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 #ifdef HAVE_CONFIG_H
  18 #include "config.h"
  19 #endif
  20
  21 #include <netdissect-stdinc.h>
  22
  23 #include <string.h>
  24
  25 #include "netdissect.h"
  26 #include "extract.h"
  27 #include "addrtoname.h"
  28
  29 /*
  30  * packet format documented at
  31  * http://www.rhyshaden.com/eigrp.htm
  32  */
  33
  34 struct eigrp_common_header {
  35     uint8_t version;
  36     uint8_t opcode;
  37     uint8_t checksum[2];
  38     uint8_t flags[4];
  39     uint8_t seq[4];
  40     uint8_t ack[4];
  41     uint8_t asn[4];
  42 };
  43
  44 #define EIGRP_VERSION                        2
  45
  46 #define EIGRP_OPCODE_UPDATE                  1
  47 #define EIGRP_OPCODE_QUERY                   3
  48 #define EIGRP_OPCODE_REPLY                   4
  49 #define EIGRP_OPCODE_HELLO                   5
  50 #define EIGRP_OPCODE_IPXSAP                  6
  51 #define EIGRP_OPCODE_PROBE                   7
  52
  53 static const struct tok eigrp_opcode_values[] = {
  54     { EIGRP_OPCODE_UPDATE, "Update" },
  55     { EIGRP_OPCODE_QUERY, "Query" },
  56     { EIGRP_OPCODE_REPLY, "Reply" },
  57     { EIGRP_OPCODE_HELLO, "Hello" },
  58     { EIGRP_OPCODE_IPXSAP, "IPX SAP" },
  59     { EIGRP_OPCODE_PROBE, "Probe" },
  60     { 0, NULL}
  61 };
  62
  63 static const struct tok eigrp_common_header_flag_values[] = {
  64     { 0x01, "Init" },
  65     { 0x02, "Conditionally Received" },
  66     { 0, NULL}
  67 };
  68
  69 struct eigrp_tlv_header {
  70     uint8_t type[2];
  71     uint8_t length[2];
  72 };
  73
  74 #define EIGRP_TLV_GENERAL_PARM   0x0001
  75 #define EIGRP_TLV_AUTH           0x0002
  76 #define EIGRP_TLV_SEQ            0x0003
  77 #define EIGRP_TLV_SW_VERSION     0x0004
  78 #define EIGRP_TLV_MCAST_SEQ      0x0005
  79 #define EIGRP_TLV_IP_INT         0x0102
  80 #define EIGRP_TLV_IP_EXT         0x0103
  81 #define EIGRP_TLV_AT_INT         0x0202
  82 #define EIGRP_TLV_AT_EXT         0x0203
  83 #define EIGRP_TLV_AT_CABLE_SETUP 0x0204
  84 #define EIGRP_TLV_IPX_INT        0x0302
  85 #define EIGRP_TLV_IPX_EXT        0x0303
  86
  87 static const struct tok eigrp_tlv_values[] = {
  88     { EIGRP_TLV_GENERAL_PARM, "General Parameters"},
  89     { EIGRP_TLV_AUTH, "Authentication"},
  90     { EIGRP_TLV_SEQ, "Sequence"},
  91     { EIGRP_TLV_SW_VERSION, "Software Version"},
  92     { EIGRP_TLV_MCAST_SEQ, "Next Multicast Sequence"},
  93     { EIGRP_TLV_IP_INT, "IP Internal routes"},
  94     { EIGRP_TLV_IP_EXT, "IP External routes"},
  95     { EIGRP_TLV_AT_INT, "AppleTalk Internal routes"},
  96     { EIGRP_TLV_AT_EXT, "AppleTalk External routes"},
  97     { EIGRP_TLV_AT_CABLE_SETUP, "AppleTalk Cable setup"},
  98     { EIGRP_TLV_IPX_INT, "IPX Internal routes"},
  99     { EIGRP_TLV_IPX_EXT, "IPX External routes"},
 100     { 0, NULL}
 101 };
 102
 103 struct eigrp_tlv_general_parm_t {
 104     uint8_t k1;
 105     uint8_t k2;
 106     uint8_t k3;
 107     uint8_t k4;
 108     uint8_t k5;
 109     uint8_t res;
 110     uint8_t holdtime[2];
 111 };
 112
 113 struct eigrp_tlv_sw_version_t {
 114     uint8_t ios_major;
 115     uint8_t ios_minor;
 116     uint8_t eigrp_major;
 117     uint8_t eigrp_minor;
 118 };
 119
 120 struct eigrp_tlv_ip_int_t {
 121     uint8_t nexthop[4];
 122     uint8_t delay[4];
 123     uint8_t bandwidth[4];
 124     uint8_t mtu[3];
 125     uint8_t hopcount;
 126     uint8_t reliability;
 127     uint8_t load;
 128     uint8_t reserved[2];
 129     uint8_t plen;
 130     uint8_t destination; /* variable length [1-4] bytes encoding */
 131 };
 132
 133 struct eigrp_tlv_ip_ext_t {
 134     uint8_t nexthop[4];
 135     uint8_t origin_router[4];
 136     uint8_t origin_as[4];
 137     uint8_t tag[4];
 138     uint8_t metric[4];
 139     uint8_t reserved[2];
 140     uint8_t proto_id;
 141     uint8_t flags;
 142     uint8_t delay[4];
 143     uint8_t bandwidth[4];
 144     uint8_t mtu[3];
 145     uint8_t hopcount;
 146     uint8_t reliability;
 147     uint8_t load;
 148     uint8_t reserved2[2];
 149     uint8_t plen;
 150     uint8_t destination; /* variable length [1-4] bytes encoding */
 151 };
 152
 153 struct eigrp_tlv_at_cable_setup_t {
 154     uint8_t cable_start[2];
 155     uint8_t cable_end[2];
 156     uint8_t router_id[4];
 157 };
 158
 159 struct eigrp_tlv_at_int_t {
 160     uint8_t nexthop[4];
 161     uint8_t delay[4];
 162     uint8_t bandwidth[4];
 163     uint8_t mtu[3];
 164     uint8_t hopcount;
 165     uint8_t reliability;
 166     uint8_t load;
 167     uint8_t reserved[2];
 168     uint8_t cable_start[2];
 169     uint8_t cable_end[2];
 170 };
 171
 172 struct eigrp_tlv_at_ext_t {
 173     uint8_t nexthop[4];
 174     uint8_t origin_router[4];
 175     uint8_t origin_as[4];
 176     uint8_t tag[4];
 177     uint8_t proto_id;
 178     uint8_t flags;
 179     uint8_t metric[2];
 180     uint8_t delay[4];
 181     uint8_t bandwidth[4];
 182     uint8_t mtu[3];
 183     uint8_t hopcount;
 184     uint8_t reliability;
 185     uint8_t load;
 186     uint8_t reserved2[2];
 187     uint8_t cable_start[2];
 188     uint8_t cable_end[2];
 189 };
 190
 191 static const struct tok eigrp_ext_proto_id_values[] = {
 192     { 0x01, "IGRP" },
 193     { 0x02, "EIGRP" },
 194     { 0x03, "Static" },
 195     { 0x04, "RIP" },
 196     { 0x05, "Hello" },
 197     { 0x06, "OSPF" },
 198     { 0x07, "IS-IS" },
 199     { 0x08, "EGP" },
 200     { 0x09, "BGP" },
 201     { 0x0a, "IDRP" },
 202     { 0x0b, "Connected" },
 203     { 0, NULL}
 204 };
 205
 206 void
 207 eigrp_print(netdissect_options *ndo, register const u_char *pptr, register u_int len)
 208 {
 209     const struct eigrp_common_header *eigrp_com_header;
 210     const struct eigrp_tlv_header *eigrp_tlv_header;
 211     const u_char *tptr,*tlv_tptr;
 212     u_int tlen,eigrp_tlv_len,eigrp_tlv_type,tlv_tlen, byte_length, bit_length;
 213     uint8_t prefix[4];
 214
 215     union {
 216         const struct eigrp_tlv_general_parm_t *eigrp_tlv_general_parm;
 217         const struct eigrp_tlv_sw_version_t *eigrp_tlv_sw_version;
 218         const struct eigrp_tlv_ip_int_t *eigrp_tlv_ip_int;
 219         const struct eigrp_tlv_ip_ext_t *eigrp_tlv_ip_ext;
 220         const struct eigrp_tlv_at_cable_setup_t *eigrp_tlv_at_cable_setup;
 221         const struct eigrp_tlv_at_int_t *eigrp_tlv_at_int;
 222         const struct eigrp_tlv_at_ext_t *eigrp_tlv_at_ext;
 223     } tlv_ptr;
 224
 225     tptr=pptr;
 226     eigrp_com_header = (const struct eigrp_common_header *)pptr;
 227     ND_TCHECK(*eigrp_com_header);
 228
 229     /*
 230      * Sanity checking of the header.
 231      */
 232     if (eigrp_com_header->version != EIGRP_VERSION) {
 233         ND_PRINT((ndo, "EIGRP version %u packet not supported",eigrp_com_header->version));
 234         return;
 235     }
 236
 237     /* in non-verbose mode just lets print the basic Message Type*/
 238     if (ndo->ndo_vflag < 1) {
 239         ND_PRINT((ndo, "EIGRP %s, length: %u",
 240                tok2str(eigrp_opcode_values, "unknown (%u)",eigrp_com_header->opcode),
 241                len));
 242         return;
 243     }
 244
 245     /* ok they seem to want to know everything - lets fully decode it */
 246
 247     tlen=len-sizeof(struct eigrp_common_header);
 248
 249     /* FIXME print other header info */
 250     ND_PRINT((ndo, "\n\tEIGRP v%u, opcode: %s (%u), chksum: 0x%04x, Flags: [%s]\n\tseq: 0x%08x, ack: 0x%08x, AS: %u, length: %u",
 251            eigrp_com_header->version,
 252            tok2str(eigrp_opcode_values, "unknown, type: %u",eigrp_com_header->opcode),
 253            eigrp_com_header->opcode,
 254            EXTRACT_16BITS(&eigrp_com_header->checksum),
 255            tok2str(eigrp_common_header_flag_values,
 256                    "none",
 257                    EXTRACT_32BITS(&eigrp_com_header->flags)),
 258            EXTRACT_32BITS(&eigrp_com_header->seq),
 259            EXTRACT_32BITS(&eigrp_com_header->ack),
 260            EXTRACT_32BITS(&eigrp_com_header->asn),
 261            tlen));
 262
 263     tptr+=sizeof(const struct eigrp_common_header);
 264
 265     while(tlen>0) {
 266         /* did we capture enough for fully decoding the object header ? */
 267         ND_TCHECK2(*tptr, sizeof(struct eigrp_tlv_header));
 268
 269         eigrp_tlv_header = (const struct eigrp_tlv_header *)tptr;
 270         eigrp_tlv_len=EXTRACT_16BITS(&eigrp_tlv_header->length);
 271         eigrp_tlv_type=EXTRACT_16BITS(&eigrp_tlv_header->type);
 272
 273
 274         if (eigrp_tlv_len < sizeof(struct eigrp_tlv_header) ||
 275             eigrp_tlv_len > tlen) {
 276             print_unknown_data(ndo,tptr+sizeof(struct eigrp_tlv_header),"\n\t    ",tlen);
 277             return;
 278         }
 279
 280         ND_PRINT((ndo, "\n\t  %s TLV (0x%04x), length: %u",
 281                tok2str(eigrp_tlv_values,
 282                        "Unknown",
 283                        eigrp_tlv_type),
 284                eigrp_tlv_type,
 285                eigrp_tlv_len));
 286
 287         tlv_tptr=tptr+sizeof(struct eigrp_tlv_header);
 288         tlv_tlen=eigrp_tlv_len-sizeof(struct eigrp_tlv_header);
 289
 290         /* did we capture enough for fully decoding the object ? */
 291         ND_TCHECK2(*tptr, eigrp_tlv_len);
 292
 293         switch(eigrp_tlv_type) {
 294
 295         case EIGRP_TLV_GENERAL_PARM:
 296             tlv_ptr.eigrp_tlv_general_parm = (const struct eigrp_tlv_general_parm_t *)tlv_tptr;
 297
 298             ND_PRINT((ndo, "\n\t    holdtime: %us, k1 %u, k2 %u, k3 %u, k4 %u, k5 %u",
 299                    EXTRACT_16BITS(tlv_ptr.eigrp_tlv_general_parm->holdtime),
 300                    tlv_ptr.eigrp_tlv_general_parm->k1,
 301                    tlv_ptr.eigrp_tlv_general_parm->k2,
 302                    tlv_ptr.eigrp_tlv_general_parm->k3,
 303                    tlv_ptr.eigrp_tlv_general_parm->k4,
 304                    tlv_ptr.eigrp_tlv_general_parm->k5));
 305             break;
 306
 307         case EIGRP_TLV_SW_VERSION:
 308             tlv_ptr.eigrp_tlv_sw_version = (const struct eigrp_tlv_sw_version_t *)tlv_tptr;
 309
 310             ND_PRINT((ndo, "\n\t    IOS version: %u.%u, EIGRP version %u.%u",
 311                    tlv_ptr.eigrp_tlv_sw_version->ios_major,
 312                    tlv_ptr.eigrp_tlv_sw_version->ios_minor,
 313                    tlv_ptr.eigrp_tlv_sw_version->eigrp_major,
 314                    tlv_ptr.eigrp_tlv_sw_version->eigrp_minor));
 315             break;
 316
 317         case EIGRP_TLV_IP_INT:
 318             tlv_ptr.eigrp_tlv_ip_int = (const struct eigrp_tlv_ip_int_t *)tlv_tptr;
 319
 320             bit_length = tlv_ptr.eigrp_tlv_ip_int->plen;
 321             if (bit_length > 32) {
 322                 ND_PRINT((ndo, "\n\t    illegal prefix length %u",bit_length));
 323                 break;
 324             }
 325             byte_length = (bit_length + 7) / 8; /* variable length encoding */
 326             memset(prefix, 0, 4);
 327             memcpy(prefix,&tlv_ptr.eigrp_tlv_ip_int->destination,byte_length);
 328
 329             ND_PRINT((ndo, "\n\t    IPv4 prefix: %15s/%u, nexthop: ",
 330                    ipaddr_string(ndo, prefix),
 331                    bit_length));
 332             if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->nexthop) == 0)
 333                 ND_PRINT((ndo, "self"));
 334             else
 335                 ND_PRINT((ndo, "%s",ipaddr_string(ndo, &tlv_ptr.eigrp_tlv_ip_int->nexthop)));
 336
 337             ND_PRINT((ndo, "\n\t      delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
 338                    (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->delay)/100),
 339                    EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->bandwidth),
 340                    EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_ip_int->mtu),
 341                    tlv_ptr.eigrp_tlv_ip_int->hopcount,
 342                    tlv_ptr.eigrp_tlv_ip_int->reliability,
 343                    tlv_ptr.eigrp_tlv_ip_int->load));
 344             break;
 345
 346         case EIGRP_TLV_IP_EXT:
 347             tlv_ptr.eigrp_tlv_ip_ext = (const struct eigrp_tlv_ip_ext_t *)tlv_tptr;
 348
 349             bit_length = tlv_ptr.eigrp_tlv_ip_ext->plen;
 350             if (bit_length > 32) {
 351                 ND_PRINT((ndo, "\n\t    illegal prefix length %u",bit_length));
 352                 break;
 353             }
 354             byte_length = (bit_length + 7) / 8; /* variable length encoding */
 355             memset(prefix, 0, 4);
 356             memcpy(prefix,&tlv_ptr.eigrp_tlv_ip_ext->destination,byte_length);
 357
 358             ND_PRINT((ndo, "\n\t    IPv4 prefix: %15s/%u, nexthop: ",
 359                    ipaddr_string(ndo, prefix),
 360                    bit_length));
 361             if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->nexthop) == 0)
 362                 ND_PRINT((ndo, "self"));
 363             else
 364                 ND_PRINT((ndo, "%s",ipaddr_string(ndo, &tlv_ptr.eigrp_tlv_ip_ext->nexthop)));
 365
 366             ND_PRINT((ndo, "\n\t      origin-router %s, origin-as %u, origin-proto %s, flags [0x%02x], tag 0x%08x, metric %u",
 367                    ipaddr_string(ndo, tlv_ptr.eigrp_tlv_ip_ext->origin_router),
 368                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_ip_ext->origin_as),
 369                    tok2str(eigrp_ext_proto_id_values,"unknown",tlv_ptr.eigrp_tlv_ip_ext->proto_id),
 370                    tlv_ptr.eigrp_tlv_ip_ext->flags,
 371                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_ip_ext->tag),
 372                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_ip_ext->metric)));
 373
 374             ND_PRINT((ndo, "\n\t      delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
 375                    (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->delay)/100),
 376                    EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->bandwidth),
 377                    EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_ip_ext->mtu),
 378                    tlv_ptr.eigrp_tlv_ip_ext->hopcount,
 379                    tlv_ptr.eigrp_tlv_ip_ext->reliability,
 380                    tlv_ptr.eigrp_tlv_ip_ext->load));
 381             break;
 382
 383         case EIGRP_TLV_AT_CABLE_SETUP:
 384             tlv_ptr.eigrp_tlv_at_cable_setup = (const struct eigrp_tlv_at_cable_setup_t *)tlv_tptr;
 385
 386             ND_PRINT((ndo, "\n\t    Cable-range: %u-%u, Router-ID %u",
 387                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_cable_setup->cable_start),
 388                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_cable_setup->cable_end),
 389                    EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_cable_setup->router_id)));
 390             break;
 391
 392         case EIGRP_TLV_AT_INT:
 393             tlv_ptr.eigrp_tlv_at_int = (const struct eigrp_tlv_at_int_t *)tlv_tptr;
 394
 395             ND_PRINT((ndo, "\n\t     Cable-Range: %u-%u, nexthop: ",
 396                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->cable_start),
 397                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->cable_end)));
 398
 399             if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_int->nexthop) == 0)
 400                 ND_PRINT((ndo, "self"));
 401             else
 402                 ND_PRINT((ndo, "%u.%u",
 403                        EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->nexthop),
 404                        EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->nexthop[2])));
 405
 406             ND_PRINT((ndo, "\n\t      delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
 407                    (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_int->delay)/100),
 408                    EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_int->bandwidth),
 409                    EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_at_int->mtu),
 410                    tlv_ptr.eigrp_tlv_at_int->hopcount,
 411                    tlv_ptr.eigrp_tlv_at_int->reliability,
 412                    tlv_ptr.eigrp_tlv_at_int->load));
 413             break;
 414
 415         case EIGRP_TLV_AT_EXT:
 416             tlv_ptr.eigrp_tlv_at_ext = (const struct eigrp_tlv_at_ext_t *)tlv_tptr;
 417
 418             ND_PRINT((ndo, "\n\t     Cable-Range: %u-%u, nexthop: ",
 419                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->cable_start),
 420                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->cable_end)));
 421
 422             if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_ext->nexthop) == 0)
 423                 ND_PRINT((ndo, "self"));
 424             else
 425                 ND_PRINT((ndo, "%u.%u",
 426                        EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->nexthop),
 427                        EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->nexthop[2])));
 428
 429             ND_PRINT((ndo, "\n\t      origin-router %u, origin-as %u, origin-proto %s, flags [0x%02x], tag 0x%08x, metric %u",
 430                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_at_ext->origin_router),
 431                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_at_ext->origin_as),
 432                    tok2str(eigrp_ext_proto_id_values,"unknown",tlv_ptr.eigrp_tlv_at_ext->proto_id),
 433                    tlv_ptr.eigrp_tlv_at_ext->flags,
 434                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_at_ext->tag),
 435                    EXTRACT_16BITS(tlv_ptr.eigrp_tlv_at_ext->metric)));
 436
 437             ND_PRINT((ndo, "\n\t      delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
 438                    (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_ext->delay)/100),
 439                    EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_ext->bandwidth),
 440                    EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_at_ext->mtu),
 441                    tlv_ptr.eigrp_tlv_at_ext->hopcount,
 442                    tlv_ptr.eigrp_tlv_at_ext->reliability,
 443                    tlv_ptr.eigrp_tlv_at_ext->load));
 444             break;
 445
 446             /*
 447              * FIXME those are the defined TLVs that lack a decoder
 448              * you are welcome to contribute code ;-)
 449              */
 450
 451         case EIGRP_TLV_AUTH:
 452         case EIGRP_TLV_SEQ:
 453         case EIGRP_TLV_MCAST_SEQ:
 454         case EIGRP_TLV_IPX_INT:
 455         case EIGRP_TLV_IPX_EXT:
 456
 457         default:
 458             if (ndo->ndo_vflag <= 1)
 459                 print_unknown_data(ndo,tlv_tptr,"\n\t    ",tlv_tlen);
 460             break;
 461         }
 462         /* do we want to see an additionally hexdump ? */
 463         if (ndo->ndo_vflag > 1)
 464             print_unknown_data(ndo,tptr+sizeof(struct eigrp_tlv_header),"\n\t    ",
 465                                eigrp_tlv_len-sizeof(struct eigrp_tlv_header));
 466
 467         tptr+=eigrp_tlv_len;
 468         tlen-=eigrp_tlv_len;
 469     }
 470     return;
 471 trunc:
 472     ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 473 }