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 47static 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 72static 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 98static 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 115static 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 126static 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 143struct 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 158static void pimv2_print(netdissect_options *, const u_char *bp, u_int len, const u_char *); 159 160static void 161pimv1_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; 257trunc: 258 nd_print_trunc(ndo); 259} 260 261void 262pimv1_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 338trunc: 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 */ 348void 349cisco_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 449trunc: 450 nd_print_trunc(ndo); 451} 452 453void 454pim_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 527enum 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 */ 551static int 552pimv2_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 } 646trunc: 647 return -1; 648} 649 650enum checksum_status { 651 CORRECT, 652 INCORRECT, 653 UNVERIFIED 654}; 655 656static enum checksum_status 657pimv2_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 686static void 687pimv2_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 1232trunc: 1233 nd_print_trunc(ndo); 1234} 1235