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  * Support for the Light Weight Access Point Protocol as per draft-ohara-capwap-lwapp-04
  16  *
  17  * Original code by Carles Kishimoto <carles.kishimoto@gmail.com>
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include <tcpdump-stdinc.h>
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "interface.h"
  31 #include "extract.h"
  32 #include "addrtoname.h"
  33
  34 /*
  35  * LWAPP transport (common) header
  36  *      0                   1                   2                   3
  37  *     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
  38  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  39  *    |VER| RID |C|F|L|    Frag ID    |            Length             |
  40  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  41  *    |          Status/WLANs         |   Payload...  |
  42  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  43  *
  44  */
  45
  46 struct lwapp_transport_header {
  47     u_int8_t  version;
  48     u_int8_t  frag_id;
  49     u_int8_t  length[2];
  50     u_int16_t status;
  51 };
  52
  53 /*
  54  * LWAPP control header
  55  *      0                   1                   2                   3
  56  *      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
  57  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  58  *     |  Message Type |    Seq Num    |      Msg Element Length       |
  59  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  60  *     |                           Session ID                          |
  61  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  62  *     |      Msg Element [0..N]       |
  63  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  64  */
  65
  66 struct lwapp_control_header {
  67     u_int8_t  msg_type;
  68     u_int8_t  seq_num;
  69     u_int8_t  len[2];
  70     u_int8_t  session_id[4];
  71 };
  72
  73 #define LWAPP_VERSION 0
  74 #define LWAPP_EXTRACT_VERSION(x) (((x)&0xC0)>>6)
  75 #define LWAPP_EXTRACT_RID(x) (((x)&0x38)>>3)
  76 #define LWAPP_EXTRACT_CONTROL_BIT(x) (((x)&0x04)>>2)
  77
  78 static const struct tok lwapp_header_bits_values[] = {
  79     { 0x01, "Last Fragment Bit"},
  80     { 0x02, "Fragment Bit"},
  81     { 0x04, "Control Bit"},
  82     { 0, NULL}
  83 };
  84
  85 #define LWAPP_MSGTYPE_DISCOVERY_REQUEST                 1
  86 #define LWAPP_MSGTYPE_DISCOVERY_RESPONSE                2
  87 #define LWAPP_MSGTYPE_JOIN_REQUEST                      3
  88 #define LWAPP_MSGTYPE_JOIN_RESPONSE                     4
  89 #define LWAPP_MSGTYPE_JOIN_ACK                          5
  90 #define LWAPP_MSGTYPE_JOIN_CONFIRM                      6
  91 #define LWAPP_MSGTYPE_CONFIGURE_REQUEST                 10
  92 #define LWAPP_MSGTYPE_CONFIGURE_RESPONSE                11
  93 #define LWAPP_MSGTYPE_CONF_UPDATE_REQUEST               12
  94 #define LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE              13
  95 #define LWAPP_MSGTYPE_WTP_EVENT_REQUEST                 14
  96 #define LWAPP_MSGTYPE_WTP_EVENT_RESPONSE                15
  97 #define LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST        16
  98 #define LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE       17
  99 #define LWAPP_MSGTYPE_ECHO_REQUEST                      22
 100 #define LWAPP_MSGTYPE_ECHO_RESPONSE                     23
 101 #define LWAPP_MSGTYPE_IMAGE_DATA_REQUEST                24
 102 #define LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE               25
 103 #define LWAPP_MSGTYPE_RESET_REQUEST                     26
 104 #define LWAPP_MSGTYPE_RESET_RESPONSE                    27
 105 #define LWAPP_MSGTYPE_KEY_UPDATE_REQUEST                30
 106 #define LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE               31
 107 #define LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST         32
 108 #define LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE        33
 109 #define LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST             34
 110 #define LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE            35
 111 #define LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION           36
 112 #define LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST               37
 113 #define LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE              38
 114 #define LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST             39
 115 #define LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE            40
 116
 117 static const struct tok lwapp_msg_type_values[] = {
 118     { LWAPP_MSGTYPE_DISCOVERY_REQUEST, "Discovery req"},
 119     { LWAPP_MSGTYPE_DISCOVERY_RESPONSE, "Discovery resp"},
 120     { LWAPP_MSGTYPE_JOIN_REQUEST, "Join req"},
 121     { LWAPP_MSGTYPE_JOIN_RESPONSE, "Join resp"},
 122     { LWAPP_MSGTYPE_JOIN_ACK, "Join ack"},
 123     { LWAPP_MSGTYPE_JOIN_CONFIRM, "Join confirm"},
 124     { LWAPP_MSGTYPE_CONFIGURE_REQUEST, "Configure req"},
 125     { LWAPP_MSGTYPE_CONFIGURE_RESPONSE, "Configure resp"},
 126     { LWAPP_MSGTYPE_CONF_UPDATE_REQUEST, "Update req"},
 127     { LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE, "Update resp"},
 128     { LWAPP_MSGTYPE_WTP_EVENT_REQUEST, "WTP event req"},
 129     { LWAPP_MSGTYPE_WTP_EVENT_RESPONSE, "WTP event resp"},
 130     { LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST, "Change state event req"},
 131     { LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE, "Change state event resp"},
 132     { LWAPP_MSGTYPE_ECHO_REQUEST, "Echo req"},
 133     { LWAPP_MSGTYPE_ECHO_RESPONSE, "Echo resp"},
 134     { LWAPP_MSGTYPE_IMAGE_DATA_REQUEST, "Image data req"},
 135     { LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE, "Image data resp"},
 136     { LWAPP_MSGTYPE_RESET_REQUEST, "Channel status req"},
 137     { LWAPP_MSGTYPE_RESET_RESPONSE, "Channel status resp"},
 138     { LWAPP_MSGTYPE_KEY_UPDATE_REQUEST, "Key update req"},
 139     { LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE, "Key update resp"},
 140     { LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST, "Primary discovery req"},
 141     { LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE, "Primary discovery resp"},
 142     { LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST, "Data transfer req"},
 143     { LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE, "Data transfer resp"},
 144     { LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION, "Clear config ind"},
 145     { LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST, "Wlan config req"},
 146     { LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE, "Wlan config resp"},
 147     { LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST, "Mobile config req"},
 148     { LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE, "Mobile config resp"},
 149     { 0, NULL}
 150 };
 151
 152 /*
 153  * LWAPP message elements
 154  *
 155  * 0                   1                   2                   3
 156  * 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
 157  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 158  * |      Type     |             Length            |   Value ...   |
 159  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 160  */
 161 struct lwapp_message_header {
 162     u_int8_t type;
 163     u_int8_t length[2];
 164 };
 165
 166 void
 167 lwapp_control_print(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     int  tlen;
 173     int  msg_tlen;
 174
 175     tptr=pptr;
 176
 177     if (has_ap_ident) {
 178         /* check if enough bytes for AP identity */
 179         if (!TTEST2(*tptr, 6))
 180             goto trunc;
 181         lwapp_trans_header = (const struct lwapp_transport_header *)(pptr+6);
 182     } else {
 183         lwapp_trans_header = (const struct lwapp_transport_header *)pptr;
 184     }
 185     TCHECK(*lwapp_trans_header);
 186
 187     /*
 188      * Sanity checking of the header.
 189      */
 190     if (LWAPP_EXTRACT_VERSION(lwapp_trans_header->version) != LWAPP_VERSION) {
 191         printf("LWAPP version %u packet not supported",
 192                LWAPP_EXTRACT_VERSION(lwapp_trans_header->version));
 193         return;
 194     }
 195
 196     /* non-verbose */
 197     if (vflag < 1) {
 198         printf("LWAPPv%u, %s frame, Flags [%s], length %u",
 199                LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
 200                LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
 201                bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
 202                len);
 203         return;
 204     }
 205
 206     /* ok they seem to want to know everything - lets fully decode it */
 207     tlen=EXTRACT_16BITS(lwapp_trans_header->length);
 208
 209     printf("LWAPPv%u, %s frame, Radio-id %u, Flags [%s], Frag-id %u, length %u",
 210            LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
 211            LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
 212            LWAPP_EXTRACT_RID(lwapp_trans_header->version),
 213            bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
 214            lwapp_trans_header->frag_id,
 215            tlen);
 216
 217     if (has_ap_ident) {
 218         printf("\n\tAP identity: %s",
 219                etheraddr_string(tptr));
 220         tptr+=sizeof(const struct lwapp_transport_header)+6;
 221     } else {
 222         tptr+=sizeof(const struct lwapp_transport_header);
 223     }
 224
 225     while(tlen>0) {
 226
 227         /* did we capture enough for fully decoding the object header ? */
 228         if (!TTEST2(*tptr, sizeof(struct lwapp_control_header)))
 229             goto trunc;
 230
 231         lwapp_control_header = (const struct lwapp_control_header *)tptr;
 232         msg_tlen = EXTRACT_16BITS(lwapp_control_header->len);
 233
 234         /* print message header */
 235         printf("\n\t  Msg type: %s (%u), Seqnum: %u, Msg len: %d, Session: 0x%08x",
 236                tok2str(lwapp_msg_type_values,"Unknown",lwapp_control_header->msg_type),
 237                lwapp_control_header->msg_type,
 238                lwapp_control_header->seq_num,
 239                msg_tlen,
 240                EXTRACT_32BITS(lwapp_control_header->session_id));
 241
 242         /* did we capture enough for fully decoding the message */
 243         if (!TTEST2(*tptr, msg_tlen))
 244             goto trunc;
 245
 246         /* XXX - Decode sub messages for each message */
 247         switch(lwapp_control_header->msg_type) {
 248         case LWAPP_MSGTYPE_DISCOVERY_REQUEST:
 249         case LWAPP_MSGTYPE_DISCOVERY_RESPONSE:
 250         case LWAPP_MSGTYPE_JOIN_REQUEST:
 251         case LWAPP_MSGTYPE_JOIN_RESPONSE:
 252         case LWAPP_MSGTYPE_JOIN_ACK:
 253         case LWAPP_MSGTYPE_JOIN_CONFIRM:
 254         case LWAPP_MSGTYPE_CONFIGURE_REQUEST:
 255         case LWAPP_MSGTYPE_CONFIGURE_RESPONSE:
 256         case LWAPP_MSGTYPE_CONF_UPDATE_REQUEST:
 257         case LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE:
 258         case LWAPP_MSGTYPE_WTP_EVENT_REQUEST:
 259         case LWAPP_MSGTYPE_WTP_EVENT_RESPONSE:
 260         case LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST:
 261         case LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE:
 262         case LWAPP_MSGTYPE_ECHO_REQUEST:
 263         case LWAPP_MSGTYPE_ECHO_RESPONSE:
 264         case LWAPP_MSGTYPE_IMAGE_DATA_REQUEST:
 265         case LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE:
 266         case LWAPP_MSGTYPE_RESET_REQUEST:
 267         case LWAPP_MSGTYPE_RESET_RESPONSE:
 268         case LWAPP_MSGTYPE_KEY_UPDATE_REQUEST:
 269         case LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE:
 270         case LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST:
 271         case LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE:
 272         case LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST:
 273         case LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE:
 274         case LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION:
 275         case LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST:
 276         case LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE:
 277         case LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST:
 278         case LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE:
 279         default:
 280             break;
 281         }
 282
 283         tptr += sizeof(struct lwapp_control_header) + msg_tlen;
 284         tlen -= sizeof(struct lwapp_control_header) + msg_tlen;
 285     }
 286     return;
 287
 288  trunc:
 289     printf("\n\t\t packet exceeded snapshot");
 290 }
 291
 292 void
 293 lwapp_data_print(const u_char *pptr, u_int len) {
 294
 295     const struct lwapp_transport_header *lwapp_trans_header;
 296     const u_char *tptr;
 297     int tlen;
 298
 299     tptr=pptr;
 300
 301     /* check if enough bytes for AP identity */
 302     if (!TTEST2(*tptr, 6))
 303         goto trunc;
 304     lwapp_trans_header = (const struct lwapp_transport_header *)pptr;
 305     TCHECK(*lwapp_trans_header);
 306
 307     /*
 308      * Sanity checking of the header.
 309      */
 310     if (LWAPP_EXTRACT_VERSION(lwapp_trans_header->version) != LWAPP_VERSION) {
 311         printf("LWAPP version %u packet not supported",
 312                LWAPP_EXTRACT_VERSION(lwapp_trans_header->version));
 313         return;
 314     }
 315
 316     /* non-verbose */
 317     if (vflag < 1) {
 318         printf("LWAPPv%u, %s frame, Flags [%s], length %u",
 319                LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
 320                LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
 321                bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
 322                len);
 323         return;
 324     }
 325
 326     /* ok they seem to want to know everything - lets fully decode it */
 327     tlen=EXTRACT_16BITS(lwapp_trans_header->length);
 328
 329     printf("LWAPPv%u, %s frame, Radio-id  %u, Flags [%s], Frag-id  %u, length %u",
 330            LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
 331            LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
 332            LWAPP_EXTRACT_RID(lwapp_trans_header->version),
 333            bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
 334            lwapp_trans_header->frag_id,
 335            tlen);
 336
 337     tptr+=sizeof(const struct lwapp_transport_header);
 338     tlen-=sizeof(const struct lwapp_transport_header);
 339
 340     /* FIX - An IEEE 802.11 frame follows - hexdump for now */
 341     print_unknown_data(gndo,tptr, "\n\t", tlen);
 342
 343     return;
 344
 345  trunc:
 346     printf("\n\t\t packet exceeded snapshot");
 347 }
 348
 349 /*
 350  * Local Variables:
 351  * c-style: whitesmith
 352  * c-basic-offset: 8
 353  * End:
 354  */