print-pim.c

   1 /*
   2  * Copyright (c) 1995, 1996
   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 #ifndef lint
  23 static const char rcsid[] _U_ =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-pim.c,v 1.49 2006-02-13 01:31:35 hannes Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <tcpdump-stdinc.h>
  32 #include "interface.h"
  33
  34 #define PIMV2_TYPE_HELLO         0
  35 #define PIMV2_TYPE_REGISTER      1
  36 #define PIMV2_TYPE_REGISTER_STOP 2
  37 #define PIMV2_TYPE_JOIN_PRUNE    3
  38 #define PIMV2_TYPE_BOOTSTRAP     4
  39 #define PIMV2_TYPE_ASSERT        5
  40 #define PIMV2_TYPE_GRAFT         6
  41 #define PIMV2_TYPE_GRAFT_ACK     7
  42 #define PIMV2_TYPE_CANDIDATE_RP  8
  43 #define PIMV2_TYPE_PRUNE_REFRESH 9
  44
  45 static struct tok pimv2_type_values[] = {
  46     { PIMV2_TYPE_HELLO,         "Hello" },
  47     { PIMV2_TYPE_REGISTER,      "Register" },
  48     { PIMV2_TYPE_REGISTER_STOP, "Register Stop" },
  49     { PIMV2_TYPE_JOIN_PRUNE,    "Join / Prune" },
  50     { PIMV2_TYPE_BOOTSTRAP,     "Bootstrap" },
  51     { PIMV2_TYPE_ASSERT,        "Assert" },
  52     { PIMV2_TYPE_GRAFT,         "Graft" },
  53     { PIMV2_TYPE_GRAFT_ACK,     "Graft Acknowledgement" },
  54     { PIMV2_TYPE_CANDIDATE_RP,  "Candidate RP Advertisement" },
  55     { PIMV2_TYPE_PRUNE_REFRESH, "Prune Refresh" },
  56     { 0, NULL}
  57 };
  58
  59 #define PIMV2_HELLO_OPTION_HOLDTIME             1
  60 #define PIMV2_HELLO_OPTION_LANPRUNEDELAY        2
  61 #define PIMV2_HELLO_OPTION_DR_PRIORITY_OLD     18
  62 #define PIMV2_HELLO_OPTION_DR_PRIORITY         19
  63 #define PIMV2_HELLO_OPTION_GENID               20
  64 #define PIMV2_HELLO_OPTION_REFRESH_CAP         21
  65 #define PIMV2_HELLO_OPTION_BIDIR_CAP           22
  66 #define PIMV2_HELLO_OPTION_ADDRESS_LIST        24
  67 #define PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD 65001
  68
  69 static struct tok pimv2_hello_option_values[] = {
  70     { PIMV2_HELLO_OPTION_HOLDTIME,         "Hold Time" },
  71     { PIMV2_HELLO_OPTION_LANPRUNEDELAY,    "LAN Prune Delay" },
  72     { PIMV2_HELLO_OPTION_DR_PRIORITY_OLD,  "DR Priority (Old)" },
  73     { PIMV2_HELLO_OPTION_DR_PRIORITY,      "DR Priority" },
  74     { PIMV2_HELLO_OPTION_GENID,            "Generation ID" },
  75     { PIMV2_HELLO_OPTION_REFRESH_CAP,      "State Refresh Capability" },
  76     { PIMV2_HELLO_OPTION_BIDIR_CAP,        "Bi-Directional Capability" },
  77     { PIMV2_HELLO_OPTION_ADDRESS_LIST,     "Address List" },
  78     { PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD, "Address List (Old)" },
  79     { 0, NULL}
  80 };
  81
  82 #define PIMV2_REGISTER_FLAG_LEN      4
  83 #define PIMV2_REGISTER_FLAG_BORDER 0x80000000
  84 #define PIMV2_REGISTER_FLAG_NULL   0x40000000
  85
  86 static struct tok pimv2_register_flag_values[] = {
  87     { PIMV2_REGISTER_FLAG_BORDER, "Border" },
  88     { PIMV2_REGISTER_FLAG_NULL, "Null" },
  89     { 0, NULL}
  90 };
  91
  92 /*
  93  * XXX: We consider a case where IPv6 is not ready yet for portability,
  94  * but PIM dependent defintions should be independent of IPv6...
  95  */
  96
  97 struct pim {
  98         u_int8_t pim_typever;
  99                         /* upper 4bit: PIM version number; 2 for PIMv2 */
 100                         /* lower 4bit: the PIM message type, currently they are:
 101                          * Hello, Register, Register-Stop, Join/Prune,
 102                          * Bootstrap, Assert, Graft (PIM-DM only),
 103                          * Graft-Ack (PIM-DM only), C-RP-Adv
 104                          */
 105 #define PIM_VER(x)      (((x) & 0xf0) >> 4)
 106 #define PIM_TYPE(x)     ((x) & 0x0f)
 107         u_char  pim_rsv;        /* Reserved */
 108         u_short pim_cksum;      /* IP style check sum */
 109 };
 110
 111
 112 #include <stdio.h>
 113 #include <stdlib.h>
 114
 115 #include "interface.h"
 116 #include "addrtoname.h"
 117 #include "extract.h"
 118
 119 #include "ip.h"
 120
 121 static void pimv2_print(register const u_char *bp, register u_int len, u_int cksum);
 122
 123 static void
 124 pimv1_join_prune_print(register const u_char *bp, register u_int len)
 125 {
 126         int maddrlen, addrlen, ngroups, njoin, nprune;
 127         int njp;
 128
 129         /* If it's a single group and a single source, use 1-line output. */
 130         if (TTEST2(bp[0], 30) && bp[11] == 1 &&
 131             ((njoin = EXTRACT_16BITS(&bp[20])) + EXTRACT_16BITS(&bp[22])) == 1) {
 132                 int hold;
 133
 134                 (void)printf(" RPF %s ", ipaddr_string(bp));
 135                 hold = EXTRACT_16BITS(&bp[6]);
 136                 if (hold != 180) {
 137                         (void)printf("Hold ");
 138                         relts_print(hold);
 139                 }
 140                 (void)printf("%s (%s/%d, %s", njoin ? "Join" : "Prune",
 141                 ipaddr_string(&bp[26]), bp[25] & 0x3f,
 142                 ipaddr_string(&bp[12]));
 143                 if (EXTRACT_32BITS(&bp[16]) != 0xffffffff)
 144                         (void)printf("/%s", ipaddr_string(&bp[16]));
 145                 (void)printf(") %s%s %s",
 146                     (bp[24] & 0x01) ? "Sparse" : "Dense",
 147                     (bp[25] & 0x80) ? " WC" : "",
 148                     (bp[25] & 0x40) ? "RP" : "SPT");
 149                 return;
 150         }
 151
 152         TCHECK2(bp[0], sizeof(struct in_addr));
 153         if (vflag > 1)
 154                 (void)printf("\n");
 155         (void)printf(" Upstream Nbr: %s", ipaddr_string(bp));
 156         TCHECK2(bp[6], 2);
 157         if (vflag > 1)
 158                 (void)printf("\n");
 159         (void)printf(" Hold time: ");
 160         relts_print(EXTRACT_16BITS(&bp[6]));
 161         if (vflag < 2)
 162                 return;
 163         bp += 8;
 164         len -= 8;
 165
 166         TCHECK2(bp[0], 4);
 167         maddrlen = bp[1];
 168         addrlen = bp[2];
 169         ngroups = bp[3];
 170         bp += 4;
 171         len -= 4;
 172         while (ngroups--) {
 173                 /*
 174                  * XXX - does the address have length "addrlen" and the
 175                  * mask length "maddrlen"?
 176                  */
 177                 TCHECK2(bp[0], sizeof(struct in_addr));
 178                 (void)printf("\n\tGroup: %s", ipaddr_string(bp));
 179                 TCHECK2(bp[4], sizeof(struct in_addr));
 180                 if (EXTRACT_32BITS(&bp[4]) != 0xffffffff)
 181                         (void)printf("/%s", ipaddr_string(&bp[4]));
 182                 TCHECK2(bp[8], 4);
 183                 njoin = EXTRACT_16BITS(&bp[8]);
 184                 nprune = EXTRACT_16BITS(&bp[10]);
 185                 (void)printf(" joined: %d pruned: %d", njoin, nprune);
 186                 bp += 12;
 187                 len -= 12;
 188                 for (njp = 0; njp < (njoin + nprune); njp++) {
 189                         const char *type;
 190
 191                         if (njp < njoin)
 192                                 type = "Join ";
 193                         else
 194                                 type = "Prune";
 195                         TCHECK2(bp[0], 6);
 196                         (void)printf("\n\t%s %s%s%s%s/%d", type,
 197                             (bp[0] & 0x01) ? "Sparse " : "Dense ",
 198                             (bp[1] & 0x80) ? "WC " : "",
 199                             (bp[1] & 0x40) ? "RP " : "SPT ",
 200                         ipaddr_string(&bp[2]), bp[1] & 0x3f);
 201                         bp += 6;
 202                         len -= 6;
 203                 }
 204         }
 205         return;
 206 trunc:
 207         (void)printf("[|pim]");
 208         return;
 209 }
 210
 211 void
 212 pimv1_print(register const u_char *bp, register u_int len)
 213 {
 214         register const u_char *ep;
 215         register u_char type;
 216
 217         ep = (const u_char *)snapend;
 218         if (bp >= ep)
 219                 return;
 220
 221         TCHECK(bp[1]);
 222         type = bp[1];
 223
 224         switch (type) {
 225         case 0:
 226                 (void)printf(" Query");
 227                 if (TTEST(bp[8])) {
 228                         switch (bp[8] >> 4) {
 229                         case 0:
 230                                 (void)printf(" Dense-mode");
 231                                 break;
 232                         case 1:
 233                                 (void)printf(" Sparse-mode");
 234                                 break;
 235                         case 2:
 236                                 (void)printf(" Sparse-Dense-mode");
 237                                 break;
 238                         default:
 239                                 (void)printf(" mode-%d", bp[8] >> 4);
 240                                 break;
 241                         }
 242                 }
 243                 if (vflag) {
 244                         TCHECK2(bp[10],2);
 245                         (void)printf(" (Hold-time ");
 246                         relts_print(EXTRACT_16BITS(&bp[10]));
 247                         (void)printf(")");
 248                 }
 249                 break;
 250
 251         case 1:
 252                 (void)printf(" Register");
 253                 TCHECK2(bp[8], 20);                     /* ip header */
 254                 (void)printf(" for %s > %s", ipaddr_string(&bp[20]),
 255                     ipaddr_string(&bp[24]));
 256                 break;
 257         case 2:
 258                 (void)printf(" Register-Stop");
 259                 TCHECK2(bp[12], sizeof(struct in_addr));
 260                 (void)printf(" for %s > %s", ipaddr_string(&bp[8]),
 261                     ipaddr_string(&bp[12]));
 262                 break;
 263         case 3:
 264                 (void)printf(" Join/Prune");
 265                 if (vflag)
 266                         pimv1_join_prune_print(&bp[8], len - 8);
 267                 break;
 268         case 4:
 269                 (void)printf(" RP-reachable");
 270                 if (vflag) {
 271                         TCHECK2(bp[22], 2);
 272                         (void)printf(" group %s",
 273                         ipaddr_string(&bp[8]));
 274                         if (EXTRACT_32BITS(&bp[12]) != 0xffffffff)
 275                                 (void)printf("/%s", ipaddr_string(&bp[12]));
 276                         (void)printf(" RP %s hold ", ipaddr_string(&bp[16]));
 277                         relts_print(EXTRACT_16BITS(&bp[22]));
 278                 }
 279                 break;
 280         case 5:
 281                 (void)printf(" Assert");
 282                 TCHECK2(bp[16], sizeof(struct in_addr));
 283                 (void)printf(" for %s > %s", ipaddr_string(&bp[16]),
 284                     ipaddr_string(&bp[8]));
 285                 if (EXTRACT_32BITS(&bp[12]) != 0xffffffff)
 286                         (void)printf("/%s", ipaddr_string(&bp[12]));
 287                 TCHECK2(bp[24], 4);
 288                 (void)printf(" %s pref %d metric %d",
 289                     (bp[20] & 0x80) ? "RP-tree" : "SPT",
 290                 EXTRACT_32BITS(&bp[20]) & 0x7fffffff,
 291                 EXTRACT_32BITS(&bp[24]));
 292                 break;
 293         case 6:
 294                 (void)printf(" Graft");
 295                 if (vflag)
 296                         pimv1_join_prune_print(&bp[8], len - 8);
 297                 break;
 298         case 7:
 299                 (void)printf(" Graft-ACK");
 300                 if (vflag)
 301                         pimv1_join_prune_print(&bp[8], len - 8);
 302                 break;
 303         case 8:
 304                 (void)printf(" Mode");
 305                 break;
 306         default:
 307                 (void)printf(" [type %d]", type);
 308                 break;
 309         }
 310         if ((bp[4] >> 4) != 1)
 311                 (void)printf(" [v%d]", bp[4] >> 4);
 312         return;
 313
 314 trunc:
 315         (void)printf("[|pim]");
 316         return;
 317 }
 318
 319 /*
 320  * auto-RP is a cisco protocol, documented at
 321  * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
 322  *
 323  * This implements version 1+, dated Sept 9, 1998.
 324  */
 325 void
 326 cisco_autorp_print(register const u_char *bp, register u_int len)
 327 {
 328         int type;
 329         int numrps;
 330         int hold;
 331
 332         TCHECK(bp[0]);
 333         (void)printf(" auto-rp ");
 334         type = bp[0];
 335         switch (type) {
 336         case 0x11:
 337                 (void)printf("candidate-advert");
 338                 break;
 339         case 0x12:
 340                 (void)printf("mapping");
 341                 break;
 342         default:
 343                 (void)printf("type-0x%02x", type);
 344                 break;
 345         }
 346
 347         TCHECK(bp[1]);
 348         numrps = bp[1];
 349
 350         TCHECK2(bp[2], 2);
 351         (void)printf(" Hold ");
 352         hold = EXTRACT_16BITS(&bp[2]);
 353         if (hold)
 354                 relts_print(EXTRACT_16BITS(&bp[2]));
 355         else
 356                 printf("FOREVER");
 357
 358         /* Next 4 bytes are reserved. */
 359
 360         bp += 8; len -= 8;
 361
 362         /*XXX skip unless -v? */
 363
 364         /*
 365          * Rest of packet:
 366          * numrps entries of the form:
 367          * 32 bits: RP
 368          * 6 bits: reserved
 369          * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
 370          * 8 bits: # of entries for this RP
 371          * each entry: 7 bits: reserved, 1 bit: negative,
 372          *             8 bits: mask 32 bits: source
 373          * lather, rinse, repeat.
 374          */
 375         while (numrps--) {
 376                 int nentries;
 377                 char s;
 378
 379                 TCHECK2(bp[0], 4);
 380                 (void)printf(" RP %s", ipaddr_string(bp));
 381                 TCHECK(bp[4]);
 382                 switch (bp[4] & 0x3) {
 383                 case 0: printf(" PIMv?");
 384                         break;
 385                 case 1: printf(" PIMv1");
 386                         break;
 387                 case 2: printf(" PIMv2");
 388                         break;
 389                 case 3: printf(" PIMv1+2");
 390                         break;
 391                 }
 392                 if (bp[4] & 0xfc)
 393                         (void)printf(" [rsvd=0x%02x]", bp[4] & 0xfc);
 394                 TCHECK(bp[5]);
 395                 nentries = bp[5];
 396                 bp += 6; len -= 6;
 397                 s = ' ';
 398                 for (; nentries; nentries--) {
 399                         TCHECK2(bp[0], 6);
 400                         (void)printf("%c%s%s/%d", s, bp[0] & 1 ? "!" : "",
 401                             ipaddr_string(&bp[2]), bp[1]);
 402                         if (bp[0] & 0xfe)
 403                                 (void)printf("[rsvd=0x%02x]", bp[0] & 0xfe);
 404                         s = ',';
 405                         bp += 6; len -= 6;
 406                 }
 407         }
 408         return;
 409
 410 trunc:
 411         (void)printf("[|autorp]");
 412         return;
 413 }
 414
 415 void
 416 pim_print(register const u_char *bp, register u_int len, u_int cksum)
 417 {
 418         register const u_char *ep;
 419         register struct pim *pim = (struct pim *)bp;
 420
 421         ep = (const u_char *)snapend;
 422         if (bp >= ep)
 423                 return;
 424 #ifdef notyet                   /* currently we see only version and type */
 425         TCHECK(pim->pim_rsv);
 426 #endif
 427
 428         switch (PIM_VER(pim->pim_typever)) {
 429         case 2:
 430             if (!vflag) {
 431                 printf("PIMv%u, %s, length %u",
 432                        PIM_VER(pim->pim_typever),
 433                        tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim->pim_typever)),
 434                        len);
 435                 return;
 436             } else {
 437                 printf("PIMv%u, length %u\n\t%s",
 438                        PIM_VER(pim->pim_typever),
 439                        len,
 440                        tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim->pim_typever)));
 441                 pimv2_print(bp, len, cksum);
 442             }
 443             break;
 444         default:
 445                 printf("PIMv%u, length %u",
 446                        PIM_VER(pim->pim_typever),
 447                        len);
 448                 break;
 449         }
 450         return;
 451 }
 452
 453 /*
 454  * PIMv2 uses encoded address representations.
 455  *
 456  * The last PIM-SM I-D before RFC2117 was published specified the
 457  * following representation for unicast addresses.  However, RFC2117
 458  * specified no encoding for unicast addresses with the unicast
 459  * address length specified in the header.  Therefore, we have to
 460  * guess which encoding is being used (Cisco's PIMv2 implementation
 461  * uses the non-RFC encoding).  RFC2117 turns a previously "Reserved"
 462  * field into a 'unicast-address-length-in-bytes' field.  We guess
 463  * that it's the draft encoding if this reserved field is zero.
 464  *
 465  * RFC2362 goes back to the encoded format, and calls the addr length
 466  * field "reserved" again.
 467  *
 468  * The first byte is the address family, from:
 469  *
 470  *    0    Reserved
 471  *    1    IP (IP version 4)
 472  *    2    IP6 (IP version 6)
 473  *    3    NSAP
 474  *    4    HDLC (8-bit multidrop)
 475  *    5    BBN 1822
 476  *    6    802 (includes all 802 media plus Ethernet "canonical format")
 477  *    7    E.163
 478  *    8    E.164 (SMDS, Frame Relay, ATM)
 479  *    9    F.69 (Telex)
 480  *   10    X.121 (X.25, Frame Relay)
 481  *   11    IPX
 482  *   12    Appletalk
 483  *   13    Decnet IV
 484  *   14    Banyan Vines
 485  *   15    E.164 with NSAP format subaddress
 486  *
 487  * In addition, the second byte is an "Encoding".  0 is the default
 488  * encoding for the address family, and no other encodings are currently
 489  * specified.
 490  *
 491  */
 492
 493 static int pimv2_addr_len;
 494
 495 enum pimv2_addrtype {
 496         pimv2_unicast, pimv2_group, pimv2_source
 497 };
 498
 499 /*  0                   1                   2                   3
 500  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 501  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 502  * | Addr Family   | Encoding Type |     Unicast Address           |
 503  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
 504  *  0                   1                   2                   3
 505  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 506  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 507  * | Addr Family   | Encoding Type |   Reserved    |  Mask Len     |
 508  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 509  * |                Group multicast Address                        |
 510  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 511  *  0                   1                   2                   3
 512  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 513  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 514  * | Addr Family   | Encoding Type | Rsrvd   |S|W|R|  Mask Len     |
 515  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 516  * |                        Source Address                         |
 517  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 518  */
 519 static int
 520 pimv2_addr_print(const u_char *bp, enum pimv2_addrtype at, int silent)
 521 {
 522         int af;
 523         int len, hdrlen;
 524
 525         TCHECK(bp[0]);
 526
 527         if (pimv2_addr_len == 0) {
 528                 TCHECK(bp[1]);
 529                 switch (bp[0]) {
 530                 case 1:
 531                         af = AF_INET;
 532                         len = sizeof(struct in_addr);
 533                         break;
 534 #ifdef INET6
 535                 case 2:
 536                         af = AF_INET6;
 537                         len = sizeof(struct in6_addr);
 538                         break;
 539 #endif
 540                 default:
 541                         return -1;
 542                 }
 543                 if (bp[1] != 0)
 544                         return -1;
 545                 hdrlen = 2;
 546         } else {
 547                 switch (pimv2_addr_len) {
 548                 case sizeof(struct in_addr):
 549                         af = AF_INET;
 550                         break;
 551 #ifdef INET6
 552                 case sizeof(struct in6_addr):
 553                         af = AF_INET6;
 554                         break;
 555 #endif
 556                 default:
 557                         return -1;
 558                         break;
 559                 }
 560                 len = pimv2_addr_len;
 561                 hdrlen = 0;
 562         }
 563
 564         bp += hdrlen;
 565         switch (at) {
 566         case pimv2_unicast:
 567                 TCHECK2(bp[0], len);
 568                 if (af == AF_INET) {
 569                         if (!silent)
 570                                 (void)printf("%s", ipaddr_string(bp));
 571                 }
 572 #ifdef INET6
 573                 else if (af == AF_INET6) {
 574                         if (!silent)
 575                                 (void)printf("%s", ip6addr_string(bp));
 576                 }
 577 #endif
 578                 return hdrlen + len;
 579         case pimv2_group:
 580         case pimv2_source:
 581                 TCHECK2(bp[0], len + 2);
 582                 if (af == AF_INET) {
 583                         if (!silent) {
 584                                 (void)printf("%s", ipaddr_string(bp + 2));
 585                                 if (bp[1] != 32)
 586                                         (void)printf("/%u", bp[1]);
 587                         }
 588                 }
 589 #ifdef INET6
 590                 else if (af == AF_INET6) {
 591                         if (!silent) {
 592                                 (void)printf("%s", ip6addr_string(bp + 2));
 593                                 if (bp[1] != 128)
 594                                         (void)printf("/%u", bp[1]);
 595                         }
 596                 }
 597 #endif
 598                 if (bp[0] && !silent) {
 599                         if (at == pimv2_group) {
 600                                 (void)printf("(0x%02x)", bp[0]);
 601                         } else {
 602                                 (void)printf("(%s%s%s",
 603                                         bp[0] & 0x04 ? "S" : "",
 604                                         bp[0] & 0x02 ? "W" : "",
 605                                         bp[0] & 0x01 ? "R" : "");
 606                                 if (bp[0] & 0xf8) {
 607                                         (void) printf("+0x%02x", bp[0] & 0xf8);
 608                                 }
 609                                 (void)printf(")");
 610                         }
 611                 }
 612                 return hdrlen + 2 + len;
 613         default:
 614                 return -1;
 615         }
 616 trunc:
 617         return -1;
 618 }
 619
 620 static void
 621 pimv2_print(register const u_char *bp, register u_int len, u_int cksum)
 622 {
 623         register const u_char *ep;
 624         register struct pim *pim = (struct pim *)bp;
 625         int advance;
 626
 627         ep = (const u_char *)snapend;
 628         if (bp >= ep)
 629                 return;
 630         if (ep > bp + len)
 631                 ep = bp + len;
 632         TCHECK(pim->pim_rsv);
 633         pimv2_addr_len = pim->pim_rsv;
 634         if (pimv2_addr_len != 0)
 635                 (void)printf(", RFC2117-encoding");
 636
 637         printf(", cksum 0x%04x ", EXTRACT_16BITS(&pim->pim_cksum));
 638         if (EXTRACT_16BITS(&pim->pim_cksum) == 0) {
 639                 printf("(unverified)");
 640         } else {
 641                 printf("(%scorrect)", TTEST2(bp[0], len) && cksum ? "in" : "" );
 642         }
 643
 644         switch (PIM_TYPE(pim->pim_typever)) {
 645         case PIMV2_TYPE_HELLO:
 646             {
 647                 u_int16_t otype, olen;
 648                 bp += 4;
 649                 while (bp < ep) {
 650                         TCHECK2(bp[0], 4);
 651                         otype = EXTRACT_16BITS(&bp[0]);
 652                         olen = EXTRACT_16BITS(&bp[2]);
 653                         TCHECK2(bp[0], 4 + olen);
 654
 655                         printf("\n\t  %s Option (%u), length %u, Value: ",
 656                                tok2str( pimv2_hello_option_values,"Unknown",otype),
 657                                otype,
 658                                olen);
 659                         bp += 4;
 660
 661                         switch (otype) {
 662                         case PIMV2_HELLO_OPTION_HOLDTIME:
 663                                 relts_print(EXTRACT_16BITS(bp));
 664                                 break;
 665
 666                         case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
 667                                 if (olen != 4) {
 668                                         (void)printf("ERROR: Option Lenght != 4 Bytes (%u)", olen);
 669                                 } else {
 670                                         char t_bit;
 671                                         u_int16_t lan_delay, override_interval;
 672                                         lan_delay = EXTRACT_16BITS(bp);
 673                                         override_interval = EXTRACT_16BITS(bp+2);
 674                                         t_bit = (lan_delay & 0x8000)? 1 : 0;
 675                                         lan_delay &= ~0x8000;
 676                                         (void)printf("\n\t    T-bit=%d, LAN delay %dms, Override interval %dms",
 677                                         t_bit, lan_delay, override_interval);
 678                                 }
 679                                 break;
 680
 681                         case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
 682                         case PIMV2_HELLO_OPTION_DR_PRIORITY:
 683                                 switch (olen) {
 684                                 case 0:
 685                                     printf("Bi-Directional Capability (Old)");
 686                                     break;
 687                                 case 4:
 688                                     printf("%u", EXTRACT_32BITS(bp));
 689                                     break;
 690                                 default:
 691                                     printf("ERROR: Option Lenght != 4 Bytes (%u)", olen);
 692                                     break;
 693                                 }
 694                                 break;
 695
 696                         case PIMV2_HELLO_OPTION_GENID:
 697                                 (void)printf("0x%08x", EXTRACT_32BITS(bp));
 698                                 break;
 699
 700                         case PIMV2_HELLO_OPTION_REFRESH_CAP:
 701                                 (void)printf("v%d", *bp);
 702                                 if (*(bp+1) != 0) {
 703                                     (void)printf(", interval ");
 704                                     relts_print(*(bp+1));
 705                                 }
 706                                 if (EXTRACT_16BITS(bp+2) != 0) {
 707                                     (void)printf(" ?0x%04x?", EXTRACT_16BITS(bp+2));
 708                                 }
 709                                 break;
 710
 711                         case  PIMV2_HELLO_OPTION_BIDIR_CAP:
 712                                 break;
 713
 714                         case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
 715                         case PIMV2_HELLO_OPTION_ADDRESS_LIST:
 716                                 if (vflag > 1) {
 717                                         const u_char *ptr = bp;
 718                                         while (ptr < (bp+olen)) {
 719                                                 int advance;
 720
 721                                                 printf("\n\t    ");
 722                                                 advance = pimv2_addr_print(ptr, pimv2_unicast, 0);
 723                                                 if (advance < 0) {
 724                                                         printf("...");
 725                                                         break;
 726                                                 }
 727                                                 ptr += advance;
 728                                         }
 729                                 }
 730                                 break;
 731                         default:
 732                                 if (vflag <= 1)
 733                                     print_unknown_data(bp,"\n\t    ",olen);
 734                                 break;
 735                         }
 736                         /* do we want to see an additionally hexdump ? */
 737                         if (vflag> 1)
 738                             print_unknown_data(bp,"\n\t    ",olen);
 739                         bp += olen;
 740                 }
 741                 break;
 742             }
 743
 744         case PIMV2_TYPE_REGISTER:
 745         {
 746                 struct ip *ip;
 747
 748                 if (!TTEST2(*(bp+4), PIMV2_REGISTER_FLAG_LEN))
 749                         goto trunc;
 750
 751                 printf(", Flags [ %s ]\n\t",
 752                        tok2str(pimv2_register_flag_values,
 753                                "none",
 754                                EXTRACT_32BITS(bp+4)));
 755
 756                 bp += 8; len -= 8;
 757                 /* encapsulated multicast packet */
 758                 ip = (struct ip *)bp;
 759                 switch (IP_V(ip)) {
 760                 case 0: /* Null header */
 761                         (void)printf("IP-Null-header %s > %s",
 762                                      ipaddr_string(&ip->ip_src),
 763                                      ipaddr_string(&ip->ip_dst));
 764                         break;
 765
 766                 case 4: /* IPv4 */
 767                         ip_print(gndo, bp, len);
 768                         break;
 769 #ifdef INET6
 770                 case 6: /* IPv6 */
 771                         ip6_print(bp, len);
 772                         break;
 773 #endif
 774                 default:
 775                         (void)printf("IP ver %d", IP_V(ip));
 776                         break;
 777                 }
 778                 break;
 779         }
 780
 781         case PIMV2_TYPE_REGISTER_STOP:
 782                 bp += 4; len -= 4;
 783                 if (bp >= ep)
 784                         break;
 785                 (void)printf(" group=");
 786                 if ((advance = pimv2_addr_print(bp, pimv2_group, 0)) < 0) {
 787                         (void)printf("...");
 788                         break;
 789                 }
 790                 bp += advance; len -= advance;
 791                 if (bp >= ep)
 792                         break;
 793                 (void)printf(" source=");
 794                 if ((advance = pimv2_addr_print(bp, pimv2_unicast, 0)) < 0) {
 795                         (void)printf("...");
 796                         break;
 797                 }
 798                 bp += advance; len -= advance;
 799                 break;
 800
 801         case PIMV2_TYPE_JOIN_PRUNE:
 802         case PIMV2_TYPE_GRAFT:
 803         case PIMV2_TYPE_GRAFT_ACK:
 804
 805
 806         /*
 807          * 0                   1                   2                   3
 808          *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 809          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 810          *  |PIM Ver| Type  | Addr length   |           Checksum            |
 811          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 812          *  |             Unicast-Upstream Neighbor Address                 |
 813          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 814          *  |  Reserved     | Num groups    |          Holdtime             |
 815          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 816          *  |            Encoded-Multicast Group Address-1                  |
 817          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 818          *  |   Number of Joined  Sources   |   Number of Pruned Sources    |
 819          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 820          *  |               Encoded-Joined Source Address-1                 |
 821          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 822          *  |                             .                                 |
 823          *  |                             .                                 |
 824          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 825          *  |               Encoded-Joined Source Address-n                 |
 826          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 827          *  |               Encoded-Pruned Source Address-1                 |
 828          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 829          *  |                             .                                 |
 830          *  |                             .                                 |
 831          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 832          *  |               Encoded-Pruned Source Address-n                 |
 833          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 834          *  |                           .                                   |
 835          *  |                           .                                   |
 836          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 837          *  |                Encoded-Multicast Group Address-n              |
 838          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 839          */
 840
 841             {
 842                 u_int8_t ngroup;
 843                 u_int16_t holdtime;
 844                 u_int16_t njoin;
 845                 u_int16_t nprune;
 846                 int i, j;
 847
 848                 bp += 4; len -= 4;
 849                 if (PIM_TYPE(pim->pim_typever) != 7) {  /*not for Graft-ACK*/
 850                         if (bp >= ep)
 851                                 break;
 852                         (void)printf(", upstream-neighbor: ");
 853                         if ((advance = pimv2_addr_print(bp, pimv2_unicast, 0)) < 0) {
 854                                 (void)printf("...");
 855                                 break;
 856                         }
 857                         bp += advance; len -= advance;
 858                 }
 859                 if (bp + 4 > ep)
 860                         break;
 861                 ngroup = bp[1];
 862                 holdtime = EXTRACT_16BITS(&bp[2]);
 863                 (void)printf("\n\t  %u group(s)", ngroup);
 864                 if (PIM_TYPE(pim->pim_typever) != 7) {  /*not for Graft-ACK*/
 865                         (void)printf(", holdtime: ");
 866                         if (holdtime == 0xffff)
 867                                 (void)printf("infinite");
 868                         else
 869                                 relts_print(holdtime);
 870                 }
 871                 bp += 4; len -= 4;
 872                 for (i = 0; i < ngroup; i++) {
 873                         if (bp >= ep)
 874                                 goto jp_done;
 875                         (void)printf("\n\t    group #%u: ", i+1);
 876                         if ((advance = pimv2_addr_print(bp, pimv2_group, 0)) < 0) {
 877                                 (void)printf("...)");
 878                                 goto jp_done;
 879                         }
 880                         bp += advance; len -= advance;
 881                         if (bp + 4 > ep) {
 882                                 (void)printf("...)");
 883                                 goto jp_done;
 884                         }
 885                         njoin = EXTRACT_16BITS(&bp[0]);
 886                         nprune = EXTRACT_16BITS(&bp[2]);
 887                         (void)printf(", joined sources: %u, pruned sources: %u", njoin,nprune);
 888                         bp += 4; len -= 4;
 889                         for (j = 0; j < njoin; j++) {
 890                                 (void)printf("\n\t      joined source #%u: ",j+1);
 891                                 if ((advance = pimv2_addr_print(bp, pimv2_source, 0)) < 0) {
 892                                         (void)printf("...)");
 893                                         goto jp_done;
 894                                 }
 895                                 bp += advance; len -= advance;
 896                         }
 897                         for (j = 0; j < nprune; j++) {
 898                                 (void)printf("\n\t      pruned source #%u: ",j+1);
 899                                 if ((advance = pimv2_addr_print(bp, pimv2_source, 0)) < 0) {
 900                                         (void)printf("...)");
 901                                         goto jp_done;
 902                                 }
 903                                 bp += advance; len -= advance;
 904                         }
 905                 }
 906         jp_done:
 907                 break;
 908             }
 909
 910         case PIMV2_TYPE_BOOTSTRAP:
 911         {
 912                 int i, j, frpcnt;
 913                 bp += 4;
 914
 915                 /* Fragment Tag, Hash Mask len, and BSR-priority */
 916                 if (bp + sizeof(u_int16_t) >= ep) break;
 917                 (void)printf(" tag=%x", EXTRACT_16BITS(bp));
 918                 bp += sizeof(u_int16_t);
 919                 if (bp >= ep) break;
 920                 (void)printf(" hashmlen=%d", bp[0]);
 921                 if (bp + 1 >= ep) break;
 922                 (void)printf(" BSRprio=%d", bp[1]);
 923                 bp += 2;
 924
 925                 /* Encoded-Unicast-BSR-Address */
 926                 if (bp >= ep) break;
 927                 (void)printf(" BSR=");
 928                 if ((advance = pimv2_addr_print(bp, pimv2_unicast, 0)) < 0) {
 929                         (void)printf("...");
 930                         break;
 931                 }
 932                 bp += advance;
 933
 934                 for (i = 0; bp < ep; i++) {
 935                         /* Encoded-Group Address */
 936                         (void)printf(" (group%d: ", i);
 937                         if ((advance = pimv2_addr_print(bp, pimv2_group, 0))
 938                             < 0) {
 939                                 (void)printf("...)");
 940                                 goto bs_done;
 941                         }
 942                         bp += advance;
 943
 944                         /* RP-Count, Frag RP-Cnt, and rsvd */
 945                         if (bp >= ep) {
 946                                 (void)printf("...)");
 947                                 goto bs_done;
 948                         }
 949                         (void)printf(" RPcnt=%d", bp[0]);
 950                         if (bp + 1 >= ep) {
 951                                 (void)printf("...)");
 952                                 goto bs_done;
 953                         }
 954                         (void)printf(" FRPcnt=%d", frpcnt = bp[1]);
 955                         bp += 4;
 956
 957                         for (j = 0; j < frpcnt && bp < ep; j++) {
 958                                 /* each RP info */
 959                                 (void)printf(" RP%d=", j);
 960                                 if ((advance = pimv2_addr_print(bp,
 961                                                                 pimv2_unicast,
 962                                                                 0)) < 0) {
 963                                         (void)printf("...)");
 964                                         goto bs_done;
 965                                 }
 966                                 bp += advance;
 967
 968                                 if (bp + 1 >= ep) {
 969                                         (void)printf("...)");
 970                                         goto bs_done;
 971                                 }
 972                                 (void)printf(",holdtime=");
 973                                 relts_print(EXTRACT_16BITS(bp));
 974                                 if (bp + 2 >= ep) {
 975                                         (void)printf("...)");
 976                                         goto bs_done;
 977                                 }
 978                                 (void)printf(",prio=%d", bp[2]);
 979                                 bp += 4;
 980                         }
 981                         (void)printf(")");
 982                 }
 983            bs_done:
 984                 break;
 985         }
 986         case PIMV2_TYPE_ASSERT:
 987                 bp += 4; len -= 4;
 988                 if (bp >= ep)
 989                         break;
 990                 (void)printf(" group=");
 991                 if ((advance = pimv2_addr_print(bp, pimv2_group, 0)) < 0) {
 992                         (void)printf("...");
 993                         break;
 994                 }
 995                 bp += advance; len -= advance;
 996                 if (bp >= ep)
 997                         break;
 998                 (void)printf(" src=");
 999                 if ((advance = pimv2_addr_print(bp, pimv2_unicast, 0)) < 0) {
1000                         (void)printf("...");
1001                         break;
1002                 }
1003                 bp += advance; len -= advance;
1004                 if (bp + 8 > ep)
1005                         break;
1006                 if (bp[0] & 0x80)
1007                         (void)printf(" RPT");
1008                 (void)printf(" pref=%u", EXTRACT_32BITS(&bp[0]) & 0x7fffffff);
1009                 (void)printf(" metric=%u", EXTRACT_32BITS(&bp[4]));
1010                 break;
1011
1012         case PIMV2_TYPE_CANDIDATE_RP:
1013         {
1014                 int i, pfxcnt;
1015                 bp += 4;
1016
1017                 /* Prefix-Cnt, Priority, and Holdtime */
1018                 if (bp >= ep) break;
1019                 (void)printf(" prefix-cnt=%d", bp[0]);
1020                 pfxcnt = bp[0];
1021                 if (bp + 1 >= ep) break;
1022                 (void)printf(" prio=%d", bp[1]);
1023                 if (bp + 3 >= ep) break;
1024                 (void)printf(" holdtime=");
1025                 relts_print(EXTRACT_16BITS(&bp[2]));
1026                 bp += 4;
1027
1028                 /* Encoded-Unicast-RP-Address */
1029                 if (bp >= ep) break;
1030                 (void)printf(" RP=");
1031                 if ((advance = pimv2_addr_print(bp, pimv2_unicast, 0)) < 0) {
1032                         (void)printf("...");
1033                         break;
1034                 }
1035                 bp += advance;
1036
1037                 /* Encoded-Group Addresses */
1038                 for (i = 0; i < pfxcnt && bp < ep; i++) {
1039                         (void)printf(" Group%d=", i);
1040                         if ((advance = pimv2_addr_print(bp, pimv2_group, 0))
1041                             < 0) {
1042                                 (void)printf("...");
1043                                 break;
1044                         }
1045                         bp += advance;
1046                 }
1047                 break;
1048         }
1049
1050         case PIMV2_TYPE_PRUNE_REFRESH:
1051                 (void)printf(" src=");
1052                 if ((advance = pimv2_addr_print(bp, pimv2_unicast, 0)) < 0) {
1053                         (void)printf("...");
1054                         break;
1055                 }
1056                 bp += advance;
1057                 (void)printf(" grp=");
1058                 if ((advance = pimv2_addr_print(bp, pimv2_group, 0)) < 0) {
1059                         (void)printf("...");
1060                         break;
1061                 }
1062                 bp += advance;
1063                 (void)printf(" forwarder=");
1064                 if ((advance = pimv2_addr_print(bp, pimv2_unicast, 0)) < 0) {
1065                         (void)printf("...");
1066                         break;
1067                 }
1068                 bp += advance;
1069                 TCHECK2(bp[0], 2);
1070                 (void)printf(" TUNR ");
1071                 relts_print(EXTRACT_16BITS(bp));
1072                 break;
1073
1074
1075          default:
1076                 (void)printf(" [type %d]", PIM_TYPE(pim->pim_typever));
1077                 break;
1078         }
1079
1080         return;
1081
1082 trunc:
1083         (void)printf("[|pim]");
1084 }
1085
1086 /*
1087  * Local Variables:
1088  * c-style: whitesmith
1089  * c-basic-offset: 8
1090  * End:
1091  */