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