contrib/tcpdump/print-vtp.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  * VLAN TRUNKING PROTOCOL (VTP)
  16  *
  17  * Reference documentation:
  18  *  http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml
  19  *  http://www.cisco.com/warp/public/473/21.html
  20  *  http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
  21  *
  22  * Original code ode by Carles Kishimoto <carles.kishimoto@gmail.com>
  23  */
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include <tcpdump-stdinc.h>
  30
  31 #include <stdio.h>
  32 #include <string.h>
  33
  34 #include "interface.h"
  35 #include "addrtoname.h"
  36 #include "extract.h"
  37 #include "nlpid.h"
  38
  39 #define VTP_HEADER_LEN                  36
  40 #define VTP_DOMAIN_NAME_LEN             32
  41 #define VTP_MD5_DIGEST_LEN              16
  42 #define VTP_UPDATE_TIMESTAMP_LEN        12
  43 #define VTP_VLAN_INFO_OFFSET            12
  44
  45 #define VTP_SUMMARY_ADV                 0x01
  46 #define VTP_SUBSET_ADV                  0x02
  47 #define VTP_ADV_REQUEST                 0x03
  48 #define VTP_JOIN_MESSAGE                0x04
  49
  50 struct vtp_vlan_ {
  51     u_int8_t  len;
  52     u_int8_t  status;
  53     u_int8_t  type;
  54     u_int8_t  name_len;
  55     u_int16_t vlanid;
  56     u_int16_t mtu;
  57     u_int32_t index;
  58 };
  59
  60 static struct tok vtp_message_type_values[] = {
  61     { VTP_SUMMARY_ADV, "Summary advertisement"},
  62     { VTP_SUBSET_ADV, "Subset advertisement"},
  63     { VTP_ADV_REQUEST, "Advertisement request"},
  64     { VTP_JOIN_MESSAGE, "Join message"},
  65     { 0, NULL }
  66 };
  67
  68 static struct tok vtp_header_values[] = {
  69     { 0x01, "Followers"}, /* On Summary advertisement, 3rd byte is Followers */
  70     { 0x02, "Seq number"}, /* On Subset  advertisement, 3rd byte is Sequence number */
  71     { 0x03, "Rsvd"}, /* On Adver. requests 3rd byte is Rsvd */
  72     { 0x04, "Rsvd"}, /* On Adver. requests 3rd byte is Rsvd */
  73     { 0, NULL }
  74 };
  75
  76 static struct tok vtp_vlan_type_values[] = {
  77     { 0x01, "Ethernet"},
  78     { 0x02, "FDDI"},
  79     { 0x03, "TrCRF"},
  80     { 0x04, "FDDI-net"},
  81     { 0x05, "TrBRF"},
  82     { 0, NULL }
  83 };
  84
  85 static struct tok vtp_vlan_status[] = {
  86     { 0x00, "Operational"},
  87     { 0x01, "Suspended"},
  88     { 0, NULL }
  89 };
  90
  91 #define VTP_VLAN_SOURCE_ROUTING_RING_NUMBER      0x01
  92 #define VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER    0x02
  93 #define VTP_VLAN_STP_TYPE                        0x03
  94 #define VTP_VLAN_PARENT_VLAN                     0x04
  95 #define VTP_VLAN_TRANS_BRIDGED_VLAN              0x05
  96 #define VTP_VLAN_PRUNING                         0x06
  97 #define VTP_VLAN_BRIDGE_TYPE                     0x07
  98 #define VTP_VLAN_ARP_HOP_COUNT                   0x08
  99 #define VTP_VLAN_STE_HOP_COUNT                   0x09
 100 #define VTP_VLAN_BACKUP_CRF_MODE                 0x0A
 101
 102 static struct tok vtp_vlan_tlv_values[] = {
 103     { VTP_VLAN_SOURCE_ROUTING_RING_NUMBER, "Source-Routing Ring Number TLV"},
 104     { VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER, "Source-Routing Bridge Number TLV"},
 105     { VTP_VLAN_STP_TYPE, "STP type TLV"},
 106     { VTP_VLAN_PARENT_VLAN, "Parent VLAN TLV"},
 107     { VTP_VLAN_TRANS_BRIDGED_VLAN, "Translationally bridged VLANs TLV"},
 108     { VTP_VLAN_PRUNING, "Pruning TLV"},
 109     { VTP_VLAN_BRIDGE_TYPE, "Bridge Type TLV"},
 110     { VTP_VLAN_ARP_HOP_COUNT, "Max ARP Hop Count TLV"},
 111     { VTP_VLAN_STE_HOP_COUNT, "Max STE Hop Count TLV"},
 112     { VTP_VLAN_BACKUP_CRF_MODE, "Backup CRF Mode TLV"},
 113     { 0,                                  NULL }
 114 };
 115
 116 static struct tok vtp_stp_type_values[] = {
 117     { 1, "SRT"},
 118     { 2, "SRB"},
 119     { 3, "Auto"},
 120     { 0, NULL }
 121 };
 122
 123 void
 124 vtp_print (const u_char *pptr, u_int length)
 125 {
 126     int type, len, tlv_len, tlv_value;
 127     const u_char *tptr;
 128     const struct vtp_vlan_ *vtp_vlan;
 129
 130     if (length < VTP_HEADER_LEN)
 131         goto trunc;
 132
 133     tptr = pptr;
 134
 135     if (!TTEST2(*tptr, VTP_HEADER_LEN))
 136         goto trunc;
 137
 138     type = *(tptr+1);
 139     printf("VTPv%u, Message %s (0x%02x), length %u",
 140            *tptr,
 141            tok2str(vtp_message_type_values,"Unknown message type", type),
 142            *(tptr+1),
 143            length);
 144
 145     /* In non-verbose mode, just print version and message type */
 146     if (vflag < 1) {
 147         return;
 148     }
 149
 150     /* verbose mode print all fields */
 151     printf("\n\tDomain name: %s, %s: %u",
 152            (tptr+4),
 153            tok2str(vtp_header_values,"Unknown",*(tptr+1)),
 154            *(tptr+2));
 155
 156     tptr += VTP_HEADER_LEN;
 157
 158     switch (type) {
 159
 160     case VTP_SUMMARY_ADV:
 161
 162         /*
 163          *  SUMMARY ADVERTISEMENT
 164          *
 165          *  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
 166          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 167          *  |     Version   |     Code      |    Followers  |    MmgtD Len  |
 168          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 169          *  |                    Management Domain Name                     |
 170          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 171          *  |                    Configuration revision number              |
 172          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 173          *  |                  Updater Identity IP address                  |
 174          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 175          *  |                    Update Timestamp (12 bytes)                |
 176          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 177          *  |                        MD5 digest (16 bytes)                  |
 178          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 179          *
 180          */
 181
 182         printf("\n\t  Config Rev %x, Updater %s",
 183                EXTRACT_32BITS(tptr),
 184                ipaddr_string(tptr+4));
 185         tptr += 8;
 186         printf(", Timestamp 0x%08x 0x%08x 0x%08x",
 187                EXTRACT_32BITS(tptr),
 188                EXTRACT_32BITS(tptr + 4),
 189                EXTRACT_32BITS(tptr + 8));
 190         tptr += VTP_UPDATE_TIMESTAMP_LEN;
 191         printf(", MD5 digest: %08x%08x%08x%08x",
 192                EXTRACT_32BITS(tptr),
 193                EXTRACT_32BITS(tptr + 4),
 194                EXTRACT_32BITS(tptr + 8),
 195                EXTRACT_32BITS(tptr + 12));
 196         tptr += VTP_MD5_DIGEST_LEN;
 197         break;
 198
 199     case VTP_SUBSET_ADV:
 200
 201         /*
 202          *  SUBSET ADVERTISEMENT
 203          *
 204          *  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
 205          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 206          *  |     Version   |     Code      |   Seq number  |    MmgtD Len  |
 207          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 208          *  |                    Management Domain Name                     |
 209          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 210          *  |                    Configuration revision number              |
 211          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 212          *  |                         VLAN info field 1                     |
 213          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 214          *  |                         ................                      |
 215          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 216          *  |                         VLAN info field N                     |
 217          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 218          *
 219          */
 220
 221         printf(", Config Rev %x", EXTRACT_32BITS(tptr));
 222
 223         /*
 224          *  VLAN INFORMATION
 225          *  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
 226          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 227          *  | V info len    |    Status     |  VLAN type    | VLAN name len |
 228          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 229          *  |       ISL vlan id             |            MTU size           |
 230          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 231          *  |                     802.10 index (SAID)                       |
 232          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 233          *  |                         VLAN name                             |
 234          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 235          *
 236          */
 237
 238         tptr += 4;
 239         while (tptr < (pptr+length)) {
 240
 241             len = *tptr;
 242             if (len == 0)
 243                 break;
 244
 245             if (!TTEST2(*tptr, len))
 246                 goto trunc;
 247
 248             vtp_vlan = (struct vtp_vlan_*)tptr;
 249             printf("\n\tVLAN info status %s, type %s, VLAN-id %u, MTU %u, SAID 0x%08x, Name %s",
 250                    tok2str(vtp_vlan_status,"Unknown",vtp_vlan->status),
 251                    tok2str(vtp_vlan_type_values,"Unknown",vtp_vlan->type),
 252                    EXTRACT_16BITS(&vtp_vlan->vlanid),
 253                    EXTRACT_16BITS(&vtp_vlan->mtu),
 254                    EXTRACT_32BITS(&vtp_vlan->index),
 255                    (tptr + VTP_VLAN_INFO_OFFSET));
 256
 257             /*
 258              * Vlan names are aligned to 32-bit boundaries.
 259              */
 260             len  -= VTP_VLAN_INFO_OFFSET + 4*((vtp_vlan->name_len + 3)/4);
 261             tptr += VTP_VLAN_INFO_OFFSET + 4*((vtp_vlan->name_len + 3)/4);
 262
 263             /* TLV information follows */
 264
 265             while (len > 0) {
 266
 267                 /*
 268                  * Cisco specs says 2 bytes for type + 2 bytes for length, take only 1
 269                  * See: http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
 270                  */
 271                 type = *tptr;
 272                 tlv_len = *(tptr+1);
 273
 274                 printf("\n\t\t%s (0x%04x) TLV",
 275                        tok2str(vtp_vlan_tlv_values, "Unknown", type),
 276                        type);
 277
 278                 /*
 279                  * infinite loop check
 280                  */
 281                 if (type == 0 || tlv_len == 0) {
 282                     return;
 283                 }
 284
 285                 if (!TTEST2(*tptr, tlv_len*2 +2))
 286                     goto trunc;
 287
 288                 tlv_value = EXTRACT_16BITS(tptr+2);
 289
 290                 switch (type) {
 291                 case VTP_VLAN_STE_HOP_COUNT:
 292                     printf(", %u", tlv_value);
 293                     break;
 294
 295                 case VTP_VLAN_PRUNING:
 296                     printf(", %s (%u)",
 297                            tlv_value == 1 ? "Enabled" : "Disabled",
 298                            tlv_value);
 299                     break;
 300
 301                 case VTP_VLAN_STP_TYPE:
 302                     printf(", %s (%u)",
 303                            tok2str(vtp_stp_type_values, "Unknown", tlv_value),
 304                            tlv_value);
 305                     break;
 306
 307                 case VTP_VLAN_BRIDGE_TYPE:
 308                     printf(", %s (%u)",
 309                            tlv_value == 1 ? "SRB" : "SRT",
 310                            tlv_value);
 311                     break;
 312
 313                 case VTP_VLAN_BACKUP_CRF_MODE:
 314                     printf(", %s (%u)",
 315                            tlv_value == 1 ? "Backup" : "Not backup",
 316                            tlv_value);
 317                     break;
 318
 319                     /*
 320                      * FIXME those are the defined TLVs that lack a decoder
 321                      * you are welcome to contribute code ;-)
 322                      */
 323
 324                 case VTP_VLAN_SOURCE_ROUTING_RING_NUMBER:
 325                 case VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER:
 326                 case VTP_VLAN_PARENT_VLAN:
 327                 case VTP_VLAN_TRANS_BRIDGED_VLAN:
 328                 case VTP_VLAN_ARP_HOP_COUNT:
 329                 default:
 330                     print_unknown_data(tptr, "\n\t\t  ", 2 + tlv_len*2);
 331                     break;
 332                 }
 333                 len -= 2 + tlv_len*2;
 334                 tptr += 2 + tlv_len*2;
 335             }
 336         }
 337         break;
 338
 339     case VTP_ADV_REQUEST:
 340
 341         /*
 342          *  ADVERTISEMENT REQUEST
 343          *
 344          *  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
 345          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 346          *  |     Version   |     Code      |   Reserved    |    MmgtD Len  |
 347          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 348          *  |                    Management Domain Name                     |
 349          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 350          *  |                          Start value                          |
 351          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 352          *
 353          */
 354
 355         printf("\n\tStart value: %u", EXTRACT_32BITS(tptr));
 356         break;
 357
 358     case VTP_JOIN_MESSAGE:
 359
 360         /* FIXME - Could not find message format */
 361         break;
 362
 363     default:
 364         break;
 365     }
 366
 367     return;
 368
 369  trunc:
 370     printf("[|vtp]");
 371 }
 372
 373 /*
 374  * Local Variables:
 375  * c-style: whitesmith
 376  * c-basic-offset: 4
 377  * End:
 378  */