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