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