contrib/tcpdump/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 /* \summary: Protocol Independent Multicast (PIM) printer */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include <netdissect-stdinc.h>
  29
  30 #include "netdissect.h"
  31 #include "addrtoname.h"
  32 #include "extract.h"
  33
  34 #include "ip.h"
  35 #include "ip6.h"
  36 #include "ipproto.h"
  37
  38 #define PIMV1_TYPE_QUERY           0
  39 #define PIMV1_TYPE_REGISTER        1
  40 #define PIMV1_TYPE_REGISTER_STOP   2
  41 #define PIMV1_TYPE_JOIN_PRUNE      3
  42 #define PIMV1_TYPE_RP_REACHABILITY 4
  43 #define PIMV1_TYPE_ASSERT          5
  44 #define PIMV1_TYPE_GRAFT           6
  45 #define PIMV1_TYPE_GRAFT_ACK       7
  46
  47 static const struct tok pimv1_type_str[] = {
  48         { PIMV1_TYPE_QUERY,           "Query"         },
  49         { PIMV1_TYPE_REGISTER,        "Register"      },
  50         { PIMV1_TYPE_REGISTER_STOP,   "Register-Stop" },
  51         { PIMV1_TYPE_JOIN_PRUNE,      "Join/Prune"    },
  52         { PIMV1_TYPE_RP_REACHABILITY, "RP-reachable"  },
  53         { PIMV1_TYPE_ASSERT,          "Assert"        },
  54         { PIMV1_TYPE_GRAFT,           "Graft"         },
  55         { PIMV1_TYPE_GRAFT_ACK,       "Graft-ACK"     },
  56         { 0, NULL }
  57 };
  58
  59 #define PIMV2_TYPE_HELLO         0
  60 #define PIMV2_TYPE_REGISTER      1
  61 #define PIMV2_TYPE_REGISTER_STOP 2
  62 #define PIMV2_TYPE_JOIN_PRUNE    3
  63 #define PIMV2_TYPE_BOOTSTRAP     4
  64 #define PIMV2_TYPE_ASSERT        5
  65 #define PIMV2_TYPE_GRAFT         6
  66 #define PIMV2_TYPE_GRAFT_ACK     7
  67 #define PIMV2_TYPE_CANDIDATE_RP  8
  68 #define PIMV2_TYPE_PRUNE_REFRESH 9
  69 #define PIMV2_TYPE_DF_ELECTION   10
  70 #define PIMV2_TYPE_ECMP_REDIRECT 11
  71
  72 static const struct tok pimv2_type_values[] = {
  73     { PIMV2_TYPE_HELLO,         "Hello" },
  74     { PIMV2_TYPE_REGISTER,      "Register" },
  75     { PIMV2_TYPE_REGISTER_STOP, "Register Stop" },
  76     { PIMV2_TYPE_JOIN_PRUNE,    "Join / Prune" },
  77     { PIMV2_TYPE_BOOTSTRAP,     "Bootstrap" },
  78     { PIMV2_TYPE_ASSERT,        "Assert" },
  79     { PIMV2_TYPE_GRAFT,         "Graft" },
  80     { PIMV2_TYPE_GRAFT_ACK,     "Graft Acknowledgement" },
  81     { PIMV2_TYPE_CANDIDATE_RP,  "Candidate RP Advertisement" },
  82     { PIMV2_TYPE_PRUNE_REFRESH, "Prune Refresh" },
  83     { PIMV2_TYPE_DF_ELECTION,   "DF Election" },
  84     { PIMV2_TYPE_ECMP_REDIRECT, "ECMP Redirect" },
  85     { 0, NULL}
  86 };
  87
  88 #define PIMV2_HELLO_OPTION_HOLDTIME             1
  89 #define PIMV2_HELLO_OPTION_LANPRUNEDELAY        2
  90 #define PIMV2_HELLO_OPTION_DR_PRIORITY_OLD     18
  91 #define PIMV2_HELLO_OPTION_DR_PRIORITY         19
  92 #define PIMV2_HELLO_OPTION_GENID               20
  93 #define PIMV2_HELLO_OPTION_REFRESH_CAP         21
  94 #define PIMV2_HELLO_OPTION_BIDIR_CAP           22
  95 #define PIMV2_HELLO_OPTION_ADDRESS_LIST        24
  96 #define PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD 65001
  97
  98 static const struct tok pimv2_hello_option_values[] = {
  99     { PIMV2_HELLO_OPTION_HOLDTIME,         "Hold Time" },
 100     { PIMV2_HELLO_OPTION_LANPRUNEDELAY,    "LAN Prune Delay" },
 101     { PIMV2_HELLO_OPTION_DR_PRIORITY_OLD,  "DR Priority (Old)" },
 102     { PIMV2_HELLO_OPTION_DR_PRIORITY,      "DR Priority" },
 103     { PIMV2_HELLO_OPTION_GENID,            "Generation ID" },
 104     { PIMV2_HELLO_OPTION_REFRESH_CAP,      "State Refresh Capability" },
 105     { PIMV2_HELLO_OPTION_BIDIR_CAP,        "Bi-Directional Capability" },
 106     { PIMV2_HELLO_OPTION_ADDRESS_LIST,     "Address List" },
 107     { PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD, "Address List (Old)" },
 108     { 0, NULL}
 109 };
 110
 111 #define PIMV2_REGISTER_FLAG_LEN      4
 112 #define PIMV2_REGISTER_FLAG_BORDER 0x80000000
 113 #define PIMV2_REGISTER_FLAG_NULL   0x40000000
 114
 115 static const struct tok pimv2_register_flag_values[] = {
 116     { PIMV2_REGISTER_FLAG_BORDER, "Border" },
 117     { PIMV2_REGISTER_FLAG_NULL, "Null" },
 118     { 0, NULL}
 119 };
 120
 121 /*
 122  * XXX: We consider a case where IPv6 is not ready yet for portability,
 123  * but PIM dependent defintions should be independent of IPv6...
 124  */
 125
 126 struct pim {
 127         uint8_t pim_typever;
 128                         /* upper 4bit: PIM version number; 2 for PIMv2 */
 129                         /* lower 4bit: the PIM message type, currently they are:
 130                          * Hello, Register, Register-Stop, Join/Prune,
 131                          * Bootstrap, Assert, Graft (PIM-DM only),
 132                          * Graft-Ack (PIM-DM only), C-RP-Adv
 133                          */
 134 #define PIM_VER(x)      (((x) & 0xf0) >> 4)
 135 #define PIM_TYPE(x)     ((x) & 0x0f)
 136         u_char  pim_rsv;        /* Reserved */
 137         u_short pim_cksum;      /* IP style check sum */
 138 };
 139
 140 static void pimv2_print(netdissect_options *, register const u_char *bp, register u_int len, const u_char *);
 141
 142 static void
 143 pimv1_join_prune_print(netdissect_options *ndo,
 144                        register const u_char *bp, register u_int len)
 145 {
 146         int ngroups, njoin, nprune;
 147         int njp;
 148
 149         /* If it's a single group and a single source, use 1-line output. */
 150         if (ND_TTEST2(bp[0], 30) && bp[11] == 1 &&
 151             ((njoin = EXTRACT_16BITS(&bp[20])) + EXTRACT_16BITS(&bp[22])) == 1) {
 152                 int hold;
 153
 154                 ND_PRINT((ndo, " RPF %s ", ipaddr_string(ndo, bp)));
 155                 hold = EXTRACT_16BITS(&bp[6]);
 156                 if (hold != 180) {
 157                         ND_PRINT((ndo, "Hold "));
 158                         unsigned_relts_print(ndo, hold);
 159                 }
 160                 ND_PRINT((ndo, "%s (%s/%d, %s", njoin ? "Join" : "Prune",
 161                 ipaddr_string(ndo, &bp[26]), bp[25] & 0x3f,
 162                 ipaddr_string(ndo, &bp[12])));
 163                 if (EXTRACT_32BITS(&bp[16]) != 0xffffffff)
 164                         ND_PRINT((ndo, "/%s", ipaddr_string(ndo, &bp[16])));
 165                 ND_PRINT((ndo, ") %s%s %s",
 166                     (bp[24] & 0x01) ? "Sparse" : "Dense",
 167                     (bp[25] & 0x80) ? " WC" : "",
 168                     (bp[25] & 0x40) ? "RP" : "SPT"));
 169                 return;
 170         }
 171
 172         if (len < sizeof(struct in_addr))
 173                 goto trunc;
 174         ND_TCHECK2(bp[0], sizeof(struct in_addr));
 175         if (ndo->ndo_vflag > 1)
 176                 ND_PRINT((ndo, "\n"));
 177         ND_PRINT((ndo, " Upstream Nbr: %s", ipaddr_string(ndo, bp)));
 178         bp += 4;
 179         len -= 4;
 180         if (len < 4)
 181                 goto trunc;
 182         ND_TCHECK2(bp[2], 2);
 183         if (ndo->ndo_vflag > 1)
 184                 ND_PRINT((ndo, "\n"));
 185         ND_PRINT((ndo, " Hold time: "));
 186         unsigned_relts_print(ndo, EXTRACT_16BITS(&bp[2]));
 187         if (ndo->ndo_vflag < 2)
 188                 return;
 189         bp += 4;
 190         len -= 4;
 191
 192         if (len < 4)
 193                 goto trunc;
 194         ND_TCHECK2(bp[0], 4);
 195         ngroups = bp[3];
 196         bp += 4;
 197         len -= 4;
 198         while (ngroups--) {
 199                 /*
 200                  * XXX - does the address have length "addrlen" and the
 201                  * mask length "maddrlen"?
 202                  */
 203                 if (len < 4)
 204                         goto trunc;
 205                 ND_TCHECK2(bp[0], sizeof(struct in_addr));
 206                 ND_PRINT((ndo, "\n\tGroup: %s", ipaddr_string(ndo, bp)));
 207                 bp += 4;
 208                 len -= 4;
 209                 if (len < 4)
 210                         goto trunc;
 211                 ND_TCHECK2(bp[0], sizeof(struct in_addr));
 212                 if (EXTRACT_32BITS(&bp[0]) != 0xffffffff)
 213                         ND_PRINT((ndo, "/%s", ipaddr_string(ndo, &bp[0])));
 214                 bp += 4;
 215                 len -= 4;
 216                 if (len < 4)
 217                         goto trunc;
 218                 ND_TCHECK2(bp[0], 4);
 219                 njoin = EXTRACT_16BITS(&bp[0]);
 220                 nprune = EXTRACT_16BITS(&bp[2]);
 221                 ND_PRINT((ndo, " joined: %d pruned: %d", njoin, nprune));
 222                 bp += 4;
 223                 len -= 4;
 224                 for (njp = 0; njp < (njoin + nprune); njp++) {
 225                         const char *type;
 226
 227                         if (njp < njoin)
 228                                 type = "Join ";
 229                         else
 230                                 type = "Prune";
 231                         if (len < 6)
 232                                 goto trunc;
 233                         ND_TCHECK2(bp[0], 6);
 234                         ND_PRINT((ndo, "\n\t%s %s%s%s%s/%d", type,
 235                             (bp[0] & 0x01) ? "Sparse " : "Dense ",
 236                             (bp[1] & 0x80) ? "WC " : "",
 237                             (bp[1] & 0x40) ? "RP " : "SPT ",
 238                             ipaddr_string(ndo, &bp[2]),
 239                             bp[1] & 0x3f));
 240                         bp += 6;
 241                         len -= 6;
 242                 }
 243         }
 244         return;
 245 trunc:
 246         ND_PRINT((ndo, "[|pim]"));
 247         return;
 248 }
 249
 250 void
 251 pimv1_print(netdissect_options *ndo,
 252             register const u_char *bp, register u_int len)
 253 {
 254         register u_char type;
 255
 256         ND_TCHECK(bp[1]);
 257         type = bp[1];
 258
 259         ND_PRINT((ndo, " %s", tok2str(pimv1_type_str, "[type %u]", type)));
 260         switch (type) {
 261         case PIMV1_TYPE_QUERY:
 262                 if (ND_TTEST(bp[8])) {
 263                         switch (bp[8] >> 4) {
 264                         case 0:
 265                                 ND_PRINT((ndo, " Dense-mode"));
 266                                 break;
 267                         case 1:
 268                                 ND_PRINT((ndo, " Sparse-mode"));
 269                                 break;
 270                         case 2:
 271                                 ND_PRINT((ndo, " Sparse-Dense-mode"));
 272                                 break;
 273                         default:
 274                                 ND_PRINT((ndo, " mode-%d", bp[8] >> 4));
 275                                 break;
 276                         }
 277                 }
 278                 if (ndo->ndo_vflag) {
 279                         ND_TCHECK2(bp[10],2);
 280                         ND_PRINT((ndo, " (Hold-time "));
 281                         unsigned_relts_print(ndo, EXTRACT_16BITS(&bp[10]));
 282                         ND_PRINT((ndo, ")"));
 283                 }
 284                 break;
 285
 286         case PIMV1_TYPE_REGISTER:
 287                 ND_TCHECK2(bp[8], 20);                  /* ip header */
 288                 ND_PRINT((ndo, " for %s > %s", ipaddr_string(ndo, &bp[20]),
 289                     ipaddr_string(ndo, &bp[24])));
 290                 break;
 291         case PIMV1_TYPE_REGISTER_STOP:
 292                 ND_TCHECK2(bp[12], sizeof(struct in_addr));
 293                 ND_PRINT((ndo, " for %s > %s", ipaddr_string(ndo, &bp[8]),
 294                     ipaddr_string(ndo, &bp[12])));
 295                 break;
 296         case PIMV1_TYPE_RP_REACHABILITY:
 297                 if (ndo->ndo_vflag) {
 298                         ND_TCHECK2(bp[22], 2);
 299                         ND_PRINT((ndo, " group %s", ipaddr_string(ndo, &bp[8])));
 300                         if (EXTRACT_32BITS(&bp[12]) != 0xffffffff)
 301                                 ND_PRINT((ndo, "/%s", ipaddr_string(ndo, &bp[12])));
 302                         ND_PRINT((ndo, " RP %s hold ", ipaddr_string(ndo, &bp[16])));
 303                         unsigned_relts_print(ndo, EXTRACT_16BITS(&bp[22]));
 304                 }
 305                 break;
 306         case PIMV1_TYPE_ASSERT:
 307                 ND_TCHECK2(bp[16], sizeof(struct in_addr));
 308                 ND_PRINT((ndo, " for %s > %s", ipaddr_string(ndo, &bp[16]),
 309                     ipaddr_string(ndo, &bp[8])));
 310                 if (EXTRACT_32BITS(&bp[12]) != 0xffffffff)
 311                         ND_PRINT((ndo, "/%s", ipaddr_string(ndo, &bp[12])));
 312                 ND_TCHECK2(bp[24], 4);
 313                 ND_PRINT((ndo, " %s pref %d metric %d",
 314                     (bp[20] & 0x80) ? "RP-tree" : "SPT",
 315                 EXTRACT_32BITS(&bp[20]) & 0x7fffffff,
 316                 EXTRACT_32BITS(&bp[24])));
 317                 break;
 318         case PIMV1_TYPE_JOIN_PRUNE:
 319         case PIMV1_TYPE_GRAFT:
 320         case PIMV1_TYPE_GRAFT_ACK:
 321                 if (ndo->ndo_vflag) {
 322                         if (len < 8)
 323                                 goto trunc;
 324                         pimv1_join_prune_print(ndo, &bp[8], len - 8);
 325                 }
 326                 break;
 327         }
 328         ND_TCHECK(bp[4]);
 329         if ((bp[4] >> 4) != 1)
 330                 ND_PRINT((ndo, " [v%d]", bp[4] >> 4));
 331         return;
 332
 333 trunc:
 334         ND_PRINT((ndo, "[|pim]"));
 335         return;
 336 }
 337
 338 /*
 339  * auto-RP is a cisco protocol, documented at
 340  * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
 341  *
 342  * This implements version 1+, dated Sept 9, 1998.
 343  */
 344 void
 345 cisco_autorp_print(netdissect_options *ndo,
 346                    register const u_char *bp, register u_int len)
 347 {
 348         int type;
 349         int numrps;
 350         int hold;
 351
 352         if (len < 8)
 353                 goto trunc;
 354         ND_TCHECK(bp[0]);
 355         ND_PRINT((ndo, " auto-rp "));
 356         type = bp[0];
 357         switch (type) {
 358         case 0x11:
 359                 ND_PRINT((ndo, "candidate-advert"));
 360                 break;
 361         case 0x12:
 362                 ND_PRINT((ndo, "mapping"));
 363                 break;
 364         default:
 365                 ND_PRINT((ndo, "type-0x%02x", type));
 366                 break;
 367         }
 368
 369         ND_TCHECK(bp[1]);
 370         numrps = bp[1];
 371
 372         ND_TCHECK2(bp[2], 2);
 373         ND_PRINT((ndo, " Hold "));
 374         hold = EXTRACT_16BITS(&bp[2]);
 375         if (hold)
 376                 unsigned_relts_print(ndo, EXTRACT_16BITS(&bp[2]));
 377         else
 378                 ND_PRINT((ndo, "FOREVER"));
 379
 380         /* Next 4 bytes are reserved. */
 381
 382         bp += 8; len -= 8;
 383
 384         /*XXX skip unless -v? */
 385
 386         /*
 387          * Rest of packet:
 388          * numrps entries of the form:
 389          * 32 bits: RP
 390          * 6 bits: reserved
 391          * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
 392          * 8 bits: # of entries for this RP
 393          * each entry: 7 bits: reserved, 1 bit: negative,
 394          *             8 bits: mask 32 bits: source
 395          * lather, rinse, repeat.
 396          */
 397         while (numrps--) {
 398                 int nentries;
 399                 char s;
 400
 401                 if (len < 4)
 402                         goto trunc;
 403                 ND_TCHECK2(bp[0], 4);
 404                 ND_PRINT((ndo, " RP %s", ipaddr_string(ndo, bp)));
 405                 bp += 4;
 406                 len -= 4;
 407                 if (len < 1)
 408                         goto trunc;
 409                 ND_TCHECK(bp[0]);
 410                 switch (bp[0] & 0x3) {
 411                 case 0: ND_PRINT((ndo, " PIMv?"));
 412                         break;
 413                 case 1: ND_PRINT((ndo, " PIMv1"));
 414                         break;
 415                 case 2: ND_PRINT((ndo, " PIMv2"));
 416                         break;
 417                 case 3: ND_PRINT((ndo, " PIMv1+2"));
 418                         break;
 419                 }
 420                 if (bp[0] & 0xfc)
 421                         ND_PRINT((ndo, " [rsvd=0x%02x]", bp[0] & 0xfc));
 422                 bp += 1;
 423                 len -= 1;
 424                 if (len < 1)
 425                         goto trunc;
 426                 ND_TCHECK(bp[0]);
 427                 nentries = bp[0];
 428                 bp += 1;
 429                 len -= 1;
 430                 s = ' ';
 431                 for (; nentries; nentries--) {
 432                         if (len < 6)
 433                                 goto trunc;
 434                         ND_TCHECK2(bp[0], 6);
 435                         ND_PRINT((ndo, "%c%s%s/%d", s, bp[0] & 1 ? "!" : "",
 436                                   ipaddr_string(ndo, &bp[2]), bp[1]));
 437                         if (bp[0] & 0x02) {
 438                                 ND_PRINT((ndo, " bidir"));
 439                         }
 440                         if (bp[0] & 0xfc) {
 441                                 ND_PRINT((ndo, "[rsvd=0x%02x]", bp[0] & 0xfc));
 442                         }
 443                         s = ',';
 444                         bp += 6; len -= 6;
 445                 }
 446         }
 447         return;
 448
 449 trunc:
 450         ND_PRINT((ndo, "[|autorp]"));
 451         return;
 452 }
 453
 454 void
 455 pim_print(netdissect_options *ndo,
 456           register const u_char *bp, register u_int len, const u_char *bp2)
 457 {
 458         register const struct pim *pim = (const struct pim *)bp;
 459
 460 #ifdef notyet                   /* currently we see only version and type */
 461         ND_TCHECK(pim->pim_rsv);
 462 #endif
 463
 464         ND_TCHECK(pim->pim_typever);
 465         switch (PIM_VER(pim->pim_typever)) {
 466         case 2:
 467                 if (!ndo->ndo_vflag) {
 468                         ND_PRINT((ndo, "PIMv%u, %s, length %u",
 469                                   PIM_VER(pim->pim_typever),
 470                                   tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim->pim_typever)),
 471                                   len));
 472                         return;
 473                 } else {
 474                         ND_PRINT((ndo, "PIMv%u, length %u\n\t%s",
 475                                   PIM_VER(pim->pim_typever),
 476                                   len,
 477                                   tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim->pim_typever))));
 478                         pimv2_print(ndo, bp, len, bp2);
 479                 }
 480                 break;
 481         default:
 482                 ND_PRINT((ndo, "PIMv%u, length %u",
 483                           PIM_VER(pim->pim_typever),
 484                           len));
 485                 break;
 486         }
 487         return;
 488
 489 trunc:
 490         ND_PRINT((ndo, "[|pim]"));
 491         return;
 492 }
 493
 494 /*
 495  * PIMv2 uses encoded address representations.
 496  *
 497  * The last PIM-SM I-D before RFC2117 was published specified the
 498  * following representation for unicast addresses.  However, RFC2117
 499  * specified no encoding for unicast addresses with the unicast
 500  * address length specified in the header.  Therefore, we have to
 501  * guess which encoding is being used (Cisco's PIMv2 implementation
 502  * uses the non-RFC encoding).  RFC2117 turns a previously "Reserved"
 503  * field into a 'unicast-address-length-in-bytes' field.  We guess
 504  * that it's the draft encoding if this reserved field is zero.
 505  *
 506  * RFC2362 goes back to the encoded format, and calls the addr length
 507  * field "reserved" again.
 508  *
 509  * The first byte is the address family, from:
 510  *
 511  *    0    Reserved
 512  *    1    IP (IP version 4)
 513  *    2    IP6 (IP version 6)
 514  *    3    NSAP
 515  *    4    HDLC (8-bit multidrop)
 516  *    5    BBN 1822
 517  *    6    802 (includes all 802 media plus Ethernet "canonical format")
 518  *    7    E.163
 519  *    8    E.164 (SMDS, Frame Relay, ATM)
 520  *    9    F.69 (Telex)
 521  *   10    X.121 (X.25, Frame Relay)
 522  *   11    IPX
 523  *   12    Appletalk
 524  *   13    Decnet IV
 525  *   14    Banyan Vines
 526  *   15    E.164 with NSAP format subaddress
 527  *
 528  * In addition, the second byte is an "Encoding".  0 is the default
 529  * encoding for the address family, and no other encodings are currently
 530  * specified.
 531  *
 532  */
 533
 534 enum pimv2_addrtype {
 535         pimv2_unicast, pimv2_group, pimv2_source
 536 };
 537
 538 /*  0                   1                   2                   3
 539  *  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
 540  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 541  * | Addr Family   | Encoding Type |     Unicast Address           |
 542  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
 543  *  0                   1                   2                   3
 544  *  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
 545  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 546  * | Addr Family   | Encoding Type |   Reserved    |  Mask Len     |
 547  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 548  * |                Group multicast Address                        |
 549  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 550  *  0                   1                   2                   3
 551  *  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
 552  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 553  * | Addr Family   | Encoding Type | Rsrvd   |S|W|R|  Mask Len     |
 554  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 555  * |                        Source Address                         |
 556  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 557  */
 558 static int
 559 pimv2_addr_print(netdissect_options *ndo,
 560                  const u_char *bp, u_int len, enum pimv2_addrtype at,
 561                  u_int addr_len, int silent)
 562 {
 563         int af;
 564         int hdrlen;
 565
 566         if (addr_len == 0) {
 567                 if (len < 2)
 568                         goto trunc;
 569                 ND_TCHECK(bp[1]);
 570                 switch (bp[0]) {
 571                 case 1:
 572                         af = AF_INET;
 573                         addr_len = (u_int)sizeof(struct in_addr);
 574                         break;
 575                 case 2:
 576                         af = AF_INET6;
 577                         addr_len = (u_int)sizeof(struct in6_addr);
 578                         break;
 579                 default:
 580                         return -1;
 581                 }
 582                 if (bp[1] != 0)
 583                         return -1;
 584                 hdrlen = 2;
 585         } else {
 586                 switch (addr_len) {
 587                 case sizeof(struct in_addr):
 588                         af = AF_INET;
 589                         break;
 590                 case sizeof(struct in6_addr):
 591                         af = AF_INET6;
 592                         break;
 593                 default:
 594                         return -1;
 595                         break;
 596                 }
 597                 hdrlen = 0;
 598         }
 599
 600         bp += hdrlen;
 601         len -= hdrlen;
 602         switch (at) {
 603         case pimv2_unicast:
 604                 if (len < addr_len)
 605                         goto trunc;
 606                 ND_TCHECK2(bp[0], addr_len);
 607                 if (af == AF_INET) {
 608                         if (!silent)
 609                                 ND_PRINT((ndo, "%s", ipaddr_string(ndo, bp)));
 610                 }
 611                 else if (af == AF_INET6) {
 612                         if (!silent)
 613                                 ND_PRINT((ndo, "%s", ip6addr_string(ndo, bp)));
 614                 }
 615                 return hdrlen + addr_len;
 616         case pimv2_group:
 617         case pimv2_source:
 618                 if (len < addr_len + 2)
 619                         goto trunc;
 620                 ND_TCHECK2(bp[0], addr_len + 2);
 621                 if (af == AF_INET) {
 622                         if (!silent) {
 623                                 ND_PRINT((ndo, "%s", ipaddr_string(ndo, bp + 2)));
 624                                 if (bp[1] != 32)
 625                                         ND_PRINT((ndo, "/%u", bp[1]));
 626                         }
 627                 }
 628                 else if (af == AF_INET6) {
 629                         if (!silent) {
 630                                 ND_PRINT((ndo, "%s", ip6addr_string(ndo, bp + 2)));
 631                                 if (bp[1] != 128)
 632                                         ND_PRINT((ndo, "/%u", bp[1]));
 633                         }
 634                 }
 635                 if (bp[0] && !silent) {
 636                         if (at == pimv2_group) {
 637                                 ND_PRINT((ndo, "(0x%02x)", bp[0]));
 638                         } else {
 639                                 ND_PRINT((ndo, "(%s%s%s",
 640                                         bp[0] & 0x04 ? "S" : "",
 641                                         bp[0] & 0x02 ? "W" : "",
 642                                         bp[0] & 0x01 ? "R" : ""));
 643                                 if (bp[0] & 0xf8) {
 644                                         ND_PRINT((ndo, "+0x%02x", bp[0] & 0xf8));
 645                                 }
 646                                 ND_PRINT((ndo, ")"));
 647                         }
 648                 }
 649                 return hdrlen + 2 + addr_len;
 650         default:
 651                 return -1;
 652         }
 653 trunc:
 654         return -1;
 655 }
 656
 657 enum checksum_status {
 658         CORRECT,
 659         INCORRECT,
 660         UNVERIFIED
 661 };
 662
 663 static enum checksum_status
 664 pimv2_check_checksum(netdissect_options *ndo, const u_char *bp,
 665                      const u_char *bp2, u_int len)
 666 {
 667         const struct ip *ip;
 668         u_int cksum;
 669
 670         if (!ND_TTEST2(bp[0], len)) {
 671                 /* We don't have all the data. */
 672                 return (UNVERIFIED);
 673         }
 674         ip = (const struct ip *)bp2;
 675         if (IP_V(ip) == 4) {
 676                 struct cksum_vec vec[1];
 677
 678                 vec[0].ptr = bp;
 679                 vec[0].len = len;
 680                 cksum = in_cksum(vec, 1);
 681                 return (cksum ? INCORRECT : CORRECT);
 682         } else if (IP_V(ip) == 6) {
 683                 const struct ip6_hdr *ip6;
 684
 685                 ip6 = (const struct ip6_hdr *)bp2;
 686                 cksum = nextproto6_cksum(ndo, ip6, bp, len, len, IPPROTO_PIM);
 687                 return (cksum ? INCORRECT : CORRECT);
 688         } else {
 689                 return (UNVERIFIED);
 690         }
 691 }
 692
 693 static void
 694 pimv2_print(netdissect_options *ndo,
 695             register const u_char *bp, register u_int len, const u_char *bp2)
 696 {
 697         register const struct pim *pim = (const struct pim *)bp;
 698         int advance;
 699         enum checksum_status cksum_status;
 700         int pimv2_addr_len;
 701
 702         if (len < 2)
 703                 goto trunc;
 704         ND_TCHECK(pim->pim_rsv);
 705         pimv2_addr_len = pim->pim_rsv;
 706         if (pimv2_addr_len != 0)
 707                 ND_PRINT((ndo, ", RFC2117-encoding"));
 708
 709         if (len < 4)
 710                 goto trunc;
 711         ND_TCHECK(pim->pim_cksum);
 712         ND_PRINT((ndo, ", cksum 0x%04x ", EXTRACT_16BITS(&pim->pim_cksum)));
 713         if (EXTRACT_16BITS(&pim->pim_cksum) == 0) {
 714                 ND_PRINT((ndo, "(unverified)"));
 715         } else {
 716                 if (PIM_TYPE(pim->pim_typever) == PIMV2_TYPE_REGISTER) {
 717                         /*
 718                          * The checksum only covers the packet header,
 719                          * not the encapsulated packet.
 720                          */
 721                         cksum_status = pimv2_check_checksum(ndo, bp, bp2, 8);
 722                         if (cksum_status == INCORRECT) {
 723                                 /*
 724                                  * To quote RFC 4601, "For interoperability
 725                                  * reasons, a message carrying a checksum
 726                                  * calculated over the entire PIM Register
 727                                  * message should also be accepted."
 728                                  */
 729                                 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
 730                         }
 731                 } else {
 732                         /*
 733                          * The checksum covers the entire packet.
 734                          */
 735                         cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
 736                 }
 737                 switch (cksum_status) {
 738
 739                 case CORRECT:
 740                         ND_PRINT((ndo, "(correct)"));
 741                         break;
 742
 743                 case INCORRECT:
 744                         ND_PRINT((ndo, "(incorrect)"));
 745                         break;
 746
 747                 case UNVERIFIED:
 748                         ND_PRINT((ndo, "(unverified)"));
 749                         break;
 750                 }
 751         }
 752         bp += 4;
 753         len -= 4;
 754
 755         switch (PIM_TYPE(pim->pim_typever)) {
 756         case PIMV2_TYPE_HELLO:
 757             {
 758                 uint16_t otype, olen;
 759                 while (len > 0) {
 760                         if (len < 4)
 761                                 goto trunc;
 762                         ND_TCHECK2(bp[0], 4);
 763                         otype = EXTRACT_16BITS(&bp[0]);
 764                         olen = EXTRACT_16BITS(&bp[2]);
 765                         ND_PRINT((ndo, "\n\t  %s Option (%u), length %u, Value: ",
 766                                   tok2str(pimv2_hello_option_values, "Unknown", otype),
 767                                   otype,
 768                                   olen));
 769                         bp += 4;
 770                         len -= 4;
 771
 772                         if (len < olen)
 773                                 goto trunc;
 774                         ND_TCHECK2(bp[0], olen);
 775                         switch (otype) {
 776                         case PIMV2_HELLO_OPTION_HOLDTIME:
 777                                 if (olen != 2) {
 778                                         ND_PRINT((ndo, "ERROR: Option Length != 2 Bytes (%u)", olen));
 779                                 } else {
 780                                         unsigned_relts_print(ndo, EXTRACT_16BITS(bp));
 781                                 }
 782                                 break;
 783
 784                         case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
 785                                 if (olen != 4) {
 786                                         ND_PRINT((ndo, "ERROR: Option Length != 4 Bytes (%u)", olen));
 787                                 } else {
 788                                         char t_bit;
 789                                         uint16_t lan_delay, override_interval;
 790                                         lan_delay = EXTRACT_16BITS(bp);
 791                                         override_interval = EXTRACT_16BITS(bp+2);
 792                                         t_bit = (lan_delay & 0x8000)? 1 : 0;
 793                                         lan_delay &= ~0x8000;
 794                                         ND_PRINT((ndo, "\n\t    T-bit=%d, LAN delay %dms, Override interval %dms",
 795                                         t_bit, lan_delay, override_interval));
 796                                 }
 797                                 break;
 798
 799                         case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
 800                         case PIMV2_HELLO_OPTION_DR_PRIORITY:
 801                                 switch (olen) {
 802                                 case 0:
 803                                         ND_PRINT((ndo, "Bi-Directional Capability (Old)"));
 804                                         break;
 805                                 case 4:
 806                                         ND_PRINT((ndo, "%u", EXTRACT_32BITS(bp)));
 807                                         break;
 808                                 default:
 809                                         ND_PRINT((ndo, "ERROR: Option Length != 4 Bytes (%u)", olen));
 810                                         break;
 811                                 }
 812                                 break;
 813
 814                         case PIMV2_HELLO_OPTION_GENID:
 815                                 if (olen != 4) {
 816                                         ND_PRINT((ndo, "ERROR: Option Length != 4 Bytes (%u)", olen));
 817                                 } else {
 818                                         ND_PRINT((ndo, "0x%08x", EXTRACT_32BITS(bp)));
 819                                 }
 820                                 break;
 821
 822                         case PIMV2_HELLO_OPTION_REFRESH_CAP:
 823                                 if (olen != 4) {
 824                                         ND_PRINT((ndo, "ERROR: Option Length != 4 Bytes (%u)", olen));
 825                                 } else {
 826                                         ND_PRINT((ndo, "v%d", *bp));
 827                                         if (*(bp+1) != 0) {
 828                                                 ND_PRINT((ndo, ", interval "));
 829                                                 unsigned_relts_print(ndo, *(bp+1));
 830                                         }
 831                                         if (EXTRACT_16BITS(bp+2) != 0) {
 832                                                 ND_PRINT((ndo, " ?0x%04x?", EXTRACT_16BITS(bp+2)));
 833                                         }
 834                                 }
 835                                 break;
 836
 837                         case  PIMV2_HELLO_OPTION_BIDIR_CAP:
 838                                 break;
 839
 840                         case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
 841                         case PIMV2_HELLO_OPTION_ADDRESS_LIST:
 842                                 if (ndo->ndo_vflag > 1) {
 843                                         const u_char *ptr = bp;
 844                                         u_int plen = len;
 845                                         while (ptr < (bp+olen)) {
 846                                                 ND_PRINT((ndo, "\n\t    "));
 847                                                 advance = pimv2_addr_print(ndo, ptr, plen, pimv2_unicast, pimv2_addr_len, 0);
 848                                                 if (advance < 0)
 849                                                         goto trunc;
 850                                                 ptr += advance;
 851                                                 plen -= advance;
 852                                         }
 853                                 }
 854                                 break;
 855                         default:
 856                                 if (ndo->ndo_vflag <= 1)
 857                                         print_unknown_data(ndo, bp, "\n\t    ", olen);
 858                                 break;
 859                         }
 860                         /* do we want to see an additionally hexdump ? */
 861                         if (ndo->ndo_vflag> 1)
 862                                 print_unknown_data(ndo, bp, "\n\t    ", olen);
 863                         bp += olen;
 864                         len -= olen;
 865                 }
 866                 break;
 867             }
 868
 869         case PIMV2_TYPE_REGISTER:
 870         {
 871                 const struct ip *ip;
 872
 873                 if (len < 4)
 874                         goto trunc;
 875                 ND_TCHECK2(*bp, PIMV2_REGISTER_FLAG_LEN);
 876
 877                 ND_PRINT((ndo, ", Flags [ %s ]\n\t",
 878                           tok2str(pimv2_register_flag_values,
 879                           "none",
 880                           EXTRACT_32BITS(bp))));
 881
 882                 bp += 4; len -= 4;
 883                 /* encapsulated multicast packet */
 884                 if (len == 0)
 885                         goto trunc;
 886                 ip = (const struct ip *)bp;
 887                 ND_TCHECK(ip->ip_vhl);
 888                 switch (IP_V(ip)) {
 889                 case 0: /* Null header */
 890                         ND_TCHECK(ip->ip_dst);
 891                         ND_PRINT((ndo, "IP-Null-header %s > %s",
 892                                   ipaddr_string(ndo, &ip->ip_src),
 893                                   ipaddr_string(ndo, &ip->ip_dst)));
 894                         break;
 895
 896                 case 4: /* IPv4 */
 897                         ip_print(ndo, bp, len);
 898                         break;
 899
 900                 case 6: /* IPv6 */
 901                         ip6_print(ndo, bp, len);
 902                         break;
 903
 904                 default:
 905                         ND_PRINT((ndo, "IP ver %d", IP_V(ip)));
 906                         break;
 907                 }
 908                 break;
 909         }
 910
 911         case PIMV2_TYPE_REGISTER_STOP:
 912                 ND_PRINT((ndo, " group="));
 913                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
 914                         goto trunc;
 915                 bp += advance; len -= advance;
 916                 ND_PRINT((ndo, " source="));
 917                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
 918                         goto trunc;
 919                 bp += advance; len -= advance;
 920                 break;
 921
 922         case PIMV2_TYPE_JOIN_PRUNE:
 923         case PIMV2_TYPE_GRAFT:
 924         case PIMV2_TYPE_GRAFT_ACK:
 925
 926
 927         /*
 928          * 0                   1                   2                   3
 929          *   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
 930          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 931          *  |PIM Ver| Type  | Addr length   |           Checksum            |
 932          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 933          *  |             Unicast-Upstream Neighbor Address                 |
 934          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 935          *  |  Reserved     | Num groups    |          Holdtime             |
 936          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 937          *  |            Encoded-Multicast Group Address-1                  |
 938          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 939          *  |   Number of Joined  Sources   |   Number of Pruned Sources    |
 940          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 941          *  |               Encoded-Joined Source Address-1                 |
 942          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 943          *  |                             .                                 |
 944          *  |                             .                                 |
 945          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 946          *  |               Encoded-Joined Source Address-n                 |
 947          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 948          *  |               Encoded-Pruned Source Address-1                 |
 949          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 950          *  |                             .                                 |
 951          *  |                             .                                 |
 952          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 953          *  |               Encoded-Pruned Source Address-n                 |
 954          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 955          *  |                           .                                   |
 956          *  |                           .                                   |
 957          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 958          *  |                Encoded-Multicast Group Address-n              |
 959          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 960          */
 961
 962             {
 963                 uint8_t ngroup;
 964                 uint16_t holdtime;
 965                 uint16_t njoin;
 966                 uint16_t nprune;
 967                 int i, j;
 968
 969                 if (PIM_TYPE(pim->pim_typever) != 7) {  /*not for Graft-ACK*/
 970                         ND_PRINT((ndo, ", upstream-neighbor: "));
 971                         if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
 972                                 goto trunc;
 973                         bp += advance; len -= advance;
 974                 }
 975                 if (len < 4)
 976                         goto trunc;
 977                 ND_TCHECK2(*bp, 4);
 978                 ngroup = bp[1];
 979                 holdtime = EXTRACT_16BITS(&bp[2]);
 980                 ND_PRINT((ndo, "\n\t  %u group(s)", ngroup));
 981                 if (PIM_TYPE(pim->pim_typever) != 7) {  /*not for Graft-ACK*/
 982                         ND_PRINT((ndo, ", holdtime: "));
 983                         if (holdtime == 0xffff)
 984                                 ND_PRINT((ndo, "infinite"));
 985                         else
 986                                 unsigned_relts_print(ndo, holdtime);
 987                 }
 988                 bp += 4; len -= 4;
 989                 for (i = 0; i < ngroup; i++) {
 990                         ND_PRINT((ndo, "\n\t    group #%u: ", i+1));
 991                         if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
 992                                 goto trunc;
 993                         bp += advance; len -= advance;
 994                         if (len < 4)
 995                                 goto trunc;
 996                         ND_TCHECK2(*bp, 4);
 997                         njoin = EXTRACT_16BITS(&bp[0]);
 998                         nprune = EXTRACT_16BITS(&bp[2]);
 999                         ND_PRINT((ndo, ", joined sources: %u, pruned sources: %u", njoin, nprune));
1000                         bp += 4; len -= 4;
1001                         for (j = 0; j < njoin; j++) {
1002                                 ND_PRINT((ndo, "\n\t      joined source #%u: ", j+1));
1003                                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1004                                         goto trunc;
1005                                 bp += advance; len -= advance;
1006                         }
1007                         for (j = 0; j < nprune; j++) {
1008                                 ND_PRINT((ndo, "\n\t      pruned source #%u: ", j+1));
1009                                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1010                                         goto trunc;
1011                                 bp += advance; len -= advance;
1012                         }
1013                 }
1014                 break;
1015             }
1016
1017         case PIMV2_TYPE_BOOTSTRAP:
1018         {
1019                 int i, j, frpcnt;
1020
1021                 /* Fragment Tag, Hash Mask len, and BSR-priority */
1022                 if (len < 2)
1023                         goto trunc;
1024                 ND_TCHECK_16BITS(bp);
1025                 ND_PRINT((ndo, " tag=%x", EXTRACT_16BITS(bp)));
1026                 bp += 2;
1027                 len -= 2;
1028                 if (len < 1)
1029                         goto trunc;
1030                 ND_TCHECK(bp[0]);
1031                 ND_PRINT((ndo, " hashmlen=%d", bp[0]));
1032                 if (len < 2)
1033                         goto trunc;
1034                 ND_TCHECK(bp[2]);
1035                 ND_PRINT((ndo, " BSRprio=%d", bp[1]));
1036                 bp += 2;
1037                 len -= 2;
1038
1039                 /* Encoded-Unicast-BSR-Address */
1040                 ND_PRINT((ndo, " BSR="));
1041                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1042                         goto trunc;
1043                 bp += advance;
1044                 len -= advance;
1045
1046                 for (i = 0; len > 0; i++) {
1047                         /* Encoded-Group Address */
1048                         ND_PRINT((ndo, " (group%d: ", i));
1049                         if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1050                                 goto trunc;
1051                         bp += advance;
1052                         len -= advance;
1053
1054                         /* RP-Count, Frag RP-Cnt, and rsvd */
1055                         if (len < 1)
1056                                 goto trunc;
1057                         ND_TCHECK(bp[0]);
1058                         ND_PRINT((ndo, " RPcnt=%d", bp[0]));
1059                         if (len < 2)
1060                                 goto trunc;
1061                         ND_TCHECK(bp[1]);
1062                         ND_PRINT((ndo, " FRPcnt=%d", frpcnt = bp[1]));
1063                         if (len < 4)
1064                                 goto trunc;
1065                         bp += 4;
1066                         len -= 4;
1067
1068                         for (j = 0; j < frpcnt && len > 0; j++) {
1069                                 /* each RP info */
1070                                 ND_PRINT((ndo, " RP%d=", j));
1071                                 if ((advance = pimv2_addr_print(ndo, bp, len,
1072                                                                 pimv2_unicast,
1073                                                                 pimv2_addr_len,
1074                                                                 0)) < 0)
1075                                         goto trunc;
1076                                 bp += advance;
1077                                 len -= advance;
1078
1079                                 if (len < 2)
1080                                         goto trunc;
1081                                 ND_TCHECK_16BITS(bp);
1082                                 ND_PRINT((ndo, ",holdtime="));
1083                                 unsigned_relts_print(ndo, EXTRACT_16BITS(bp));
1084                                 if (len < 3)
1085                                         goto trunc;
1086                                 ND_TCHECK(bp[2]);
1087                                 ND_PRINT((ndo, ",prio=%d", bp[2]));
1088                                 if (len < 4)
1089                                         goto trunc;
1090                                 bp += 4;
1091                                 len -= 4;
1092                         }
1093                         ND_PRINT((ndo, ")"));
1094                 }
1095                 break;
1096         }
1097         case PIMV2_TYPE_ASSERT:
1098                 ND_PRINT((ndo, " group="));
1099                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1100                         goto trunc;
1101                 bp += advance; len -= advance;
1102                 ND_PRINT((ndo, " src="));
1103                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1104                         goto trunc;
1105                 bp += advance; len -= advance;
1106                 if (len < 8)
1107                         goto trunc;
1108                 ND_TCHECK2(*bp, 8);
1109                 if (bp[0] & 0x80)
1110                         ND_PRINT((ndo, " RPT"));
1111                 ND_PRINT((ndo, " pref=%u", EXTRACT_32BITS(&bp[0]) & 0x7fffffff));
1112                 ND_PRINT((ndo, " metric=%u", EXTRACT_32BITS(&bp[4])));
1113                 break;
1114
1115         case PIMV2_TYPE_CANDIDATE_RP:
1116         {
1117                 int i, pfxcnt;
1118
1119                 /* Prefix-Cnt, Priority, and Holdtime */
1120                 if (len < 1)
1121                         goto trunc;
1122                 ND_TCHECK(bp[0]);
1123                 ND_PRINT((ndo, " prefix-cnt=%d", bp[0]));
1124                 pfxcnt = bp[0];
1125                 if (len < 2)
1126                         goto trunc;
1127                 ND_TCHECK(bp[1]);
1128                 ND_PRINT((ndo, " prio=%d", bp[1]));
1129                 if (len < 4)
1130                         goto trunc;
1131                 ND_TCHECK_16BITS(&bp[2]);
1132                 ND_PRINT((ndo, " holdtime="));
1133                 unsigned_relts_print(ndo, EXTRACT_16BITS(&bp[2]));
1134                 bp += 4;
1135                 len -= 4;
1136
1137                 /* Encoded-Unicast-RP-Address */
1138                 ND_PRINT((ndo, " RP="));
1139                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1140                         goto trunc;
1141                 bp += advance;
1142                 len -= advance;
1143
1144                 /* Encoded-Group Addresses */
1145                 for (i = 0; i < pfxcnt && len > 0; i++) {
1146                         ND_PRINT((ndo, " Group%d=", i));
1147                         if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1148                                 goto trunc;
1149                         bp += advance;
1150                         len -= advance;
1151                 }
1152                 break;
1153         }
1154
1155         case PIMV2_TYPE_PRUNE_REFRESH:
1156                 ND_PRINT((ndo, " src="));
1157                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1158                         goto trunc;
1159                 bp += advance;
1160                 len -= advance;
1161                 ND_PRINT((ndo, " grp="));
1162                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1163                         goto trunc;
1164                 bp += advance;
1165                 len -= advance;
1166                 ND_PRINT((ndo, " forwarder="));
1167                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1168                         goto trunc;
1169                 bp += advance;
1170                 len -= advance;
1171                 if (len < 2)
1172                         goto trunc;
1173                 ND_TCHECK_16BITS(bp);
1174                 ND_PRINT((ndo, " TUNR "));
1175                 unsigned_relts_print(ndo, EXTRACT_16BITS(bp));
1176                 break;
1177
1178
1179          default:
1180                 ND_PRINT((ndo, " [type %d]", PIM_TYPE(pim->pim_typever)));
1181                 break;
1182         }
1183
1184         return;
1185
1186 trunc:
1187         ND_PRINT((ndo, "[|pim]"));
1188 }
1189
1190 /*
1191  * Local Variables:
1192  * c-style: whitesmith
1193  * c-basic-offset: 8
1194  * End:
1195  */