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 #define PIMV2_DF_ELECTION_OFFER                  1
 122 #define PIMV2_DF_ELECTION_WINNER                 2
 123 #define PIMV2_DF_ELECTION_BACKOFF                3
 124 #define PIMV2_DF_ELECTION_PASS                   4
 125
 126 static const struct tok pimv2_df_election_flag_values[] = {
 127     { PIMV2_DF_ELECTION_OFFER, "Offer" },
 128     { PIMV2_DF_ELECTION_WINNER, "Winner" },
 129     { PIMV2_DF_ELECTION_BACKOFF, "Backoff" },
 130     { PIMV2_DF_ELECTION_PASS, "Pass" },
 131     { 0, NULL}
 132 };
 133
 134 #define PIMV2_DF_ELECTION_PASS_BACKOFF_STR(x)   ( \
 135       x == PIMV2_DF_ELECTION_BACKOFF ? "offer" : "new winner" )
 136
 137
 138 /*
 139  * XXX: We consider a case where IPv6 is not ready yet for portability,
 140  * but PIM dependent definitions should be independent of IPv6...
 141  */
 142
 143 struct pim {
 144         nd_uint8_t      pim_typever;
 145                         /* upper 4bit: PIM version number; 2 for PIMv2 */
 146                         /* lower 4bit: the PIM message type, currently they are:
 147                          * Hello, Register, Register-Stop, Join/Prune,
 148                          * Bootstrap, Assert, Graft (PIM-DM only),
 149                          * Graft-Ack (PIM-DM only), C-RP-Adv
 150                          */
 151 #define PIM_VER(x)      (((x) & 0xf0) >> 4)
 152 #define PIM_TYPE(x)     ((x) & 0x0f)
 153         nd_uint8_t      pim_rsv;        /* Reserved in v1, subtype+address length in v2 */
 154 #define PIM_SUBTYPE(x)  (((x) & 0xf0) >> 4)
 155         nd_uint16_t     pim_cksum;      /* IP style check sum */
 156 };
 157
 158 static void pimv2_print(netdissect_options *, const u_char *bp, u_int len, const u_char *);
 159
 160 static void
 161 pimv1_join_prune_print(netdissect_options *ndo,
 162                        const u_char *bp, u_int len)
 163 {
 164         u_int ngroups, njoin, nprune;
 165         u_int njp;
 166
 167         /* If it's a single group and a single source, use 1-line output. */
 168         if (ND_TTEST_LEN(bp, 30) && GET_U_1(bp + 11) == 1 &&
 169             ((njoin = GET_BE_U_2(bp + 20)) + GET_BE_U_2(bp + 22)) == 1) {
 170                 u_int hold;
 171
 172                 ND_PRINT(" RPF %s ", GET_IPADDR_STRING(bp));
 173                 hold = GET_BE_U_2(bp + 6);
 174                 if (hold != 180) {
 175                         ND_PRINT("Hold ");
 176                         unsigned_relts_print(ndo, hold);
 177                 }
 178                 ND_PRINT("%s (%s/%u, %s", njoin ? "Join" : "Prune",
 179                 GET_IPADDR_STRING(bp + 26), GET_U_1(bp + 25) & 0x3f,
 180                 GET_IPADDR_STRING(bp + 12));
 181                 if (GET_BE_U_4(bp + 16) != 0xffffffff)
 182                         ND_PRINT("/%s", GET_IPADDR_STRING(bp + 16));
 183                 ND_PRINT(") %s%s %s",
 184                     (GET_U_1(bp + 24) & 0x01) ? "Sparse" : "Dense",
 185                     (GET_U_1(bp + 25) & 0x80) ? " WC" : "",
 186                     (GET_U_1(bp + 25) & 0x40) ? "RP" : "SPT");
 187                 return;
 188         }
 189
 190         if (len < sizeof(nd_ipv4))
 191                 goto trunc;
 192         if (ndo->ndo_vflag > 1)
 193                 ND_PRINT("\n");
 194         ND_PRINT(" Upstream Nbr: %s", GET_IPADDR_STRING(bp));
 195         bp += 4;
 196         len -= 4;
 197         if (len < 4)
 198                 goto trunc;
 199         if (ndo->ndo_vflag > 1)
 200                 ND_PRINT("\n");
 201         ND_PRINT(" Hold time: ");
 202         unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
 203         if (ndo->ndo_vflag < 2)
 204                 return;
 205         bp += 4;
 206         len -= 4;
 207
 208         if (len < 4)
 209                 goto trunc;
 210         ngroups = GET_U_1(bp + 3);
 211         bp += 4;
 212         len -= 4;
 213         while (ngroups != 0) {
 214                 /*
 215                  * XXX - does the address have length "addrlen" and the
 216                  * mask length "maddrlen"?
 217                  */
 218                 if (len < 4)
 219                         goto trunc;
 220                 ND_PRINT("\n\tGroup: %s", GET_IPADDR_STRING(bp));
 221                 bp += 4;
 222                 len -= 4;
 223                 if (len < 4)
 224                         goto trunc;
 225                 if (GET_BE_U_4(bp) != 0xffffffff)
 226                         ND_PRINT("/%s", GET_IPADDR_STRING(bp));
 227                 bp += 4;
 228                 len -= 4;
 229                 if (len < 4)
 230                         goto trunc;
 231                 njoin = GET_BE_U_2(bp);
 232                 nprune = GET_BE_U_2(bp + 2);
 233                 ND_PRINT(" joined: %u pruned: %u", njoin, nprune);
 234                 bp += 4;
 235                 len -= 4;
 236                 for (njp = 0; njp < (njoin + nprune); njp++) {
 237                         const char *type;
 238
 239                         if (njp < njoin)
 240                                 type = "Join ";
 241                         else
 242                                 type = "Prune";
 243                         if (len < 6)
 244                                 goto trunc;
 245                         ND_PRINT("\n\t%s %s%s%s%s/%u", type,
 246                             (GET_U_1(bp) & 0x01) ? "Sparse " : "Dense ",
 247                             (GET_U_1(bp + 1) & 0x80) ? "WC " : "",
 248                             (GET_U_1(bp + 1) & 0x40) ? "RP " : "SPT ",
 249                             GET_IPADDR_STRING(bp + 2),
 250                             GET_U_1(bp + 1) & 0x3f);
 251                         bp += 6;
 252                         len -= 6;
 253                 }
 254                 ngroups--;
 255         }
 256         return;
 257 trunc:
 258         nd_print_trunc(ndo);
 259 }
 260
 261 void
 262 pimv1_print(netdissect_options *ndo,
 263             const u_char *bp, u_int len)
 264 {
 265         u_char type;
 266
 267         ndo->ndo_protocol = "pimv1";
 268         type = GET_U_1(bp + 1);
 269
 270         ND_PRINT(" %s", tok2str(pimv1_type_str, "[type %u]", type));
 271         switch (type) {
 272         case PIMV1_TYPE_QUERY:
 273                 if (ND_TTEST_1(bp + 8)) {
 274                         switch (GET_U_1(bp + 8) >> 4) {
 275                         case 0:
 276                                 ND_PRINT(" Dense-mode");
 277                                 break;
 278                         case 1:
 279                                 ND_PRINT(" Sparse-mode");
 280                                 break;
 281                         case 2:
 282                                 ND_PRINT(" Sparse-Dense-mode");
 283                                 break;
 284                         default:
 285                                 ND_PRINT(" mode-%u", GET_U_1(bp + 8) >> 4);
 286                                 break;
 287                         }
 288                 }
 289                 if (ndo->ndo_vflag) {
 290                         ND_PRINT(" (Hold-time ");
 291                         unsigned_relts_print(ndo, GET_BE_U_2(bp + 10));
 292                         ND_PRINT(")");
 293                 }
 294                 break;
 295
 296         case PIMV1_TYPE_REGISTER:
 297                 ND_TCHECK_LEN(bp + 8, 20);                      /* ip header */
 298                 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 20),
 299                           GET_IPADDR_STRING(bp + 24));
 300                 break;
 301         case PIMV1_TYPE_REGISTER_STOP:
 302                 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 8),
 303                           GET_IPADDR_STRING(bp + 12));
 304                 break;
 305         case PIMV1_TYPE_RP_REACHABILITY:
 306                 if (ndo->ndo_vflag) {
 307                         ND_PRINT(" group %s", GET_IPADDR_STRING(bp + 8));
 308                         if (GET_BE_U_4(bp + 12) != 0xffffffff)
 309                                 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
 310                         ND_PRINT(" RP %s hold ", GET_IPADDR_STRING(bp + 16));
 311                         unsigned_relts_print(ndo, GET_BE_U_2(bp + 22));
 312                 }
 313                 break;
 314         case PIMV1_TYPE_ASSERT:
 315                 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 16),
 316                           GET_IPADDR_STRING(bp + 8));
 317                 if (GET_BE_U_4(bp + 12) != 0xffffffff)
 318                         ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
 319                 ND_PRINT(" %s pref %u metric %u",
 320                     (GET_U_1(bp + 20) & 0x80) ? "RP-tree" : "SPT",
 321                     GET_BE_U_4(bp + 20) & 0x7fffffff,
 322                     GET_BE_U_4(bp + 24));
 323                 break;
 324         case PIMV1_TYPE_JOIN_PRUNE:
 325         case PIMV1_TYPE_GRAFT:
 326         case PIMV1_TYPE_GRAFT_ACK:
 327                 if (ndo->ndo_vflag) {
 328                         if (len < 8)
 329                                 goto trunc;
 330                         pimv1_join_prune_print(ndo, bp + 8, len - 8);
 331                 }
 332                 break;
 333         }
 334         if ((GET_U_1(bp + 4) >> 4) != 1)
 335                 ND_PRINT(" [v%u]", GET_U_1(bp + 4) >> 4);
 336         return;
 337
 338 trunc:
 339         nd_print_trunc(ndo);
 340 }
 341
 342 /*
 343  * auto-RP is a cisco protocol, documented at
 344  * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
 345  *
 346  * This implements version 1+, dated Sept 9, 1998.
 347  */
 348 void
 349 cisco_autorp_print(netdissect_options *ndo,
 350                    const u_char *bp, u_int len)
 351 {
 352         u_int type;
 353         u_int numrps;
 354         u_int hold;
 355
 356         ndo->ndo_protocol = "cisco_autorp";
 357         if (len < 8)
 358                 goto trunc;
 359         ND_PRINT(" auto-rp ");
 360         type = GET_U_1(bp);
 361         switch (type) {
 362         case 0x11:
 363                 ND_PRINT("candidate-advert");
 364                 break;
 365         case 0x12:
 366                 ND_PRINT("mapping");
 367                 break;
 368         default:
 369                 ND_PRINT("type-0x%02x", type);
 370                 break;
 371         }
 372
 373         numrps = GET_U_1(bp + 1);
 374
 375         ND_PRINT(" Hold ");
 376         hold = GET_BE_U_2(bp + 2);
 377         if (hold)
 378                 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
 379         else
 380                 ND_PRINT("FOREVER");
 381
 382         /* Next 4 bytes are reserved. */
 383
 384         bp += 8; len -= 8;
 385
 386         /*XXX skip unless -v? */
 387
 388         /*
 389          * Rest of packet:
 390          * numrps entries of the form:
 391          * 32 bits: RP
 392          * 6 bits: reserved
 393          * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
 394          * 8 bits: # of entries for this RP
 395          * each entry: 7 bits: reserved, 1 bit: negative,
 396          *             8 bits: mask 32 bits: source
 397          * lather, rinse, repeat.
 398          */
 399         while (numrps != 0) {
 400                 u_int nentries;
 401                 char s;
 402
 403                 if (len < 4)
 404                         goto trunc;
 405                 ND_PRINT(" RP %s", GET_IPADDR_STRING(bp));
 406                 bp += 4;
 407                 len -= 4;
 408                 if (len < 1)
 409                         goto trunc;
 410                 switch (GET_U_1(bp) & 0x3) {
 411                 case 0: ND_PRINT(" PIMv?");
 412                         break;
 413                 case 1: ND_PRINT(" PIMv1");
 414                         break;
 415                 case 2: ND_PRINT(" PIMv2");
 416                         break;
 417                 case 3: ND_PRINT(" PIMv1+2");
 418                         break;
 419                 }
 420                 if (GET_U_1(bp) & 0xfc)
 421                         ND_PRINT(" [rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
 422                 bp += 1;
 423                 len -= 1;
 424                 if (len < 1)
 425                         goto trunc;
 426                 nentries = GET_U_1(bp);
 427                 bp += 1;
 428                 len -= 1;
 429                 s = ' ';
 430                 while (nentries != 0) {
 431                         if (len < 6)
 432                                 goto trunc;
 433                         ND_PRINT("%c%s%s/%u", s, GET_U_1(bp) & 1 ? "!" : "",
 434                                   GET_IPADDR_STRING(bp + 2), GET_U_1(bp + 1));
 435                         if (GET_U_1(bp) & 0x02) {
 436                                 ND_PRINT(" bidir");
 437                         }
 438                         if (GET_U_1(bp) & 0xfc) {
 439                                 ND_PRINT("[rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
 440                         }
 441                         s = ',';
 442                         bp += 6; len -= 6;
 443                         nentries--;
 444                 }
 445                 numrps--;
 446         }
 447         return;
 448
 449 trunc:
 450         nd_print_trunc(ndo);
 451 }
 452
 453 void
 454 pim_print(netdissect_options *ndo,
 455           const u_char *bp, u_int len, const u_char *bp2)
 456 {
 457         const struct pim *pim = (const struct pim *)bp;
 458         uint8_t pim_typever;
 459
 460         ndo->ndo_protocol = "pim";
 461
 462         pim_typever = GET_U_1(pim->pim_typever);
 463         switch (PIM_VER(pim_typever)) {
 464         case 2:
 465                 if (!ndo->ndo_vflag) {
 466                         ND_PRINT("PIMv%u, %s, length %u",
 467                                   PIM_VER(pim_typever),
 468                                   tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)),
 469                                   len);
 470                         return;
 471                 } else {
 472                         ND_PRINT("PIMv%u, length %u\n\t%s",
 473                                   PIM_VER(pim_typever),
 474                                   len,
 475                                   tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)));
 476                         pimv2_print(ndo, bp, len, bp2);
 477                 }
 478                 break;
 479         default:
 480                 ND_PRINT("PIMv%u, length %u",
 481                           PIM_VER(pim_typever),
 482                           len);
 483                 break;
 484         }
 485 }
 486
 487 /*
 488  * PIMv2 uses encoded address representations.
 489  *
 490  * The last PIM-SM I-D before RFC2117 was published specified the
 491  * following representation for unicast addresses.  However, RFC2117
 492  * specified no encoding for unicast addresses with the unicast
 493  * address length specified in the header.  Therefore, we have to
 494  * guess which encoding is being used (Cisco's PIMv2 implementation
 495  * uses the non-RFC encoding).  RFC2117 turns a previously "Reserved"
 496  * field into a 'unicast-address-length-in-bytes' field.  We guess
 497  * that it's the draft encoding if this reserved field is zero.
 498  *
 499  * RFC2362 goes back to the encoded format, and calls the addr length
 500  * field "reserved" again.
 501  *
 502  * The first byte is the address family, from:
 503  *
 504  *    0    Reserved
 505  *    1    IP (IP version 4)
 506  *    2    IP6 (IP version 6)
 507  *    3    NSAP
 508  *    4    HDLC (8-bit multidrop)
 509  *    5    BBN 1822
 510  *    6    802 (includes all 802 media plus Ethernet "canonical format")
 511  *    7    E.163
 512  *    8    E.164 (SMDS, Frame Relay, ATM)
 513  *    9    F.69 (Telex)
 514  *   10    X.121 (X.25, Frame Relay)
 515  *   11    IPX
 516  *   12    Appletalk
 517  *   13    Decnet IV
 518  *   14    Banyan Vines
 519  *   15    E.164 with NSAP format subaddress
 520  *
 521  * In addition, the second byte is an "Encoding".  0 is the default
 522  * encoding for the address family, and no other encodings are currently
 523  * specified.
 524  *
 525  */
 526
 527 enum pimv2_addrtype {
 528         pimv2_unicast, pimv2_group, pimv2_source
 529 };
 530
 531 /*  0                   1                   2                   3
 532  *  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
 533  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 534  * | Addr Family   | Encoding Type |     Unicast Address           |
 535  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
 536  *  0                   1                   2                   3
 537  *  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
 538  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 539  * | Addr Family   | Encoding Type |   Reserved    |  Mask Len     |
 540  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 541  * |                Group multicast 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 | Rsrvd   |S|W|R|  Mask Len     |
 547  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 548  * |                        Source Address                         |
 549  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 550  */
 551 static int
 552 pimv2_addr_print(netdissect_options *ndo,
 553                  const u_char *bp, u_int len, enum pimv2_addrtype at,
 554                  u_int addr_len, int silent)
 555 {
 556         u_int af;
 557         int hdrlen;
 558
 559         if (addr_len == 0) {
 560                 if (len < 2)
 561                         goto trunc;
 562                 switch (GET_U_1(bp)) {
 563                 case 1:
 564                         af = AF_INET;
 565                         addr_len = (u_int)sizeof(nd_ipv4);
 566                         break;
 567                 case 2:
 568                         af = AF_INET6;
 569                         addr_len = (u_int)sizeof(nd_ipv6);
 570                         break;
 571                 default:
 572                         return -1;
 573                 }
 574                 if (GET_U_1(bp + 1) != 0)
 575                         return -1;
 576                 hdrlen = 2;
 577         } else {
 578                 switch (addr_len) {
 579                 case sizeof(nd_ipv4):
 580                         af = AF_INET;
 581                         break;
 582                 case sizeof(nd_ipv6):
 583                         af = AF_INET6;
 584                         break;
 585                 default:
 586                         return -1;
 587                         break;
 588                 }
 589                 hdrlen = 0;
 590         }
 591
 592         bp += hdrlen;
 593         len -= hdrlen;
 594         switch (at) {
 595         case pimv2_unicast:
 596                 if (len < addr_len)
 597                         goto trunc;
 598                 ND_TCHECK_LEN(bp, addr_len);
 599                 if (af == AF_INET) {
 600                         if (!silent)
 601                                 ND_PRINT("%s", GET_IPADDR_STRING(bp));
 602                 }
 603                 else if (af == AF_INET6) {
 604                         if (!silent)
 605                                 ND_PRINT("%s", GET_IP6ADDR_STRING(bp));
 606                 }
 607                 return hdrlen + addr_len;
 608         case pimv2_group:
 609         case pimv2_source:
 610                 if (len < addr_len + 2)
 611                         goto trunc;
 612                 ND_TCHECK_LEN(bp, addr_len + 2);
 613                 if (af == AF_INET) {
 614                         if (!silent) {
 615                                 ND_PRINT("%s", GET_IPADDR_STRING(bp + 2));
 616                                 if (GET_U_1(bp + 1) != 32)
 617                                         ND_PRINT("/%u", GET_U_1(bp + 1));
 618                         }
 619                 }
 620                 else if (af == AF_INET6) {
 621                         if (!silent) {
 622                                 ND_PRINT("%s", GET_IP6ADDR_STRING(bp + 2));
 623                                 if (GET_U_1(bp + 1) != 128)
 624                                         ND_PRINT("/%u", GET_U_1(bp + 1));
 625                         }
 626                 }
 627                 if (GET_U_1(bp) && !silent) {
 628                         if (at == pimv2_group) {
 629                                 ND_PRINT("(0x%02x)", GET_U_1(bp));
 630                         } else {
 631                                 ND_PRINT("(%s%s%s",
 632                                         GET_U_1(bp) & 0x04 ? "S" : "",
 633                                         GET_U_1(bp) & 0x02 ? "W" : "",
 634                                         GET_U_1(bp) & 0x01 ? "R" : "");
 635                                 if (GET_U_1(bp) & 0xf8) {
 636                                         ND_PRINT("+0x%02x",
 637                                                  GET_U_1(bp) & 0xf8);
 638                                 }
 639                                 ND_PRINT(")");
 640                         }
 641                 }
 642                 return hdrlen + 2 + addr_len;
 643         default:
 644                 return -1;
 645         }
 646 trunc:
 647         return -1;
 648 }
 649
 650 enum checksum_status {
 651         CORRECT,
 652         INCORRECT,
 653         UNVERIFIED
 654 };
 655
 656 static enum checksum_status
 657 pimv2_check_checksum(netdissect_options *ndo, const u_char *bp,
 658                      const u_char *bp2, u_int len)
 659 {
 660         const struct ip *ip;
 661         u_int cksum;
 662
 663         if (!ND_TTEST_LEN(bp, len)) {
 664                 /* We don't have all the data. */
 665                 return (UNVERIFIED);
 666         }
 667         ip = (const struct ip *)bp2;
 668         if (IP_V(ip) == 4) {
 669                 struct cksum_vec vec[1];
 670
 671                 vec[0].ptr = bp;
 672                 vec[0].len = len;
 673                 cksum = in_cksum(vec, 1);
 674                 return (cksum ? INCORRECT : CORRECT);
 675         } else if (IP_V(ip) == 6) {
 676                 const struct ip6_hdr *ip6;
 677
 678                 ip6 = (const struct ip6_hdr *)bp2;
 679                 cksum = nextproto6_cksum(ndo, ip6, bp, len, len, IPPROTO_PIM);
 680                 return (cksum ? INCORRECT : CORRECT);
 681         } else {
 682                 return (UNVERIFIED);
 683         }
 684 }
 685
 686 static void
 687 pimv2_print(netdissect_options *ndo,
 688             const u_char *bp, u_int len, const u_char *bp2)
 689 {
 690         const struct pim *pim = (const struct pim *)bp;
 691         int advance;
 692         int subtype;
 693         enum checksum_status cksum_status;
 694         u_int pim_typever;
 695         u_int pimv2_addr_len;
 696
 697         ndo->ndo_protocol = "pimv2";
 698         if (len < 2) {
 699                 ND_PRINT("[length %u < 2]", len);
 700                 nd_print_invalid(ndo);
 701                 return;
 702         }
 703         pim_typever = GET_U_1(pim->pim_typever);
 704         /* RFC5015 allocates the high 4 bits of pim_rsv for "subtype". */
 705         pimv2_addr_len = GET_U_1(pim->pim_rsv) & 0x0f;
 706         if (pimv2_addr_len != 0)
 707                 ND_PRINT(", RFC2117-encoding");
 708
 709         if (len < 4) {
 710                 ND_PRINT("[length %u < 4]", len);
 711                 nd_print_invalid(ndo);
 712                 return;
 713         }
 714         ND_PRINT(", cksum 0x%04x ", GET_BE_U_2(pim->pim_cksum));
 715         if (GET_BE_U_2(pim->pim_cksum) == 0) {
 716                 ND_PRINT("(unverified)");
 717         } else {
 718                 if (PIM_TYPE(pim_typever) == PIMV2_TYPE_REGISTER) {
 719                         /*
 720                          * The checksum only covers the packet header,
 721                          * not the encapsulated packet.
 722                          */
 723                         cksum_status = pimv2_check_checksum(ndo, bp, bp2, 8);
 724                         if (cksum_status == INCORRECT) {
 725                                 /*
 726                                  * To quote RFC 4601, "For interoperability
 727                                  * reasons, a message carrying a checksum
 728                                  * calculated over the entire PIM Register
 729                                  * message should also be accepted."
 730                                  */
 731                                 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
 732                         }
 733                 } else {
 734                         /*
 735                          * The checksum covers the entire packet.
 736                          */
 737                         cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
 738                 }
 739                 switch (cksum_status) {
 740
 741                 case CORRECT:
 742                         ND_PRINT("(correct)");
 743                         break;
 744
 745                 case INCORRECT:
 746                         ND_PRINT("(incorrect)");
 747                         break;
 748
 749                 case UNVERIFIED:
 750                         ND_PRINT("(unverified)");
 751                         break;
 752                 }
 753         }
 754         bp += 4;
 755         len -= 4;
 756
 757         switch (PIM_TYPE(pim_typever)) {
 758         case PIMV2_TYPE_HELLO:
 759             {
 760                 uint16_t otype, olen;
 761                 while (len > 0) {
 762                         if (len < 4)
 763                                 goto trunc;
 764                         otype = GET_BE_U_2(bp);
 765                         olen = GET_BE_U_2(bp + 2);
 766                         ND_PRINT("\n\t  %s Option (%u), length %u, Value: ",
 767                                   tok2str(pimv2_hello_option_values, "Unknown", otype),
 768                                   otype,
 769                                   olen);
 770                         bp += 4;
 771                         len -= 4;
 772
 773                         if (len < olen)
 774                                 goto trunc;
 775                         ND_TCHECK_LEN(bp, olen);
 776                         switch (otype) {
 777                         case PIMV2_HELLO_OPTION_HOLDTIME:
 778                                 if (olen != 2) {
 779                                         ND_PRINT("[option length %u != 2]", olen);
 780                                         nd_print_invalid(ndo);
 781                                         return;
 782                                 } else {
 783                                         unsigned_relts_print(ndo,
 784                                                              GET_BE_U_2(bp));
 785                                 }
 786                                 break;
 787
 788                         case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
 789                                 if (olen != 4) {
 790                                         ND_PRINT("[option length %u != 4]", olen);
 791                                         nd_print_invalid(ndo);
 792                                         return;
 793                                 } else {
 794                                         char t_bit;
 795                                         uint16_t lan_delay, override_interval;
 796                                         lan_delay = GET_BE_U_2(bp);
 797                                         override_interval = GET_BE_U_2(bp + 2);
 798                                         t_bit = (lan_delay & 0x8000)? 1 : 0;
 799                                         lan_delay &= ~0x8000;
 800                                         ND_PRINT("\n\t    T-bit=%u, LAN delay %ums, Override interval %ums",
 801                                         t_bit, lan_delay, override_interval);
 802                                 }
 803                                 break;
 804
 805                         case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
 806                         case PIMV2_HELLO_OPTION_DR_PRIORITY:
 807                                 switch (olen) {
 808                                 case 0:
 809                                         ND_PRINT("Bi-Directional Capability (Old)");
 810                                         break;
 811                                 case 4:
 812                                         ND_PRINT("%u", GET_BE_U_4(bp));
 813                                         break;
 814                                 default:
 815                                         ND_PRINT("[option length %u != 4]", olen);
 816                                         nd_print_invalid(ndo);
 817                                         return;
 818                                         break;
 819                                 }
 820                                 break;
 821
 822                         case PIMV2_HELLO_OPTION_GENID:
 823                                 if (olen != 4) {
 824                                         ND_PRINT("[option length %u != 4]", olen);
 825                                         nd_print_invalid(ndo);
 826                                         return;
 827                                 } else {
 828                                         ND_PRINT("0x%08x", GET_BE_U_4(bp));
 829                                 }
 830                                 break;
 831
 832                         case PIMV2_HELLO_OPTION_REFRESH_CAP:
 833                                 if (olen != 4) {
 834                                         ND_PRINT("[option length %u != 4]", olen);
 835                                         nd_print_invalid(ndo);
 836                                         return;
 837                                 } else {
 838                                         ND_PRINT("v%u", GET_U_1(bp));
 839                                         if (GET_U_1(bp + 1) != 0) {
 840                                                 ND_PRINT(", interval ");
 841                                                 unsigned_relts_print(ndo,
 842                                                                      GET_U_1(bp + 1));
 843                                         }
 844                                         if (GET_BE_U_2(bp + 2) != 0) {
 845                                                 ND_PRINT(" ?0x%04x?",
 846                                                          GET_BE_U_2(bp + 2));
 847                                         }
 848                                 }
 849                                 break;
 850
 851                         case  PIMV2_HELLO_OPTION_BIDIR_CAP:
 852                                 break;
 853
 854                         case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
 855                         case PIMV2_HELLO_OPTION_ADDRESS_LIST:
 856                                 if (ndo->ndo_vflag > 1) {
 857                                         const u_char *ptr = bp;
 858                                         u_int plen = len;
 859                                         while (ptr < (bp+olen)) {
 860                                                 ND_PRINT("\n\t    ");
 861                                                 advance = pimv2_addr_print(ndo, ptr, plen, pimv2_unicast, pimv2_addr_len, 0);
 862                                                 if (advance < 0)
 863                                                         goto trunc;
 864                                                 ptr += advance;
 865                                                 plen -= advance;
 866                                         }
 867                                 }
 868                                 break;
 869                         default:
 870                                 if (ndo->ndo_vflag <= 1)
 871                                         print_unknown_data(ndo, bp, "\n\t    ", olen);
 872                                 break;
 873                         }
 874                         /* do we want to see an additionally hexdump ? */
 875                         if (ndo->ndo_vflag> 1)
 876                                 print_unknown_data(ndo, bp, "\n\t    ", olen);
 877                         bp += olen;
 878                         len -= olen;
 879                 }
 880                 break;
 881             }
 882
 883         case PIMV2_TYPE_REGISTER:
 884         {
 885                 const struct ip *ip;
 886
 887                 if (len < 4)
 888                         goto trunc;
 889                 ND_TCHECK_LEN(bp, PIMV2_REGISTER_FLAG_LEN);
 890
 891                 ND_PRINT(", Flags [ %s ]\n\t",
 892                           tok2str(pimv2_register_flag_values,
 893                           "none",
 894                           GET_BE_U_4(bp)));
 895
 896                 bp += 4; len -= 4;
 897                 /* encapsulated multicast packet */
 898                 if (len == 0)
 899                         goto trunc;
 900                 ip = (const struct ip *)bp;
 901                 switch (IP_V(ip)) {
 902                 case 0: /* Null header */
 903                         ND_PRINT("IP-Null-header %s > %s",
 904                                   GET_IPADDR_STRING(ip->ip_src),
 905                                   GET_IPADDR_STRING(ip->ip_dst));
 906                         break;
 907
 908                 case 4: /* IPv4 */
 909                         ip_print(ndo, bp, len);
 910                         break;
 911
 912                 case 6: /* IPv6 */
 913                         ip6_print(ndo, bp, len);
 914                         break;
 915
 916                 default:
 917                         ND_PRINT("IP ver %u", IP_V(ip));
 918                         break;
 919                 }
 920                 break;
 921         }
 922
 923         case PIMV2_TYPE_REGISTER_STOP:
 924                 ND_PRINT(" group=");
 925                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
 926                         goto trunc;
 927                 bp += advance; len -= advance;
 928                 ND_PRINT(" source=");
 929                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
 930                         goto trunc;
 931                 bp += advance; len -= advance;
 932                 break;
 933
 934         case PIMV2_TYPE_JOIN_PRUNE:
 935         case PIMV2_TYPE_GRAFT:
 936         case PIMV2_TYPE_GRAFT_ACK:
 937
 938
 939         /*
 940          * 0                   1                   2                   3
 941          *   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
 942          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 943          *  |PIM Ver| Type  | Addr length   |           Checksum            |
 944          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 945          *  |             Unicast-Upstream Neighbor Address                 |
 946          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 947          *  |  Reserved     | Num groups    |          Holdtime             |
 948          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 949          *  |            Encoded-Multicast Group Address-1                  |
 950          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 951          *  |   Number of Joined  Sources   |   Number of Pruned Sources    |
 952          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 953          *  |               Encoded-Joined Source Address-1                 |
 954          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 955          *  |                             .                                 |
 956          *  |                             .                                 |
 957          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 958          *  |               Encoded-Joined Source Address-n                 |
 959          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 960          *  |               Encoded-Pruned Source Address-1                 |
 961          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 962          *  |                             .                                 |
 963          *  |                             .                                 |
 964          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 965          *  |               Encoded-Pruned Source Address-n                 |
 966          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 967          *  |                           .                                   |
 968          *  |                           .                                   |
 969          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 970          *  |                Encoded-Multicast Group Address-n              |
 971          *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 972          */
 973
 974             {
 975                 uint8_t ngroup;
 976                 uint16_t holdtime;
 977                 uint16_t njoin;
 978                 uint16_t nprune;
 979                 u_int i, j;
 980
 981                 if (PIM_TYPE(pim_typever) != 7) {       /*not for Graft-ACK*/
 982                         ND_PRINT(", upstream-neighbor: ");
 983                         if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
 984                                 goto trunc;
 985                         bp += advance; len -= advance;
 986                 }
 987                 if (len < 4)
 988                         goto trunc;
 989                 ND_TCHECK_4(bp);
 990                 ngroup = GET_U_1(bp + 1);
 991                 holdtime = GET_BE_U_2(bp + 2);
 992                 ND_PRINT("\n\t  %u group(s)", ngroup);
 993                 if (PIM_TYPE(pim_typever) != 7) {       /*not for Graft-ACK*/
 994                         ND_PRINT(", holdtime: ");
 995                         if (holdtime == 0xffff)
 996                                 ND_PRINT("infinite");
 997                         else
 998                                 unsigned_relts_print(ndo, holdtime);
 999                 }
1000                 bp += 4; len -= 4;
1001                 for (i = 0; i < ngroup; i++) {
1002                         ND_PRINT("\n\t    group #%u: ", i+1);
1003                         if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1004                                 goto trunc;
1005                         bp += advance; len -= advance;
1006                         if (len < 4)
1007                                 goto trunc;
1008                         ND_TCHECK_4(bp);
1009                         njoin = GET_BE_U_2(bp);
1010                         nprune = GET_BE_U_2(bp + 2);
1011                         ND_PRINT(", joined sources: %u, pruned sources: %u", njoin, nprune);
1012                         bp += 4; len -= 4;
1013                         for (j = 0; j < njoin; j++) {
1014                                 ND_PRINT("\n\t      joined source #%u: ", j+1);
1015                                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1016                                         goto trunc;
1017                                 bp += advance; len -= advance;
1018                         }
1019                         for (j = 0; j < nprune; j++) {
1020                                 ND_PRINT("\n\t      pruned source #%u: ", j+1);
1021                                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1022                                         goto trunc;
1023                                 bp += advance; len -= advance;
1024                         }
1025                 }
1026                 break;
1027             }
1028
1029         case PIMV2_TYPE_BOOTSTRAP:
1030         {
1031                 u_int i, j, frpcnt;
1032
1033                 /* Fragment Tag, Hash Mask len, and BSR-priority */
1034                 if (len < 2)
1035                         goto trunc;
1036                 ND_PRINT(" tag=%x", GET_BE_U_2(bp));
1037                 bp += 2;
1038                 len -= 2;
1039                 if (len < 1)
1040                         goto trunc;
1041                 ND_PRINT(" hashmlen=%u", GET_U_1(bp));
1042                 if (len < 2)
1043                         goto trunc;
1044                 ND_TCHECK_1(bp + 2);
1045                 ND_PRINT(" BSRprio=%u", GET_U_1(bp + 1));
1046                 bp += 2;
1047                 len -= 2;
1048
1049                 /* Encoded-Unicast-BSR-Address */
1050                 ND_PRINT(" BSR=");
1051                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1052                         goto trunc;
1053                 bp += advance;
1054                 len -= advance;
1055
1056                 for (i = 0; len > 0; i++) {
1057                         /* Encoded-Group Address */
1058                         ND_PRINT(" (group%u: ", i);
1059                         if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1060                                 goto trunc;
1061                         bp += advance;
1062                         len -= advance;
1063
1064                         /* RP-Count, Frag RP-Cnt, and rsvd */
1065                         if (len < 1)
1066                                 goto trunc;
1067                         ND_PRINT(" RPcnt=%u", GET_U_1(bp));
1068                         if (len < 2)
1069                                 goto trunc;
1070                         frpcnt = GET_U_1(bp + 1);
1071                         ND_PRINT(" FRPcnt=%u", frpcnt);
1072                         if (len < 4)
1073                                 goto trunc;
1074                         bp += 4;
1075                         len -= 4;
1076
1077                         for (j = 0; j < frpcnt && len > 0; j++) {
1078                                 /* each RP info */
1079                                 ND_PRINT(" RP%u=", j);
1080                                 if ((advance = pimv2_addr_print(ndo, bp, len,
1081                                                                 pimv2_unicast,
1082                                                                 pimv2_addr_len,
1083                                                                 0)) < 0)
1084                                         goto trunc;
1085                                 bp += advance;
1086                                 len -= advance;
1087
1088                                 if (len < 2)
1089                                         goto trunc;
1090                                 ND_PRINT(",holdtime=");
1091                                 unsigned_relts_print(ndo,
1092                                                      GET_BE_U_2(bp));
1093                                 if (len < 3)
1094                                         goto trunc;
1095                                 ND_PRINT(",prio=%u", GET_U_1(bp + 2));
1096                                 if (len < 4)
1097                                         goto trunc;
1098                                 bp += 4;
1099                                 len -= 4;
1100                         }
1101                         ND_PRINT(")");
1102                 }
1103                 break;
1104         }
1105         case PIMV2_TYPE_ASSERT:
1106                 ND_PRINT(" group=");
1107                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1108                         goto trunc;
1109                 bp += advance; len -= advance;
1110                 ND_PRINT(" src=");
1111                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1112                         goto trunc;
1113                 bp += advance; len -= advance;
1114                 if (len < 8)
1115                         goto trunc;
1116                 ND_TCHECK_8(bp);
1117                 if (GET_U_1(bp) & 0x80)
1118                         ND_PRINT(" RPT");
1119                 ND_PRINT(" pref=%u", GET_BE_U_4(bp) & 0x7fffffff);
1120                 ND_PRINT(" metric=%u", GET_BE_U_4(bp + 4));
1121                 break;
1122
1123         case PIMV2_TYPE_CANDIDATE_RP:
1124         {
1125                 u_int i, pfxcnt;
1126
1127                 /* Prefix-Cnt, Priority, and Holdtime */
1128                 if (len < 1)
1129                         goto trunc;
1130                 ND_PRINT(" prefix-cnt=%u", GET_U_1(bp));
1131                 pfxcnt = GET_U_1(bp);
1132                 if (len < 2)
1133                         goto trunc;
1134                 ND_PRINT(" prio=%u", GET_U_1(bp + 1));
1135                 if (len < 4)
1136                         goto trunc;
1137                 ND_PRINT(" holdtime=");
1138                 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
1139                 bp += 4;
1140                 len -= 4;
1141
1142                 /* Encoded-Unicast-RP-Address */
1143                 ND_PRINT(" RP=");
1144                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1145                         goto trunc;
1146                 bp += advance;
1147                 len -= advance;
1148
1149                 /* Encoded-Group Addresses */
1150                 for (i = 0; i < pfxcnt && len > 0; i++) {
1151                         ND_PRINT(" Group%u=", i);
1152                         if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1153                                 goto trunc;
1154                         bp += advance;
1155                         len -= advance;
1156                 }
1157                 break;
1158         }
1159
1160         case PIMV2_TYPE_PRUNE_REFRESH:
1161                 ND_PRINT(" src=");
1162                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1163                         goto trunc;
1164                 bp += advance;
1165                 len -= advance;
1166                 ND_PRINT(" grp=");
1167                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1168                         goto trunc;
1169                 bp += advance;
1170                 len -= advance;
1171                 ND_PRINT(" forwarder=");
1172                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1173                         goto trunc;
1174                 bp += advance;
1175                 len -= advance;
1176                 if (len < 2)
1177                         goto trunc;
1178                 ND_PRINT(" TUNR ");
1179                 unsigned_relts_print(ndo, GET_BE_U_2(bp));
1180                 break;
1181
1182         case PIMV2_TYPE_DF_ELECTION:
1183                 subtype = PIM_SUBTYPE(GET_U_1(pim->pim_rsv));
1184                 ND_PRINT("\n\t  %s,", tok2str( pimv2_df_election_flag_values,
1185                          "Unknown", subtype) );
1186
1187                 ND_PRINT(" rpa=");
1188                 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1189                         goto trunc;
1190                 }
1191                 bp += advance;
1192                 len -= advance;
1193                 ND_PRINT(" sender pref=%u", GET_BE_U_4(bp) );
1194                 ND_PRINT(" sender metric=%u", GET_BE_U_4(bp + 4));
1195
1196                 bp += 8;
1197                 len -= 8;
1198
1199                 switch (subtype) {
1200                 case PIMV2_DF_ELECTION_BACKOFF:
1201                 case PIMV2_DF_ELECTION_PASS:
1202                         ND_PRINT("\n\t  %s addr=", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype));
1203                         if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1204                                 goto trunc;
1205                         }
1206                         bp += advance;
1207                         len -= advance;
1208
1209                         ND_PRINT(" %s pref=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp) );
1210                         ND_PRINT(" %s metric=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp + 4));
1211
1212                         bp += 8;
1213                         len -= 8;
1214
1215                         if (subtype == PIMV2_DF_ELECTION_BACKOFF) {
1216                                 ND_PRINT(" interval %dms", GET_BE_U_2(bp));
1217                         }
1218
1219                         break;
1220                 default:
1221                         break;
1222                 }
1223                 break;
1224
1225          default:
1226                 ND_PRINT(" [type %u]", PIM_TYPE(pim_typever));
1227                 break;
1228         }
1229
1230         return;
1231
1232 trunc:
1233         nd_print_trunc(ndo);
1234 }