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

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 #ifndef lint
  23 static const char rcsid[] _U_ =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.159 2007-09-14 01:29:28 guy Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <tcpdump-stdinc.h>
  32
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36
  37 #include "addrtoname.h"
  38 #include "interface.h"
  39 #include "extract.h"                    /* must come after interface.h */
  40
  41 #include "ip.h"
  42 #include "ipproto.h"
  43
  44 static const char tstr[] = "[|ip]";
  45
  46 static const struct tok ip_option_values[] = {
  47     { IPOPT_EOL, "EOL" },
  48     { IPOPT_NOP, "NOP" },
  49     { IPOPT_TS, "timestamp" },
  50     { IPOPT_SECURITY, "security" },
  51     { IPOPT_RR, "RR" },
  52     { IPOPT_SSRR, "SSRR" },
  53     { IPOPT_LSRR, "LSRR" },
  54     { IPOPT_RA, "RA" },
  55     { IPOPT_RFC1393, "traceroute" },
  56     { 0, NULL }
  57 };
  58
  59 /*
  60  * print the recorded route in an IP RR, LSRR or SSRR option.
  61  */
  62 static void
  63 ip_printroute(register const u_char *cp, u_int length)
  64 {
  65         register u_int ptr;
  66         register u_int len;
  67
  68         if (length < 3) {
  69                 printf(" [bad length %u]", length);
  70                 return;
  71         }
  72         if ((length + 1) & 3)
  73                 printf(" [bad length %u]", length);
  74         ptr = cp[2] - 1;
  75         if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
  76                 printf(" [bad ptr %u]", cp[2]);
  77
  78         for (len = 3; len < length; len += 4) {
  79                 printf(" %s", ipaddr_string(&cp[len]));
  80                 if (ptr > len)
  81                         printf(",");
  82         }
  83 }
  84
  85 /*
  86  * If source-routing is present and valid, return the final destination.
  87  * Otherwise, return IP destination.
  88  *
  89  * This is used for UDP and TCP pseudo-header in the checksum
  90  * calculation.
  91  */
  92 static u_int32_t
  93 ip_finddst(const struct ip *ip)
  94 {
  95         int length;
  96         int len;
  97         const u_char *cp;
  98         u_int32_t retval;
  99
 100         cp = (const u_char *)(ip + 1);
 101         length = (IP_HL(ip) << 2) - sizeof(struct ip);
 102
 103         for (; length > 0; cp += len, length -= len) {
 104                 int tt;
 105
 106                 TCHECK(*cp);
 107                 tt = *cp;
 108                 if (tt == IPOPT_EOL)
 109                         break;
 110                 else if (tt == IPOPT_NOP)
 111                         len = 1;
 112                 else {
 113                         TCHECK(cp[1]);
 114                         len = cp[1];
 115                         if (len < 2)
 116                                 break;
 117                 }
 118                 TCHECK2(*cp, len);
 119                 switch (tt) {
 120
 121                 case IPOPT_SSRR:
 122                 case IPOPT_LSRR:
 123                         if (len < 7)
 124                                 break;
 125                         memcpy(&retval, cp + len - 4, 4);
 126                         return retval;
 127                 }
 128         }
 129 trunc:
 130         memcpy(&retval, &ip->ip_dst.s_addr, sizeof(u_int32_t));
 131         return retval;
 132 }
 133
 134 /*
 135  * Compute a V4-style checksum by building a pseudoheader.
 136  */
 137 int
 138 nextproto4_cksum(const struct ip *ip, const u_int8_t *data,
 139                  u_int len, u_int next_proto)
 140 {
 141         struct phdr {
 142                 u_int32_t src;
 143                 u_int32_t dst;
 144                 u_char mbz;
 145                 u_char proto;
 146                 u_int16_t len;
 147         } ph;
 148         struct cksum_vec vec[2];
 149
 150         /* pseudo-header.. */
 151         ph.len = htons((u_int16_t)len);
 152         ph.mbz = 0;
 153         ph.proto = next_proto;
 154         memcpy(&ph.src, &ip->ip_src.s_addr, sizeof(u_int32_t));
 155         if (IP_HL(ip) == 5)
 156                 memcpy(&ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t));
 157         else
 158                 ph.dst = ip_finddst(ip);
 159
 160         vec[0].ptr = (const u_int8_t *)(void *)&ph;
 161         vec[0].len = sizeof(ph);
 162         vec[1].ptr = data;
 163         vec[1].len = len;
 164         return (in_cksum(vec, 2));
 165 }
 166
 167 static void
 168 ip_printts(register const u_char *cp, u_int length)
 169 {
 170         register u_int ptr;
 171         register u_int len;
 172         int hoplen;
 173         const char *type;
 174
 175         if (length < 4) {
 176                 printf("[bad length %u]", length);
 177                 return;
 178         }
 179         printf(" TS{");
 180         hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
 181         if ((length - 4) & (hoplen-1))
 182                 printf("[bad length %u]", length);
 183         ptr = cp[2] - 1;
 184         len = 0;
 185         if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
 186                 printf("[bad ptr %u]", cp[2]);
 187         switch (cp[3]&0xF) {
 188         case IPOPT_TS_TSONLY:
 189                 printf("TSONLY");
 190                 break;
 191         case IPOPT_TS_TSANDADDR:
 192                 printf("TS+ADDR");
 193                 break;
 194         /*
 195          * prespecified should really be 3, but some ones might send 2
 196          * instead, and the IPOPT_TS_PRESPEC constant can apparently
 197          * have both values, so we have to hard-code it here.
 198          */
 199
 200         case 2:
 201                 printf("PRESPEC2.0");
 202                 break;
 203         case 3:                 /* IPOPT_TS_PRESPEC */
 204                 printf("PRESPEC");
 205                 break;
 206         default:
 207                 printf("[bad ts type %d]", cp[3]&0xF);
 208                 goto done;
 209         }
 210
 211         type = " ";
 212         for (len = 4; len < length; len += hoplen) {
 213                 if (ptr == len)
 214                         type = " ^ ";
 215                 printf("%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
 216                        hoplen!=8 ? "" : ipaddr_string(&cp[len]));
 217                 type = " ";
 218         }
 219
 220 done:
 221         printf("%s", ptr == len ? " ^ " : "");
 222
 223         if (cp[3]>>4)
 224                 printf(" [%d hops not recorded]} ", cp[3]>>4);
 225         else
 226                 printf("}");
 227 }
 228
 229 /*
 230  * print IP options.
 231  */
 232 static void
 233 ip_optprint(register const u_char *cp, u_int length)
 234 {
 235         register u_int option_len;
 236         const char *sep = "";
 237
 238         for (; length > 0; cp += option_len, length -= option_len) {
 239                 u_int option_code;
 240
 241                 printf("%s", sep);
 242                 sep = ",";
 243
 244                 TCHECK(*cp);
 245                 option_code = *cp;
 246
 247                 printf("%s",
 248                         tok2str(ip_option_values,"unknown %u",option_code));
 249
 250                 if (option_code == IPOPT_NOP ||
 251                     option_code == IPOPT_EOL)
 252                         option_len = 1;
 253
 254                 else {
 255                         TCHECK(cp[1]);
 256                         option_len = cp[1];
 257                         if (option_len < 2) {
 258                                 printf(" [bad length %u]", option_len);
 259                                 return;
 260                         }
 261                 }
 262
 263                 if (option_len > length) {
 264                         printf(" [bad length %u]", option_len);
 265                         return;
 266                 }
 267
 268                 TCHECK2(*cp, option_len);
 269
 270                 switch (option_code) {
 271                 case IPOPT_EOL:
 272                         return;
 273
 274                 case IPOPT_TS:
 275                         ip_printts(cp, option_len);
 276                         break;
 277
 278                 case IPOPT_RR:       /* fall through */
 279                 case IPOPT_SSRR:
 280                 case IPOPT_LSRR:
 281                         ip_printroute(cp, option_len);
 282                         break;
 283
 284                 case IPOPT_RA:
 285                         if (option_len < 4) {
 286                                 printf(" [bad length %u]", option_len);
 287                                 break;
 288                         }
 289                         TCHECK(cp[3]);
 290                         if (EXTRACT_16BITS(&cp[2]) != 0)
 291                             printf(" value %u", EXTRACT_16BITS(&cp[2]));
 292                         break;
 293
 294                 case IPOPT_NOP:       /* nothing to print - fall through */
 295                 case IPOPT_SECURITY:
 296                 default:
 297                         break;
 298                 }
 299         }
 300         return;
 301
 302 trunc:
 303         printf("%s", tstr);
 304 }
 305
 306 #define IP_RES 0x8000
 307
 308 static const struct tok ip_frag_values[] = {
 309         { IP_MF,        "+" },
 310         { IP_DF,        "DF" },
 311         { IP_RES,       "rsvd" }, /* The RFC3514 evil ;-) bit */
 312         { 0,            NULL }
 313 };
 314
 315 struct ip_print_demux_state {
 316         const struct ip *ip;
 317         const u_char *cp;
 318         u_int   len, off;
 319         u_char  nh;
 320         int     advance;
 321 };
 322
 323 static void
 324 ip_print_demux(netdissect_options *ndo,
 325                struct ip_print_demux_state *ipds)
 326 {
 327         struct protoent *proto;
 328         struct cksum_vec vec[1];
 329
 330 again:
 331         switch (ipds->nh) {
 332
 333         case IPPROTO_AH:
 334                 ipds->nh = *ipds->cp;
 335                 ipds->advance = ah_print(ipds->cp);
 336                 if (ipds->advance <= 0)
 337                         break;
 338                 ipds->cp += ipds->advance;
 339                 ipds->len -= ipds->advance;
 340                 goto again;
 341
 342         case IPPROTO_ESP:
 343         {
 344                 int enh, padlen;
 345                 ipds->advance = esp_print(ndo, ipds->cp, ipds->len,
 346                                     (const u_char *)ipds->ip,
 347                                     &enh, &padlen);
 348                 if (ipds->advance <= 0)
 349                         break;
 350                 ipds->cp += ipds->advance;
 351                 ipds->len -= ipds->advance + padlen;
 352                 ipds->nh = enh & 0xff;
 353                 goto again;
 354         }
 355
 356         case IPPROTO_IPCOMP:
 357         {
 358                 int enh;
 359                 ipds->advance = ipcomp_print(ipds->cp, &enh);
 360                 if (ipds->advance <= 0)
 361                         break;
 362                 ipds->cp += ipds->advance;
 363                 ipds->len -= ipds->advance;
 364                 ipds->nh = enh & 0xff;
 365                 goto again;
 366         }
 367
 368         case IPPROTO_SCTP:
 369                 sctp_print(ipds->cp, (const u_char *)ipds->ip, ipds->len);
 370                 break;
 371
 372         case IPPROTO_DCCP:
 373                 dccp_print(ipds->cp, (const u_char *)ipds->ip, ipds->len);
 374                 break;
 375
 376         case IPPROTO_TCP:
 377                 /* pass on the MF bit plus the offset to detect fragments */
 378                 tcp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip,
 379                           ipds->off & (IP_MF|IP_OFFMASK));
 380                 break;
 381
 382         case IPPROTO_UDP:
 383                 /* pass on the MF bit plus the offset to detect fragments */
 384                 udp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip,
 385                           ipds->off & (IP_MF|IP_OFFMASK));
 386                 break;
 387
 388         case IPPROTO_ICMP:
 389                 /* pass on the MF bit plus the offset to detect fragments */
 390                 icmp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip,
 391                            ipds->off & (IP_MF|IP_OFFMASK));
 392                 break;
 393
 394         case IPPROTO_PIGP:
 395                 /*
 396                  * XXX - the current IANA protocol number assignments
 397                  * page lists 9 as "any private interior gateway
 398                  * (used by Cisco for their IGRP)" and 88 as
 399                  * "EIGRP" from Cisco.
 400                  *
 401                  * Recent BSD <netinet/in.h> headers define
 402                  * IP_PROTO_PIGP as 9 and IP_PROTO_IGRP as 88.
 403                  * We define IP_PROTO_PIGP as 9 and
 404                  * IP_PROTO_EIGRP as 88; those names better
 405                  * match was the current protocol number
 406                  * assignments say.
 407                  */
 408                 igrp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip);
 409                 break;
 410
 411         case IPPROTO_EIGRP:
 412                 eigrp_print(ipds->cp, ipds->len);
 413                 break;
 414
 415         case IPPROTO_ND:
 416                 ND_PRINT((ndo, " nd %d", ipds->len));
 417                 break;
 418
 419         case IPPROTO_EGP:
 420                 egp_print(ipds->cp, ipds->len);
 421                 break;
 422
 423         case IPPROTO_OSPF:
 424                 ospf_print(ipds->cp, ipds->len, (const u_char *)ipds->ip);
 425                 break;
 426
 427         case IPPROTO_IGMP:
 428                 igmp_print(ipds->cp, ipds->len);
 429                 break;
 430
 431         case IPPROTO_IPV4:
 432                 /* DVMRP multicast tunnel (ip-in-ip encapsulation) */
 433                 ip_print(ndo, ipds->cp, ipds->len);
 434                 if (! vflag) {
 435                         ND_PRINT((ndo, " (ipip-proto-4)"));
 436                         return;
 437                 }
 438                 break;
 439
 440 #ifdef INET6
 441         case IPPROTO_IPV6:
 442                 /* ip6-in-ip encapsulation */
 443                 ip6_print(ndo, ipds->cp, ipds->len);
 444                 break;
 445 #endif /*INET6*/
 446
 447         case IPPROTO_RSVP:
 448                 rsvp_print(ipds->cp, ipds->len);
 449                 break;
 450
 451         case IPPROTO_GRE:
 452                 /* do it */
 453                 gre_print(ipds->cp, ipds->len);
 454                 break;
 455
 456         case IPPROTO_MOBILE:
 457                 mobile_print(ipds->cp, ipds->len);
 458                 break;
 459
 460         case IPPROTO_PIM:
 461                 vec[0].ptr = ipds->cp;
 462                 vec[0].len = ipds->len;
 463                 pim_print(ipds->cp, ipds->len, in_cksum(vec, 1));
 464                 break;
 465
 466         case IPPROTO_VRRP:
 467                 if (packettype == PT_CARP) {
 468                         if (vflag)
 469                                 (void)printf("carp %s > %s: ",
 470                                              ipaddr_string(&ipds->ip->ip_src),
 471                                              ipaddr_string(&ipds->ip->ip_dst));
 472                         carp_print(ipds->cp, ipds->len, ipds->ip->ip_ttl);
 473                 } else {
 474                         if (vflag)
 475                                 (void)printf("vrrp %s > %s: ",
 476                                              ipaddr_string(&ipds->ip->ip_src),
 477                                              ipaddr_string(&ipds->ip->ip_dst));
 478                         vrrp_print(ipds->cp, ipds->len, ipds->ip->ip_ttl);
 479                 }
 480                 break;
 481
 482         case IPPROTO_PGM:
 483                 pgm_print(ipds->cp, ipds->len, (const u_char *)ipds->ip);
 484                 break;
 485
 486         default:
 487                 if (ndo->ndo_nflag==0 && (proto = getprotobynumber(ipds->nh)) != NULL)
 488                         ND_PRINT((ndo, " %s", proto->p_name));
 489                 else
 490                         ND_PRINT((ndo, " ip-proto-%d", ipds->nh));
 491                 ND_PRINT((ndo, " %d", ipds->len));
 492                 break;
 493         }
 494 }
 495
 496 void
 497 ip_print_inner(netdissect_options *ndo,
 498                const u_char *bp,
 499                u_int length, u_int nh,
 500                const u_char *bp2)
 501 {
 502         struct ip_print_demux_state  ipd;
 503
 504         ipd.ip = (const struct ip *)bp2;
 505         ipd.cp = bp;
 506         ipd.len  = length;
 507         ipd.off  = 0;
 508         ipd.nh   = nh;
 509         ipd.advance = 0;
 510
 511         ip_print_demux(ndo, &ipd);
 512 }
 513
 514
 515 /*
 516  * print an IP datagram.
 517  */
 518 void
 519 ip_print(netdissect_options *ndo,
 520          const u_char *bp,
 521          u_int length)
 522 {
 523         struct ip_print_demux_state  ipd;
 524         struct ip_print_demux_state *ipds=&ipd;
 525         const u_char *ipend;
 526         u_int hlen;
 527         struct cksum_vec vec[1];
 528         u_int16_t sum, ip_sum;
 529         struct protoent *proto;
 530
 531         ipds->ip = (const struct ip *)bp;
 532         if (IP_V(ipds->ip) != 4) { /* print version if != 4 */
 533             printf("IP%u ", IP_V(ipds->ip));
 534             if (IP_V(ipds->ip) == 6)
 535                 printf(", wrong link-layer encapsulation");
 536         }
 537         else if (!eflag)
 538             printf("IP ");
 539
 540         if ((u_char *)(ipds->ip + 1) > ndo->ndo_snapend) {
 541                 printf("%s", tstr);
 542                 return;
 543         }
 544         if (length < sizeof (struct ip)) {
 545                 (void)printf("truncated-ip %u", length);
 546                 return;
 547         }
 548         hlen = IP_HL(ipds->ip) * 4;
 549         if (hlen < sizeof (struct ip)) {
 550                 (void)printf("bad-hlen %u", hlen);
 551                 return;
 552         }
 553
 554         ipds->len = EXTRACT_16BITS(&ipds->ip->ip_len);
 555         if (length < ipds->len)
 556                 (void)printf("truncated-ip - %u bytes missing! ",
 557                         ipds->len - length);
 558         if (ipds->len < hlen) {
 559 #ifdef GUESS_TSO
 560             if (ipds->len) {
 561                 (void)printf("bad-len %u", ipds->len);
 562                 return;
 563             }
 564             else {
 565                 /* we guess that it is a TSO send */
 566                 ipds->len = length;
 567             }
 568 #else
 569             (void)printf("bad-len %u", ipds->len);
 570             return;
 571 #endif /* GUESS_TSO */
 572         }
 573
 574         /*
 575          * Cut off the snapshot length to the end of the IP payload.
 576          */
 577         ipend = bp + ipds->len;
 578         if (ipend < ndo->ndo_snapend)
 579                 ndo->ndo_snapend = ipend;
 580
 581         ipds->len -= hlen;
 582
 583         ipds->off = EXTRACT_16BITS(&ipds->ip->ip_off);
 584
 585         if (vflag) {
 586             (void)printf("(tos 0x%x", (int)ipds->ip->ip_tos);
 587             /* ECN bits */
 588             if (ipds->ip->ip_tos & 0x03) {
 589                 switch (ipds->ip->ip_tos & 0x03) {
 590                 case 1:
 591                     (void)printf(",ECT(1)");
 592                     break;
 593                 case 2:
 594                     (void)printf(",ECT(0)");
 595                     break;
 596                 case 3:
 597                     (void)printf(",CE");
 598                 }
 599             }
 600
 601             if (ipds->ip->ip_ttl >= 1)
 602                 (void)printf(", ttl %u", ipds->ip->ip_ttl);
 603
 604             /*
 605              * for the firewall guys, print id, offset.
 606              * On all but the last stick a "+" in the flags portion.
 607              * For unfragmented datagrams, note the don't fragment flag.
 608              */
 609
 610             (void)printf(", id %u, offset %u, flags [%s], proto %s (%u)",
 611                          EXTRACT_16BITS(&ipds->ip->ip_id),
 612                          (ipds->off & 0x1fff) * 8,
 613                          bittok2str(ip_frag_values, "none", ipds->off&0xe000),
 614                          tok2str(ipproto_values,"unknown",ipds->ip->ip_p),
 615                          ipds->ip->ip_p);
 616
 617             (void)printf(", length %u", EXTRACT_16BITS(&ipds->ip->ip_len));
 618
 619             if ((hlen - sizeof(struct ip)) > 0) {
 620                 printf(", options (");
 621                 ip_optprint((u_char *)(ipds->ip + 1), hlen - sizeof(struct ip));
 622                 printf(")");
 623             }
 624
 625             if (!Kflag && (u_char *)ipds->ip + hlen <= ndo->ndo_snapend) {
 626                 vec[0].ptr = (const u_int8_t *)(void *)ipds->ip;
 627                 vec[0].len = hlen;
 628                 sum = in_cksum(vec, 1);
 629                 if (sum != 0) {
 630                     ip_sum = EXTRACT_16BITS(&ipds->ip->ip_sum);
 631                     (void)printf(", bad cksum %x (->%x)!", ip_sum,
 632                              in_cksum_shouldbe(ip_sum, sum));
 633                 }
 634             }
 635
 636             printf(")\n    ");
 637         }
 638
 639         /*
 640          * If this is fragment zero, hand it to the next higher
 641          * level protocol.
 642          */
 643         if ((ipds->off & 0x1fff) == 0) {
 644                 ipds->cp = (const u_char *)ipds->ip + hlen;
 645                 ipds->nh = ipds->ip->ip_p;
 646
 647                 if (ipds->nh != IPPROTO_TCP && ipds->nh != IPPROTO_UDP &&
 648                     ipds->nh != IPPROTO_SCTP && ipds->nh != IPPROTO_DCCP) {
 649                         (void)printf("%s > %s: ",
 650                                      ipaddr_string(&ipds->ip->ip_src),
 651                                      ipaddr_string(&ipds->ip->ip_dst));
 652                 }
 653                 ip_print_demux(ndo, ipds);
 654         } else {
 655             /* Ultra quiet now means that all this stuff should be suppressed */
 656             if (qflag > 1) return;
 657
 658             /*
 659              * if this isn't the first frag, we're missing the
 660              * next level protocol header.  print the ip addr
 661              * and the protocol.
 662              */
 663             if (ipds->off & 0x1fff) {
 664                 (void)printf("%s > %s:", ipaddr_string(&ipds->ip->ip_src),
 665                              ipaddr_string(&ipds->ip->ip_dst));
 666                 if (!ndo->ndo_nflag && (proto = getprotobynumber(ipds->ip->ip_p)) != NULL)
 667                     (void)printf(" %s", proto->p_name);
 668                 else
 669                     (void)printf(" ip-proto-%d", ipds->ip->ip_p);
 670             }
 671         }
 672 }
 673
 674 void
 675 ipN_print(register const u_char *bp, register u_int length)
 676 {
 677         struct ip *ip, hdr;
 678
 679         ip = (struct ip *)bp;
 680         if (length < 4) {
 681                 (void)printf("truncated-ip %d", length);
 682                 return;
 683         }
 684         memcpy (&hdr, (char *)ip, 4);
 685         switch (IP_V(&hdr)) {
 686         case 4:
 687                 ip_print (gndo, bp, length);
 688                 return;
 689 #ifdef INET6
 690         case 6:
 691                 ip6_print (gndo, bp, length);
 692                 return;
 693 #endif
 694         default:
 695                 (void)printf("unknown ip %d", IP_V(&hdr));
 696                 return;
 697         }
 698 }
 699
 700 /*
 701  * Local Variables:
 702  * c-style: whitesmith
 703  * c-basic-offset: 8
 704  * End:
 705  */
 706
 707