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 <netdissect-stdinc.h>
  27
  28 #include <string.h>
  29
  30 #include "netdissect.h"
  31 #include "addrtoname.h"
  32 #include "extract.h"
  33
  34 #include "ip.h"
  35 #include "ipproto.h"
  36
  37 static const char tstr[] = "[|ip]";
  38
  39 static const struct tok ip_option_values[] = {
  40     { IPOPT_EOL, "EOL" },
  41     { IPOPT_NOP, "NOP" },
  42     { IPOPT_TS, "timestamp" },
  43     { IPOPT_SECURITY, "security" },
  44     { IPOPT_RR, "RR" },
  45     { IPOPT_SSRR, "SSRR" },
  46     { IPOPT_LSRR, "LSRR" },
  47     { IPOPT_RA, "RA" },
  48     { IPOPT_RFC1393, "traceroute" },
  49     { 0, NULL }
  50 };
  51
  52 /*
  53  * print the recorded route in an IP RR, LSRR or SSRR option.
  54  */
  55 static void
  56 ip_printroute(netdissect_options *ndo,
  57               register const u_char *cp, u_int length)
  58 {
  59         register u_int ptr;
  60         register u_int len;
  61
  62         if (length < 3) {
  63                 ND_PRINT((ndo, " [bad length %u]", length));
  64                 return;
  65         }
  66         if ((length + 1) & 3)
  67                 ND_PRINT((ndo, " [bad length %u]", length));
  68         ptr = cp[2] - 1;
  69         if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
  70                 ND_PRINT((ndo, " [bad ptr %u]", cp[2]));
  71
  72         for (len = 3; len < length; len += 4) {
  73                 ND_PRINT((ndo, " %s", ipaddr_string(ndo, &cp[len])));
  74                 if (ptr > len)
  75                         ND_PRINT((ndo, ","));
  76         }
  77 }
  78
  79 /*
  80  * If source-routing is present and valid, return the final destination.
  81  * Otherwise, return IP destination.
  82  *
  83  * This is used for UDP and TCP pseudo-header in the checksum
  84  * calculation.
  85  */
  86 static uint32_t
  87 ip_finddst(netdissect_options *ndo,
  88            const struct ip *ip)
  89 {
  90         int length;
  91         int len;
  92         const u_char *cp;
  93         uint32_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                 ND_TCHECK(*cp);
 102                 tt = *cp;
 103                 if (tt == IPOPT_EOL)
 104                         break;
 105                 else if (tt == IPOPT_NOP)
 106                         len = 1;
 107                 else {
 108                         ND_TCHECK(cp[1]);
 109                         len = cp[1];
 110                         if (len < 2)
 111                                 break;
 112                 }
 113                 ND_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, sizeof(uint32_t));
 126         return retval;
 127 }
 128
 129 /*
 130  * Compute a V4-style checksum by building a pseudoheader.
 131  */
 132 int
 133 nextproto4_cksum(netdissect_options *ndo,
 134                  const struct ip *ip, const uint8_t *data,
 135                  u_int len, u_int covlen, u_int next_proto)
 136 {
 137         struct phdr {
 138                 uint32_t src;
 139                 uint32_t dst;
 140                 u_char mbz;
 141                 u_char proto;
 142                 uint16_t len;
 143         } ph;
 144         struct cksum_vec vec[2];
 145
 146         /* pseudo-header.. */
 147         ph.len = htons((uint16_t)len);
 148         ph.mbz = 0;
 149         ph.proto = next_proto;
 150         UNALIGNED_MEMCPY(&ph.src, &ip->ip_src, sizeof(uint32_t));
 151         if (IP_HL(ip) == 5)
 152                 UNALIGNED_MEMCPY(&ph.dst, &ip->ip_dst, sizeof(uint32_t));
 153         else
 154                 ph.dst = ip_finddst(ndo, ip);
 155
 156         vec[0].ptr = (const uint8_t *)(void *)&ph;
 157         vec[0].len = sizeof(ph);
 158         vec[1].ptr = data;
 159         vec[1].len = covlen;
 160         return (in_cksum(vec, 2));
 161 }
 162
 163 static void
 164 ip_printts(netdissect_options *ndo,
 165            register const u_char *cp, u_int length)
 166 {
 167         register u_int ptr;
 168         register u_int len;
 169         int hoplen;
 170         const char *type;
 171
 172         if (length < 4) {
 173                 ND_PRINT((ndo, "[bad length %u]", length));
 174                 return;
 175         }
 176         ND_PRINT((ndo, " TS{"));
 177         hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
 178         if ((length - 4) & (hoplen-1))
 179                 ND_PRINT((ndo, "[bad length %u]", length));
 180         ptr = cp[2] - 1;
 181         len = 0;
 182         if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
 183                 ND_PRINT((ndo, "[bad ptr %u]", cp[2]));
 184         switch (cp[3]&0xF) {
 185         case IPOPT_TS_TSONLY:
 186                 ND_PRINT((ndo, "TSONLY"));
 187                 break;
 188         case IPOPT_TS_TSANDADDR:
 189                 ND_PRINT((ndo, "TS+ADDR"));
 190                 break;
 191         /*
 192          * prespecified should really be 3, but some ones might send 2
 193          * instead, and the IPOPT_TS_PRESPEC constant can apparently
 194          * have both values, so we have to hard-code it here.
 195          */
 196
 197         case 2:
 198                 ND_PRINT((ndo, "PRESPEC2.0"));
 199                 break;
 200         case 3:                 /* IPOPT_TS_PRESPEC */
 201                 ND_PRINT((ndo, "PRESPEC"));
 202                 break;
 203         default:
 204                 ND_PRINT((ndo, "[bad ts type %d]", cp[3]&0xF));
 205                 goto done;
 206         }
 207
 208         type = " ";
 209         for (len = 4; len < length; len += hoplen) {
 210                 if (ptr == len)
 211                         type = " ^ ";
 212                 ND_PRINT((ndo, "%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
 213                        hoplen!=8 ? "" : ipaddr_string(ndo, &cp[len])));
 214                 type = " ";
 215         }
 216
 217 done:
 218         ND_PRINT((ndo, "%s", ptr == len ? " ^ " : ""));
 219
 220         if (cp[3]>>4)
 221                 ND_PRINT((ndo, " [%d hops not recorded]} ", cp[3]>>4));
 222         else
 223                 ND_PRINT((ndo, "}"));
 224 }
 225
 226 /*
 227  * print IP options.
 228  */
 229 static void
 230 ip_optprint(netdissect_options *ndo,
 231             register const u_char *cp, u_int length)
 232 {
 233         register u_int option_len;
 234         const char *sep = "";
 235
 236         for (; length > 0; cp += option_len, length -= option_len) {
 237                 u_int option_code;
 238
 239                 ND_PRINT((ndo, "%s", sep));
 240                 sep = ",";
 241
 242                 ND_TCHECK(*cp);
 243                 option_code = *cp;
 244
 245                 ND_PRINT((ndo, "%s",
 246                           tok2str(ip_option_values,"unknown %u",option_code)));
 247
 248                 if (option_code == IPOPT_NOP ||
 249                     option_code == IPOPT_EOL)
 250                         option_len = 1;
 251
 252                 else {
 253                         ND_TCHECK(cp[1]);
 254                         option_len = cp[1];
 255                         if (option_len < 2) {
 256                                 ND_PRINT((ndo, " [bad length %u]", option_len));
 257                                 return;
 258                         }
 259                 }
 260
 261                 if (option_len > length) {
 262                         ND_PRINT((ndo, " [bad length %u]", option_len));
 263                         return;
 264                 }
 265
 266                 ND_TCHECK2(*cp, option_len);
 267
 268                 switch (option_code) {
 269                 case IPOPT_EOL:
 270                         return;
 271
 272                 case IPOPT_TS:
 273                         ip_printts(ndo, cp, option_len);
 274                         break;
 275
 276                 case IPOPT_RR:       /* fall through */
 277                 case IPOPT_SSRR:
 278                 case IPOPT_LSRR:
 279                         ip_printroute(ndo, cp, option_len);
 280                         break;
 281
 282                 case IPOPT_RA:
 283                         if (option_len < 4) {
 284                                 ND_PRINT((ndo, " [bad length %u]", option_len));
 285                                 break;
 286                         }
 287                         ND_TCHECK(cp[3]);
 288                         if (EXTRACT_16BITS(&cp[2]) != 0)
 289                                 ND_PRINT((ndo, " value %u", EXTRACT_16BITS(&cp[2])));
 290                         break;
 291
 292                 case IPOPT_NOP:       /* nothing to print - fall through */
 293                 case IPOPT_SECURITY:
 294                 default:
 295                         break;
 296                 }
 297         }
 298         return;
 299
 300 trunc:
 301         ND_PRINT((ndo, "%s", tstr));
 302 }
 303
 304 #define IP_RES 0x8000
 305
 306 static const struct tok ip_frag_values[] = {
 307         { IP_MF,        "+" },
 308         { IP_DF,        "DF" },
 309         { IP_RES,       "rsvd" }, /* The RFC3514 evil ;-) bit */
 310         { 0,            NULL }
 311 };
 312
 313 struct ip_print_demux_state {
 314         const struct ip *ip;
 315         const u_char *cp;
 316         u_int   len, off;
 317         u_char  nh;
 318         int     advance;
 319 };
 320
 321 static void
 322 ip_print_demux(netdissect_options *ndo,
 323                struct ip_print_demux_state *ipds)
 324 {
 325         struct protoent *proto;
 326
 327 again:
 328         switch (ipds->nh) {
 329
 330         case IPPROTO_AH:
 331                 ipds->nh = *ipds->cp;
 332                 ipds->advance = ah_print(ndo, ipds->cp);
 333                 if (ipds->advance <= 0)
 334                         break;
 335                 ipds->cp += ipds->advance;
 336                 ipds->len -= ipds->advance;
 337                 goto again;
 338
 339         case IPPROTO_ESP:
 340         {
 341                 int enh, padlen;
 342                 ipds->advance = esp_print(ndo, ipds->cp, ipds->len,
 343                                     (const u_char *)ipds->ip,
 344                                     &enh, &padlen);
 345                 if (ipds->advance <= 0)
 346                         break;
 347                 ipds->cp += ipds->advance;
 348                 ipds->len -= ipds->advance + padlen;
 349                 ipds->nh = enh & 0xff;
 350                 goto again;
 351         }
 352
 353         case IPPROTO_IPCOMP:
 354         {
 355                 int enh;
 356                 ipds->advance = ipcomp_print(ndo, ipds->cp, &enh);
 357                 if (ipds->advance <= 0)
 358                         break;
 359                 ipds->cp += ipds->advance;
 360                 ipds->len -= ipds->advance;
 361                 ipds->nh = enh & 0xff;
 362                 goto again;
 363         }
 364
 365         case IPPROTO_SCTP:
 366                 sctp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len);
 367                 break;
 368
 369         case IPPROTO_DCCP:
 370                 dccp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len);
 371                 break;
 372
 373         case IPPROTO_TCP:
 374                 /* pass on the MF bit plus the offset to detect fragments */
 375                 tcp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
 376                           ipds->off & (IP_MF|IP_OFFMASK));
 377                 break;
 378
 379         case IPPROTO_UDP:
 380                 /* pass on the MF bit plus the offset to detect fragments */
 381                 udp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
 382                           ipds->off & (IP_MF|IP_OFFMASK));
 383                 break;
 384
 385         case IPPROTO_ICMP:
 386                 /* pass on the MF bit plus the offset to detect fragments */
 387                 icmp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
 388                            ipds->off & (IP_MF|IP_OFFMASK));
 389                 break;
 390
 391         case IPPROTO_PIGP:
 392                 /*
 393                  * XXX - the current IANA protocol number assignments
 394                  * page lists 9 as "any private interior gateway
 395                  * (used by Cisco for their IGRP)" and 88 as
 396                  * "EIGRP" from Cisco.
 397                  *
 398                  * Recent BSD <netinet/in.h> headers define
 399                  * IP_PROTO_PIGP as 9 and IP_PROTO_IGRP as 88.
 400                  * We define IP_PROTO_PIGP as 9 and
 401                  * IP_PROTO_EIGRP as 88; those names better
 402                  * match was the current protocol number
 403                  * assignments say.
 404                  */
 405                 igrp_print(ndo, ipds->cp, ipds->len);
 406                 break;
 407
 408         case IPPROTO_EIGRP:
 409                 eigrp_print(ndo, ipds->cp, ipds->len);
 410                 break;
 411
 412         case IPPROTO_ND:
 413                 ND_PRINT((ndo, " nd %d", ipds->len));
 414                 break;
 415
 416         case IPPROTO_EGP:
 417                 egp_print(ndo, ipds->cp, ipds->len);
 418                 break;
 419
 420         case IPPROTO_OSPF:
 421                 ospf_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
 422                 break;
 423
 424         case IPPROTO_IGMP:
 425                 igmp_print(ndo, ipds->cp, ipds->len);
 426                 break;
 427
 428         case IPPROTO_IPV4:
 429                 /* DVMRP multicast tunnel (ip-in-ip encapsulation) */
 430                 ip_print(ndo, ipds->cp, ipds->len);
 431                 if (! ndo->ndo_vflag) {
 432                         ND_PRINT((ndo, " (ipip-proto-4)"));
 433                         return;
 434                 }
 435                 break;
 436
 437         case IPPROTO_IPV6:
 438                 /* ip6-in-ip encapsulation */
 439                 ip6_print(ndo, ipds->cp, ipds->len);
 440                 break;
 441
 442         case IPPROTO_RSVP:
 443                 rsvp_print(ndo, 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                 pim_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
 457                 break;
 458
 459         case IPPROTO_VRRP:
 460                 if (ndo->ndo_packettype == PT_CARP) {
 461                         if (ndo->ndo_vflag)
 462                                 ND_PRINT((ndo, "carp %s > %s: ",
 463                                              ipaddr_string(ndo, &ipds->ip->ip_src),
 464                                              ipaddr_string(ndo, &ipds->ip->ip_dst)));
 465                         carp_print(ndo, ipds->cp, ipds->len, ipds->ip->ip_ttl);
 466                 } else {
 467                         if (ndo->ndo_vflag)
 468                                 ND_PRINT((ndo, "vrrp %s > %s: ",
 469                                              ipaddr_string(ndo, &ipds->ip->ip_src),
 470                                              ipaddr_string(ndo, &ipds->ip->ip_dst)));
 471                         vrrp_print(ndo, ipds->cp, ipds->len,
 472                                 (const u_char *)ipds->ip, ipds->ip->ip_ttl);
 473                 }
 474                 break;
 475
 476         case IPPROTO_PGM:
 477                 pgm_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
 478                 break;
 479
 480         default:
 481                 if (ndo->ndo_nflag==0 && (proto = getprotobynumber(ipds->nh)) != NULL)
 482                         ND_PRINT((ndo, " %s", proto->p_name));
 483                 else
 484                         ND_PRINT((ndo, " ip-proto-%d", ipds->nh));
 485                 ND_PRINT((ndo, " %d", ipds->len));
 486                 break;
 487         }
 488 }
 489
 490 void
 491 ip_print_inner(netdissect_options *ndo,
 492                const u_char *bp,
 493                u_int length, u_int nh,
 494                const u_char *bp2)
 495 {
 496         struct ip_print_demux_state  ipd;
 497
 498         ipd.ip = (const struct ip *)bp2;
 499         ipd.cp = bp;
 500         ipd.len  = length;
 501         ipd.off  = 0;
 502         ipd.nh   = nh;
 503         ipd.advance = 0;
 504
 505         ip_print_demux(ndo, &ipd);
 506 }
 507
 508
 509 /*
 510  * print an IP datagram.
 511  */
 512 void
 513 ip_print(netdissect_options *ndo,
 514          const u_char *bp,
 515          u_int length)
 516 {
 517         struct ip_print_demux_state  ipd;
 518         struct ip_print_demux_state *ipds=&ipd;
 519         const u_char *ipend;
 520         u_int hlen;
 521         struct cksum_vec vec[1];
 522         uint16_t sum, ip_sum;
 523         struct protoent *proto;
 524
 525         ipds->ip = (const struct ip *)bp;
 526         ND_TCHECK(ipds->ip->ip_vhl);
 527         if (IP_V(ipds->ip) != 4) { /* print version if != 4 */
 528             if (IP_V(ipds->ip) == 6)
 529               ND_PRINT((ndo, "IP6, wrong link-layer encapsulation "));
 530             else
 531               ND_PRINT((ndo, "IP%u ", IP_V(ipds->ip)));
 532         }
 533         else if (!ndo->ndo_eflag)
 534                 ND_PRINT((ndo, "IP "));
 535
 536         ND_TCHECK(*ipds->ip);
 537         if (length < sizeof (struct ip)) {
 538                 ND_PRINT((ndo, "truncated-ip %u", length));
 539                 return;
 540         }
 541         hlen = IP_HL(ipds->ip) * 4;
 542         if (hlen < sizeof (struct ip)) {
 543                 ND_PRINT((ndo, "bad-hlen %u", hlen));
 544                 return;
 545         }
 546
 547         ipds->len = EXTRACT_16BITS(&ipds->ip->ip_len);
 548         if (length < ipds->len)
 549                 ND_PRINT((ndo, "truncated-ip - %u bytes missing! ",
 550                         ipds->len - length));
 551         if (ipds->len < hlen) {
 552 #ifdef GUESS_TSO
 553             if (ipds->len) {
 554                 ND_PRINT((ndo, "bad-len %u", ipds->len));
 555                 return;
 556             }
 557             else {
 558                 /* we guess that it is a TSO send */
 559                 ipds->len = length;
 560             }
 561 #else
 562             ND_PRINT((ndo, "bad-len %u", ipds->len));
 563             return;
 564 #endif /* GUESS_TSO */
 565         }
 566
 567         /*
 568          * Cut off the snapshot length to the end of the IP payload.
 569          */
 570         ipend = bp + ipds->len;
 571         if (ipend < ndo->ndo_snapend)
 572                 ndo->ndo_snapend = ipend;
 573
 574         ipds->len -= hlen;
 575
 576         ipds->off = EXTRACT_16BITS(&ipds->ip->ip_off);
 577
 578         if (ndo->ndo_vflag) {
 579             ND_PRINT((ndo, "(tos 0x%x", (int)ipds->ip->ip_tos));
 580             /* ECN bits */
 581             if (ipds->ip->ip_tos & 0x03) {
 582                 switch (ipds->ip->ip_tos & 0x03) {
 583                 case 1:
 584                     ND_PRINT((ndo, ",ECT(1)"));
 585                     break;
 586                 case 2:
 587                     ND_PRINT((ndo, ",ECT(0)"));
 588                     break;
 589                 case 3:
 590                     ND_PRINT((ndo, ",CE"));
 591                 }
 592             }
 593
 594             if (ipds->ip->ip_ttl >= 1)
 595                 ND_PRINT((ndo, ", ttl %u", ipds->ip->ip_ttl));
 596
 597             /*
 598              * for the firewall guys, print id, offset.
 599              * On all but the last stick a "+" in the flags portion.
 600              * For unfragmented datagrams, note the don't fragment flag.
 601              */
 602
 603             ND_PRINT((ndo, ", id %u, offset %u, flags [%s], proto %s (%u)",
 604                          EXTRACT_16BITS(&ipds->ip->ip_id),
 605                          (ipds->off & 0x1fff) * 8,
 606                          bittok2str(ip_frag_values, "none", ipds->off&0xe000),
 607                          tok2str(ipproto_values,"unknown",ipds->ip->ip_p),
 608                          ipds->ip->ip_p));
 609
 610             ND_PRINT((ndo, ", length %u", EXTRACT_16BITS(&ipds->ip->ip_len)));
 611
 612             if ((hlen - sizeof(struct ip)) > 0) {
 613                 ND_PRINT((ndo, ", options ("));
 614                 ip_optprint(ndo, (const u_char *)(ipds->ip + 1), hlen - sizeof(struct ip));
 615                 ND_PRINT((ndo, ")"));
 616             }
 617
 618             if (!ndo->ndo_Kflag && (const u_char *)ipds->ip + hlen <= ndo->ndo_snapend) {
 619                 vec[0].ptr = (const uint8_t *)(const void *)ipds->ip;
 620                 vec[0].len = hlen;
 621                 sum = in_cksum(vec, 1);
 622                 if (sum != 0) {
 623                     ip_sum = EXTRACT_16BITS(&ipds->ip->ip_sum);
 624                     ND_PRINT((ndo, ", bad cksum %x (->%x)!", ip_sum,
 625                              in_cksum_shouldbe(ip_sum, sum)));
 626                 }
 627             }
 628
 629                 ND_PRINT((ndo, ")\n    "));
 630         }
 631
 632         /*
 633          * If this is fragment zero, hand it to the next higher
 634          * level protocol.
 635          */
 636         if ((ipds->off & 0x1fff) == 0) {
 637                 ipds->cp = (const u_char *)ipds->ip + hlen;
 638                 ipds->nh = ipds->ip->ip_p;
 639
 640                 if (ipds->nh != IPPROTO_TCP && ipds->nh != IPPROTO_UDP &&
 641                     ipds->nh != IPPROTO_SCTP && ipds->nh != IPPROTO_DCCP) {
 642                         ND_PRINT((ndo, "%s > %s: ",
 643                                      ipaddr_string(ndo, &ipds->ip->ip_src),
 644                                      ipaddr_string(ndo, &ipds->ip->ip_dst)));
 645                 }
 646                 ip_print_demux(ndo, ipds);
 647         } else {
 648             /* Ultra quiet now means that all this stuff should be suppressed */
 649             if (ndo->ndo_qflag > 1) return;
 650
 651             /*
 652              * if this isn't the first frag, we're missing the
 653              * next level protocol header.  print the ip addr
 654              * and the protocol.
 655              */
 656                 if (ipds->off & 0x1fff) {
 657                         ND_PRINT((ndo, "%s > %s:", ipaddr_string(ndo, &ipds->ip->ip_src),
 658                                   ipaddr_string(ndo, &ipds->ip->ip_dst)));
 659                         if (!ndo->ndo_nflag && (proto = getprotobynumber(ipds->ip->ip_p)) != NULL)
 660                                 ND_PRINT((ndo, " %s", proto->p_name));
 661                         else
 662                                 ND_PRINT((ndo, " ip-proto-%d", ipds->ip->ip_p));
 663                 }
 664         }
 665         return;
 666
 667 trunc:
 668         ND_PRINT((ndo, "%s", tstr));
 669         return;
 670 }
 671
 672 void
 673 ipN_print(netdissect_options *ndo, register const u_char *bp, register u_int length)
 674 {
 675         struct ip hdr;
 676
 677         if (length < 4) {
 678                 ND_PRINT((ndo, "truncated-ip %d", length));
 679                 return;
 680         }
 681         memcpy (&hdr, bp, 4);
 682         switch (IP_V(&hdr)) {
 683         case 4:
 684                 ip_print (ndo, bp, length);
 685                 return;
 686         case 6:
 687                 ip6_print (ndo, bp, length);
 688                 return;
 689         default:
 690                 ND_PRINT((ndo, "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