external/bsd/tcpdump/dist/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 #include <sys/cdefs.h>
  23 #ifndef lint
  24 __RCSID("$NetBSD: print-ip.c,v 1.8 2015/03/31 21:59:35 christos Exp $");
  25 #endif
  26
  27 #define NETDISSECT_REWORKED
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include <tcpdump-stdinc.h>
  33
  34 #include <string.h>
  35
  36 #include "interface.h"
  37 #include "addrtoname.h"
  38 #include "extract.h"                    /* must come after interface.h */
  39
  40 #include "ip.h"
  41 #include "ipproto.h"
  42
  43 static const char tstr[] = "[|ip]";
  44
  45 static const struct tok ip_option_values[] = {
  46     { IPOPT_EOL, "EOL" },
  47     { IPOPT_NOP, "NOP" },
  48     { IPOPT_TS, "timestamp" },
  49     { IPOPT_SECURITY, "security" },
  50     { IPOPT_RR, "RR" },
  51     { IPOPT_SSRR, "SSRR" },
  52     { IPOPT_LSRR, "LSRR" },
  53     { IPOPT_RA, "RA" },
  54     { IPOPT_RFC1393, "traceroute" },
  55     { 0, NULL }
  56 };
  57
  58 /*
  59  * print the recorded route in an IP RR, LSRR or SSRR option.
  60  */
  61 static void
  62 ip_printroute(netdissect_options *ndo,
  63               register const u_char *cp, u_int length)
  64 {
  65         register u_int ptr;
  66         register u_int len;
  67
  68         if (length < 3) {
  69                 ND_PRINT((ndo, " [bad length %u]", length));
  70                 return;
  71         }
  72         if ((length + 1) & 3)
  73                 ND_PRINT((ndo, " [bad length %u]", length));
  74         ptr = cp[2] - 1;
  75         if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
  76                 ND_PRINT((ndo, " [bad ptr %u]", cp[2]));
  77
  78         for (len = 3; len < length; len += 4) {
  79                 ND_PRINT((ndo, " %s", ipaddr_string(ndo, &cp[len])));
  80                 if (ptr > len)
  81                         ND_PRINT((ndo, ","));
  82         }
  83 }
  84
  85 /*
  86  * If source-routing is present and valid, return the final destination.
  87  * Otherwise, return IP destination.
  88  *
  89  * This is used for UDP and TCP pseudo-header in the checksum
  90  * calculation.
  91  */
  92 static uint32_t
  93 ip_finddst(netdissect_options *ndo,
  94            const struct ip *ip)
  95 {
  96         int length;
  97         int len;
  98         const u_char *cp;
  99         uint32_t retval;
 100
 101         cp = (const u_char *)(ip + 1);
 102         length = (IP_HL(ip) << 2) - sizeof(struct ip);
 103
 104         for (; length > 0; cp += len, length -= len) {
 105                 int tt;
 106
 107                 ND_TCHECK(*cp);
 108                 tt = *cp;
 109                 if (tt == IPOPT_EOL)
 110                         break;
 111                 else if (tt == IPOPT_NOP)
 112                         len = 1;
 113                 else {
 114                         ND_TCHECK(cp[1]);
 115                         len = cp[1];
 116                         if (len < 2)
 117                                 break;
 118                 }
 119                 ND_TCHECK2(*cp, len);
 120                 switch (tt) {
 121
 122                 case IPOPT_SSRR:
 123                 case IPOPT_LSRR:
 124                         if (len < 7)
 125                                 break;
 126                         UNALIGNED_MEMCPY(&retval, cp + len - 4, 4);
 127                         return retval;
 128                 }
 129         }
 130 trunc:
 131         UNALIGNED_MEMCPY(&retval, &ip->ip_dst.s_addr, sizeof(uint32_t));
 132         return retval;
 133 }
 134
 135 /*
 136  * Compute a V4-style checksum by building a pseudoheader.
 137  */
 138 int
 139 nextproto4_cksum(netdissect_options *ndo,
 140                  const struct ip *ip, const uint8_t *data,
 141                  u_int len, u_int covlen, u_int next_proto)
 142 {
 143         struct phdr {
 144                 uint32_t src;
 145                 uint32_t dst;
 146                 u_char mbz;
 147                 u_char proto;
 148                 uint16_t len;
 149         } ph;
 150         struct cksum_vec vec[2];
 151
 152         /* pseudo-header.. */
 153         ph.len = htons((uint16_t)len);
 154         ph.mbz = 0;
 155         ph.proto = next_proto;
 156         UNALIGNED_MEMCPY(&ph.src, &ip->ip_src.s_addr, sizeof(uint32_t));
 157         if (IP_HL(ip) == 5)
 158                 UNALIGNED_MEMCPY(&ph.dst, &ip->ip_dst.s_addr, sizeof(uint32_t));
 159         else
 160                 ph.dst = ip_finddst(ndo, ip);
 161
 162         vec[0].ptr = (const uint8_t *)(void *)&ph;
 163         vec[0].len = sizeof(ph);
 164         vec[1].ptr = data;
 165         vec[1].len = covlen;
 166         return (in_cksum(vec, 2));
 167 }
 168
 169 static void
 170 ip_printts(netdissect_options *ndo,
 171            register const u_char *cp, u_int length)
 172 {
 173         register u_int ptr;
 174         register u_int len;
 175         int hoplen;
 176         const char *type;
 177
 178         if (length < 4) {
 179                 ND_PRINT((ndo, "[bad length %u]", length));
 180                 return;
 181         }
 182         ND_PRINT((ndo, " TS{"));
 183         hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
 184         if ((length - 4) & (hoplen-1))
 185                 ND_PRINT((ndo, "[bad length %u]", length));
 186         ptr = cp[2] - 1;
 187         len = 0;
 188         if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
 189                 ND_PRINT((ndo, "[bad ptr %u]", cp[2]));
 190         switch (cp[3]&0xF) {
 191         case IPOPT_TS_TSONLY:
 192                 ND_PRINT((ndo, "TSONLY"));
 193                 break;
 194         case IPOPT_TS_TSANDADDR:
 195                 ND_PRINT((ndo, "TS+ADDR"));
 196                 break;
 197         /*
 198          * prespecified should really be 3, but some ones might send 2
 199          * instead, and the IPOPT_TS_PRESPEC constant can apparently
 200          * have both values, so we have to hard-code it here.
 201          */
 202
 203         case 2:
 204                 ND_PRINT((ndo, "PRESPEC2.0"));
 205                 break;
 206         case 3:                 /* IPOPT_TS_PRESPEC */
 207                 ND_PRINT((ndo, "PRESPEC"));
 208                 break;
 209         default:
 210                 ND_PRINT((ndo, "[bad ts type %d]", cp[3]&0xF));
 211                 goto done;
 212         }
 213
 214         type = " ";
 215         for (len = 4; len < length; len += hoplen) {
 216                 if (ptr == len)
 217                         type = " ^ ";
 218                 ND_PRINT((ndo, "%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
 219                        hoplen!=8 ? "" : ipaddr_string(ndo, &cp[len])));
 220                 type = " ";
 221         }
 222
 223 done:
 224         ND_PRINT((ndo, "%s", ptr == len ? " ^ " : ""));
 225
 226         if (cp[3]>>4)
 227                 ND_PRINT((ndo, " [%d hops not recorded]} ", cp[3]>>4));
 228         else
 229                 ND_PRINT((ndo, "}"));
 230 }
 231
 232 /*
 233  * print IP options.
 234  */
 235 static void
 236 ip_optprint(netdissect_options *ndo,
 237             register const u_char *cp, u_int length)
 238 {
 239         register u_int option_len;
 240         const char *sep = "";
 241
 242         for (; length > 0; cp += option_len, length -= option_len) {
 243                 u_int option_code;
 244
 245                 ND_PRINT((ndo, "%s", sep));
 246                 sep = ",";
 247
 248                 ND_TCHECK(*cp);
 249                 option_code = *cp;
 250
 251                 ND_PRINT((ndo, "%s",
 252                           tok2str(ip_option_values,"unknown %u",option_code)));
 253
 254                 if (option_code == IPOPT_NOP ||
 255                     option_code == IPOPT_EOL)
 256                         option_len = 1;
 257
 258                 else {
 259                         ND_TCHECK(cp[1]);
 260                         option_len = cp[1];
 261                         if (option_len < 2) {
 262                                 ND_PRINT((ndo, " [bad length %u]", option_len));
 263                                 return;
 264                         }
 265                 }
 266
 267                 if (option_len > length) {
 268                         ND_PRINT((ndo, " [bad length %u]", option_len));
 269                         return;
 270                 }
 271
 272                 ND_TCHECK2(*cp, option_len);
 273
 274                 switch (option_code) {
 275                 case IPOPT_EOL:
 276                         return;
 277
 278                 case IPOPT_TS:
 279                         ip_printts(ndo, cp, option_len);
 280                         break;
 281
 282                 case IPOPT_RR:       /* fall through */
 283                 case IPOPT_SSRR:
 284                 case IPOPT_LSRR:
 285                         ip_printroute(ndo, cp, option_len);
 286                         break;
 287
 288                 case IPOPT_RA:
 289                         if (option_len < 4) {
 290                                 ND_PRINT((ndo, " [bad length %u]", option_len));
 291                                 break;
 292                         }
 293                         ND_TCHECK(cp[3]);
 294                         if (EXTRACT_16BITS(&cp[2]) != 0)
 295                                 ND_PRINT((ndo, " value %u", EXTRACT_16BITS(&cp[2])));
 296                         break;
 297
 298                 case IPOPT_NOP:       /* nothing to print - fall through */
 299                 case IPOPT_SECURITY:
 300                 default:
 301                         break;
 302                 }
 303         }
 304         return;
 305
 306 trunc:
 307         ND_PRINT((ndo, "%s", tstr));
 308 }
 309
 310 #define IP_RES 0x8000
 311
 312 static const struct tok ip_frag_values[] = {
 313         { IP_MF,        "+" },
 314         { IP_DF,        "DF" },
 315         { IP_RES,       "rsvd" }, /* The RFC3514 evil ;-) bit */
 316         { 0,            NULL }
 317 };
 318
 319 struct ip_print_demux_state {
 320         const struct ip *ip;
 321         const u_char *cp;
 322         u_int   len, off;
 323         u_char  nh;
 324         int     advance;
 325 };
 326
 327 static void
 328 ip_print_demux(netdissect_options *ndo,
 329                struct ip_print_demux_state *ipds)
 330 {
 331         struct protoent *proto;
 332         struct cksum_vec vec[1];
 333
 334 again:
 335         switch (ipds->nh) {
 336
 337         case IPPROTO_AH:
 338                 ipds->nh = *ipds->cp;
 339                 ipds->advance = ah_print(ndo, ipds->cp);
 340                 if (ipds->advance <= 0)
 341                         break;
 342                 ipds->cp += ipds->advance;
 343                 ipds->len -= ipds->advance;
 344                 goto again;
 345
 346         case IPPROTO_ESP:
 347         {
 348                 int enh, padlen;
 349                 ipds->advance = esp_print(ndo, ipds->cp, ipds->len,
 350                                     (const u_char *)ipds->ip,
 351                                     &enh, &padlen);
 352                 if (ipds->advance <= 0)
 353                         break;
 354                 ipds->cp += ipds->advance;
 355                 ipds->len -= ipds->advance + padlen;
 356                 ipds->nh = enh & 0xff;
 357                 goto again;
 358         }
 359
 360         case IPPROTO_IPCOMP:
 361         {
 362                 int enh;
 363                 ipds->advance = ipcomp_print(ndo, ipds->cp, &enh);
 364                 if (ipds->advance <= 0)
 365                         break;
 366                 ipds->cp += ipds->advance;
 367                 ipds->len -= ipds->advance;
 368                 ipds->nh = enh & 0xff;
 369                 goto again;
 370         }
 371
 372         case IPPROTO_SCTP:
 373                 sctp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len);
 374                 break;
 375
 376         case IPPROTO_DCCP:
 377                 dccp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len);
 378                 break;
 379
 380         case IPPROTO_TCP:
 381                 /* pass on the MF bit plus the offset to detect fragments */
 382                 tcp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
 383                           ipds->off & (IP_MF|IP_OFFMASK));
 384                 break;
 385
 386         case IPPROTO_UDP:
 387                 /* pass on the MF bit plus the offset to detect fragments */
 388                 udp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
 389                           ipds->off & (IP_MF|IP_OFFMASK));
 390                 break;
 391
 392         case IPPROTO_ICMP:
 393                 /* pass on the MF bit plus the offset to detect fragments */
 394                 icmp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
 395                            ipds->off & (IP_MF|IP_OFFMASK));
 396                 break;
 397
 398         case IPPROTO_PIGP:
 399                 /*
 400                  * XXX - the current IANA protocol number assignments
 401                  * page lists 9 as "any private interior gateway
 402                  * (used by Cisco for their IGRP)" and 88 as
 403                  * "EIGRP" from Cisco.
 404                  *
 405                  * Recent BSD <netinet/in.h> headers define
 406                  * IP_PROTO_PIGP as 9 and IP_PROTO_IGRP as 88.
 407                  * We define IP_PROTO_PIGP as 9 and
 408                  * IP_PROTO_EIGRP as 88; those names better
 409                  * match was the current protocol number
 410                  * assignments say.
 411                  */
 412                 igrp_print(ndo, ipds->cp, ipds->len);
 413                 break;
 414
 415         case IPPROTO_EIGRP:
 416                 eigrp_print(ndo, ipds->cp, ipds->len);
 417                 break;
 418
 419         case IPPROTO_ND:
 420                 ND_PRINT((ndo, " nd %d", ipds->len));
 421                 break;
 422
 423         case IPPROTO_EGP:
 424                 egp_print(ndo, ipds->cp, ipds->len);
 425                 break;
 426
 427         case IPPROTO_OSPF:
 428                 ospf_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
 429                 break;
 430
 431         case IPPROTO_IGMP:
 432                 igmp_print(ndo, ipds->cp, ipds->len);
 433                 break;
 434
 435         case IPPROTO_IPV4:
 436                 /* DVMRP multicast tunnel (ip-in-ip encapsulation) */
 437                 ip_print(ndo, ipds->cp, ipds->len);
 438                 if (! ndo->ndo_vflag) {
 439                         ND_PRINT((ndo, " (ipip-proto-4)"));
 440                         return;
 441                 }
 442                 break;
 443
 444         case IPPROTO_IPV6:
 445                 /* ip6-in-ip encapsulation */
 446                 ip6_print(ndo, ipds->cp, ipds->len);
 447                 break;
 448
 449         case IPPROTO_RSVP:
 450                 rsvp_print(ndo, ipds->cp, ipds->len);
 451                 break;
 452
 453         case IPPROTO_GRE:
 454                 /* do it */
 455                 gre_print(ndo, ipds->cp, ipds->len);
 456                 break;
 457
 458         case IPPROTO_MOBILE:
 459                 mobile_print(ndo, ipds->cp, ipds->len);
 460                 break;
 461
 462         case IPPROTO_PIM:
 463                 vec[0].ptr = ipds->cp;
 464                 vec[0].len = ipds->len;
 465                 pim_print(ndo, ipds->cp, ipds->len, in_cksum(vec, 1));
 466                 break;
 467
 468         case IPPROTO_VRRP:
 469                 if (ndo->ndo_packettype == PT_CARP) {
 470                         if (ndo->ndo_vflag)
 471                                 ND_PRINT((ndo, "carp %s > %s: ",
 472                                              ipaddr_string(ndo, &ipds->ip->ip_src),
 473                                              ipaddr_string(ndo, &ipds->ip->ip_dst)));
 474                         carp_print(ndo, ipds->cp, ipds->len, ipds->ip->ip_ttl);
 475                 } else {
 476                         if (ndo->ndo_vflag)
 477                                 ND_PRINT((ndo, "vrrp %s > %s: ",
 478                                              ipaddr_string(ndo, &ipds->ip->ip_src),
 479                                              ipaddr_string(ndo, &ipds->ip->ip_dst)));
 480                         vrrp_print(ndo, ipds->cp, ipds->len,
 481                                 (const u_char *)ipds->ip, ipds->ip->ip_ttl);
 482                 }
 483                 break;
 484
 485         case IPPROTO_PGM:
 486                 pgm_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
 487                 break;
 488
 489         case IPPROTO_PFSYNC:
 490                 pfsync_ip_print(ipds->cp, ipds->len, (const u_char *)ipds->ip);
 491                 break;
 492
 493         default:
 494                 if (ndo->ndo_nflag==0 && (proto = getprotobynumber(ipds->nh)) != NULL)
 495                         ND_PRINT((ndo, " %s", proto->p_name));
 496                 else
 497                         ND_PRINT((ndo, " ip-proto-%d", ipds->nh));
 498                 ND_PRINT((ndo, " %d", ipds->len));
 499                 break;
 500         }
 501 }
 502
 503 void
 504 ip_print_inner(netdissect_options *ndo,
 505                const u_char *bp,
 506                u_int length, u_int nh,
 507                const u_char *bp2)
 508 {
 509         struct ip_print_demux_state  ipd;
 510
 511         ipd.ip = (const struct ip *)bp2;
 512         ipd.cp = bp;
 513         ipd.len  = length;
 514         ipd.off  = 0;
 515         ipd.nh   = nh;
 516         ipd.advance = 0;
 517
 518         ip_print_demux(ndo, &ipd);
 519 }
 520
 521
 522 /*
 523  * print an IP datagram.
 524  */
 525 void
 526 ip_print(netdissect_options *ndo,
 527          const u_char *bp,
 528          u_int length)
 529 {
 530         struct ip_print_demux_state  ipd;
 531         struct ip_print_demux_state *ipds=&ipd;
 532         const u_char *ipend;
 533         u_int hlen;
 534         struct cksum_vec vec[1];
 535         uint16_t sum, ip_sum;
 536         struct protoent *proto;
 537
 538         ipds->ip = (const struct ip *)bp;
 539         ND_TCHECK(ipds->ip->ip_vhl);
 540         if (IP_V(ipds->ip) != 4) { /* print version if != 4 */
 541             if (IP_V(ipds->ip) == 6)
 542               ND_PRINT((ndo, "IP6, wrong link-layer encapsulation "));
 543             else
 544               ND_PRINT((ndo, "IP%u ", IP_V(ipds->ip)));
 545         }
 546         else if (!ndo->ndo_eflag)
 547                 ND_PRINT((ndo, "IP "));
 548
 549         ND_TCHECK(*ipds->ip);
 550         if (length < sizeof (struct ip)) {
 551                 ND_PRINT((ndo, "truncated-ip %u", length));
 552                 return;
 553         }
 554         hlen = IP_HL(ipds->ip) * 4;
 555         if (hlen < sizeof (struct ip)) {
 556                 ND_PRINT((ndo, "bad-hlen %u", hlen));
 557                 return;
 558         }
 559
 560         ipds->len = EXTRACT_16BITS(&ipds->ip->ip_len);
 561         if (length < ipds->len)
 562                 ND_PRINT((ndo, "truncated-ip - %u bytes missing! ",
 563                         ipds->len - length));
 564         if (ipds->len < hlen) {
 565 #ifdef GUESS_TSO
 566             if (ipds->len) {
 567                 ND_PRINT((ndo, "bad-len %u", ipds->len));
 568                 return;
 569             }
 570             else {
 571                 /* we guess that it is a TSO send */
 572                 ipds->len = length;
 573             }
 574 #else
 575             ND_PRINT((ndo, "bad-len %u", ipds->len));
 576             return;
 577 #endif /* GUESS_TSO */
 578         }
 579
 580         /*
 581          * Cut off the snapshot length to the end of the IP payload.
 582          */
 583         ipend = bp + ipds->len;
 584         if (ipend < ndo->ndo_snapend)
 585                 ndo->ndo_snapend = ipend;
 586
 587         ipds->len -= hlen;
 588
 589         ipds->off = EXTRACT_16BITS(&ipds->ip->ip_off);
 590
 591         if (ndo->ndo_vflag) {
 592             ND_PRINT((ndo, "(tos 0x%x", (int)ipds->ip->ip_tos));
 593             /* ECN bits */
 594             if (ipds->ip->ip_tos & 0x03) {
 595                 switch (ipds->ip->ip_tos & 0x03) {
 596                 case 1:
 597                     ND_PRINT((ndo, ",ECT(1)"));
 598                     break;
 599                 case 2:
 600                     ND_PRINT((ndo, ",ECT(0)"));
 601                     break;
 602                 case 3:
 603                     ND_PRINT((ndo, ",CE"));
 604                 }
 605             }
 606
 607             if (ipds->ip->ip_ttl >= 1)
 608                 ND_PRINT((ndo, ", ttl %u", ipds->ip->ip_ttl));
 609
 610             /*
 611              * for the firewall guys, print id, offset.
 612              * On all but the last stick a "+" in the flags portion.
 613              * For unfragmented datagrams, note the don't fragment flag.
 614              */
 615
 616             ND_PRINT((ndo, ", id %u, offset %u, flags [%s], proto %s (%u)",
 617                          EXTRACT_16BITS(&ipds->ip->ip_id),
 618                          (ipds->off & 0x1fff) * 8,
 619                          bittok2str(ip_frag_values, "none", ipds->off&0xe000),
 620                          tok2str(ipproto_values,"unknown",ipds->ip->ip_p),
 621                          ipds->ip->ip_p));
 622
 623             ND_PRINT((ndo, ", length %u", EXTRACT_16BITS(&ipds->ip->ip_len)));
 624
 625             if ((hlen - sizeof(struct ip)) > 0) {
 626                 ND_PRINT((ndo, ", options ("));
 627                 ip_optprint(ndo, (u_char *)(ipds->ip + 1), hlen - sizeof(struct ip));
 628                 ND_PRINT((ndo, ")"));
 629             }
 630
 631             if (!ndo->ndo_Kflag && (u_char *)ipds->ip + hlen <= ndo->ndo_snapend) {
 632                 vec[0].ptr = (const uint8_t *)(void *)ipds->ip;
 633                 vec[0].len = hlen;
 634                 sum = in_cksum(vec, 1);
 635                 if (sum != 0) {
 636                     ip_sum = EXTRACT_16BITS(&ipds->ip->ip_sum);
 637                     ND_PRINT((ndo, ", bad cksum %x (->%x)!", ip_sum,
 638                              in_cksum_shouldbe(ip_sum, sum)));
 639                 }
 640             }
 641
 642                 ND_PRINT((ndo, ")\n    "));
 643         }
 644
 645         /*
 646          * If this is fragment zero, hand it to the next higher
 647          * level protocol.
 648          */
 649         if ((ipds->off & 0x1fff) == 0) {
 650                 ipds->cp = (const u_char *)ipds->ip + hlen;
 651                 ipds->nh = ipds->ip->ip_p;
 652
 653                 if (ipds->nh != IPPROTO_TCP && ipds->nh != IPPROTO_UDP &&
 654                     ipds->nh != IPPROTO_SCTP && ipds->nh != IPPROTO_DCCP) {
 655                         ND_PRINT((ndo, "%s > %s: ",
 656                                      ipaddr_string(ndo, &ipds->ip->ip_src),
 657                                      ipaddr_string(ndo, &ipds->ip->ip_dst)));
 658                 }
 659                 ip_print_demux(ndo, ipds);
 660         } else {
 661             /* Ultra quiet now means that all this stuff should be suppressed */
 662             if (ndo->ndo_qflag > 1) return;
 663
 664             /*
 665              * if this isn't the first frag, we're missing the
 666              * next level protocol header.  print the ip addr
 667              * and the protocol.
 668              */
 669                 if (ipds->off & 0x1fff) {
 670                         ND_PRINT((ndo, "%s > %s:", ipaddr_string(ndo, &ipds->ip->ip_src),
 671                                   ipaddr_string(ndo, &ipds->ip->ip_dst)));
 672                         if (!ndo->ndo_nflag && (proto = getprotobynumber(ipds->ip->ip_p)) != NULL)
 673                                 ND_PRINT((ndo, " %s", proto->p_name));
 674                         else
 675                                 ND_PRINT((ndo, " ip-proto-%d", ipds->ip->ip_p));
 676                 }
 677         }
 678         return;
 679
 680 trunc:
 681         ND_PRINT((ndo, "%s", tstr));
 682         return;
 683 }
 684
 685 void
 686 ipN_print(netdissect_options *ndo, register const u_char *bp, register u_int length)
 687 {
 688         struct ip hdr;
 689
 690         if (length < 4) {
 691                 ND_PRINT((ndo, "truncated-ip %d", length));
 692                 return;
 693         }
 694         memcpy (&hdr, bp, 4);
 695         switch (IP_V(&hdr)) {
 696         case 4:
 697                 ip_print (ndo, bp, length);
 698                 return;
 699         case 6:
 700                 ip6_print (ndo, bp, length);
 701                 return;
 702         default:
 703                 ND_PRINT((ndo, "unknown ip %d", IP_V(&hdr)));
 704                 return;
 705         }
 706 }
 707
 708 /*
 709  * Local Variables:
 710  * c-style: whitesmith
 711  * c-basic-offset: 8
 712  * End:
 713  */
 714
 715