGTYPE_KEY_UPDATE_REQUEST                30
 104 #define LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE               31
 105 #define LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST         32
 106 #define LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE        33
 107 #define LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST             34
 108 #define LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE            35
 109 #define LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION           36
 110 #define LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST               37
 111 #define LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE              38
 112 #define LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST             39
 113 #define LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE            40
 114
 115 static const struct tok lwapp_msg_type_values[] = {
 116     { LWAPP_MSGTYPE_DISCOVERY_REQUEST, "Discovery req"},
 117     { LWAPP_MSGTYPE_DISCOVERY_RESPONSE, "Discovery resp"},
 118     { LWAPP_MSGTYPE_JOIN_REQUEST, "Join req"},
 119     { LWAPP_MSGTYPE_JOIN_RESPONSE, "Join resp"},
 120     { LWAPP_MSGTYPE_JOIN_ACK, "Join ack"},
 121     { LWAPP_MSGTYPE_JOIN_CONFIRM, "Join confirm"},
 122     { LWAPP_MSGTYPE_CONFIGURE_REQUEST, "Configure req"},
 123     { LWAPP_MSGTYPE_CONFIGURE_RESPONSE, "Configure resp"},
 124     { LWAPP_MSGTYPE_CONF_UPDATE_REQUEST, "Update req"},
 125     { LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE, "Update resp"},
 126     { LWAPP_MSGTYPE_WTP_EVENT_REQUEST, "WTP event req"},
 127     { LWAPP_MSGTYPE_WTP_EVENT_RESPONSE, "WTP event resp"},
 128     { LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST, "Change state event req"},
 129     { LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE, "Change state event resp"},
 130     { LWAPP_MSGTYPE_ECHO_REQUEST, "Echo req"},
 131     { LWAPP_MSGTYPE_ECHO_RESPONSE, "Echo resp"},
 132     { LWAPP_MSGTYPE_IMAGE_DATA_REQUEST, "Image data req"},
 133     { LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE, "Image data resp"},
 134     { LWAPP_MSGTYPE_RESET_REQUEST, "Channel status req"},
 135     { LWAPP_MSGTYPE_RESET_RESPONSE, "Channel status resp"},
 136     { LWAPP_MSGTYPE_KEY_UPDATE_REQUEST, "Key update req"},
 137     { LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE, "Key update resp"},
 138     { LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST, "Primary discovery req"},
 139     { LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE, "Primary discovery resp"},
 140     { LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST, "Data transfer req"},
 141     { LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE, "Data transfer resp"},
 142     { LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION, "Clear config ind"},
 143     { LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST, "Wlan config req"},
 144     { LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE, "Wlan config resp"},
 145     { LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST, "Mobile config req"},
 146     { LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE, "Mobile config resp"},
 147     { 0, NULL}
 148 };
 149
 150 /*
 151  * LWAPP message elements
 152  *
 153  * 0                   1                   2                   3
 154  * 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
 155  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 156  * |      Type     |             Length            |   Value ...   |
 157  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 158  */
 159 struct lwapp_message_header {
 160     uint8_t type;
 161     uint8_t length[2];
 162 };
 163
 164 void
 165 lwapp_control_print(netdissect_options *ndo,
 166                     const u_char *pptr, u_int len, int has_ap_ident)
 167 {
 168     const struct lwapp_transport_header *lwapp_trans_header;
 169     const struct lwapp_control_header *lwapp_control_header;
 170     const u_char *tptr;
 171     int  tlen;
 172     int  msg_tlen;
 173
 174     tptr=pptr;
 175
 176     if (has_ap_ident) {
 177         /* check if enough bytes for AP identity */
 178         ND_TCHECK_6(tptr);
 179         lwapp_trans_header = (const struct lwapp_transport_header *)(pptr+6);
 180     } else {
 181         lwapp_trans_header = (const struct lwapp_transport_header *)pptr;
 182     }
 183     ND_TCHECK(*lwapp_trans_header);
 184
 185     /*
 186      * Sanity checking of the header.
 187      */
 188     if (LWAPP_EXTRACT_VERSION(lwapp_trans_header->version) != LWAPP_VERSION) {
 189         ND_PRINT((ndo, "LWAPP version %u packet not supported",
 190                LWAPP_EXTRACT_VERSION(lwapp_trans_header->version)));
 191         return;
 192     }
 193
 194     /* non-verbose */
 195     if (ndo->ndo_vflag < 1) {
 196         ND_PRINT((ndo, "LWAPPv%u, %s frame, Flags [%s], length %u",
 197                LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
 198                LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
 199                bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
 200                len));
 201         return;
 202     }
 203
 204     /* ok they seem to want to know everything - lets fully decode it */
 205     tlen=EXTRACT_BE_U_2(lwapp_trans_header->length);
 206
 207     ND_PRINT((ndo, "LWAPPv%u, %s frame, Radio-id %u, Flags [%s], Frag-id %u, length %u",
 208            LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
 209            LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
 210            LWAPP_EXTRACT_RID(lwapp_trans_header->version),
 211            bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
 212            lwapp_trans_header->frag_id,
 213            tlen));
 214
 215     if (has_ap_ident) {
 216         ND_PRINT((ndo, "\n\tAP identity: %s", etheraddr_string(ndo, tptr)));
 217         tptr+=sizeof(struct lwapp_transport_header)+6;
 218     } else {
 219         tptr+=sizeof(struct lwapp_transport_header);
 220     }
 221
 222     while(tlen>0) {
 223
 224         /* did we capture enough for fully decoding the object header ? */
 225         ND_TCHECK2(*tptr, sizeof(struct lwapp_control_header));
 226
 227         lwapp_control_header = (const struct lwapp_control_header *)tptr;
 228         msg_tlen = EXTRACT_BE_U_2(lwapp_control_header->len);
 229
 230         /* print message header */
 231         ND_PRINT((ndo, "\n\t  Msg type: %s (%u), Seqnum: %u, Msg len: %d, Session: 0x%08x",
 232                tok2str(lwapp_msg_type_values,"Unknown",lwapp_control_header->msg_type),
 233                lwapp_control_header->msg_type,
 234                lwapp_control_header->seq_num,
 235                msg_tlen,
 236                EXTRACT_BE_U_4(lwapp_control_header->session_id)));
 237
 238         /* did we capture enough for fully decoding the message */
 239         ND_TCHECK2(*tptr, msg_tlen);
 240
 241         /* XXX - Decode sub messages for each message */
 242         switch(lwapp_control_header->msg_type) {
 243         case LWAPP_MSGTYPE_DISCOVERY_REQUEST:
 244         case LWAPP_MSGTYPE_DISCOVERY_RESPONSE:
 245         case LWAPP_MSGTYPE_JOIN_REQUEST:
 246         case LWAPP_MSGTYPE_JOIN_RESPONSE:
 247         case LWAPP_MSGTYPE_JOIN_ACK:
 248         case LWAPP_MSGTYPE_JOIN_CONFIRM:
 249         case LWAPP_MSGTYPE_CONFIGURE_REQUEST:
 250         case LWAPP_MSGTYPE_CONFIGURE_RESPONSE:
 251         case LWAPP_MSGTYPE_CONF_UPDATE_REQUEST:
 252         case LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE:
 253         case LWAPP_MSGTYPE_WTP_EVENT_REQUEST:
 254         case LWAPP_MSGTYPE_WTP_EVENT_RESPONSE:
 255         case LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST:
 256         case LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE:
 257         case LWAPP_MSGTYPE_ECHO_REQUEST:
 258         case LWAPP_MSGTYPE_ECHO_RESPONSE:
 259         case LWAPP_MSGTYPE_IMAGE_DATA_REQUEST:
 260         case LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE:
 261         case LWAPP_MSGTYPE_RESET_REQUEST:
 262         case LWAPP_MSGTYPE_RESET_RESPONSE:
 263         case LWAPP_MSGTYPE_KEY_UPDATE_REQUEST:
 264         case LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE:
 265         case LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST:
 266         case LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE:
 267         case LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST:
 268         case LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE:
 269         case LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION:
 270         case LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST:
 271         case LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE:
 272         case LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST:
 273         case LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE:
 274         default:
 275             break;
 276         }
 277
 278         tptr += sizeof(struct lwapp_control_header) + msg_tlen;
 279         tlen -= sizeof(struct lwapp_control_header) + msg_tlen;
 280     }
 281     return;
 282
 283  trunc:
 284     ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 285 }
 286
 287 void
 288 lwapp_data_print(netdissect_options *ndo,
 289                  const u_char *pptr, u_int len)
 290 {
 291     const struct lwapp_transport_header *lwapp_trans_header;
 292     const u_char *tptr;
 293     int tlen;
 294
 295     tptr=pptr;
 296
 297     /* check if enough bytes for AP identity */
 298     ND_TCHECK_6(tptr);
 299     lwapp_trans_header = (const struct lwapp_transport_header *)pptr;
 300     ND_TCHECK(*lwapp_trans_header);
 301
 302     /*
 303      * Sanity checking of the header.
 304      */
 305     if (LWAPP_EXTRACT_VERSION(lwapp_trans_header->version) != LWAPP_VERSION) {
 306         ND_PRINT((ndo, "LWAPP version %u packet not supported",
 307                LWAPP_EXTRACT_VERSION(lwapp_trans_header->version)));
 308         return;
 309     }
 310
 311     /* non-verbose */
 312     if (ndo->ndo_vflag < 1) {
 313         ND_PRINT((ndo, "LWAPPv%u, %s frame, Flags [%s], length %u",
 314                LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
 315                LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
 316                bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
 317                len));
 318         return;
 319     }
 320
 321     /* ok they seem to want to know everything - lets fully decode it */
 322     tlen=EXTRACT_BE_U_2(lwapp_trans_header->length);
 323
 324     ND_PRINT((ndo, "LWAPPv%u, %s frame, Radio-id  %u, Flags [%s], Frag-id  %u, length %u",
 325            LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
 326            LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
 327            LWAPP_EXTRACT_RID(lwapp_trans_header->version),
 328            bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
 329            lwapp_trans_header->frag_id,
 330            tlen));
 331
 332     tptr+=sizeof(struct lwapp_transport_header);
 333     tlen-=sizeof(struct lwapp_transport_header);
 334
 335     /* FIX - An IEEE 802.11 frame follows - hexdump for now */
 336     print_unknown_data(ndo, tptr, "\n\t", tlen);
 337
 338     return;
 339
 340  trunc:
 341     ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 342 }
 343
 344 /*
 345  * Local Variables:
 346  * c-style: whitesmith
 347  * c-basic-offset: 8
 348  * End:
 349  */