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

   1 /*
   2  * Copyright (c) 1998-2004  Hannes Gredler <hannes@tcpdump.org>
   3  *      The TCPDUMP project
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code
   7  * distributions retain the above copyright notice and this paragraph
   8  * in its entirety, and (2) distributions including binary code include
   9  * the above copyright notice and this paragraph in its entirety in
  10  * the documentation or other materials provided with the distribution.
  11  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
  12  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
  13  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  14  * FOR A PARTICULAR PURPOSE.
  15  */
  16
  17 #ifndef lint
  18 static const char rcsid[] _U_ =
  19     "@(#) $Header: /tcpdump/master/tcpdump/print-eigrp.c,v 1.5 2004-05-12 22:22:40 hannes Exp $";
  20 #endif
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <tcpdump-stdinc.h>
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 #include "interface.h"
  33 #include "extract.h"
  34 #include "addrtoname.h"
  35
  36 /*
  37  * packet format documented at
  38  * http://www.rhyshaden.com/eigrp.htm
  39  */
  40
  41 struct eigrp_common_header {
  42     u_int8_t version;
  43     u_int8_t opcode;
  44     u_int8_t checksum[2];
  45     u_int8_t flags[4];
  46     u_int8_t seq[4];
  47     u_int8_t ack[4];
  48     u_int8_t asn[4];
  49 };
  50
  51 #define EIGRP_VERSION                        2
  52
  53 #define EIGRP_OPCODE_UPDATE                  1
  54 #define EIGRP_OPCODE_QUERY                   3
  55 #define EIGRP_OPCODE_REPLY                   4
  56 #define EIGRP_OPCODE_HELLO                   5
  57 #define EIGRP_OPCODE_IPXSAP                  6
  58 #define EIGRP_OPCODE_PROBE                   7
  59
  60 static const struct tok eigrp_opcode_values[] = {
  61     { EIGRP_OPCODE_UPDATE, "Update" },
  62     { EIGRP_OPCODE_QUERY, "Query" },
  63     { EIGRP_OPCODE_REPLY, "Reply" },
  64     { EIGRP_OPCODE_HELLO, "Hello" },
  65     { EIGRP_OPCODE_IPXSAP, "IPX SAP" },
  66     { EIGRP_OPCODE_PROBE, "Probe" },
  67     { 0, NULL}
  68 };
  69
  70 static const struct tok eigrp_common_header_flag_values[] = {
  71     { 0x01, "Init" },
  72     { 0x02, "Conditionally Received" },
  73     { 0, NULL}
  74 };
  75
  76 struct eigrp_tlv_header {
  77     u_int8_t type[2];
  78     u_int8_t length[2];
  79 };
  80
  81 #define EIGRP_TLV_GENERAL_PARM   0x0001
  82 #define EIGRP_TLV_AUTH           0x0002
  83 #define EIGRP_TLV_SEQ            0x0003
  84 #define EIGRP_TLV_SW_VERSION     0x0004
  85 #define EIGRP_TLV_MCAST_SEQ      0x0005
  86 #define EIGRP_TLV_IP_INT         0x0102
  87 #define EIGRP_TLV_IP_EXT         0x0103
  88 #define EIGRP_TLV_AT_INT         0x0202
  89 #define EIGRP_TLV_AT_EXT         0x0203
  90 #define EIGRP_TLV_AT_CABLE_SETUP 0x0204
  91 #define EIGRP_TLV_IPX_INT        0x0302
  92 #define EIGRP_TLV_IPX_EXT        0x0303
  93
  94 static const struct tok eigrp_tlv_values[] = {
  95     { EIGRP_TLV_GENERAL_PARM, "General Parameters"},
  96     { EIGRP_TLV_AUTH, "Authentication"},
  97     { EIGRP_TLV_SEQ, "Sequence"},
  98     { EIGRP_TLV_SW_VERSION, "Software Version"},
  99     { EIGRP_TLV_MCAST_SEQ, "Next Multicast Sequence"},
 100     { EIGRP_TLV_IP_INT, "IP Internal routes"},
 101     { EIGRP_TLV_IP_EXT, "IP External routes"},
 102     { EIGRP_TLV_AT_INT, "AppleTalk Internal routes"},
 103     { EIGRP_TLV_AT_EXT, "AppleTalk External routes"},
 104     { EIGRP_TLV_AT_CABLE_SETUP, "AppleTalk Cable setup"},
 105     { EIGRP_TLV_IPX_INT, "IPX Internal routes"},
 106     { EIGRP_TLV_IPX_EXT, "IPX External routes"},
 107     { 0, NULL}
 108 };
 109
 110 struct eigrp_tlv_general_parm_t {
 111     u_int8_t k1;
 112     u_int8_t k2;
 113     u_int8_t k3;
 114     u_int8_t k4;
 115     u_int8_t k5;
 116     u_int8_t res;
 117     u_int8_t holdtime[2];
 118 };
 119
 120 struct eigrp_tlv_sw_version_t {
 121     u_int8_t ios_major;
 122     u_int8_t ios_minor;
 123     u_int8_t eigrp_major;
 124     u_int8_t eigrp_minor;
 125 };
 126
 127 struct eigrp_tlv_ip_int_t {
 128     u_int8_t nexthop[4];
 129     u_int8_t delay[4];
 130     u_int8_t bandwidth[4];
 131     u_int8_t mtu[3];
 132     u_int8_t hopcount;
 133     u_int8_t reliability;
 134     u_int8_t load;
 135     u_int8_t reserved[2];
 136     u_int8_t plen;
 137     u_int8_t destination; /* variable length [1-4] bytes encoding */
 138 };
 139
 140 struct eigrp_tlv_ip_ext_t {
 141     u_int8_t nexthop[4];
 142     u_int8_t origin_router[4];
 143     u_int8_t origin_as[4];
 144     u_int8_t tag[4];
 145     u_int8_t metric[4];
 146     u_int8_t reserved[2];
 147     u_int8_t proto_id;
 148     u_int8_t flags;
 149     u_int8_t delay[4];
 150     u_int8_t bandwidth[4];
 151     u_int8_t mtu[3];
 152     u_int8_t hopcount;
 153     u_int8_t reliability;
 154     u_int8_t load;
 155     u_int8_t reserved2[2];
 156     u_int8_t plen;
 157     u_int8_t destination; /* variable length [1-4] bytes encoding */
 158 };
 159
 160 struct eigrp_tlv_at_cable_setup_t {
 161     u_int8_t cable_start[2];
 162     u_int8_t cable_end[2];
 163     u_int8_t router_id[4];
 164 };
 165
 166 struct eigrp_tlv_at_int_t {
 167     u_int8_t nexthop[4];
 168     u_int8_t delay[4];
 169     u_int8_t bandwidth[4];
 170     u_int8_t mtu[3];
 171     u_int8_t hopcount;
 172     u_int8_t reliability;
 173     u_int8_t load;
 174     u_int8_t reserved[2];
 175     u_int8_t cable_start[2];
 176     u_int8_t cable_end[2];
 177 };
 178
 179 struct eigrp_tlv_at_ext_t {
 180     u_int8_t nexthop[4];
 181     u_int8_t origin_router[4];
 182     u_int8_t origin_as[4];
 183     u_int8_t tag[4];
 184     u_int8_t proto_id;
 185     u_int8_t flags;
 186     u_int8_t metric[2];
 187     u_int8_t delay[4];
 188     u_int8_t bandwidth[4];
 189     u_int8_t mtu[3];
 190     u_int8_t hopcount;
 191     u_int8_t reliability;
 192     u_int8_t load;
 193     u_int8_t reserved2[2];
 194     u_int8_t cable_start[2];
 195     u_int8_t cable_end[2];
 196 };
 197
 198 static const struct tok eigrp_ext_proto_id_values[] = {
 199     { 0x01, "IGRP" },
 200     { 0x02, "EIGRP" },
 201     { 0x03, "Static" },
 202     { 0x04, "RIP" },
 203     { 0x05, "Hello" },
 204     { 0x06, "OSPF" },
 205     { 0x07, "IS-IS" },
 206     { 0x08, "EGP" },
 207     { 0x09, "BGP" },
 208     { 0x0a, "IDRP" },
 209     { 0x0b, "Connected" },
 210     { 0, NULL}
 211 };
 212
 213 void
 214 eigrp_print(register const u_char *pptr, register u_int len) {
 215
 216     const struct eigrp_common_header *eigrp_com_header;
 217     const struct eigrp_tlv_header *eigrp_tlv_header;
 218     const u_char *tptr,*tlv_tptr;
 219     int tlen,eigrp_tlv_len,eigrp_tlv_type,tlv_tlen,byte_length, bit_length;
 220     u_int8_t prefix[4];
 221
 222     union {
 223         const struct eigrp_tlv_general_parm_t *eigrp_tlv_general_parm;
 224         const struct eigrp_tlv_sw_version_t *eigrp_tlv_sw_version;
 225         const struct eigrp_tlv_ip_int_t *eigrp_tlv_ip_int;
 226         const struct eigrp_tlv_ip_ext_t *eigrp_tlv_ip_ext;
 227         const struct eigrp_tlv_at_cable_setup_t *eigrp_tlv_at_cable_setup;
 228         const struct eigrp_tlv_at_int_t *eigrp_tlv_at_int;
 229         const struct eigrp_tlv_at_ext_t *eigrp_tlv_at_ext;
 230     } tlv_ptr;
 231
 232     tptr=pptr;
 233     eigrp_com_header = (const struct eigrp_common_header *)pptr;
 234     TCHECK(*eigrp_com_header);
 235
 236     /*
 237      * Sanity checking of the header.
 238      */
 239     if (eigrp_com_header->version != EIGRP_VERSION) {
 240         printf("EIGRP version %u packet not supported",eigrp_com_header->version);
 241         return;
 242     }
 243
 244     /* in non-verbose mode just lets print the basic Message Type*/
 245     if (vflag < 1) {
 246         printf("EIGRP %s, length: %u",
 247                tok2str(eigrp_opcode_values, "unknown (%u)",eigrp_com_header->opcode),
 248                len);
 249         return;
 250     }
 251
 252     /* ok they seem to want to know everything - lets fully decode it */
 253
 254     tlen=len-sizeof(struct eigrp_common_header);
 255
 256     /* FIXME print other header info */
 257     printf("\n\tEIGRP v%u, opcode: %s (%u), chksum: 0x%04x, Flags: [%s]\n\tseq: 0x%08x, ack: 0x%08x, AS: %u, length: %u",
 258            eigrp_com_header->version,
 259            tok2str(eigrp_opcode_values, "unknown, type: %u",eigrp_com_header->opcode),
 260            eigrp_com_header->opcode,
 261            EXTRACT_16BITS(&eigrp_com_header->checksum),
 262            tok2str(eigrp_common_header_flag_values,
 263                    "none",
 264                    EXTRACT_32BITS(&eigrp_com_header->flags)),
 265            EXTRACT_32BITS(&eigrp_com_header->seq),
 266            EXTRACT_32BITS(&eigrp_com_header->ack),
 267            EXTRACT_32BITS(&eigrp_com_header->asn),
 268            tlen);
 269
 270     tptr+=sizeof(const struct eigrp_common_header);
 271
 272     while(tlen>0) {
 273         /* did we capture enough for fully decoding the object header ? */
 274         if (!TTEST2(*tptr, sizeof(struct eigrp_tlv_header)))
 275             goto trunc;
 276
 277         eigrp_tlv_header = (const struct eigrp_tlv_header *)tptr;
 278         eigrp_tlv_len=EXTRACT_16BITS(&eigrp_tlv_header->length);
 279         eigrp_tlv_type=EXTRACT_16BITS(&eigrp_tlv_header->type);
 280
 281
 282         if (eigrp_tlv_len == 0 || eigrp_tlv_len > tlen) {
 283             print_unknown_data(tptr+sizeof(sizeof(struct eigrp_tlv_header)),"\n\t    ",tlen);
 284             return;
 285         }
 286
 287         printf("\n\t  %s TLV (0x%04x), length: %u",
 288                tok2str(eigrp_tlv_values,
 289                        "Unknown",
 290                        eigrp_tlv_type),
 291                eigrp_tlv_type,
 292                eigrp_tlv_len);
 293
 294         tlv_tptr=tptr+sizeof(struct eigrp_tlv_header);
 295         tlv_tlen=eigrp_tlv_len-sizeof(struct eigrp_tlv_header);
 296
 297         /* did we capture enough for fully decoding the object ? */
 298         if (!TTEST2(*tptr, eigrp_tlv_len))
 299             goto trunc;
 300
 301         switch(eigrp_tlv_type) {
 302
 303         case EIGRP_TLV_GENERAL_PARM:
 304             tlv_ptr.eigrp_tlv_general_parm = (const struct eigrp_tlv_general_parm_t *)tlv_tptr;
 305
 306             printf("\n\t    holdtime: %us, k1 %u, k2 %u, k3 %u, k4 %u, k5 %u",
 307                    EXTRACT_16BITS(tlv_ptr.eigrp_tlv_general_parm->holdtime),
 308                    tlv_ptr.eigrp_tlv_general_parm->k1,
 309                    tlv_ptr.eigrp_tlv_general_parm->k2,
 310                    tlv_ptr.eigrp_tlv_general_parm->k3,
 311                    tlv_ptr.eigrp_tlv_general_parm->k4,
 312                    tlv_ptr.eigrp_tlv_general_parm->k5);
 313             break;
 314
 315         case EIGRP_TLV_SW_VERSION:
 316             tlv_ptr.eigrp_tlv_sw_version = (const struct eigrp_tlv_sw_version_t *)tlv_tptr;
 317
 318             printf("\n\t    IOS version: %u.%u, EIGRP version %u.%u",
 319                    tlv_ptr.eigrp_tlv_sw_version->ios_major,
 320                    tlv_ptr.eigrp_tlv_sw_version->ios_minor,
 321                    tlv_ptr.eigrp_tlv_sw_version->eigrp_major,
 322                    tlv_ptr.eigrp_tlv_sw_version->eigrp_minor);
 323             break;
 324
 325         case EIGRP_TLV_IP_INT:
 326             tlv_ptr.eigrp_tlv_ip_int = (const struct eigrp_tlv_ip_int_t *)tlv_tptr;
 327
 328             bit_length = tlv_ptr.eigrp_tlv_ip_int->plen;
 329             if (bit_length < 0 || bit_length > 32) {
 330                 printf("\n\t    illegal prefix length %u",bit_length);
 331                 break;
 332             }
 333             byte_length = (bit_length + 7) / 8; /* variable length encoding */
 334             memset(prefix, 0, 4);
 335             memcpy(prefix,&tlv_ptr.eigrp_tlv_ip_int->destination,byte_length);
 336
 337             printf("\n\t    IPv4 prefix: %15s/%u, nexthop: ",
 338                    ipaddr_string(prefix),
 339                    bit_length);
 340             if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->nexthop) == 0)
 341                 printf("self");
 342             else
 343                 printf("%s",ipaddr_string(EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->nexthop)));
 344
 345             printf("\n\t      delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
 346                    (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->delay)/100),
 347                    EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->bandwidth),
 348                    EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_ip_int->mtu),
 349                    tlv_ptr.eigrp_tlv_ip_int->hopcount,
 350                    tlv_ptr.eigrp_tlv_ip_int->reliability,
 351                    tlv_ptr.eigrp_tlv_ip_int->load);
 352             break;
 353
 354         case EIGRP_TLV_IP_EXT:
 355             tlv_ptr.eigrp_tlv_ip_ext = (const struct eigrp_tlv_ip_ext_t *)tlv_tptr;
 356
 357             bit_length = tlv_ptr.eigrp_tlv_ip_ext->plen;
 358             if (bit_length < 0 || bit_length > 32) {
 359                 printf("\n\t    illegal prefix length %u",bit_length);
 360                 break;
 361             }
 362             byte_length = (bit_length + 7) / 8; /* variable length encoding */
 363             memset(prefix, 0, 4);
 364             memcpy(prefix,&tlv_ptr.eigrp_tlv_ip_ext->destination,byte_length);
 365
 366             printf("\n\t    IPv4 prefix: %15s/%u, nexthop: ",
 367                    ipaddr_string(prefix),
 368                    bit_length);
 369             if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->nexthop) == 0)
 370                 printf("self");
 371             else
 372                 printf("%s",ipaddr_string(EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->nexthop)));
 373
 374             printf("\n\t      origin-router %s, origin-as %u, origin-proto %s, flags [0x%02x], tag 0x%08x, metric %u",
 375                    ipaddr_string(tlv_ptr.eigrp_tlv_ip_ext->origin_router),
 376                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_ip_ext->origin_as),
 377                    tok2str(eigrp_ext_proto_id_values,"unknown",tlv_ptr.eigrp_tlv_ip_ext->proto_id),
 378                    tlv_ptr.eigrp_tlv_ip_ext->flags,
 379                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_ip_ext->tag),
 380                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_ip_ext->metric));
 381
 382             printf("\n\t      delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
 383                    (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->delay)/100),
 384                    EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->bandwidth),
 385                    EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_ip_ext->mtu),
 386                    tlv_ptr.eigrp_tlv_ip_ext->hopcount,
 387                    tlv_ptr.eigrp_tlv_ip_ext->reliability,
 388                    tlv_ptr.eigrp_tlv_ip_ext->load);
 389             break;
 390
 391         case EIGRP_TLV_AT_CABLE_SETUP:
 392             tlv_ptr.eigrp_tlv_at_cable_setup = (const struct eigrp_tlv_at_cable_setup_t *)tlv_tptr;
 393
 394             printf("\n\t    Cable-range: %u-%u, Router-ID %u",
 395                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_cable_setup->cable_start),
 396                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_cable_setup->cable_end),
 397                    EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_cable_setup->router_id));
 398             break;
 399
 400         case EIGRP_TLV_AT_INT:
 401             tlv_ptr.eigrp_tlv_at_int = (const struct eigrp_tlv_at_int_t *)tlv_tptr;
 402
 403             printf("\n\t     Cable-Range: %u-%u, nexthop: ",
 404                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->cable_start),
 405                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->cable_end));
 406
 407             if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_int->nexthop) == 0)
 408                 printf("self");
 409             else
 410                 printf("%u.%u",
 411                        EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->nexthop),
 412                        EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->nexthop[2]));
 413
 414             printf("\n\t      delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
 415                    (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_int->delay)/100),
 416                    EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_int->bandwidth),
 417                    EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_at_int->mtu),
 418                    tlv_ptr.eigrp_tlv_at_int->hopcount,
 419                    tlv_ptr.eigrp_tlv_at_int->reliability,
 420                    tlv_ptr.eigrp_tlv_at_int->load);
 421             break;
 422
 423         case EIGRP_TLV_AT_EXT:
 424             tlv_ptr.eigrp_tlv_at_ext = (const struct eigrp_tlv_at_ext_t *)tlv_tptr;
 425
 426             printf("\n\t     Cable-Range: %u-%u, nexthop: ",
 427                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->cable_start),
 428                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->cable_end));
 429
 430             if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_ext->nexthop) == 0)
 431                 printf("self");
 432             else
 433                 printf("%u.%u",
 434                        EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->nexthop),
 435                        EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->nexthop[2]));
 436
 437             printf("\n\t      origin-router %u, origin-as %u, origin-proto %s, flags [0x%02x], tag 0x%08x, metric %u",
 438                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_at_ext->origin_router),
 439                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_at_ext->origin_as),
 440                    tok2str(eigrp_ext_proto_id_values,"unknown",tlv_ptr.eigrp_tlv_at_ext->proto_id),
 441                    tlv_ptr.eigrp_tlv_at_ext->flags,
 442                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_at_ext->tag),
 443                    EXTRACT_16BITS(tlv_ptr.eigrp_tlv_at_ext->metric));
 444
 445             printf("\n\t      delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
 446                    (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_ext->delay)/100),
 447                    EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_ext->bandwidth),
 448                    EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_at_ext->mtu),
 449                    tlv_ptr.eigrp_tlv_at_ext->hopcount,
 450                    tlv_ptr.eigrp_tlv_at_ext->reliability,
 451                    tlv_ptr.eigrp_tlv_at_ext->load);
 452             break;
 453
 454             /*
 455              * FIXME those are the defined TLVs that lack a decoder
 456              * you are welcome to contribute code ;-)
 457              */
 458
 459         case EIGRP_TLV_AUTH:
 460         case EIGRP_TLV_SEQ:
 461         case EIGRP_TLV_MCAST_SEQ:
 462         case EIGRP_TLV_IPX_INT:
 463         case EIGRP_TLV_IPX_EXT:
 464
 465         default:
 466             if (vflag <= 1)
 467                 print_unknown_data(tlv_tptr,"\n\t    ",tlv_tlen);
 468             break;
 469         }
 470         /* do we want to see an additionally hexdump ? */
 471         if (vflag > 1)
 472             print_unknown_data(tptr+sizeof(sizeof(struct eigrp_tlv_header)),"\n\t    ",
 473                                eigrp_tlv_len-sizeof(struct eigrp_tlv_header));
 474
 475         tptr+=eigrp_tlv_len;
 476         tlen-=eigrp_tlv_len;
 477     }
 478     return;
 479 trunc:
 480     printf("\n\t\t packet exceeded snapshot");
 481 }