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 static const char control_tstr[] = " [|lwapp_control]";
  33 static const char data_tstr[] = " [|lwapp_data]";
  34
  35 /*
  36  * LWAPP transport (common) header
  37  *      0                   1                   2                   3
  38  *     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
  39  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  40  *    |VER| RID |C|F|L|    Frag ID    |            Length             |
  41  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  42  *    |          Status/WLANs         |   Payload...  |
  43  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  44  *
  45  */
  46
  47 struct lwapp_transport_header {
  48     nd_uint8_t  version;
  49     nd_uint8_t  frag_id;
  50     nd_uint16_t length;
  51     nd_uint16_t status;
  52 };
  53
  54 /*
  55  * LWAPP control header
  56  *      0                   1                   2                   3
  57  *      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
  58  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  59  *     |  Message Type |    Seq Num    |      Msg Element Length       |
  60  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  61  *     |                           Session ID                          |
  62  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  63  *     |      Msg Element [0..N]       |
  64  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  65  */
  66
  67 struct lwapp_control_header {
  68     nd_uint8_t  msg_type;
  69     nd_uint8_t  seq_num;
  70     nd_uint16_t len;
  71     nd_uint32_t session_id;
  72 };
  73
  74 #define LWAPP_VERSION 0
  75 #define LWAPP_EXTRACT_VERSION(x) (((x)&0xC0)>>6)
  76 #define LWAPP_EXTRACT_RID(x) (((x)&0x38)>>3)
  77 #define LWAPP_EXTRACT_CONTROL_BIT(x) (((x)&0x04)>>2)
  78
  79 static const struct tok lwapp_header_bits_values[] = {
  80     { 0x01, "Last Fragment Bit"},
  81     { 0x02, "Fragment Bit"},
  82     { 0x04, "Control Bit"},
  83     { 0, NULL}
  84 };
  85
  86 #define LWAPP_MSGTYPE_DISCOVERY_REQUEST                 1
  87 #define LWAPP_MSGTYPE_DISCOVERY_RESPONSE                2
  88 #define LWAPP_MSGTYPE_JOIN_REQUEST                      3
  89 #define LWAPP_MSGTYPE_JOIN_RESPONSE                     4
  90 #define LWAPP_MSGTYPE_JOIN_ACK                          5
  91 #define LWAPP_MSGTYPE_JOIN_CONFIRM                      6
  92 #define LWAPP_MSGTYPE_CONFIGURE_REQUEST                 10
  93 #define LWAPP_MSGTYPE_CONFIGURE_RESPONSE                11
  94 #define LWAPP_MSGTYPE_CONF_UPDATE_REQUEST               12
  95 #define LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE              13
  96 #define LWAPP_MSGTYPE_WTP_EVENT_REQUEST                 14
  97 #define LWAPP_MSGTYPE_WTP_EVENT_RESPONSE                15
  98 #define LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST        16
  99 #define LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE       17
 100 #define LWAPP_MSGTYPE_ECHO_REQUEST                      22
 101 #define LWAPP_MSGTYPE_ECHO_RESPONSE                     23
 102 #define LWAPP_MSGTYPE_IMAGE_DATA_REQUEST                24
 103 #define LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE               25
 104 #define LWAPP_MSGTYPE_RESET_REQUEST                     26
 105 #define LWAPP_MSGTYPE_RESET_RESPONSE                    27
 106 #define LWAPP_MSGTYPE_KEY_UPDATE_REQUEST                30
 107 #define LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE               31
 108 #define LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST         32
 109 #define LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE        33
 110 #define LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST             34
 111 #define LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE            35
 112 #define LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION           36
 113 #define LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST               37
 114 #define LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE              38
 115 #define LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST             39
 116 #define LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE            40
 117
 118 static const struct tok lwapp_msg_type_values[] = {
 119     { LWAPP_MSGTYPE_DISCOVERY_REQUEST, "Discovery req"},
 120     { LWAPP_MSGTYPE_DISCOVERY_RESPONSE, "Discovery resp"},
 121     { LWAPP_MSGTYPE_JOIN_REQUEST, "Join req"},
 122     { LWAPP_MSGTYPE_JOIN_RESPONSE, "Join resp"},
 123     { LWAPP_MSGTYPE_JOIN_ACK, "Join ack"},
 124     { LWAPP_MSGTYPE_JOIN_CONFIRM, "Join confirm"},
 125     { LWAPP_MSGTYPE_CONFIGURE_REQUEST, "Configure req"},
 126     { LWAPP_MSGTYPE_CONFIGURE_RESPONSE, "Configure resp"},
 127     { LWAPP_MSGTYPE_CONF_UPDATE_REQUEST, "Update req"},
 128     { LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE, "Update resp"},
 129     { LWAPP_MSGTYPE_WTP_EVENT_REQUEST, "WTP event req"},
 130     { LWAPP_MSGTYPE_WTP_EVENT_RESPONSE, "WTP event resp"},
 131     { LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST, "Change state event req"},
 132     { LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE, "Change state event resp"},
 133     { LWAPP_MSGTYPE_ECHO_REQUEST, "Echo req"},
 134     { LWAPP_MSGTYPE_ECHO_RESPONSE, "Echo resp"},
 135     { LWAPP_MSGTYPE_IMAGE_DATA_REQUEST, "Image data req"},
 136     { LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE, "Image data resp"},
 137     { LWAPP_MSGTYPE_RESET_REQUEST, "Channel status req"},
 138     { LWAPP_MSGTYPE_RESET_RESPONSE, "Channel status resp"},
 139     { LWAPP_MSGTYPE_KEY_UPDATE_REQUEST, "Key update req"},
 140     { LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE, "Key update resp"},
 141     { LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST, "Primary discovery req"},
 142     { LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE, "Primary discovery resp"},
 143     { LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST, "Data transfer req"},
 144     { LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE, "Data transfer resp"},
 145     { LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION, "Clear config ind"},
 146     { LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST, "Wlan config req"},
 147     { LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE, "Wlan config resp"},
 148     { LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST, "Mobile config req"},
 149     { LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE, "Mobile config resp"},
 150     { 0, NULL}
 151 };
 152
 153 /*
 154  * LWAPP message elements
 155  *
 156  * 0                   1                   2                   3
 157  * 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
 158  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 159  * |      Type     |             Length            |   Value ...   |
 160  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 161  */
 162 struct lwapp_message_header {
 163     nd_uint8_t  type;
 164     nd_uint16_t length;
 165 };
 166
 167 void
 168 lwapp_control_print(netdissect_options *ndo,
 169                     const u_char *pptr, u_int len, int has_ap_ident)
 170 {
 171     const struct lwapp_transport_header *lwapp_trans_header;
 172     const struct lwapp_control_header *lwapp_control_header;
 173     const u_char *tptr;
 174     uint8_t version;
 175     u_int tlen;
 176     u_int msg_type, msg_tlen;
 177
 178     tptr=pptr;
 179
 180     if (has_ap_ident) {
 181         /* check if enough bytes for AP identity */
 182         ND_TCHECK_6(tptr);
 183         lwapp_trans_header = (const struct lwapp_transport_header *)(pptr+6);
 184     } else {
 185         lwapp_trans_header = (const struct lwapp_transport_header *)pptr;
 186     }
 187     ND_TCHECK_SIZE(lwapp_trans_header);
 188     version = EXTRACT_U_1(lwapp_trans_header->version);
 189
 190     /*
 191      * Sanity checking of the header.
 192      */
 193     if (LWAPP_EXTRACT_VERSION(version) != LWAPP_VERSION) {
 194         ND_PRINT("LWAPP version %u packet not supported",
 195                LWAPP_EXTRACT_VERSION(version));
 196         return;
 197     }
 198
 199     /* non-verbose */
 200     if (ndo->ndo_vflag < 1) {
 201         ND_PRINT("LWAPPv%u, %s frame, Flags [%s], length %u",
 202                LWAPP_EXTRACT_VERSION(version),
 203                LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data",
 204                bittok2str(lwapp_header_bits_values,"none",version&0x07),
 205                len);
 206         return;
 207     }
 208
 209     /* ok they seem to want to know everything - lets fully decode it */
 210     tlen=EXTRACT_BE_U_2(lwapp_trans_header->length);
 211
 212     ND_PRINT("LWAPPv%u, %s frame, Radio-id %u, Flags [%s], Frag-id %u, length %u",
 213            LWAPP_EXTRACT_VERSION(version),
 214            LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data",
 215            LWAPP_EXTRACT_RID(version),
 216            bittok2str(lwapp_header_bits_values,"none",version&0x07),
 217            EXTRACT_U_1(lwapp_trans_header->frag_id),
 218            tlen);
 219
 220     if (has_ap_ident) {
 221         ND_PRINT("\n\tAP identity: %s", etheraddr_string(ndo, tptr));
 222         tptr+=sizeof(struct lwapp_transport_header)+6;
 223     } else {
 224         tptr+=sizeof(struct lwapp_transport_header);
 225     }
 226
 227     while(tlen!=0) {
 228
 229         /* did we capture enough for fully decoding the object header ? */
 230         ND_TCHECK_LEN(tptr, sizeof(struct lwapp_control_header));
 231         if (tlen < sizeof(struct lwapp_control_header)) {
 232             ND_PRINT("\n\t  Msg goes past end of PDU");
 233             break;
 234         }
 235
 236         lwapp_control_header = (const struct lwapp_control_header *)tptr;
 237         msg_tlen = EXTRACT_BE_U_2(lwapp_control_header->len);
 238         if (tlen < sizeof(struct lwapp_control_header) + msg_tlen) {
 239             ND_PRINT("\n\t  Msg goes past end of PDU");
 240             break;
 241         }
 242
 243         /* print message header */
 244         msg_type = EXTRACT_U_1(lwapp_control_header->msg_type);
 245         ND_PRINT("\n\t  Msg type: %s (%u), Seqnum: %u, Msg len: %u, Session: 0x%08x",
 246                tok2str(lwapp_msg_type_values,"Unknown",msg_type),
 247                msg_type,
 248                EXTRACT_U_1(lwapp_control_header->seq_num),
 249                msg_tlen,
 250                EXTRACT_BE_U_4(lwapp_control_header->session_id));
 251
 252         /* did we capture enough for fully decoding the message */
 253         ND_TCHECK_LEN(tptr, msg_tlen);
 254
 255         /* XXX - Decode sub messages for each message */
 256         switch(msg_type) {
 257         case LWAPP_MSGTYPE_DISCOVERY_REQUEST:
 258         case LWAPP_MSGTYPE_DISCOVERY_RESPONSE:
 259         case LWAPP_MSGTYPE_JOIN_REQUEST:
 260         case LWAPP_MSGTYPE_JOIN_RESPONSE:
 261         case LWAPP_MSGTYPE_JOIN_ACK:
 262         case LWAPP_MSGTYPE_JOIN_CONFIRM:
 263         case LWAPP_MSGTYPE_CONFIGURE_REQUEST:
 264         case LWAPP_MSGTYPE_CONFIGURE_RESPONSE:
 265         case LWAPP_MSGTYPE_CONF_UPDATE_REQUEST:
 266         case LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE:
 267         case LWAPP_MSGTYPE_WTP_EVENT_REQUEST:
 268         case LWAPP_MSGTYPE_WTP_EVENT_RESPONSE:
 269         case LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST:
 270         case LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE:
 271         case LWAPP_MSGTYPE_ECHO_REQUEST:
 272         case LWAPP_MSGTYPE_ECHO_RESPONSE:
 273         case LWAPP_MSGTYPE_IMAGE_DATA_REQUEST:
 274         case LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE:
 275         case LWAPP_MSGTYPE_RESET_REQUEST:
 276         case LWAPP_MSGTYPE_RESET_RESPONSE:
 277         case LWAPP_MSGTYPE_KEY_UPDATE_REQUEST:
 278         case LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE:
 279         case LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST:
 280         case LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE:
 281         case LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST:
 282         case LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE:
 283         case LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION:
 284         case LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST:
 285         case LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE:
 286         case LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST:
 287         case LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE:
 288         default:
 289             break;
 290         }
 291
 292         tptr += sizeof(struct lwapp_control_header) + msg_tlen;
 293         tlen -= sizeof(struct lwapp_control_header) + msg_tlen;
 294     }
 295     return;
 296
 297 trunc:
 298     ND_PRINT("%s", control_tstr);
 299 }
 300
 301 void
 302 lwapp_data_print(netdissect_options *ndo,
 303                  const u_char *pptr, u_int len)
 304 {
 305     const struct lwapp_transport_header *lwapp_trans_header;
 306     const u_char *tptr;
 307     u_int tlen;
 308     u_int version;
 309
 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("%s", data_tstr);
 367 }
 368
 369 /*
 370  * Local Variables:
 371  * c-style: whitesmith
 372  * c-basic-offset: 8
 373  * End:
 374  */