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 #define NETDISSECT_REWORKED
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include <tcpdump-stdinc.h>
  28
  29 #include <string.h>
  30
  31 #include "interface.h"
  32 #include "addrtoname.h"
  33 #include "extract.h"                    /* must come after interface.h */
  34
  35 #include "ip.h"
  36 #include "ipproto.h"
  37
  38 static const char tstr[] = "[|ip]";
  39
  40 static const struct tok ip_option_values[] = {
  41     { IPOPT_EOL, "EOL" },
  42     { IPOPT_NOP, "NOP" },
  43     { IPOPT_TS, "timestamp" },
  44     { IPOPT_SECURITY, "security" },
  45     { IPOPT_RR, "RR" },
  46     { IPOPT_SSRR, "SSRR" },
  47     { IPOPT_LSRR, "LSRR" },
  48     { IPOPT_RA, "RA" },
  49     { IPOPT_RFC1393, "traceroute" },
  50     { 0, NULL }
  51 };
  52
  53 /*
  54  * print the recorded route in an IP RR, LSRR or SSRR option.
  55  */
  56 static void
  57 ip_printroute(netdissect_options *ndo,
  58               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                 ND_PRINT((ndo, " [bad length %u]", length));
  65                 return;
  66         }
  67         if ((length + 1) & 3)
  68                 ND_PRINT((ndo, " [bad length %u]", length));
  69         ptr = cp[2] - 1;
  70         if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
  71                 ND_PRINT((ndo, " [bad ptr %u]", cp[2]));
  72
  73         for (len = 3; len < length; len += 4) {
  74                 ND_PRINT((ndo, " %s", ipaddr_string(ndo, &cp[len])));
  75                 if (ptr > len)
  76                         ND_PRINT((ndo, ","));
  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 uint32_t
  88 ip_finddst(netdissect_options *ndo,
  89            const struct ip *ip)
  90 {
  91         int length;
  92         int len;
  93         const u_char *cp;
  94         uint32_t retval;
  95
  96         cp = (const u_char *)(ip + 1);
  97         length = (IP_HL(ip) << 2) - sizeof(struct ip);
  98
  99         for (; length > 0; cp += len, length -= len) {
 100                 int tt;
 101
 102                 ND_TCHECK(*cp);
 103                 tt = *cp;
 104                 if (tt == IPOPT_EOL)
 105                         break;
 106                 else if (tt == IPOPT_NOP)
 107                         len = 1;
 108                 else {
 109                         ND_TCHECK(cp[1]);
 110                         len = cp[1];
 111                         if (len < 2)
 112                                 break;
 113                 }
 114                 ND_TCHECK2(*cp, len);
 115                 switch (tt) {
 116
 117                 case IPOPT_SSRR:
 118                 case IPOPT_LSRR:
 119                         if (len < 7)
 120                                 break;
 121                         UNALIGNED_MEMCPY(&retval, cp + len - 4, 4);
 122                         return retval;
 123                 }
 124         }
 125 trunc:
 126         UNALIGNED_MEMCPY(&retval, &ip->ip_dst.s_addr, sizeof(uint32_t));
 127         return retval;
 128 }
 129
 130 /*
 131  * Compute a V4-style checksum by building a pseudoheader.
 132  */
 133 int
 134 nextproto4_cksum(netdissect_options *ndo,
 135                  const struct ip *ip, const uint8_t *data,
 136                  u_int len, u_int covlen, u_int next_proto)
 137 {
 138         struct phdr {
 139                 uint32_t src;
 140                 uint32_t dst;
 141                 u_char mbz;
 142                 u_char proto;
 143                 uint16_t len;
 144         } ph;
 145         struct cksum_vec vec[2];
 146
 147         /* pseudo-header.. */
 148         ph.len = htons((uint16_t)len);
 149         ph.mbz = 0;
 150         ph.proto = next_proto;
 151         UNALIGNED_MEMCPY(&ph.src, &ip->ip_src.s_addr, sizeof(uint32_t));
 152         if (IP_HL(ip) == 5)
 153                 UNALIGNED_MEMCPY(&ph.dst, &ip->ip_dst.s_addr, sizeof(uint32_t));
 154         else
 155                 ph.dst = ip_finddst(ndo, ip);
 156
 157         vec[0].ptr = (const uint8_t *)(void *)&ph;
 158         vec[0].len = sizeof(ph);
 159         vec[1].ptr = data;
 160         vec[1].len = covlen;
 161         return (in_cksum(vec, 2));
 162 }
 163
 164 static void
 165 ip_printts(netdissect_options *ndo,
 166            register const u_char *cp, u_int length)
 167 {
 168         register u_int ptr;
 169         register u_int len;
 170         int hoplen;
 171         const char *type;
 172
 173         if (length < 4) {
 174                 ND_PRINT((ndo, "[bad length %u]", length));
 175                 return;
 176         }
 177         ND_PRINT((ndo, " TS{"));
 178         hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
 179         if ((length - 4) & (hoplen-1))
 180                 ND_PRINT((ndo, "[bad length %u]", length));
 181         ptr = cp[2] - 1;
 182         len = 0;
 183         if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
 184                 ND_PRINT((ndo, "[bad ptr %u]", cp[2]));
 185         switch (cp[3]&0xF) {
 186         case IPOPT_TS_TSONLY:
 187                 ND_PRINT((ndo, "TSONLY"));
 188                 break;
 189         case IPOPT_TS_TSANDADDR:
 190                 ND_PRINT((ndo, "TS+ADDR"));
 191                 break;
 192         /*
 193          * prespecified should really be 3, but some ones might send 2
 194          * instead, and the IPOPT_TS_PRESPEC constant can apparently
 195          * have both values, so we have to hard-code it here.
 196          */
 197
 198         case 2:
 199                 ND_PRINT((ndo, "PRESPEC2.0"));
 200                 break;
 201         case 3:                 /* IPOPT_TS_PRESPEC */
 202                 ND_PRINT((ndo, "PRESPEC"));
 203                 break;
 204         default:
 205                 ND_PRINT((ndo, "[bad ts type %d]", cp[3]&0xF));
 206                 goto done;
 207         }
 208
 209         type = " ";
 210         for (len = 4; len < length; len += hoplen) {
 211                 if (ptr == len)
 212                         type = " ^ ";
 213                 ND_PRINT((ndo, "%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
 214                        hoplen!=8 ? "" : ipaddr_string(ndo, &cp[len])));
 215                 type = " ";
 216         }
 217
 218 done:
 219         ND_PRINT((ndo, "%s", ptr == len ? " ^ " : ""));
 220
 221         if (cp[3]>>4)
 222                 ND_PRINT((ndo, " [%d hops not recorded]} ", cp[3]>>4));
 223         else
 224                 ND_PRINT((ndo, "}"));
 225 }
 226
 227 /*
 228  * print IP options.
 229  */
 230 static void
 231 ip_optprint(netdissect_options *ndo,
 232             register const u_char *cp, u_int length)
 233 {
 234         register u_int option_len;
 235         const char *sep = "";
 236
 237         for (; length > 0; cp += option_len, length -= option_len) {
 238                 u_int option_code;
 239
 240                 ND_PRINT((ndo, "%s", sep));
 241                 sep = ",";
 242
 243                 ND_TCHECK(*cp);
 244                 option_code = *cp;
 245
 246                 ND_PRINT((ndo, "%s",
 247                           tok2str(ip_option_values,"unknown %u",option_code)));
 248
 249                 if (option_code == IPOPT_NOP ||
 250                     option_code == IPOPT_EOL)
 251                         option_len = 1;
 252
 253                 else {
 254                         ND_TCHECK(cp[1]);
 255                         option_len = cp[1];
 256                         if (option_len < 2) {
 257                                 ND_PRINT((ndo, " [bad length %u]", option_len));
 258                                 return;
 259                         }
 260                 }
 261
 262                 if (option_len > length) {
 263                         ND_PRINT((ndo, " [bad length %u]", option_len));
 264                         return;
 265                 }
 266
 267                 ND_TCHECK2(*cp, option_len);
 268
 269                 switch (option_code) {
 270                 case IPOPT_EOL:
 271                         return;
 272
 273                 case IPOPT_TS:
 274                         ip_printts(ndo, cp, option_len);
 275                         break;
 276
 277                 case IPOPT_RR:       /* fall through */
 278                 case IPOPT_SSRR:
 279                 case IPOPT_LSRR:
 280                         ip_printroute(ndo, cp, option_len);
 281                         break;
 282
 283                 case IPOPT_RA:
 284                         if (option_len < 4) {
 285                                 ND_PRINT((ndo, " [bad length %u]", option_len));
 286                                 break;
 287                         }
 288                         ND_TCHECK(cp[3]);
 289                         if (EXTRACT_16BITS(&cp[2]) != 0)
 290                                 ND_PRINT((ndo, " value %u", EXTRACT_16BITS(&cp[2])));
 291                         break;
 292
 293                 case IPOPT_NOP:       /* nothing to print - fall through */
 294                 case IPOPT_SECURITY:
 295                 default:
 296                         break;
 297                 }
 298         }
 299         return;
 300
 301 trunc:
 302         ND_PRINT((ndo, "%s", tstr));
 303 }
 304
 305 #define IP_RES 0x8000
 306
 307 static const struct tok ip_frag_values[] = {
 308         { IP_MF,        "+" },
 309         { IP_DF,        "DF" },
 310         { IP_RES,       "rsvd" }, /* The RFC3514 evil ;-) bit */
 311         { 0,            NULL }
 312 };
 313
 314 struct ip_print_demux_state {
 315         const struct ip *ip;
 316         const u_char *cp;
 317         u_int   len, off;
 318         u_char  nh;
 319         int     advance;
 320 };
 321
 322 static void
 323 ip_print_demux(netdissect_options *ndo,
 324                struct ip_print_demux_state *ipds)
 325 {
 326         struct protoent *proto;
 327
 328 again:
 329         switch (ipds->nh) {
 330
 331         case IPPROTO_AH:
 332                 ipds->nh = *ipds->cp;
 333                 ipds->advance = ah_print(ndo, ipds->cp);
 334                 if (ipds->advance <= 0)
 335                         break;
 336                 ipds->cp += ipds->advance;
 337                 ipds->len -= ipds->advance;
 338                 goto again;
 339
 340         case IPPROTO_ESP:
 341         {
 342                 int enh, padlen;
 343                 ipds->advance = esp_print(ndo, ipds->cp, ipds->len,
 344                                     (const u_char *)ipds->ip,
 345                                     &enh, &padlen);
 346                 if (ipds->advance <= 0)
 347                         break;
 348                 ipds->cp += ipds->advance;
 349                 ipds->len -= ipds->advance + padlen;
 350                 ipds->nh = enh & 0xff;
 351                 goto again;
 352         }
 353
 354         case IPPROTO_IPCOMP:
 355         {
 356                 int enh;
 357                 ipds->advance = ipcomp_print(ndo, ipds->cp, &enh);
 358                 if (ipds->advance <= 0)
 359                         break;
 360                 ipds->cp += ipds->advance;
 361                 ipds->len -= ipds->advance;
 362                 ipds->nh = enh & 0xff;
 363                 goto again;
 364         }
 365
 366         case IPPROTO_SCTP:
 367                 sctp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len);
 368                 break;
 369
 370         case IPPROTO_DCCP:
 371                 dccp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len);
 372                 break;
 373
 374         case IPPROTO_TCP:
 375                 /* pass on the MF bit plus the offset to detect fragments */
 376                 tcp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
 377                           ipds->off & (IP_MF|IP_OFFMASK));
 378                 break;
 379
 380         case IPPROTO_UDP:
 381                 /* pass on the MF bit plus the offset to detect fragments */
 382                 udp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
 383                           ipds->off & (IP_MF|IP_OFFMASK));
 384                 break;
 385
 386         case IPPROTO_ICMP:
 387                 /* pass on the MF bit plus the offset to detect fragments */
 388                 icmp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
 389                            ipds->off & (IP_MF|IP_OFFMASK));
 390                 break;
 391
 392         case IPPROTO_PIGP:
 393                 /*
 394                  * XXX - the current IANA protocol number assignments
 395                  * page lists 9 as "any private interior gateway
 396                  * (used by Cisco for their IGRP)" and 88 as
 397                  * "EIGRP" from Cisco.
 398                  *
 399                  * Recent BSD <netinet/in.h> headers define
 400                  * IP_PROTO_PIGP as 9 and IP_PROTO_IGRP as 88.
 401                  * We define IP_PROTO_PIGP as 9 and
 402                  * IP_PROTO_EIGRP as 88; those names better
 403                  * match was the current protocol number
 404                  * assignments say.
 405                  */
 406                 igrp_print(ndo, ipds->cp, ipds->len);
 407                 break;
 408
 409         case IPPROTO_EIGRP:
 410                 eigrp_print(ndo, ipds->cp, ipds->len);
 411                 break;
 412
 413         case IPPROTO_ND:
 414                 ND_PRINT((ndo, " nd %d", ipds->len));
 415                 break;
 416
 417         case IPPROTO_EGP:
 418                 egp_print(ndo, ipds->cp, ipds->len);
 419                 break;
 420
 421         case IPPROTO_OSPF:
 422                 ospf_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
 423                 break;
 424
 425         case IPPROTO_IGMP:
 426                 igmp_print(ndo, ipds->cp, ipds->len);
 427                 break;
 428
 429         case IPPROTO_IPV4:
 430                 /* DVMRP multicast tunnel (ip-in-ip encapsulation) */
 431                 ip_print(ndo, ipds->cp, ipds->len);
 432                 if (! ndo->ndo_vflag) {
 433                         ND_PRINT((ndo, " (ipip-proto-4)"));
 434                         return;
 435                 }
 436                 break;
 437
 438         case IPPROTO_IPV6:
 439                 /* ip6-in-ip encapsulation */
 440                 ip6_print(ndo, ipds->cp, ipds->len);
 441                 break;
 442
 443         case IPPROTO_RSVP:
 444                 rsvp_print(ndo, ipds->cp, ipds->len);
 445                 break;
 446
 447         case IPPROTO_GRE:
 448                 /* do it */
 449                 gre_print(ndo, ipds->cp, ipds->len);
 450                 break;
 451
 452         case IPPROTO_MOBILE:
 453                 mobile_print(ndo, ipds->cp, ipds->len);
 454                 break;
 455
 456         case IPPROTO_PIM:
 457                 pim_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
 458                 break;
 459
 460         case IPPROTO_VRRP:
 461                 if (ndo->ndo_packettype == PT_CARP) {
 462                         if (ndo->ndo_vflag)
 463                                 ND_PRINT((ndo, "carp %s > %s: ",
 464                                              ipaddr_string(ndo, &ipds->ip->ip_src),
 465                                              ipaddr_string(ndo, &ipds->ip->ip_dst)));
 466                         carp_print(ndo, ipds->cp, ipds->len, ipds->ip->ip_ttl);
 467                 } else {
 468                         if (ndo->ndo_vflag)
 469                                 ND_PRINT((ndo, "vrrp %s > %s: ",
 470                                              ipaddr_string(ndo, &ipds->ip->ip_src),
 471                                              ipaddr_string(ndo, &ipds->ip->ip_dst)));
 472                         vrrp_print(ndo, ipds->cp, ipds->len,
 473                                 (const u_char *)ipds->ip, ipds->ip->ip_ttl);
 474                 }
 475                 break;
 476
 477         case IPPROTO_PGM:
 478                 pgm_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
 479                 break;
 480
 481         default:
 482                 if (ndo->ndo_nflag==0 && (proto = getprotobynumber(ipds->nh)) != NULL)
 483                         ND_PRINT((ndo, " %s", proto->p_name));
 484                 else
 485                         ND_PRINT((ndo, " ip-proto-%d", ipds->nh));
 486                 ND_PRINT((ndo, " %d", ipds->len));
 487                 break;
 488         }
 489 }
 490
 491 void
 492 ip_print_inner(netdissect_options *ndo,
 493                const u_char *bp,
 494                u_int length, u_int nh,
 495                const u_char *bp2)
 496 {
 497         struct ip_print_demux_state  ipd;
 498
 499         ipd.ip = (const struct ip *)bp2;
 500         ipd.cp = bp;
 501         ipd.len  = length;
 502         ipd.off  = 0;
 503         ipd.nh   = nh;
 504         ipd.advance = 0;
 505
 506         ip_print_demux(ndo, &ipd);
 507 }
 508
 509
 510 /*
 511  * print an IP datagram.
 512  */
 513 void
 514 ip_print(netdissect_options *ndo,
 515          const u_char *bp,
 516          u_int length)
 517 {
 518         struct ip_print_demux_state  ipd;
 519         struct ip_print_demux_state *ipds=&ipd;
 520         const u_char *ipend;
 521         u_int hlen;
 522         struct cksum_vec vec[1];
 523         uint16_t sum, ip_sum;
 524         struct protoent *proto;
 525
 526         ipds->ip = (const struct ip *)bp;
 527         ND_TCHECK(ipds->ip->ip_vhl);
 528         if (IP_V(ipds->ip) != 4) { /* print version if != 4 */
 529             if (IP_V(ipds->ip) == 6)
 530               ND_PRINT((ndo, "IP6, wrong link-layer encapsulation "));
 531             else
 532               ND_PRINT((ndo, "IP%u ", IP_V(ipds->ip)));
 533         }
 534         else if (!ndo->ndo_eflag)
 535                 ND_PRINT((ndo, "IP "));
 536
 537         ND_TCHECK(*ipds->ip);
 538         if (length < sizeof (struct ip)) {
 539                 ND_PRINT((ndo, "truncated-ip %u", length));
 540                 return;
 541         }
 542         hlen = IP_HL(ipds->ip) * 4;
 543         if (hlen < sizeof (struct ip)) {
 544                 ND_PRINT((ndo, "bad-hlen %u", hlen));
 545                 return;
 546         }
 547
 548         ipds->len = EXTRACT_16BITS(&ipds->ip->ip_len);
 549         if (length < ipds->len)
 550                 ND_PRINT((ndo, "truncated-ip - %u bytes missing! ",
 551                         ipds->len - length));
 552         if (ipds->len < hlen) {
 553 #ifdef GUESS_TSO
 554             if (ipds->len) {
 555                 ND_PRINT((ndo, "bad-len %u", ipds->len));
 556                 return;
 557             }
 558             else {
 559                 /* we guess that it is a TSO send */
 560                 ipds->len = length;
 561             }
 562 #else
 563             ND_PRINT((ndo, "bad-len %u", ipds->len));
 564             return;
 565 #endif /* GUESS_TSO */
 566         }
 567
 568         /*
 569          * Cut off the snapshot length to the end of the IP payload.
 570          */
 571         ipend = bp + ipds->len;
 572         if (ipend < ndo->ndo_snapend)
 573                 ndo->ndo_snapend = ipend;
 574
 575         ipds->len -= hlen;
 576
 577         ipds->off = EXTRACT_16BITS(&ipds->ip->ip_off);
 578
 579         if (ndo->ndo_vflag) {
 580             ND_PRINT((ndo, "(tos 0x%x", (int)ipds->ip->ip_tos));
 581             /* ECN bits */
 582             if (ipds->ip->ip_tos & 0x03) {
 583                 switch (ipds->ip->ip_tos & 0x03) {
 584                 case 1:
 585                     ND_PRINT((ndo, ",ECT(1)"));
 586                     break;
 587                 case 2:
 588                     ND_PRINT((ndo, ",ECT(0)"));
 589                     break;
 590                 case 3:
 591                     ND_PRINT((ndo, ",CE"));
 592                 }
 593             }
 594
 595             if (ipds->ip->ip_ttl >= 1)
 596                 ND_PRINT((ndo, ", ttl %u", ipds->ip->ip_ttl));
 597
 598             /*
 599              * for the firewall guys, print id, offset.
 600              * On all but the last stick a "+" in the flags portion.
 601              * For unfragmented datagrams, note the don't fragment flag.
 602              */
 603
 604             ND_PRINT((ndo, ", id %u, offset %u, flags [%s], proto %s (%u)",
 605                          EXTRACT_16BITS(&ipds->ip->ip_id),
 606                          (ipds->off & 0x1fff) * 8,
 607                          bittok2str(ip_frag_values, "none", ipds->off&0xe000),
 608                          tok2str(ipproto_values,"unknown",ipds->ip->ip_p),
 609                          ipds->ip->ip_p));
 610
 611             ND_PRINT((ndo, ", length %u", EXTRACT_16BITS(&ipds->ip->ip_len)));
 612
 613             if ((hlen - sizeof(struct ip)) > 0) {
 614                 ND_PRINT((ndo, ", options ("));
 615                 ip_optprint(ndo, (u_char *)(ipds->ip + 1), hlen - sizeof(struct ip));
 616                 ND_PRINT((ndo, ")"));
 617             }
 618
 619             if (!ndo->ndo_Kflag && (u_char *)ipds->ip + hlen <= ndo->ndo_snapend) {
 620                 vec[0].ptr = (const uint8_t *)(void *)ipds->ip;
 621                 vec[0].len = hlen;
 622                 sum = in_cksum(vec, 1);
 623                 if (sum != 0) {
 624                     ip_sum = EXTRACT_16BITS(&ipds->ip->ip_sum);
 625                     ND_PRINT((ndo, ", bad cksum %x (->%x)!", ip_sum,
 626                              in_cksum_shouldbe(ip_sum, sum)));
 627                 }
 628             }
 629
 630                 ND_PRINT((ndo, ")\n    "));
 631         }
 632
 633         /*
 634          * If this is fragment zero, hand it to the next higher
 635          * level protocol.
 636          */
 637         if ((ipds->off & 0x1fff) == 0) {
 638                 ipds->cp = (const u_char *)ipds->ip + hlen;
 639                 ipds->nh = ipds->ip->ip_p;
 640
 641                 if (ipds->nh != IPPROTO_TCP && ipds->nh != IPPROTO_UDP &&
 642                     ipds->nh != IPPROTO_SCTP && ipds->nh != IPPROTO_DCCP) {
 643                         ND_PRINT((ndo, "%s > %s: ",
 644                                      ipaddr_string(ndo, &ipds->ip->ip_src),
 645                                      ipaddr_string(ndo, &ipds->ip->ip_dst)));
 646                 }
 647                 ip_print_demux(ndo, ipds);
 648         } else {
 649             /* Ultra quiet now means that all this stuff should be suppressed */
 650             if (ndo->ndo_qflag > 1) return;
 651
 652             /*
 653              * if this isn't the first frag, we're missing the
 654              * next level protocol header.  print the ip addr
 655              * and the protocol.
 656              */
 657                 if (ipds->off & 0x1fff) {
 658                         ND_PRINT((ndo, "%s > %s:", ipaddr_string(ndo, &ipds->ip->ip_src),
 659                                   ipaddr_string(ndo, &ipds->ip->ip_dst)));
 660                         if (!ndo->ndo_nflag && (proto = getprotobynumber(ipds->ip->ip_p)) != NULL)
 661                                 ND_PRINT((ndo, " %s", proto->p_name));
 662                         else
 663                                 ND_PRINT((ndo, " ip-proto-%d", ipds->ip->ip_p));
 664                 }
 665         }
 666         return;
 667
 668 trunc:
 669         ND_PRINT((ndo, "%s", tstr));
 670         return;
 671 }
 672
 673 void
 674 ipN_print(netdissect_options *ndo, register const u_char *bp, register u_int length)
 675 {
 676         struct ip hdr;
 677
 678         if (length < 4) {
 679                 ND_PRINT((ndo, "truncated-ip %d", length));
 680                 return;
 681         }
 682         memcpy (&hdr, bp, 4);
 683         switch (IP_V(&hdr)) {
 684         case 4:
 685                 ip_print (ndo, bp, length);
 686                 return;
 687         case 6:
 688                 ip6_print (ndo, bp, length);
 689                 return;
 690         default:
 691                 ND_PRINT((ndo, "unknown ip %d", IP_V(&hdr)));
 692                 return;
 693         }
 694 }
 695
 696 /*
 697  * Local Variables:
 698  * c-style: whitesmith
 699  * c-basic-offset: 8
 700  * End:
 701  */
 702
 703