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 #include <config.h> 25 26 #include "netdissect-stdinc.h" 27 28 #include "netdissect.h" 29 #include "addrtoname.h" 30 #include "extract.h" 31 32 #include "ip.h" 33 #include "ip6.h" 34 #include "ipproto.h" 35 36 #define PIMV1_TYPE_QUERY 0 37 #define PIMV1_TYPE_REGISTER 1 38 #define PIMV1_TYPE_REGISTER_STOP 2 39 #define PIMV1_TYPE_JOIN_PRUNE 3 40 #define PIMV1_TYPE_RP_REACHABILITY 4 41 #define PIMV1_TYPE_ASSERT 5 42 #define PIMV1_TYPE_GRAFT 6 43 #define PIMV1_TYPE_GRAFT_ACK 7 44 45 static const struct tok pimv1_type_str[] = { 46 { PIMV1_TYPE_QUERY, "Query" }, 47 { PIMV1_TYPE_REGISTER, "Register" }, 48 { PIMV1_TYPE_REGISTER_STOP, "Register-Stop" }, 49 { PIMV1_TYPE_JOIN_PRUNE, "Join/Prune" }, 50 { PIMV1_TYPE_RP_REACHABILITY, "RP-reachable" }, 51 { PIMV1_TYPE_ASSERT, "Assert" }, 52 { PIMV1_TYPE_GRAFT, "Graft" }, 53 { PIMV1_TYPE_GRAFT_ACK, "Graft-ACK" }, 54 { 0, NULL } 55 }; 56 57 #define PIMV2_TYPE_HELLO 0 58 #define PIMV2_TYPE_REGISTER 1 59 #define PIMV2_TYPE_REGISTER_STOP 2 60 #define PIMV2_TYPE_JOIN_PRUNE 3 61 #define PIMV2_TYPE_BOOTSTRAP 4 62 #define PIMV2_TYPE_ASSERT 5 63 #define PIMV2_TYPE_GRAFT 6 64 #define PIMV2_TYPE_GRAFT_ACK 7 65 #define PIMV2_TYPE_CANDIDATE_RP 8 66 #define PIMV2_TYPE_PRUNE_REFRESH 9 67 #define PIMV2_TYPE_DF_ELECTION 10 68 #define PIMV2_TYPE_ECMP_REDIRECT 11 69 70 static const struct tok pimv2_type_values[] = { 71 { PIMV2_TYPE_HELLO, "Hello" }, 72 { PIMV2_TYPE_REGISTER, "Register" }, 73 { PIMV2_TYPE_REGISTER_STOP, "Register Stop" }, 74 { PIMV2_TYPE_JOIN_PRUNE, "Join / Prune" }, 75 { PIMV2_TYPE_BOOTSTRAP, "Bootstrap" }, 76 { PIMV2_TYPE_ASSERT, "Assert" }, 77 { PIMV2_TYPE_GRAFT, "Graft" }, 78 { PIMV2_TYPE_GRAFT_ACK, "Graft Acknowledgement" }, 79 { PIMV2_TYPE_CANDIDATE_RP, "Candidate RP Advertisement" }, 80 { PIMV2_TYPE_PRUNE_REFRESH, "Prune Refresh" }, 81 { PIMV2_TYPE_DF_ELECTION, "DF Election" }, 82 { PIMV2_TYPE_ECMP_REDIRECT, "ECMP Redirect" }, 83 { 0, NULL} 84 }; 85 86 #define PIMV2_HELLO_OPTION_HOLDTIME 1 87 #define PIMV2_HELLO_OPTION_LANPRUNEDELAY 2 88 #define PIMV2_HELLO_OPTION_DR_PRIORITY_OLD 18 89 #define PIMV2_HELLO_OPTION_DR_PRIORITY 19 90 #define PIMV2_HELLO_OPTION_GENID 20 91 #define PIMV2_HELLO_OPTION_REFRESH_CAP 21 92 #define PIMV2_HELLO_OPTION_BIDIR_CAP 22 93 #define PIMV2_HELLO_OPTION_ADDRESS_LIST 24 94 #define PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD 65001 95 96 static const struct tok pimv2_hello_option_values[] = { 97 { PIMV2_HELLO_OPTION_HOLDTIME, "Hold Time" }, 98 { PIMV2_HELLO_OPTION_LANPRUNEDELAY, "LAN Prune Delay" }, 99 { PIMV2_HELLO_OPTION_DR_PRIORITY_OLD, "DR Priority (Old)" }, 100 { PIMV2_HELLO_OPTION_DR_PRIORITY, "DR Priority" }, 101 { PIMV2_HELLO_OPTION_GENID, "Generation ID" }, 102 { PIMV2_HELLO_OPTION_REFRESH_CAP, "State Refresh Capability" }, 103 { PIMV2_HELLO_OPTION_BIDIR_CAP, "Bi-Directional Capability" }, 104 { PIMV2_HELLO_OPTION_ADDRESS_LIST, "Address List" }, 105 { PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD, "Address List (Old)" }, 106 { 0, NULL} 107 }; 108 109 #define PIMV2_REGISTER_FLAG_LEN 4 110 #define PIMV2_REGISTER_FLAG_BORDER 0x80000000 111 #define PIMV2_REGISTER_FLAG_NULL 0x40000000 112 113 static const struct tok pimv2_register_flag_values[] = { 114 { PIMV2_REGISTER_FLAG_BORDER, "Border" }, 115 { PIMV2_REGISTER_FLAG_NULL, "Null" }, 116 { 0, NULL} 117 }; 118 119 #define PIMV2_DF_ELECTION_OFFER 1 120 #define PIMV2_DF_ELECTION_WINNER 2 121 #define PIMV2_DF_ELECTION_BACKOFF 3 122 #define PIMV2_DF_ELECTION_PASS 4 123 124 static const struct tok pimv2_df_election_flag_values[] = { 125 { PIMV2_DF_ELECTION_OFFER, "Offer" }, 126 { PIMV2_DF_ELECTION_WINNER, "Winner" }, 127 { PIMV2_DF_ELECTION_BACKOFF, "Backoff" }, 128 { PIMV2_DF_ELECTION_PASS, "Pass" }, 129 { 0, NULL} 130 }; 131 132 #define PIMV2_DF_ELECTION_PASS_BACKOFF_STR(x) ( \ 133 x == PIMV2_DF_ELECTION_BACKOFF ? "offer" : "new winner" ) 134 135 136 /* 137 * XXX: We consider a case where IPv6 is not ready yet for portability, 138 * but PIM dependent definitions should be independent of IPv6... 139 */ 140 141 struct pim { 142 nd_uint8_t pim_typever; 143 /* upper 4bit: PIM version number; 2 for PIMv2 */ 144 /* lower 4bit: the PIM message type, currently they are: 145 * Hello, Register, Register-Stop, Join/Prune, 146 * Bootstrap, Assert, Graft (PIM-DM only), 147 * Graft-Ack (PIM-DM only), C-RP-Adv 148 */ 149 #define PIM_VER(x) (((x) & 0xf0) >> 4) 150 #define PIM_TYPE(x) ((x) & 0x0f) 151 nd_uint8_t pim_rsv; /* Reserved in v1, subtype+address length in v2 */ 152 #define PIM_SUBTYPE(x) (((x) & 0xf0) >> 4) 153 nd_uint16_t pim_cksum; /* IP style check sum */ 154 }; 155 156 static void pimv2_print(netdissect_options *, const u_char *bp, u_int len, const u_char *); 157 158 static void 159 pimv1_join_prune_print(netdissect_options *ndo, 160 const u_char *bp, u_int len) 161 { 162 u_int ngroups, njoin, nprune; 163 u_int njp; 164 165 /* If it's a single group and a single source, use 1-line output. */ 166 if (ND_TTEST_LEN(bp, 30) && GET_U_1(bp + 11) == 1 && 167 ((njoin = GET_BE_U_2(bp + 20)) + GET_BE_U_2(bp + 22)) == 1) { 168 u_int hold; 169 170 ND_PRINT(" RPF %s ", GET_IPADDR_STRING(bp)); 171 hold = GET_BE_U_2(bp + 6); 172 if (hold != 180) { 173 ND_PRINT("Hold "); 174 unsigned_relts_print(ndo, hold); 175 } 176 ND_PRINT("%s (%s/%u, %s", njoin ? "Join" : "Prune", 177 GET_IPADDR_STRING(bp + 26), GET_U_1(bp + 25) & 0x3f, 178 GET_IPADDR_STRING(bp + 12)); 179 if (GET_BE_U_4(bp + 16) != 0xffffffff) 180 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 16)); 181 ND_PRINT(") %s%s %s", 182 (GET_U_1(bp + 24) & 0x01) ? "Sparse" : "Dense", 183 (GET_U_1(bp + 25) & 0x80) ? " WC" : "", 184 (GET_U_1(bp + 25) & 0x40) ? "RP" : "SPT"); 185 return; 186 } 187 188 if (len < sizeof(nd_ipv4)) 189 goto trunc; 190 if (ndo->ndo_vflag > 1) 191 ND_PRINT("\n"); 192 ND_PRINT(" Upstream Nbr: %s", GET_IPADDR_STRING(bp)); 193 bp += 4; 194 len -= 4; 195 if (len < 4) 196 goto trunc; 197 if (ndo->ndo_vflag > 1) 198 ND_PRINT("\n"); 199 ND_PRINT(" Hold time: "); 200 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2)); 201 if (ndo->ndo_vflag < 2) 202 return; 203 bp += 4; 204 len -= 4; 205 206 if (len < 4) 207 goto trunc; 208 ngroups = GET_U_1(bp + 3); 209 bp += 4; 210 len -= 4; 211 while (ngroups != 0) { 212 /* 213 * XXX - does the address have length "addrlen" and the 214 * mask length "maddrlen"? 215 */ 216 if (len < 4) 217 goto trunc; 218 ND_PRINT("\n\tGroup: %s", GET_IPADDR_STRING(bp)); 219 bp += 4; 220 len -= 4; 221 if (len < 4) 222 goto trunc; 223 if (GET_BE_U_4(bp) != 0xffffffff) 224 ND_PRINT("/%s", GET_IPADDR_STRING(bp)); 225 bp += 4; 226 len -= 4; 227 if (len < 4) 228 goto trunc; 229 njoin = GET_BE_U_2(bp); 230 nprune = GET_BE_U_2(bp + 2); 231 ND_PRINT(" joined: %u pruned: %u", njoin, nprune); 232 bp += 4; 233 len -= 4; 234 for (njp = 0; njp < (njoin + nprune); njp++) { 235 const char *type; 236 237 if (njp < njoin) 238 type = "Join "; 239 else 240 type = "Prune"; 241 if (len < 6) 242 goto trunc; 243 ND_PRINT("\n\t%s %s%s%s%s/%u", type, 244 (GET_U_1(bp) & 0x01) ? "Sparse " : "Dense ", 245 (GET_U_1(bp + 1) & 0x80) ? "WC " : "", 246 (GET_U_1(bp + 1) & 0x40) ? "RP " : "SPT ", 247 GET_IPADDR_STRING(bp + 2), 248 GET_U_1(bp + 1) & 0x3f); 249 bp += 6; 250 len -= 6; 251 } 252 ngroups--; 253 } 254 return; 255 trunc: 256 nd_print_trunc(ndo); 257 } 258 259 void 260 pimv1_print(netdissect_options *ndo, 261 const u_char *bp, u_int len) 262 { 263 u_char type; 264 265 ndo->ndo_protocol = "pimv1"; 266 type = GET_U_1(bp + 1); 267 268 ND_PRINT(" %s", tok2str(pimv1_type_str, "[type %u]", type)); 269 switch (type) { 270 case PIMV1_TYPE_QUERY: 271 if (ND_TTEST_1(bp + 8)) { 272 switch (GET_U_1(bp + 8) >> 4) { 273 case 0: 274 ND_PRINT(" Dense-mode"); 275 break; 276 case 1: 277 ND_PRINT(" Sparse-mode"); 278 break; 279 case 2: 280 ND_PRINT(" Sparse-Dense-mode"); 281 break; 282 default: 283 ND_PRINT(" mode-%u", GET_U_1(bp + 8) >> 4); 284 break; 285 } 286 } 287 if (ndo->ndo_vflag) { 288 ND_PRINT(" (Hold-time "); 289 unsigned_relts_print(ndo, GET_BE_U_2(bp + 10)); 290 ND_PRINT(")"); 291 } 292 break; 293 294 case PIMV1_TYPE_REGISTER: 295 ND_TCHECK_LEN(bp + 8, 20); /* ip header */ 296 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 20), 297 GET_IPADDR_STRING(bp + 24)); 298 break; 299 case PIMV1_TYPE_REGISTER_STOP: 300 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 8), 301 GET_IPADDR_STRING(bp + 12)); 302 break; 303 case PIMV1_TYPE_RP_REACHABILITY: 304 if (ndo->ndo_vflag) { 305 ND_PRINT(" group %s", GET_IPADDR_STRING(bp + 8)); 306 if (GET_BE_U_4(bp + 12) != 0xffffffff) 307 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12)); 308 ND_PRINT(" RP %s hold ", GET_IPADDR_STRING(bp + 16)); 309 unsigned_relts_print(ndo, GET_BE_U_2(bp + 22)); 310 } 311 break; 312 case PIMV1_TYPE_ASSERT: 313 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 16), 314 GET_IPADDR_STRING(bp + 8)); 315 if (GET_BE_U_4(bp + 12) != 0xffffffff) 316 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12)); 317 ND_PRINT(" %s pref %u metric %u", 318 (GET_U_1(bp + 20) & 0x80) ? "RP-tree" : "SPT", 319 GET_BE_U_4(bp + 20) & 0x7fffffff, 320 GET_BE_U_4(bp + 24)); 321 break; 322 case PIMV1_TYPE_JOIN_PRUNE: 323 case PIMV1_TYPE_GRAFT: 324 case PIMV1_TYPE_GRAFT_ACK: 325 if (ndo->ndo_vflag) { 326 if (len < 8) 327 goto trunc; 328 pimv1_join_prune_print(ndo, bp + 8, len - 8); 329 } 330 break; 331 } 332 if ((GET_U_1(bp + 4) >> 4) != 1) 333 ND_PRINT(" [v%u]", GET_U_1(bp + 4) >> 4); 334 return; 335 336 trunc: 337 nd_print_trunc(ndo); 338 } 339 340 /* 341 * auto-RP is a cisco protocol, documented at 342 * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt 343 * 344 * This implements version 1+, dated Sept 9, 1998. 345 */ 346 void 347 cisco_autorp_print(netdissect_options *ndo, 348 const u_char *bp, u_int len) 349 { 350 u_int type; 351 u_int numrps; 352 u_int hold; 353 354 ndo->ndo_protocol = "cisco_autorp"; 355 if (len < 8) 356 goto trunc; 357 ND_PRINT(" auto-rp "); 358 type = GET_U_1(bp); 359 switch (type) { 360 case 0x11: 361 ND_PRINT("candidate-advert"); 362 break; 363 case 0x12: 364 ND_PRINT("mapping"); 365 break; 366 default: 367 ND_PRINT("type-0x%02x", type); 368 break; 369 } 370 371 numrps = GET_U_1(bp + 1); 372 373 ND_PRINT(" Hold "); 374 hold = GET_BE_U_2(bp + 2); 375 if (hold) 376 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2)); 377 else 378 ND_PRINT("FOREVER"); 379 380 /* Next 4 bytes are reserved. */ 381 382 bp += 8; len -= 8; 383 384 /*XXX skip unless -v? */ 385 386 /* 387 * Rest of packet: 388 * numrps entries of the form: 389 * 32 bits: RP 390 * 6 bits: reserved 391 * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2". 392 * 8 bits: # of entries for this RP 393 * each entry: 7 bits: reserved, 1 bit: negative, 394 * 8 bits: mask 32 bits: source 395 * lather, rinse, repeat. 396 */ 397 while (numrps != 0) { 398 u_int nentries; 399 char s; 400 401 if (len < 4) 402 goto trunc; 403 ND_PRINT(" RP %s", GET_IPADDR_STRING(bp)); 404 bp += 4; 405 len -= 4; 406 if (len < 1) 407 goto trunc; 408 switch (GET_U_1(bp) & 0x3) { 409 case 0: ND_PRINT(" PIMv?"); 410 break; 411 case 1: ND_PRINT(" PIMv1"); 412 break; 413 case 2: ND_PRINT(" PIMv2"); 414 break; 415 case 3: ND_PRINT(" PIMv1+2"); 416 break; 417 } 418 if (GET_U_1(bp) & 0xfc) 419 ND_PRINT(" [rsvd=0x%02x]", GET_U_1(bp) & 0xfc); 420 bp += 1; 421 len -= 1; 422 if (len < 1) 423 goto trunc; 424 nentries = GET_U_1(bp); 425 bp += 1; 426 len -= 1; 427 s = ' '; 428 while (nentries != 0) { 429 if (len < 6) 430 goto trunc; 431 ND_PRINT("%c%s%s/%u", s, GET_U_1(bp) & 1 ? "!" : "", 432 GET_IPADDR_STRING(bp + 2), GET_U_1(bp + 1)); 433 if (GET_U_1(bp) & 0x02) { 434 ND_PRINT(" bidir"); 435 } 436 if (GET_U_1(bp) & 0xfc) { 437 ND_PRINT("[rsvd=0x%02x]", GET_U_1(bp) & 0xfc); 438 } 439 s = ','; 440 bp += 6; len -= 6; 441 nentries--; 442 } 443 numrps--; 444 } 445 return; 446 447 trunc: 448 nd_print_trunc(ndo); 449 } 450 451 void 452 pim_print(netdissect_options *ndo, 453 const u_char *bp, u_int len, const u_char *bp2) 454 { 455 const struct pim *pim = (const struct pim *)bp; 456 uint8_t pim_typever; 457 458 ndo->ndo_protocol = "pim"; 459 460 pim_typever = GET_U_1(pim->pim_typever); 461 switch (PIM_VER(pim_typever)) { 462 case 2: 463 if (!ndo->ndo_vflag) { 464 ND_PRINT("PIMv%u, %s, length %u", 465 PIM_VER(pim_typever), 466 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)), 467 len); 468 return; 469 } else { 470 ND_PRINT("PIMv%u, length %u\n\t%s", 471 PIM_VER(pim_typever), 472 len, 473 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever))); 474 pimv2_print(ndo, bp, len, bp2); 475 } 476 break; 477 default: 478 ND_PRINT("PIMv%u, length %u", 479 PIM_VER(pim_typever), 480 len); 481 break; 482 } 483 } 484 485 /* 486 * PIMv2 uses encoded address representations. 487 * 488 * The last PIM-SM I-D before RFC2117 was published specified the 489 * following representation for unicast addresses. However, RFC2117 490 * specified no encoding for unicast addresses with the unicast 491 * address length specified in the header. Therefore, we have to 492 * guess which encoding is being used (Cisco's PIMv2 implementation 493 * uses the non-RFC encoding). RFC2117 turns a previously "Reserved" 494 * field into a 'unicast-address-length-in-bytes' field. We guess 495 * that it's the draft encoding if this reserved field is zero. 496 * 497 * RFC2362 goes back to the encoded format, and calls the addr length 498 * field "reserved" again. 499 * 500 * The first byte is the address family, from: 501 * 502 * 0 Reserved 503 * 1 IP (IP version 4) 504 * 2 IP6 (IP version 6) 505 * 3 NSAP 506 * 4 HDLC (8-bit multidrop) 507 * 5 BBN 1822 508 * 6 802 (includes all 802 media plus Ethernet "canonical format") 509 * 7 E.163 510 * 8 E.164 (SMDS, Frame Relay, ATM) 511 * 9 F.69 (Telex) 512 * 10 X.121 (X.25, Frame Relay) 513 * 11 IPX 514 * 12 Appletalk 515 * 13 Decnet IV 516 * 14 Banyan Vines 517 * 15 E.164 with NSAP format subaddress 518 * 519 * In addition, the second byte is an "Encoding". 0 is the default 520 * encoding for the address family, and no other encodings are currently 521 * specified. 522 * 523 */ 524 525 enum pimv2_addrtype { 526 pimv2_unicast, pimv2_group, pimv2_source 527 }; 528 529 /* 0 1 2 3 530 * 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 1 531 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 532 * | Addr Family | Encoding Type | Unicast Address | 533 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++ 534 * 0 1 2 3 535 * 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 1 536 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 537 * | Addr Family | Encoding Type | Reserved | Mask Len | 538 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 539 * | Group multicast Address | 540 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 541 * 0 1 2 3 542 * 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 1 543 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 544 * | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len | 545 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 546 * | Source Address | 547 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 548 */ 549 static int 550 pimv2_addr_print(netdissect_options *ndo, 551 const u_char *bp, u_int len, enum pimv2_addrtype at, 552 u_int addr_len, int silent) 553 { 554 u_int af; 555 int hdrlen; 556 557 if (addr_len == 0) { 558 if (len < 2) 559 goto trunc; 560 switch (GET_U_1(bp)) { 561 case 1: 562 af = AF_INET; 563 addr_len = (u_int)sizeof(nd_ipv4); 564 break; 565 case 2: 566 af = AF_INET6; 567 addr_len = (u_int)sizeof(nd_ipv6); 568 break; 569 default: 570 return -1; 571 } 572 if (GET_U_1(bp + 1) != 0) 573 return -1; 574 hdrlen = 2; 575 } else { 576 switch (addr_len) { 577 case sizeof(nd_ipv4): 578 af = AF_INET; 579 break; 580 case sizeof(nd_ipv6): 581 af = AF_INET6; 582 break; 583 default: 584 return -1; 585 break; 586 } 587 hdrlen = 0; 588 } 589 590 bp += hdrlen; 591 len -= hdrlen; 592 switch (at) { 593 case pimv2_unicast: 594 if (len < addr_len) 595 goto trunc; 596 ND_TCHECK_LEN(bp, addr_len); 597 if (af == AF_INET) { 598 if (!silent) 599 ND_PRINT("%s", GET_IPADDR_STRING(bp)); 600 } else if (af == AF_INET6) { 601 if (!silent) 602 ND_PRINT("%s", GET_IP6ADDR_STRING(bp)); 603 } 604 return hdrlen + addr_len; 605 case pimv2_group: 606 case pimv2_source: 607 if (len < addr_len + 2) 608 goto trunc; 609 ND_TCHECK_LEN(bp, addr_len + 2); 610 if (af == AF_INET) { 611 if (!silent) { 612 ND_PRINT("%s", GET_IPADDR_STRING(bp + 2)); 613 if (GET_U_1(bp + 1) != 32) 614 ND_PRINT("/%u", GET_U_1(bp + 1)); 615 } 616 } else if (af == AF_INET6) { 617 if (!silent) { 618 ND_PRINT("%s", GET_IP6ADDR_STRING(bp + 2)); 619 if (GET_U_1(bp + 1) != 128) 620 ND_PRINT("/%u", GET_U_1(bp + 1)); 621 } 622 } 623 if (GET_U_1(bp) && !silent) { 624 if (at == pimv2_group) { 625 ND_PRINT("(0x%02x)", GET_U_1(bp)); 626 } else { 627 ND_PRINT("(%s%s%s", 628 GET_U_1(bp) & 0x04 ? "S" : "", 629 GET_U_1(bp) & 0x02 ? "W" : "", 630 GET_U_1(bp) & 0x01 ? "R" : ""); 631 if (GET_U_1(bp) & 0xf8) { 632 ND_PRINT("+0x%02x", 633 GET_U_1(bp) & 0xf8); 634 } 635 ND_PRINT(")"); 636 } 637 } 638 return hdrlen + 2 + addr_len; 639 default: 640 return -1; 641 } 642 trunc: 643 return -1; 644 } 645 646 enum checksum_status { 647 CORRECT, 648 INCORRECT, 649 UNVERIFIED 650 }; 651 652 static enum checksum_status 653 pimv2_check_checksum(netdissect_options *ndo, const u_char *bp, 654 const u_char *bp2, u_int len) 655 { 656 const struct ip *ip; 657 u_int cksum; 658 659 if (!ND_TTEST_LEN(bp, len)) { 660 /* We don't have all the data. */ 661 return (UNVERIFIED); 662 } 663 ip = (const struct ip *)bp2; 664 if (IP_V(ip) == 4) { 665 struct cksum_vec vec[1]; 666 667 vec[0].ptr = bp; 668 vec[0].len = len; 669 cksum = in_cksum(vec, 1); 670 return (cksum ? INCORRECT : CORRECT); 671 } else if (IP_V(ip) == 6) { 672 const struct ip6_hdr *ip6; 673 674 ip6 = (const struct ip6_hdr *)bp2; 675 cksum = nextproto6_cksum(ndo, ip6, bp, len, len, IPPROTO_PIM); 676 return (cksum ? INCORRECT : CORRECT); 677 } else { 678 return (UNVERIFIED); 679 } 680 } 681 682 static void 683 pimv2_print(netdissect_options *ndo, 684 const u_char *bp, u_int len, const u_char *bp2) 685 { 686 const struct pim *pim = (const struct pim *)bp; 687 int advance; 688 int subtype; 689 enum checksum_status cksum_status; 690 u_int pim_typever; 691 u_int pimv2_addr_len; 692 693 ndo->ndo_protocol = "pimv2"; 694 if (len < 2) { 695 ND_PRINT("[length %u < 2]", len); 696 nd_print_invalid(ndo); 697 return; 698 } 699 pim_typever = GET_U_1(pim->pim_typever); 700 /* RFC5015 allocates the high 4 bits of pim_rsv for "subtype". */ 701 pimv2_addr_len = GET_U_1(pim->pim_rsv) & 0x0f; 702 if (pimv2_addr_len != 0) 703 ND_PRINT(", RFC2117-encoding"); 704 705 if (len < 4) { 706 ND_PRINT("[length %u < 4]", len); 707 nd_print_invalid(ndo); 708 return; 709 } 710 ND_PRINT(", cksum 0x%04x ", GET_BE_U_2(pim->pim_cksum)); 711 if (GET_BE_U_2(pim->pim_cksum) == 0) { 712 ND_PRINT("(unverified)"); 713 } else { 714 if (PIM_TYPE(pim_typever) == PIMV2_TYPE_REGISTER) { 715 /* 716 * The checksum only covers the packet header, 717 * not the encapsulated packet. 718 */ 719 cksum_status = pimv2_check_checksum(ndo, bp, bp2, 8); 720 if (cksum_status == INCORRECT) { 721 /* 722 * To quote RFC 4601, "For interoperability 723 * reasons, a message carrying a checksum 724 * calculated over the entire PIM Register 725 * message should also be accepted." 726 */ 727 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len); 728 } 729 } else { 730 /* 731 * The checksum covers the entire packet. 732 */ 733 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len); 734 } 735 switch (cksum_status) { 736 737 case CORRECT: 738 ND_PRINT("(correct)"); 739 break; 740 741 case INCORRECT: 742 ND_PRINT("(incorrect)"); 743 break; 744 745 case UNVERIFIED: 746 ND_PRINT("(unverified)"); 747 break; 748 } 749 } 750 bp += 4; 751 len -= 4; 752 753 switch (PIM_TYPE(pim_typever)) { 754 case PIMV2_TYPE_HELLO: 755 { 756 uint16_t otype, olen; 757 while (len > 0) { 758 if (len < 4) 759 goto trunc; 760 otype = GET_BE_U_2(bp); 761 olen = GET_BE_U_2(bp + 2); 762 ND_PRINT("\n\t %s Option (%u), length %u, Value: ", 763 tok2str(pimv2_hello_option_values, "Unknown", otype), 764 otype, 765 olen); 766 bp += 4; 767 len -= 4; 768 769 if (len < olen) 770 goto trunc; 771 ND_TCHECK_LEN(bp, olen); 772 switch (otype) { 773 case PIMV2_HELLO_OPTION_HOLDTIME: 774 if (olen != 2) { 775 ND_PRINT("[option length %u != 2]", olen); 776 nd_print_invalid(ndo); 777 return; 778 } else { 779 unsigned_relts_print(ndo, 780 GET_BE_U_2(bp)); 781 } 782 break; 783 784 case PIMV2_HELLO_OPTION_LANPRUNEDELAY: 785 if (olen != 4) { 786 ND_PRINT("[option length %u != 4]", olen); 787 nd_print_invalid(ndo); 788 return; 789 } else { 790 char t_bit; 791 uint16_t lan_delay, override_interval; 792 lan_delay = GET_BE_U_2(bp); 793 override_interval = GET_BE_U_2(bp + 2); 794 t_bit = (lan_delay & 0x8000)? 1 : 0; 795 lan_delay &= ~0x8000; 796 ND_PRINT("\n\t T-bit=%u, LAN delay %ums, Override interval %ums", 797 t_bit, lan_delay, override_interval); 798 } 799 break; 800 801 case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD: 802 case PIMV2_HELLO_OPTION_DR_PRIORITY: 803 switch (olen) { 804 case 0: 805 ND_PRINT("Bi-Directional Capability (Old)"); 806 break; 807 case 4: 808 ND_PRINT("%u", GET_BE_U_4(bp)); 809 break; 810 default: 811 ND_PRINT("[option length %u != 4]", olen); 812 nd_print_invalid(ndo); 813 return; 814 break; 815 } 816 break; 817 818 case PIMV2_HELLO_OPTION_GENID: 819 if (olen != 4) { 820 ND_PRINT("[option length %u != 4]", olen); 821 nd_print_invalid(ndo); 822 return; 823 } else { 824 ND_PRINT("0x%08x", GET_BE_U_4(bp)); 825 } 826 break; 827 828 case PIMV2_HELLO_OPTION_REFRESH_CAP: 829 if (olen != 4) { 830 ND_PRINT("[option length %u != 4]", olen); 831 nd_print_invalid(ndo); 832 return; 833 } else { 834 ND_PRINT("v%u", GET_U_1(bp)); 835 if (GET_U_1(bp + 1) != 0) { 836 ND_PRINT(", interval "); 837 unsigned_relts_print(ndo, 838 GET_U_1(bp + 1)); 839 } 840 if (GET_BE_U_2(bp + 2) != 0) { 841 ND_PRINT(" ?0x%04x?", 842 GET_BE_U_2(bp + 2)); 843 } 844 } 845 break; 846 847 case PIMV2_HELLO_OPTION_BIDIR_CAP: 848 break; 849 850 case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD: 851 case PIMV2_HELLO_OPTION_ADDRESS_LIST: 852 if (ndo->ndo_vflag > 1) { 853 const u_char *ptr = bp; 854 u_int plen = len; 855 while (ptr < (bp+olen)) { 856 ND_PRINT("\n\t "); 857 advance = pimv2_addr_print(ndo, ptr, plen, pimv2_unicast, pimv2_addr_len, 0); 858 if (advance < 0) 859 goto trunc; 860 ptr += advance; 861 plen -= advance; 862 } 863 } 864 break; 865 default: 866 if (ndo->ndo_vflag <= 1) 867 print_unknown_data(ndo, bp, "\n\t ", olen); 868 break; 869 } 870 /* do we want to see an additionally hexdump ? */ 871 if (ndo->ndo_vflag> 1) 872 print_unknown_data(ndo, bp, "\n\t ", olen); 873 bp += olen; 874 len -= olen; 875 } 876 break; 877 } 878 879 case PIMV2_TYPE_REGISTER: 880 { 881 const struct ip *ip; 882 883 if (len < 4) 884 goto trunc; 885 ND_TCHECK_LEN(bp, PIMV2_REGISTER_FLAG_LEN); 886 887 ND_PRINT(", Flags [ %s ]\n\t", 888 tok2str(pimv2_register_flag_values, 889 "none", 890 GET_BE_U_4(bp))); 891 892 bp += 4; len -= 4; 893 /* encapsulated multicast packet */ 894 if (len == 0) 895 goto trunc; 896 ip = (const struct ip *)bp; 897 switch (IP_V(ip)) { 898 case 0: /* Null header */ 899 ND_PRINT("IP-Null-header %s > %s", 900 GET_IPADDR_STRING(ip->ip_src), 901 GET_IPADDR_STRING(ip->ip_dst)); 902 break; 903 904 case 4: /* IPv4 */ 905 ip_print(ndo, bp, len); 906 break; 907 908 case 6: /* IPv6 */ 909 ip6_print(ndo, bp, len); 910 break; 911 912 default: 913 ND_PRINT("IP ver %u", IP_V(ip)); 914 break; 915 } 916 break; 917 } 918 919 case PIMV2_TYPE_REGISTER_STOP: 920 ND_PRINT(" group="); 921 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0) 922 goto trunc; 923 bp += advance; len -= advance; 924 ND_PRINT(" source="); 925 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) 926 goto trunc; 927 bp += advance; len -= advance; 928 break; 929 930 case PIMV2_TYPE_JOIN_PRUNE: 931 case PIMV2_TYPE_GRAFT: 932 case PIMV2_TYPE_GRAFT_ACK: 933 934 935 /* 936 * 0 1 2 3 937 * 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 1 938 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 939 * |PIM Ver| Type | Addr length | Checksum | 940 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 941 * | Unicast-Upstream Neighbor Address | 942 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 943 * | Reserved | Num groups | Holdtime | 944 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 945 * | Encoded-Multicast Group Address-1 | 946 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 947 * | Number of Joined Sources | Number of Pruned Sources | 948 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 949 * | Encoded-Joined Source Address-1 | 950 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 951 * | . | 952 * | . | 953 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 954 * | Encoded-Joined Source Address-n | 955 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 956 * | Encoded-Pruned Source Address-1 | 957 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 958 * | . | 959 * | . | 960 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 961 * | Encoded-Pruned Source Address-n | 962 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 963 * | . | 964 * | . | 965 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 966 * | Encoded-Multicast Group Address-n | 967 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 968 */ 969 970 { 971 uint8_t ngroup; 972 uint16_t holdtime; 973 uint16_t njoin; 974 uint16_t nprune; 975 u_int i, j; 976 977 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/ 978 ND_PRINT(", upstream-neighbor: "); 979 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) 980 goto trunc; 981 bp += advance; len -= advance; 982 } 983 if (len < 4) 984 goto trunc; 985 ND_TCHECK_4(bp); 986 ngroup = GET_U_1(bp + 1); 987 holdtime = GET_BE_U_2(bp + 2); 988 ND_PRINT("\n\t %u group(s)", ngroup); 989 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/ 990 ND_PRINT(", holdtime: "); 991 if (holdtime == 0xffff) 992 ND_PRINT("infinite"); 993 else 994 unsigned_relts_print(ndo, holdtime); 995 } 996 bp += 4; len -= 4; 997 for (i = 0; i < ngroup; i++) { 998 ND_PRINT("\n\t group #%u: ", i+1); 999 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0) 1000 goto trunc; 1001 bp += advance; len -= advance; 1002 if (len < 4) 1003 goto trunc; 1004 ND_TCHECK_4(bp); 1005 njoin = GET_BE_U_2(bp); 1006 nprune = GET_BE_U_2(bp + 2); 1007 ND_PRINT(", joined sources: %u, pruned sources: %u", njoin, nprune); 1008 bp += 4; len -= 4; 1009 for (j = 0; j < njoin; j++) { 1010 ND_PRINT("\n\t joined source #%u: ", j+1); 1011 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0) 1012 goto trunc; 1013 bp += advance; len -= advance; 1014 } 1015 for (j = 0; j < nprune; j++) { 1016 ND_PRINT("\n\t pruned source #%u: ", j+1); 1017 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0) 1018 goto trunc; 1019 bp += advance; len -= advance; 1020 } 1021 } 1022 break; 1023 } 1024 1025 case PIMV2_TYPE_BOOTSTRAP: 1026 { 1027 u_int i, j, frpcnt; 1028 1029 /* Fragment Tag, Hash Mask len, and BSR-priority */ 1030 if (len < 2) 1031 goto trunc; 1032 ND_PRINT(" tag=%x", GET_BE_U_2(bp)); 1033 bp += 2; 1034 len -= 2; 1035 if (len < 1) 1036 goto trunc; 1037 ND_PRINT(" hashmlen=%u", GET_U_1(bp)); 1038 if (len < 2) 1039 goto trunc; 1040 ND_TCHECK_1(bp + 2); 1041 ND_PRINT(" BSRprio=%u", GET_U_1(bp + 1)); 1042 bp += 2; 1043 len -= 2; 1044 1045 /* Encoded-Unicast-BSR-Address */ 1046 ND_PRINT(" BSR="); 1047 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) 1048 goto trunc; 1049 bp += advance; 1050 len -= advance; 1051 1052 for (i = 0; len > 0; i++) { 1053 /* Encoded-Group Address */ 1054 ND_PRINT(" (group%u: ", i); 1055 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0) 1056 goto trunc; 1057 bp += advance; 1058 len -= advance; 1059 1060 /* RP-Count, Frag RP-Cnt, and rsvd */ 1061 if (len < 1) 1062 goto trunc; 1063 ND_PRINT(" RPcnt=%u", GET_U_1(bp)); 1064 if (len < 2) 1065 goto trunc; 1066 frpcnt = GET_U_1(bp + 1); 1067 ND_PRINT(" FRPcnt=%u", frpcnt); 1068 if (len < 4) 1069 goto trunc; 1070 bp += 4; 1071 len -= 4; 1072 1073 for (j = 0; j < frpcnt && len > 0; j++) { 1074 /* each RP info */ 1075 ND_PRINT(" RP%u=", j); 1076 if ((advance = pimv2_addr_print(ndo, bp, len, 1077 pimv2_unicast, 1078 pimv2_addr_len, 1079 0)) < 0) 1080 goto trunc; 1081 bp += advance; 1082 len -= advance; 1083 1084 if (len < 2) 1085 goto trunc; 1086 ND_PRINT(",holdtime="); 1087 unsigned_relts_print(ndo, 1088 GET_BE_U_2(bp)); 1089 if (len < 3) 1090 goto trunc; 1091 ND_PRINT(",prio=%u", GET_U_1(bp + 2)); 1092 if (len < 4) 1093 goto trunc; 1094 bp += 4; 1095 len -= 4; 1096 } 1097 ND_PRINT(")"); 1098 } 1099 break; 1100 } 1101 case PIMV2_TYPE_ASSERT: 1102 ND_PRINT(" group="); 1103 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0) 1104 goto trunc; 1105 bp += advance; len -= advance; 1106 ND_PRINT(" src="); 1107 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) 1108 goto trunc; 1109 bp += advance; len -= advance; 1110 if (len < 8) 1111 goto trunc; 1112 ND_TCHECK_8(bp); 1113 if (GET_U_1(bp) & 0x80) 1114 ND_PRINT(" RPT"); 1115 ND_PRINT(" pref=%u", GET_BE_U_4(bp) & 0x7fffffff); 1116 ND_PRINT(" metric=%u", GET_BE_U_4(bp + 4)); 1117 break; 1118 1119 case PIMV2_TYPE_CANDIDATE_RP: 1120 { 1121 u_int i, pfxcnt; 1122 1123 /* Prefix-Cnt, Priority, and Holdtime */ 1124 if (len < 1) 1125 goto trunc; 1126 ND_PRINT(" prefix-cnt=%u", GET_U_1(bp)); 1127 pfxcnt = GET_U_1(bp); 1128 if (len < 2) 1129 goto trunc; 1130 ND_PRINT(" prio=%u", GET_U_1(bp + 1)); 1131 if (len < 4) 1132 goto trunc; 1133 ND_PRINT(" holdtime="); 1134 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2)); 1135 bp += 4; 1136 len -= 4; 1137 1138 /* Encoded-Unicast-RP-Address */ 1139 ND_PRINT(" RP="); 1140 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) 1141 goto trunc; 1142 bp += advance; 1143 len -= advance; 1144 1145 /* Encoded-Group Addresses */ 1146 for (i = 0; i < pfxcnt && len > 0; i++) { 1147 ND_PRINT(" Group%u=", i); 1148 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0) 1149 goto trunc; 1150 bp += advance; 1151 len -= advance; 1152 } 1153 break; 1154 } 1155 1156 case PIMV2_TYPE_PRUNE_REFRESH: 1157 ND_PRINT(" src="); 1158 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) 1159 goto trunc; 1160 bp += advance; 1161 len -= advance; 1162 ND_PRINT(" grp="); 1163 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0) 1164 goto trunc; 1165 bp += advance; 1166 len -= advance; 1167 ND_PRINT(" forwarder="); 1168 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) 1169 goto trunc; 1170 bp += advance; 1171 len -= advance; 1172 if (len < 2) 1173 goto trunc; 1174 ND_PRINT(" TUNR "); 1175 unsigned_relts_print(ndo, GET_BE_U_2(bp)); 1176 break; 1177 1178 case PIMV2_TYPE_DF_ELECTION: 1179 subtype = PIM_SUBTYPE(GET_U_1(pim->pim_rsv)); 1180 ND_PRINT("\n\t %s,", tok2str( pimv2_df_election_flag_values, 1181 "Unknown", subtype) ); 1182 1183 ND_PRINT(" rpa="); 1184 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) { 1185 goto trunc; 1186 } 1187 bp += advance; 1188 len -= advance; 1189 ND_PRINT(" sender pref=%u", GET_BE_U_4(bp) ); 1190 ND_PRINT(" sender metric=%u", GET_BE_U_4(bp + 4)); 1191 1192 bp += 8; 1193 len -= 8; 1194 1195 switch (subtype) { 1196 case PIMV2_DF_ELECTION_BACKOFF: 1197 case PIMV2_DF_ELECTION_PASS: 1198 ND_PRINT("\n\t %s addr=", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype)); 1199 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) { 1200 goto trunc; 1201 } 1202 bp += advance; 1203 len -= advance; 1204 1205 ND_PRINT(" %s pref=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp) ); 1206 ND_PRINT(" %s metric=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp + 4)); 1207 1208 bp += 8; 1209 len -= 8; 1210 1211 if (subtype == PIMV2_DF_ELECTION_BACKOFF) { 1212 ND_PRINT(" interval %dms", GET_BE_U_2(bp)); 1213 } 1214 1215 break; 1216 default: 1217 break; 1218 } 1219 break; 1220 1221 default: 1222 ND_PRINT(" [type %u]", PIM_TYPE(pim_typever)); 1223 break; 1224 } 1225 1226 return; 1227 1228 trunc: 1229 nd_print_trunc(ndo); 1230 } 1231