contrib/tcpdump/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 /* \summary: IP printer */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include <netdissect-stdinc.h>
  29
  30 #include <string.h>
  31
  32 #include "netdissect.h"
  33 #include "addrtoname.h"
  34 #include "extract.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 int
  58 ip_printroute(netdissect_options *ndo,
  59               register const u_char *cp, u_int length)
  60 {
  61         register u_int ptr;
  62         register u_int len;
  63
  64         if (length < 3) {
  65                 ND_PRINT((ndo, " [bad length %u]", length));
  66                 return (0);
  67         }
  68         if ((length + 1) & 3)
  69                 ND_PRINT((ndo, " [bad length %u]", length));
  70         ND_TCHECK(cp[2]);
  71         ptr = cp[2] - 1;
  72         if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
  73                 ND_PRINT((ndo, " [bad ptr %u]", cp[2]));
  74
  75         for (len = 3; len < length; len += 4) {
  76                 ND_TCHECK2(cp[len], 4);
  77                 ND_PRINT((ndo, " %s", ipaddr_string(ndo, &cp[len])));
  78                 if (ptr > len)
  79                         ND_PRINT((ndo, ","));
  80         }
  81         return (0);
  82
  83 trunc:
  84         return (-1);
  85 }
  86
  87 /*
  88  * If source-routing is present and valid, return the final destination.
  89  * Otherwise, return IP destination.
  90  *
  91  * This is used for UDP and TCP pseudo-header in the checksum
  92  * calculation.
  93  */
  94 static uint32_t
  95 ip_finddst(netdissect_options *ndo,
  96            const struct ip *ip)
  97 {
  98         int length;
  99         int len;
 100         const u_char *cp;
 101         uint32_t retval;
 102
 103         cp = (const u_char *)(ip + 1);
 104         length = (IP_HL(ip) << 2) - sizeof(struct ip);
 105
 106         for (; length > 0; cp += len, length -= len) {
 107                 int tt;
 108
 109                 ND_TCHECK(*cp);
 110                 tt = *cp;
 111                 if (tt == IPOPT_EOL)
 112                         break;
 113                 else if (tt == IPOPT_NOP)
 114                         len = 1;
 115                 else {
 116                         ND_TCHECK(cp[1]);
 117                         len = cp[1];
 118                         if (len < 2)
 119                                 break;
 120                 }
 121                 ND_TCHECK2(*cp, len);
 122                 switch (tt) {
 123
 124                 case IPOPT_SSRR:
 125                 case IPOPT_LSRR:
 126                         if (len < 7)
 127                                 break;
 128                         UNALIGNED_MEMCPY(&retval, cp + len - 4, 4);
 129                         return retval;
 130                 }
 131         }
 132 trunc:
 133         UNALIGNED_MEMCPY(&retval, &ip->ip_dst, sizeof(uint32_t));
 134         return retval;
 135 }
 136
 137 /*
 138  * Compute a V4-style checksum by building a pseudoheader.
 139  */
 140 int
 141 nextproto4_cksum(netdissect_options *ndo,
 142                  const struct ip *ip, const uint8_t *data,
 143                  u_int len, u_int covlen, u_int next_proto)
 144 {
 145         struct phdr {
 146                 uint32_t src;
 147                 uint32_t dst;
 148                 u_char mbz;
 149                 u_char proto;
 150                 uint16_t len;
 151         } ph;
 152         struct cksum_vec vec[2];
 153
 154         /* pseudo-header.. */
 155         ph.len = htons((uint16_t)len);
 156         ph.mbz = 0;
 157         ph.proto = next_proto;
 158         UNALIGNED_MEMCPY(&ph.src, &ip->ip_src, sizeof(uint32_t));
 159         if (IP_HL(ip) == 5)
 160                 UNALIGNED_MEMCPY(&ph.dst, &ip->ip_dst, sizeof(uint32_t));
 161         else
 162                 ph.dst = ip_finddst(ndo, ip);
 163
 164         vec[0].ptr = (const uint8_t *)(void *)&ph;
 165         vec[0].len = sizeof(ph);
 166         vec[1].ptr = data;
 167         vec[1].len = covlen;
 168         return (in_cksum(vec, 2));
 169 }
 170
 171 static int
 172 ip_printts(netdissect_options *ndo,
 173            register const u_char *cp, u_int length)
 174 {
 175         register u_int ptr;
 176         register u_int len;
 177         int hoplen;
 178         const char *type;
 179
 180         if (length < 4) {
 181                 ND_PRINT((ndo, "[bad length %u]", length));
 182                 return (0);
 183         }
 184         ND_PRINT((ndo, " TS{"));
 185         hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
 186         if ((length - 4) & (hoplen-1))
 187                 ND_PRINT((ndo, "[bad length %u]", length));
 188         ND_TCHECK(cp[2]);
 189         ptr = cp[2] - 1;
 190         len = 0;
 191         if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
 192                 ND_PRINT((ndo, "[bad ptr %u]", cp[2]));
 193         ND_TCHECK(cp[3]);
 194         switch (cp[3]&0xF) {
 195         case IPOPT_TS_TSONLY:
 196                 ND_PRINT((ndo, "TSONLY"));
 197                 break;
 198         case IPOPT_TS_TSANDADDR:
 199                 ND_PRINT((ndo, "TS+ADDR"));
 200                 break;
 201         /*
 202          * prespecified should really be 3, but some ones might send 2
 203          * instead, and the IPOPT_TS_PRESPEC constant can apparently
 204          * have both values, so we have to hard-code it here.
 205          */
 206
 207         case 2:
 208                 ND_PRINT((ndo, "PRESPEC2.0"));
 209                 break;
 210         case 3:                 /* IPOPT_TS_PRESPEC */
 211                 ND_PRINT((ndo, "PRESPEC"));
 212                 break;
 213         default:
 214                 ND_PRINT((ndo, "[bad ts type %d]", cp[3]&0xF));
 215                 goto done;
 216         }
 217
 218         type = " ";
 219         for (len = 4; len < length; len += hoplen) {
 220                 if (ptr == len)
 221                         type = " ^ ";
 222                 ND_TCHECK2(cp[len], hoplen);
 223                 ND_PRINT((ndo, "%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
 224                        hoplen!=8 ? "" : ipaddr_string(ndo, &cp[len])));
 225                 type = " ";
 226         }
 227
 228 done:
 229         ND_PRINT((ndo, "%s", ptr == len ? " ^ " : ""));
 230
 231         if (cp[3]>>4)
 232                 ND_PRINT((ndo, " [%d hops not recorded]} ", cp[3]>>4));
 233         else
 234                 ND_PRINT((ndo, "}"));
 235         return (0);
 236
 237 trunc:
 238         return (-1);
 239 }
 240
 241 /*
 242  * print IP options.
 243  */
 244 static void
 245 ip_optprint(netdissect_options *ndo,
 246             register const u_char *cp, u_int length)
 247 {
 248         register u_int option_len;
 249         const char *sep = "";
 250
 251         for (; length > 0; cp += option_len, length -= option_len) {
 252                 u_int option_code;
 253
 254                 ND_PRINT((ndo, "%s", sep));
 255                 sep = ",";
 256
 257                 ND_TCHECK(*cp);
 258                 option_code = *cp;
 259
 260                 ND_PRINT((ndo, "%s",
 261                           tok2str(ip_option_values,"unknown %u",option_code)));
 262
 263                 if (option_code == IPOPT_NOP ||
 264                     option_code == IPOPT_EOL)
 265                         option_len = 1;
 266
 267                 else {
 268                         ND_TCHECK(cp[1]);
 269                         option_len = cp[1];
 270                         if (option_len < 2) {
 271                                 ND_PRINT((ndo, " [bad length %u]", option_len));
 272                                 return;
 273                         }
 274                 }
 275
 276                 if (option_len > length) {
 277                         ND_PRINT((ndo, " [bad length %u]", option_len));
 278                         return;
 279                 }
 280
 281                 ND_TCHECK2(*cp, option_len);
 282
 283                 switch (option_code) {
 284                 case IPOPT_EOL:
 285                         return;
 286
 287                 case IPOPT_TS:
 288                         if (ip_printts(ndo, cp, option_len) == -1)
 289                                 goto trunc;
 290                         break;
 291
 292                 case IPOPT_RR:       /* fall through */
 293                 case IPOPT_SSRR:
 294                 case IPOPT_LSRR:
 295                         if (ip_printroute(ndo, cp, option_len) == -1)
 296                                 goto trunc;
 297                         break;
 298
 299                 case IPOPT_RA:
 300                         if (option_len < 4) {
 301                                 ND_PRINT((ndo, " [bad length %u]", option_len));
 302                                 break;
 303                         }
 304                         ND_TCHECK(cp[3]);
 305                         if (EXTRACT_16BITS(&cp[2]) != 0)
 306                                 ND_PRINT((ndo, " value %u", EXTRACT_16BITS(&cp[2])));
 307                         break;
 308
 309                 case IPOPT_NOP:       /* nothing to print - fall through */
 310                 case IPOPT_SECURITY:
 311                 default:
 312                         break;
 313                 }
 314         }
 315         return;
 316
 317 trunc:
 318         ND_PRINT((ndo, "%s", tstr));
 319 }
 320
 321 #define IP_RES 0x8000
 322
 323 static const struct tok ip_frag_values[] = {
 324         { IP_MF,        "+" },
 325         { IP_DF,        "DF" },
 326         { IP_RES,       "rsvd" }, /* The RFC3514 evil ;-) bit */
 327         { 0,            NULL }
 328 };
 329
 330 struct ip_print_demux_state {
 331         const struct ip *ip;
 332         const u_char *cp;
 333         u_int   len, off;
 334         u_char  nh;
 335         int     advance;
 336 };
 337
 338 static void
 339 ip_print_demux(netdissect_options *ndo,
 340                struct ip_print_demux_state *ipds)
 341 {
 342         const char *p_name;
 343
 344 again:
 345         switch (ipds->nh) {
 346
 347         case IPPROTO_AH:
 348                 if (!ND_TTEST(*ipds->cp)) {
 349                         ND_PRINT((ndo, "[|AH]"));
 350                         break;
 351                 }
 352                 ipds->nh = *ipds->cp;
 353                 ipds->advance = ah_print(ndo, ipds->cp);
 354                 if (ipds->advance <= 0)
 355                         break;
 356                 ipds->cp += ipds->advance;
 357                 ipds->len -= ipds->advance;
 358                 goto again;
 359
 360         case IPPROTO_ESP:
 361         {
 362                 int enh, padlen;
 363                 ipds->advance = esp_print(ndo, ipds->cp, ipds->len,
 364                                     (const u_char *)ipds->ip,
 365                                     &enh, &padlen);
 366                 if (ipds->advance <= 0)
 367                         break;
 368                 ipds->cp += ipds->advance;
 369                 ipds->len -= ipds->advance + padlen;
 370                 ipds->nh = enh & 0xff;
 371                 goto again;
 372         }
 373
 374         case IPPROTO_IPCOMP:
 375         {
 376                 ipcomp_print(ndo, ipds->cp);
 377                 /*
 378                  * Either this has decompressed the payload and
 379                  * printed it, in which case there's nothing more
 380                  * to do, or it hasn't, in which case there's
 381                  * nothing more to do.
 382                  */
 383                 break;
 384         }
 385
 386         case IPPROTO_SCTP:
 387                 sctp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len);
 388                 break;
 389
 390         case IPPROTO_DCCP:
 391                 dccp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len);
 392                 break;
 393
 394         case IPPROTO_TCP:
 395                 /* pass on the MF bit plus the offset to detect fragments */
 396                 tcp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
 397                           ipds->off & (IP_MF|IP_OFFMASK));
 398                 break;
 399
 400         case IPPROTO_UDP:
 401                 /* pass on the MF bit plus the offset to detect fragments */
 402                 udp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
 403                           ipds->off & (IP_MF|IP_OFFMASK));
 404                 break;
 405
 406         case IPPROTO_ICMP:
 407                 /* pass on the MF bit plus the offset to detect fragments */
 408                 icmp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
 409                            ipds->off & (IP_MF|IP_OFFMASK));
 410                 break;
 411
 412         case IPPROTO_PIGP:
 413                 /*
 414                  * XXX - the current IANA protocol number assignments
 415                  * page lists 9 as "any private interior gateway
 416                  * (used by Cisco for their IGRP)" and 88 as
 417                  * "EIGRP" from Cisco.
 418                  *
 419                  * Recent BSD <netinet/in.h> headers define
 420                  * IP_PROTO_PIGP as 9 and IP_PROTO_IGRP as 88.
 421                  * We define IP_PROTO_PIGP as 9 and
 422                  * IP_PROTO_EIGRP as 88; those names better
 423                  * match was the current protocol number
 424                  * assignments say.
 425                  */
 426                 igrp_print(ndo, ipds->cp, ipds->len);
 427                 break;
 428
 429         case IPPROTO_EIGRP:
 430                 eigrp_print(ndo, ipds->cp, ipds->len);
 431                 break;
 432
 433         case IPPROTO_ND:
 434                 ND_PRINT((ndo, " nd %d", ipds->len));
 435                 break;
 436
 437         case IPPROTO_EGP:
 438                 egp_print(ndo, ipds->cp, ipds->len);
 439                 break;
 440
 441         case IPPROTO_OSPF:
 442                 ospf_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
 443                 break;
 444
 445         case IPPROTO_IGMP:
 446                 igmp_print(ndo, ipds->cp, ipds->len);
 447                 break;
 448
 449         case IPPROTO_IPV4:
 450                 /* DVMRP multicast tunnel (ip-in-ip encapsulation) */
 451                 ip_print(ndo, ipds->cp, ipds->len);
 452                 if (! ndo->ndo_vflag) {
 453                         ND_PRINT((ndo, " (ipip-proto-4)"));
 454                         return;
 455                 }
 456                 break;
 457
 458         case IPPROTO_IPV6:
 459                 /* ip6-in-ip encapsulation */
 460                 ip6_print(ndo, ipds->cp, ipds->len);
 461                 break;
 462
 463         case IPPROTO_RSVP:
 464                 rsvp_print(ndo, ipds->cp, ipds->len);
 465                 break;
 466
 467         case IPPROTO_GRE:
 468                 /* do it */
 469                 gre_print(ndo, ipds->cp, ipds->len);
 470                 break;
 471
 472         case IPPROTO_MOBILE:
 473                 mobile_print(ndo, ipds->cp, ipds->len);
 474                 break;
 475
 476         case IPPROTO_PIM:
 477                 pim_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
 478                 break;
 479
 480         case IPPROTO_VRRP:
 481                 if (ndo->ndo_packettype == PT_CARP) {
 482                         if (ndo->ndo_vflag)
 483                                 ND_PRINT((ndo, "carp %s > %s: ",
 484                                              ipaddr_string(ndo, &ipds->ip->ip_src),
 485                                              ipaddr_string(ndo, &ipds->ip->ip_dst)));
 486                         carp_print(ndo, ipds->cp, ipds->len, ipds->ip->ip_ttl);
 487                 } else {
 488                         if (ndo->ndo_vflag)
 489                                 ND_PRINT((ndo, "vrrp %s > %s: ",
 490                                              ipaddr_string(ndo, &ipds->ip->ip_src),
 491                                              ipaddr_string(ndo, &ipds->ip->ip_dst)));
 492                         vrrp_print(ndo, ipds->cp, ipds->len,
 493                                 (const u_char *)ipds->ip, ipds->ip->ip_ttl);
 494                 }
 495                 break;
 496
 497         case IPPROTO_PGM:
 498                 pgm_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
 499                 break;
 500
 501         default:
 502                 if (ndo->ndo_nflag==0 && (p_name = netdb_protoname(ipds->nh)) != NULL)
 503                         ND_PRINT((ndo, " %s", p_name));
 504                 else
 505                         ND_PRINT((ndo, " ip-proto-%d", ipds->nh));
 506                 ND_PRINT((ndo, " %d", ipds->len));
 507                 break;
 508         }
 509 }
 510
 511 void
 512 ip_print_inner(netdissect_options *ndo,
 513                const u_char *bp,
 514                u_int length, u_int nh,
 515                const u_char *bp2)
 516 {
 517         struct ip_print_demux_state  ipd;
 518
 519         ipd.ip = (const struct ip *)bp2;
 520         ipd.cp = bp;
 521         ipd.len  = length;
 522         ipd.off  = 0;
 523         ipd.nh   = nh;
 524         ipd.advance = 0;
 525
 526         ip_print_demux(ndo, &ipd);
 527 }
 528
 529
 530 /*
 531  * print an IP datagram.
 532  */
 533 void
 534 ip_print(netdissect_options *ndo,
 535          const u_char *bp,
 536          u_int length)
 537 {
 538         struct ip_print_demux_state  ipd;
 539         struct ip_print_demux_state *ipds=&ipd;
 540         const u_char *ipend;
 541         u_int hlen;
 542         struct cksum_vec vec[1];
 543         uint16_t sum, ip_sum;
 544         const char *p_name;
 545
 546         ipds->ip = (const struct ip *)bp;
 547         ND_TCHECK(ipds->ip->ip_vhl);
 548         if (IP_V(ipds->ip) != 4) { /* print version and fail if != 4 */
 549             if (IP_V(ipds->ip) == 6)
 550               ND_PRINT((ndo, "IP6, wrong link-layer encapsulation "));
 551             else
 552               ND_PRINT((ndo, "IP%u ", IP_V(ipds->ip)));
 553             return;
 554         }
 555         if (!ndo->ndo_eflag)
 556                 ND_PRINT((ndo, "IP "));
 557
 558         ND_TCHECK(*ipds->ip);
 559         if (length < sizeof (struct ip)) {
 560                 ND_PRINT((ndo, "truncated-ip %u", length));
 561                 return;
 562         }
 563         hlen = IP_HL(ipds->ip) * 4;
 564         if (hlen < sizeof (struct ip)) {
 565                 ND_PRINT((ndo, "bad-hlen %u", hlen));
 566                 return;
 567         }
 568
 569         ipds->len = EXTRACT_16BITS(&ipds->ip->ip_len);
 570         if (length < ipds->len)
 571                 ND_PRINT((ndo, "truncated-ip - %u bytes missing! ",
 572                         ipds->len - length));
 573         if (ipds->len < hlen) {
 574 #ifdef GUESS_TSO
 575             if (ipds->len) {
 576                 ND_PRINT((ndo, "bad-len %u", ipds->len));
 577                 return;
 578             }
 579             else {
 580                 /* we guess that it is a TSO send */
 581                 ipds->len = length;
 582             }
 583 #else
 584             ND_PRINT((ndo, "bad-len %u", ipds->len));
 585             return;
 586 #endif /* GUESS_TSO */
 587         }
 588
 589         /*
 590          * Cut off the snapshot length to the end of the IP payload.
 591          */
 592         ipend = bp + ipds->len;
 593         if (ipend < ndo->ndo_snapend)
 594                 ndo->ndo_snapend = ipend;
 595
 596         ipds->len -= hlen;
 597
 598         ipds->off = EXTRACT_16BITS(&ipds->ip->ip_off);
 599
 600         if (ndo->ndo_vflag) {
 601             ND_PRINT((ndo, "(tos 0x%x", (int)ipds->ip->ip_tos));
 602             /* ECN bits */
 603             switch (ipds->ip->ip_tos & 0x03) {
 604
 605             case 0:
 606                 break;
 607
 608             case 1:
 609                 ND_PRINT((ndo, ",ECT(1)"));
 610                 break;
 611
 612             case 2:
 613                 ND_PRINT((ndo, ",ECT(0)"));
 614                 break;
 615
 616             case 3:
 617                 ND_PRINT((ndo, ",CE"));
 618                 break;
 619             }
 620
 621             if (ipds->ip->ip_ttl >= 1)
 622                 ND_PRINT((ndo, ", ttl %u", ipds->ip->ip_ttl));
 623
 624             /*
 625              * for the firewall guys, print id, offset.
 626              * On all but the last stick a "+" in the flags portion.
 627              * For unfragmented datagrams, note the don't fragment flag.
 628              */
 629
 630             ND_PRINT((ndo, ", id %u, offset %u, flags [%s], proto %s (%u)",
 631                          EXTRACT_16BITS(&ipds->ip->ip_id),
 632                          (ipds->off & 0x1fff) * 8,
 633                          bittok2str(ip_frag_values, "none", ipds->off&0xe000),
 634                          tok2str(ipproto_values,"unknown",ipds->ip->ip_p),
 635                          ipds->ip->ip_p));
 636
 637             ND_PRINT((ndo, ", length %u", EXTRACT_16BITS(&ipds->ip->ip_len)));
 638
 639             if ((hlen - sizeof(struct ip)) > 0) {
 640                 ND_PRINT((ndo, ", options ("));
 641                 ip_optprint(ndo, (const u_char *)(ipds->ip + 1), hlen - sizeof(struct ip));
 642                 ND_PRINT((ndo, ")"));
 643             }
 644
 645             if (!ndo->ndo_Kflag && (const u_char *)ipds->ip + hlen <= ndo->ndo_snapend) {
 646                 vec[0].ptr = (const uint8_t *)(const void *)ipds->ip;
 647                 vec[0].len = hlen;
 648                 sum = in_cksum(vec, 1);
 649                 if (sum != 0) {
 650                     ip_sum = EXTRACT_16BITS(&ipds->ip->ip_sum);
 651                     ND_PRINT((ndo, ", bad cksum %x (->%x)!", ip_sum,
 652                              in_cksum_shouldbe(ip_sum, sum)));
 653                 }
 654             }
 655
 656                 ND_PRINT((ndo, ")\n    "));
 657         }
 658
 659         /*
 660          * If this is fragment zero, hand it to the next higher
 661          * level protocol.
 662          */
 663         if ((ipds->off & 0x1fff) == 0) {
 664                 ipds->cp = (const u_char *)ipds->ip + hlen;
 665                 ipds->nh = ipds->ip->ip_p;
 666
 667                 if (ipds->nh != IPPROTO_TCP && ipds->nh != IPPROTO_UDP &&
 668                     ipds->nh != IPPROTO_SCTP && ipds->nh != IPPROTO_DCCP) {
 669                         ND_PRINT((ndo, "%s > %s: ",
 670                                      ipaddr_string(ndo, &ipds->ip->ip_src),
 671                                      ipaddr_string(ndo, &ipds->ip->ip_dst)));
 672                 }
 673                 ip_print_demux(ndo, ipds);
 674         } else {
 675                 /*
 676                  * Ultra quiet now means that all this stuff should be
 677                  * suppressed.
 678                  */
 679                 if (ndo->ndo_qflag > 1)
 680                         return;
 681
 682                 /*
 683                  * This isn't the first frag, so we're missing the
 684                  * next level protocol header.  print the ip addr
 685                  * and the protocol.
 686                  */
 687                 ND_PRINT((ndo, "%s > %s:", ipaddr_string(ndo, &ipds->ip->ip_src),
 688                           ipaddr_string(ndo, &ipds->ip->ip_dst)));
 689                 if (!ndo->ndo_nflag && (p_name = netdb_protoname(ipds->ip->ip_p)) != NULL)
 690                         ND_PRINT((ndo, " %s", p_name));
 691                 else
 692                         ND_PRINT((ndo, " ip-proto-%d", ipds->ip->ip_p));
 693         }
 694         return;
 695
 696 trunc:
 697         ND_PRINT((ndo, "%s", tstr));
 698         return;
 699 }
 700
 701 void
 702 ipN_print(netdissect_options *ndo, register const u_char *bp, register u_int length)
 703 {
 704         if (length < 1) {
 705                 ND_PRINT((ndo, "truncated-ip %d", length));
 706                 return;
 707         }
 708
 709         ND_TCHECK(*bp);
 710         switch (*bp & 0xF0) {
 711         case 0x40:
 712                 ip_print (ndo, bp, length);
 713                 break;
 714         case 0x60:
 715                 ip6_print (ndo, bp, length);
 716                 break;
 717         default:
 718                 ND_PRINT((ndo, "unknown ip %d", (*bp & 0xF0) >> 4));
 719                 break;
 720         }
 721         return;
 722
 723 trunc:
 724         ND_PRINT((ndo, "%s", tstr));
 725         return;
 726 }
 727
 728 /*
 729  * Local Variables:
 730  * c-style: whitesmith
 731  * c-basic-offset: 8
 732  * End:
 733  */
 734
 735