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
  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 int
  57 ip_printroute(netdissect_options *ndo,
  58               const u_char *cp, u_int length)
  59 {
  60         u_int ptr;
  61         u_int len;
  62
  63         if (length < 3) {
  64                 ND_PRINT(" [bad length %u]", length);
  65                 return (0);
  66         }
  67         if ((length + 1) & 3)
  68                 ND_PRINT(" [bad length %u]", length);
  69         ND_TCHECK_1(cp + 2);
  70         ptr = EXTRACT_U_1(cp + 2) - 1;
  71         if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
  72                 ND_PRINT(" [bad ptr %u]", EXTRACT_U_1(cp + 2));
  73
  74         for (len = 3; len < length; len += 4) {
  75                 ND_TCHECK_4(cp + len);
  76                 ND_PRINT(" %s", ipaddr_string(ndo, cp + len));
  77                 if (ptr > len)
  78                         ND_PRINT(",");
  79         }
  80         return (0);
  81
  82 trunc:
  83         return (-1);
  84 }
  85
  86 /*
  87  * If source-routing is present and valid, return the final destination.
  88  * Otherwise, return IP destination.
  89  *
  90  * This is used for UDP and TCP pseudo-header in the checksum
  91  * calculation.
  92  */
  93 static uint32_t
  94 ip_finddst(netdissect_options *ndo,
  95            const struct ip *ip)
  96 {
  97         u_int length;
  98         u_int len;
  99         const u_char *cp;
 100
 101         cp = (const u_char *)(ip + 1);
 102         length = (IP_HL(ip) << 2);
 103         if (length < sizeof(struct ip))
 104                 goto trunc;
 105         length -= sizeof(struct ip);
 106
 107         for (; length != 0; cp += len, length -= len) {
 108                 int tt;
 109
 110                 ND_TCHECK_1(cp);
 111                 tt = EXTRACT_U_1(cp);
 112                 if (tt == IPOPT_EOL)
 113                         break;
 114                 else if (tt == IPOPT_NOP)
 115                         len = 1;
 116                 else {
 117                         ND_TCHECK_1(cp + 1);
 118                         len = EXTRACT_U_1(cp + 1);
 119                         if (len < 2)
 120                                 break;
 121                 }
 122                 if (length < len)
 123                         goto trunc;
 124                 ND_TCHECK_LEN(cp, len);
 125                 switch (tt) {
 126
 127                 case IPOPT_SSRR:
 128                 case IPOPT_LSRR:
 129                         if (len < 7)
 130                                 break;
 131                         return (EXTRACT_IPV4_TO_NETWORK_ORDER(cp + len - 4));
 132                 }
 133         }
 134 trunc:
 135         return (EXTRACT_IPV4_TO_NETWORK_ORDER(ip->ip_dst));
 136 }
 137
 138 /*
 139  * Compute a V4-style checksum by building a pseudoheader.
 140  */
 141 int
 142 nextproto4_cksum(netdissect_options *ndo,
 143                  const struct ip *ip, const uint8_t *data,
 144                  u_int len, u_int covlen, u_int next_proto)
 145 {
 146         struct phdr {
 147                 uint32_t src;
 148                 uint32_t dst;
 149                 u_char mbz;
 150                 u_char proto;
 151                 uint16_t len;
 152         } ph;
 153         struct cksum_vec vec[2];
 154
 155         /* pseudo-header.. */
 156         ph.len = htons((uint16_t)len);
 157         ph.mbz = 0;
 158         ph.proto = next_proto;
 159         ph.src = EXTRACT_IPV4_TO_NETWORK_ORDER(ip->ip_src);
 160         if (IP_HL(ip) == 5)
 161                 ph.dst = EXTRACT_IPV4_TO_NETWORK_ORDER(ip->ip_dst);
 162         else
 163                 ph.dst = ip_finddst(ndo, ip);
 164
 165         vec[0].ptr = (const uint8_t *)(void *)&ph;
 166         vec[0].len = sizeof(ph);
 167         vec[1].ptr = data;
 168         vec[1].len = covlen;
 169         return (in_cksum(vec, 2));
 170 }
 171
 172 static int
 173 ip_printts(netdissect_options *ndo,
 174            const u_char *cp, u_int length)
 175 {
 176         u_int ptr;
 177         u_int len;
 178         u_int hoplen;
 179         const char *type;
 180
 181         if (length < 4) {
 182                 ND_PRINT("[bad length %u]", length);
 183                 return (0);
 184         }
 185         ND_PRINT(" TS{");
 186         ND_TCHECK_1(cp + 3);
 187         hoplen = ((EXTRACT_U_1(cp + 3) & 0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
 188         if ((length - 4) & (hoplen-1))
 189                 ND_PRINT("[bad length %u]", length);
 190         ND_TCHECK_1(cp + 2);
 191         ptr = EXTRACT_U_1(cp + 2) - 1;
 192         len = 0;
 193         if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
 194                 ND_PRINT("[bad ptr %u]", EXTRACT_U_1(cp + 2));
 195         ND_TCHECK_1(cp + 3);
 196         switch (EXTRACT_U_1(cp + 3)&0xF) {
 197         case IPOPT_TS_TSONLY:
 198                 ND_PRINT("TSONLY");
 199                 break;
 200         case IPOPT_TS_TSANDADDR:
 201                 ND_PRINT("TS+ADDR");
 202                 break;
 203         /*
 204          * prespecified should really be 3, but some ones might send 2
 205          * instead, and the IPOPT_TS_PRESPEC constant can apparently
 206          * have both values, so we have to hard-code it here.
 207          */
 208
 209         case 2:
 210                 ND_PRINT("PRESPEC2.0");
 211                 break;
 212         case 3:                 /* IPOPT_TS_PRESPEC */
 213                 ND_PRINT("PRESPEC");
 214                 break;
 215         default:
 216                 ND_PRINT("[bad ts type %u]", EXTRACT_U_1(cp + 3)&0xF);
 217                 goto done;
 218         }
 219
 220         type = " ";
 221         for (len = 4; len < length; len += hoplen) {
 222                 if (ptr == len)
 223                         type = " ^ ";
 224                 ND_TCHECK_LEN(cp + len, hoplen);
 225                 ND_PRINT("%s%u@%s", type, EXTRACT_BE_U_4(cp + len + hoplen - 4),
 226                           hoplen!=8 ? "" : ipaddr_string(ndo, cp + len));
 227                 type = " ";
 228         }
 229
 230 done:
 231         ND_PRINT("%s", ptr == len ? " ^ " : "");
 232
 233         if (EXTRACT_U_1(cp + 3) >> 4)
 234                 ND_PRINT(" [%u hops not recorded]} ", EXTRACT_U_1(cp + 3)>>4);
 235         else
 236                 ND_PRINT("}");
 237         return (0);
 238
 239 trunc:
 240         return (-1);
 241 }
 242
 243 /*
 244  * print IP options.
 245  */
 246 static void
 247 ip_optprint(netdissect_options *ndo,
 248             const u_char *cp, u_int length)
 249 {
 250         u_int option_len;
 251         const char *sep = "";
 252
 253         for (; length > 0; cp += option_len, length -= option_len) {
 254                 u_int option_code;
 255
 256                 ND_PRINT("%s", sep);
 257                 sep = ",";
 258
 259                 ND_TCHECK_1(cp);
 260                 option_code = EXTRACT_U_1(cp);
 261
 262                 ND_PRINT("%s",
 263                           tok2str(ip_option_values,"unknown %u",option_code));
 264
 265                 if (option_code == IPOPT_NOP ||
 266                     option_code == IPOPT_EOL)
 267                         option_len = 1;
 268
 269                 else {
 270                         ND_TCHECK_1(cp + 1);
 271                         option_len = EXTRACT_U_1(cp + 1);
 272                         if (option_len < 2) {
 273                                 ND_PRINT(" [bad length %u]", option_len);
 274                                 return;
 275                         }
 276                 }
 277
 278                 if (option_len > length) {
 279                         ND_PRINT(" [bad length %u]", option_len);
 280                         return;
 281                 }
 282
 283                 ND_TCHECK_LEN(cp, option_len);
 284
 285                 switch (option_code) {
 286                 case IPOPT_EOL:
 287                         return;
 288
 289                 case IPOPT_TS:
 290                         if (ip_printts(ndo, cp, option_len) == -1)
 291                                 goto trunc;
 292                         break;
 293
 294                 case IPOPT_RR:       /* fall through */
 295                 case IPOPT_SSRR:
 296                 case IPOPT_LSRR:
 297                         if (ip_printroute(ndo, cp, option_len) == -1)
 298                                 goto trunc;
 299                         break;
 300
 301                 case IPOPT_RA:
 302                         if (option_len < 4) {
 303                                 ND_PRINT(" [bad length %u]", option_len);
 304                                 break;
 305                         }
 306                         ND_TCHECK_1(cp + 3);
 307                         if (EXTRACT_BE_U_2(cp + 2) != 0)
 308                                 ND_PRINT(" value %u", EXTRACT_BE_U_2(cp + 2));
 309                         break;
 310
 311                 case IPOPT_NOP:       /* nothing to print - fall through */
 312                 case IPOPT_SECURITY:
 313                 default:
 314                         break;
 315                 }
 316         }
 317         return;
 318
 319 trunc:
 320         nd_print_trunc(ndo);
 321 }
 322
 323 #define IP_RES 0x8000
 324
 325 static const struct tok ip_frag_values[] = {
 326         { IP_MF,        "+" },
 327         { IP_DF,        "DF" },
 328         { IP_RES,       "rsvd" }, /* The RFC3514 evil ;-) bit */
 329         { 0,            NULL }
 330 };
 331
 332 struct ip_print_demux_state {
 333         const struct ip *ip;
 334         const u_char *cp;
 335         u_int   len, off;
 336         u_char  nh;
 337         int     advance;
 338 };
 339
 340 static void
 341 ip_print_demux(netdissect_options *ndo,
 342                struct ip_print_demux_state *ipds)
 343 {
 344         const char *p_name;
 345
 346 again:
 347         switch (ipds->nh) {
 348
 349         case IPPROTO_AH:
 350                 if (!ND_TTEST_1(ipds->cp)) {
 351                         ND_PRINT("[|AH]");
 352                         break;
 353                 }
 354                 ipds->nh = EXTRACT_U_1(ipds->cp);
 355                 ipds->advance = ah_print(ndo, ipds->cp);
 356                 if (ipds->advance <= 0)
 357                         break;
 358                 ipds->cp += ipds->advance;
 359                 ipds->len -= ipds->advance;
 360                 goto again;
 361
 362         case IPPROTO_ESP:
 363         {
 364                 u_int enh, padlen;
 365                 ipds->advance = esp_print(ndo, ipds->cp, ipds->len,
 366                                     (const u_char *)ipds->ip,
 367                                     &enh, &padlen);
 368                 if (ipds->advance <= 0)
 369                         break;
 370                 ipds->cp += ipds->advance;
 371                 ipds->len -= ipds->advance + padlen;
 372                 ipds->nh = enh & 0xff;
 373                 goto again;
 374         }
 375
 376         case IPPROTO_IPCOMP:
 377         {
 378                 ipcomp_print(ndo, ipds->cp);
 379                 /*
 380                  * Either this has decompressed the payload and
 381                  * printed it, in which case there's nothing more
 382                  * to do, or it hasn't, in which case there's
 383                  * nothing more to do.
 384                  */
 385                 break;
 386         }
 387
 388         case IPPROTO_SCTP:
 389                 sctp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len);
 390                 break;
 391
 392         case IPPROTO_DCCP:
 393                 dccp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len);
 394                 break;
 395
 396         case IPPROTO_TCP:
 397                 /* pass on the MF bit plus the offset to detect fragments */
 398                 tcp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
 399                           ipds->off & (IP_MF|IP_OFFMASK));
 400                 break;
 401
 402         case IPPROTO_UDP:
 403                 /* pass on the MF bit plus the offset to detect fragments */
 404                 udp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
 405                           ipds->off & (IP_MF|IP_OFFMASK));
 406                 break;
 407
 408         case IPPROTO_ICMP:
 409                 /* pass on the MF bit plus the offset to detect fragments */
 410                 icmp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
 411                            ipds->off & (IP_MF|IP_OFFMASK));
 412                 break;
 413
 414         case IPPROTO_PIGP:
 415                 /*
 416                  * XXX - the current IANA protocol number assignments
 417                  * page lists 9 as "any private interior gateway
 418                  * (used by Cisco for their IGRP)" and 88 as
 419                  * "EIGRP" from Cisco.
 420                  *
 421                  * Recent BSD <netinet/in.h> headers define
 422                  * IP_PROTO_PIGP as 9 and IP_PROTO_IGRP as 88.
 423                  * We define IP_PROTO_PIGP as 9 and
 424                  * IP_PROTO_EIGRP as 88; those names better
 425                  * match was the current protocol number
 426                  * assignments say.
 427                  */
 428                 igrp_print(ndo, ipds->cp, ipds->len);
 429                 break;
 430
 431         case IPPROTO_EIGRP:
 432                 eigrp_print(ndo, ipds->cp, ipds->len);
 433                 break;
 434
 435         case IPPROTO_ND:
 436                 ND_PRINT(" nd %u", ipds->len);
 437                 break;
 438
 439         case IPPROTO_EGP:
 440                 egp_print(ndo, ipds->cp, ipds->len);
 441                 break;
 442
 443         case IPPROTO_OSPF:
 444                 ospf_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
 445                 break;
 446
 447         case IPPROTO_IGMP:
 448                 igmp_print(ndo, ipds->cp, ipds->len);
 449                 break;
 450
 451         case IPPROTO_IPV4:
 452                 /* DVMRP multicast tunnel (ip-in-ip encapsulation) */
 453                 ip_print(ndo, ipds->cp, ipds->len);
 454                 if (! ndo->ndo_vflag) {
 455                         ND_PRINT(" (ipip-proto-4)");
 456                         return;
 457                 }
 458                 break;
 459
 460         case IPPROTO_IPV6:
 461                 /* ip6-in-ip encapsulation */
 462                 ip6_print(ndo, ipds->cp, ipds->len);
 463                 break;
 464
 465         case IPPROTO_RSVP:
 466                 rsvp_print(ndo, ipds->cp, ipds->len);
 467                 break;
 468
 469         case IPPROTO_GRE:
 470                 /* do it */
 471                 gre_print(ndo, ipds->cp, ipds->len);
 472                 break;
 473
 474         case IPPROTO_MOBILE:
 475                 mobile_print(ndo, ipds->cp, ipds->len);
 476                 break;
 477
 478         case IPPROTO_PIM:
 479                 pim_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
 480                 break;
 481
 482         case IPPROTO_VRRP:
 483                 if (ndo->ndo_packettype == PT_CARP) {
 484                         if (ndo->ndo_vflag)
 485                                 ND_PRINT("carp %s > %s: ",
 486                                              ipaddr_string(ndo, ipds->ip->ip_src),
 487                                              ipaddr_string(ndo, ipds->ip->ip_dst));
 488                         carp_print(ndo, ipds->cp, ipds->len,
 489                                 EXTRACT_U_1(ipds->ip->ip_ttl));
 490                 } else {
 491                         if (ndo->ndo_vflag)
 492                                 ND_PRINT("vrrp %s > %s: ",
 493                                              ipaddr_string(ndo, ipds->ip->ip_src),
 494                                              ipaddr_string(ndo, ipds->ip->ip_dst));
 495                         vrrp_print(ndo, ipds->cp, ipds->len,
 496                                 (const u_char *)ipds->ip,
 497                                 EXTRACT_U_1(ipds->ip->ip_ttl));
 498                 }
 499                 break;
 500
 501         case IPPROTO_PGM:
 502                 pgm_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
 503                 break;
 504
 505         default:
 506                 if (ndo->ndo_nflag==0 && (p_name = netdb_protoname(ipds->nh)) != NULL)
 507                         ND_PRINT(" %s", p_name);
 508                 else
 509                         ND_PRINT(" ip-proto-%u", ipds->nh);
 510                 ND_PRINT(" %u", ipds->len);
 511                 break;
 512         }
 513 }
 514
 515 void
 516 ip_inner_print(netdissect_options *ndo,
 517                const u_char *bp,
 518                u_int length, u_int nh,
 519                const u_char *bp2)
 520 {
 521         struct ip_print_demux_state  ipd;
 522
 523         ipd.ip = (const struct ip *)bp2;
 524         ipd.cp = bp;
 525         ipd.len  = length;
 526         ipd.off  = 0;
 527         ipd.nh   = nh;
 528         ipd.advance = 0;
 529
 530         ip_print_demux(ndo, &ipd);
 531 }
 532
 533
 534 /*
 535  * print an IP datagram.
 536  */
 537 void
 538 ip_print(netdissect_options *ndo,
 539          const u_char *bp,
 540          u_int length)
 541 {
 542         struct ip_print_demux_state  ipd;
 543         struct ip_print_demux_state *ipds=&ipd;
 544         const u_char *ipend;
 545         u_int hlen;
 546         struct cksum_vec vec[1];
 547         uint8_t ip_tos, ip_ttl, ip_proto;
 548         uint16_t sum, ip_sum;
 549         const char *p_name;
 550
 551         ndo->ndo_protocol = "ip";
 552         ipds->ip = (const struct ip *)bp;
 553         ND_TCHECK_1(ipds->ip->ip_vhl);
 554         if (IP_V(ipds->ip) != 4) { /* print version and fail if != 4 */
 555             if (IP_V(ipds->ip) == 6)
 556               ND_PRINT("IP6, wrong link-layer encapsulation");
 557             else
 558               ND_PRINT("IP%u", IP_V(ipds->ip));
 559             return;
 560         }
 561         if (!ndo->ndo_eflag)
 562                 ND_PRINT("IP ");
 563
 564         ND_TCHECK_SIZE(ipds->ip);
 565         if (length < sizeof (struct ip)) {
 566                 ND_PRINT("truncated-ip %u", length);
 567                 return;
 568         }
 569         hlen = IP_HL(ipds->ip) * 4;
 570         if (hlen < sizeof (struct ip)) {
 571                 ND_PRINT("bad-hlen %u", hlen);
 572                 return;
 573         }
 574
 575         ipds->len = EXTRACT_BE_U_2(ipds->ip->ip_len);
 576         if (length < ipds->len)
 577                 ND_PRINT("truncated-ip - %u bytes missing! ",
 578                         ipds->len - length);
 579         if (ipds->len < hlen) {
 580 #ifdef GUESS_TSO
 581             if (ipds->len) {
 582                 ND_PRINT("bad-len %u", ipds->len);
 583                 return;
 584             }
 585             else {
 586                 /* we guess that it is a TSO send */
 587                 ipds->len = length;
 588             }
 589 #else
 590             ND_PRINT("bad-len %u", ipds->len);
 591             return;
 592 #endif /* GUESS_TSO */
 593         }
 594
 595         /*
 596          * Cut off the snapshot length to the end of the IP payload.
 597          */
 598         ipend = bp + ipds->len;
 599         if (ipend < ndo->ndo_snapend)
 600                 ndo->ndo_snapend = ipend;
 601
 602         ipds->len -= hlen;
 603
 604         ipds->off = EXTRACT_BE_U_2(ipds->ip->ip_off);
 605
 606         ip_proto = EXTRACT_U_1(ipds->ip->ip_p);
 607
 608         if (ndo->ndo_vflag) {
 609             ip_tos = EXTRACT_U_1(ipds->ip->ip_tos);
 610             ND_PRINT("(tos 0x%x", ip_tos);
 611             /* ECN bits */
 612             switch (ip_tos & 0x03) {
 613
 614             case 0:
 615                 break;
 616
 617             case 1:
 618                 ND_PRINT(",ECT(1)");
 619                 break;
 620
 621             case 2:
 622                 ND_PRINT(",ECT(0)");
 623                 break;
 624
 625             case 3:
 626                 ND_PRINT(",CE");
 627                 break;
 628             }
 629
 630             ip_ttl = EXTRACT_U_1(ipds->ip->ip_ttl);
 631             if (ip_ttl >= 1)
 632                 ND_PRINT(", ttl %u", ip_ttl);
 633
 634             /*
 635              * for the firewall guys, print id, offset.
 636              * On all but the last stick a "+" in the flags portion.
 637              * For unfragmented datagrams, note the don't fragment flag.
 638              */
 639             ND_PRINT(", id %u, offset %u, flags [%s], proto %s (%u)",
 640                          EXTRACT_BE_U_2(ipds->ip->ip_id),
 641                          (ipds->off & 0x1fff) * 8,
 642                          bittok2str(ip_frag_values, "none", ipds->off&0xe000),
 643                          tok2str(ipproto_values, "unknown", ip_proto),
 644                          ip_proto);
 645
 646             ND_PRINT(", length %u", EXTRACT_BE_U_2(ipds->ip->ip_len));
 647
 648             if ((hlen - sizeof(struct ip)) > 0) {
 649                 ND_PRINT(", options (");
 650                 ip_optprint(ndo, (const u_char *)(ipds->ip + 1), hlen - sizeof(struct ip));
 651                 ND_PRINT(")");
 652             }
 653
 654             if (!ndo->ndo_Kflag && (const u_char *)ipds->ip + hlen <= ndo->ndo_snapend) {
 655                 vec[0].ptr = (const uint8_t *)(const void *)ipds->ip;
 656                 vec[0].len = hlen;
 657                 sum = in_cksum(vec, 1);
 658                 if (sum != 0) {
 659                     ip_sum = EXTRACT_BE_U_2(ipds->ip->ip_sum);
 660                     ND_PRINT(", bad cksum %x (->%x)!", ip_sum,
 661                              in_cksum_shouldbe(ip_sum, sum));
 662                 }
 663             }
 664
 665             ND_PRINT(")\n    ");
 666         }
 667
 668         /*
 669          * If this is fragment zero, hand it to the next higher
 670          * level protocol.
 671          */
 672         if ((ipds->off & 0x1fff) == 0) {
 673                 ipds->cp = (const u_char *)ipds->ip + hlen;
 674                 ipds->nh = EXTRACT_U_1(ipds->ip->ip_p);
 675
 676                 if (ipds->nh != IPPROTO_TCP && ipds->nh != IPPROTO_UDP &&
 677                     ipds->nh != IPPROTO_SCTP && ipds->nh != IPPROTO_DCCP) {
 678                         ND_PRINT("%s > %s: ",
 679                                      ipaddr_string(ndo, ipds->ip->ip_src),
 680                                      ipaddr_string(ndo, ipds->ip->ip_dst));
 681                 }
 682                 ip_print_demux(ndo, ipds);
 683         } else {
 684                 /*
 685                  * Ultra quiet now means that all this stuff should be
 686                  * suppressed.
 687                  */
 688                 if (ndo->ndo_qflag > 1)
 689                         return;
 690
 691                 /*
 692                  * This isn't the first frag, so we're missing the
 693                  * next level protocol header.  print the ip addr
 694                  * and the protocol.
 695                  */
 696                 ND_PRINT("%s > %s:", ipaddr_string(ndo, ipds->ip->ip_src),
 697                           ipaddr_string(ndo, ipds->ip->ip_dst));
 698                 if (!ndo->ndo_nflag && (p_name = netdb_protoname(ip_proto)) != NULL)
 699                         ND_PRINT(" %s", p_name);
 700                 else
 701                         ND_PRINT(" ip-proto-%u", ip_proto);
 702         }
 703         return;
 704
 705 trunc:
 706         nd_print_trunc(ndo);
 707         return;
 708 }
 709
 710 void
 711 ipN_print(netdissect_options *ndo, const u_char *bp, u_int length)
 712 {
 713         ndo->ndo_protocol = "ipN";
 714         if (length < 1) {
 715                 ND_PRINT("truncated-ip %u", length);
 716                 return;
 717         }
 718
 719         ND_TCHECK_1(bp);
 720         switch (EXTRACT_U_1(bp) & 0xF0) {
 721         case 0x40:
 722                 ip_print(ndo, bp, length);
 723                 break;
 724         case 0x60:
 725                 ip6_print(ndo, bp, length);
 726                 break;
 727         default:
 728                 ND_PRINT("unknown ip %u", (EXTRACT_U_1(bp) & 0xF0) >> 4);
 729                 break;
 730         }
 731         return;
 732
 733 trunc:
 734         nd_print_trunc(ndo);
 735         return;
 736 }