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-rw-r--r--print-pim.c1234
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diff --git a/print-pim.c b/print-pim.c
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+++ b/print-pim.c
@@ -0,0 +1,1234 @@
+/*
+ * Copyright (c) 1995, 1996
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+ * the University nor the names of its contributors may be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+/* \summary: Protocol Independent Multicast (PIM) printer */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#include "netdissect.h"
+#include "addrtoname.h"
+#include "extract.h"
+
+#include "ip.h"
+#include "ip6.h"
+#include "ipproto.h"
+
+#define PIMV1_TYPE_QUERY 0
+#define PIMV1_TYPE_REGISTER 1
+#define PIMV1_TYPE_REGISTER_STOP 2
+#define PIMV1_TYPE_JOIN_PRUNE 3
+#define PIMV1_TYPE_RP_REACHABILITY 4
+#define PIMV1_TYPE_ASSERT 5
+#define PIMV1_TYPE_GRAFT 6
+#define PIMV1_TYPE_GRAFT_ACK 7
+
+static const struct tok pimv1_type_str[] = {
+ { PIMV1_TYPE_QUERY, "Query" },
+ { PIMV1_TYPE_REGISTER, "Register" },
+ { PIMV1_TYPE_REGISTER_STOP, "Register-Stop" },
+ { PIMV1_TYPE_JOIN_PRUNE, "Join/Prune" },
+ { PIMV1_TYPE_RP_REACHABILITY, "RP-reachable" },
+ { PIMV1_TYPE_ASSERT, "Assert" },
+ { PIMV1_TYPE_GRAFT, "Graft" },
+ { PIMV1_TYPE_GRAFT_ACK, "Graft-ACK" },
+ { 0, NULL }
+};
+
+#define PIMV2_TYPE_HELLO 0
+#define PIMV2_TYPE_REGISTER 1
+#define PIMV2_TYPE_REGISTER_STOP 2
+#define PIMV2_TYPE_JOIN_PRUNE 3
+#define PIMV2_TYPE_BOOTSTRAP 4
+#define PIMV2_TYPE_ASSERT 5
+#define PIMV2_TYPE_GRAFT 6
+#define PIMV2_TYPE_GRAFT_ACK 7
+#define PIMV2_TYPE_CANDIDATE_RP 8
+#define PIMV2_TYPE_PRUNE_REFRESH 9
+#define PIMV2_TYPE_DF_ELECTION 10
+#define PIMV2_TYPE_ECMP_REDIRECT 11
+
+static const struct tok pimv2_type_values[] = {
+ { PIMV2_TYPE_HELLO, "Hello" },
+ { PIMV2_TYPE_REGISTER, "Register" },
+ { PIMV2_TYPE_REGISTER_STOP, "Register Stop" },
+ { PIMV2_TYPE_JOIN_PRUNE, "Join / Prune" },
+ { PIMV2_TYPE_BOOTSTRAP, "Bootstrap" },
+ { PIMV2_TYPE_ASSERT, "Assert" },
+ { PIMV2_TYPE_GRAFT, "Graft" },
+ { PIMV2_TYPE_GRAFT_ACK, "Graft Acknowledgement" },
+ { PIMV2_TYPE_CANDIDATE_RP, "Candidate RP Advertisement" },
+ { PIMV2_TYPE_PRUNE_REFRESH, "Prune Refresh" },
+ { PIMV2_TYPE_DF_ELECTION, "DF Election" },
+ { PIMV2_TYPE_ECMP_REDIRECT, "ECMP Redirect" },
+ { 0, NULL}
+};
+
+#define PIMV2_HELLO_OPTION_HOLDTIME 1
+#define PIMV2_HELLO_OPTION_LANPRUNEDELAY 2
+#define PIMV2_HELLO_OPTION_DR_PRIORITY_OLD 18
+#define PIMV2_HELLO_OPTION_DR_PRIORITY 19
+#define PIMV2_HELLO_OPTION_GENID 20
+#define PIMV2_HELLO_OPTION_REFRESH_CAP 21
+#define PIMV2_HELLO_OPTION_BIDIR_CAP 22
+#define PIMV2_HELLO_OPTION_ADDRESS_LIST 24
+#define PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD 65001
+
+static const struct tok pimv2_hello_option_values[] = {
+ { PIMV2_HELLO_OPTION_HOLDTIME, "Hold Time" },
+ { PIMV2_HELLO_OPTION_LANPRUNEDELAY, "LAN Prune Delay" },
+ { PIMV2_HELLO_OPTION_DR_PRIORITY_OLD, "DR Priority (Old)" },
+ { PIMV2_HELLO_OPTION_DR_PRIORITY, "DR Priority" },
+ { PIMV2_HELLO_OPTION_GENID, "Generation ID" },
+ { PIMV2_HELLO_OPTION_REFRESH_CAP, "State Refresh Capability" },
+ { PIMV2_HELLO_OPTION_BIDIR_CAP, "Bi-Directional Capability" },
+ { PIMV2_HELLO_OPTION_ADDRESS_LIST, "Address List" },
+ { PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD, "Address List (Old)" },
+ { 0, NULL}
+};
+
+#define PIMV2_REGISTER_FLAG_LEN 4
+#define PIMV2_REGISTER_FLAG_BORDER 0x80000000
+#define PIMV2_REGISTER_FLAG_NULL 0x40000000
+
+static const struct tok pimv2_register_flag_values[] = {
+ { PIMV2_REGISTER_FLAG_BORDER, "Border" },
+ { PIMV2_REGISTER_FLAG_NULL, "Null" },
+ { 0, NULL}
+};
+
+#define PIMV2_DF_ELECTION_OFFER 1
+#define PIMV2_DF_ELECTION_WINNER 2
+#define PIMV2_DF_ELECTION_BACKOFF 3
+#define PIMV2_DF_ELECTION_PASS 4
+
+static const struct tok pimv2_df_election_flag_values[] = {
+ { PIMV2_DF_ELECTION_OFFER, "Offer" },
+ { PIMV2_DF_ELECTION_WINNER, "Winner" },
+ { PIMV2_DF_ELECTION_BACKOFF, "Backoff" },
+ { PIMV2_DF_ELECTION_PASS, "Pass" },
+ { 0, NULL}
+};
+
+#define PIMV2_DF_ELECTION_PASS_BACKOFF_STR(x) ( \
+ x == PIMV2_DF_ELECTION_BACKOFF ? "offer" : "new winner" )
+
+
+/*
+ * XXX: We consider a case where IPv6 is not ready yet for portability,
+ * but PIM dependent definitions should be independent of IPv6...
+ */
+
+struct pim {
+ nd_uint8_t pim_typever;
+ /* upper 4bit: PIM version number; 2 for PIMv2 */
+ /* lower 4bit: the PIM message type, currently they are:
+ * Hello, Register, Register-Stop, Join/Prune,
+ * Bootstrap, Assert, Graft (PIM-DM only),
+ * Graft-Ack (PIM-DM only), C-RP-Adv
+ */
+#define PIM_VER(x) (((x) & 0xf0) >> 4)
+#define PIM_TYPE(x) ((x) & 0x0f)
+ nd_uint8_t pim_rsv; /* Reserved in v1, subtype+address length in v2 */
+#define PIM_SUBTYPE(x) (((x) & 0xf0) >> 4)
+ nd_uint16_t pim_cksum; /* IP style check sum */
+};
+
+static void pimv2_print(netdissect_options *, const u_char *bp, u_int len, const u_char *);
+
+static void
+pimv1_join_prune_print(netdissect_options *ndo,
+ const u_char *bp, u_int len)
+{
+ u_int ngroups, njoin, nprune;
+ u_int njp;
+
+ /* If it's a single group and a single source, use 1-line output. */
+ if (ND_TTEST_LEN(bp, 30) && GET_U_1(bp + 11) == 1 &&
+ ((njoin = GET_BE_U_2(bp + 20)) + GET_BE_U_2(bp + 22)) == 1) {
+ u_int hold;
+
+ ND_PRINT(" RPF %s ", GET_IPADDR_STRING(bp));
+ hold = GET_BE_U_2(bp + 6);
+ if (hold != 180) {
+ ND_PRINT("Hold ");
+ unsigned_relts_print(ndo, hold);
+ }
+ ND_PRINT("%s (%s/%u, %s", njoin ? "Join" : "Prune",
+ GET_IPADDR_STRING(bp + 26), GET_U_1(bp + 25) & 0x3f,
+ GET_IPADDR_STRING(bp + 12));
+ if (GET_BE_U_4(bp + 16) != 0xffffffff)
+ ND_PRINT("/%s", GET_IPADDR_STRING(bp + 16));
+ ND_PRINT(") %s%s %s",
+ (GET_U_1(bp + 24) & 0x01) ? "Sparse" : "Dense",
+ (GET_U_1(bp + 25) & 0x80) ? " WC" : "",
+ (GET_U_1(bp + 25) & 0x40) ? "RP" : "SPT");
+ return;
+ }
+
+ if (len < sizeof(nd_ipv4))
+ goto trunc;
+ if (ndo->ndo_vflag > 1)
+ ND_PRINT("\n");
+ ND_PRINT(" Upstream Nbr: %s", GET_IPADDR_STRING(bp));
+ bp += 4;
+ len -= 4;
+ if (len < 4)
+ goto trunc;
+ if (ndo->ndo_vflag > 1)
+ ND_PRINT("\n");
+ ND_PRINT(" Hold time: ");
+ unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
+ if (ndo->ndo_vflag < 2)
+ return;
+ bp += 4;
+ len -= 4;
+
+ if (len < 4)
+ goto trunc;
+ ngroups = GET_U_1(bp + 3);
+ bp += 4;
+ len -= 4;
+ while (ngroups != 0) {
+ /*
+ * XXX - does the address have length "addrlen" and the
+ * mask length "maddrlen"?
+ */
+ if (len < 4)
+ goto trunc;
+ ND_PRINT("\n\tGroup: %s", GET_IPADDR_STRING(bp));
+ bp += 4;
+ len -= 4;
+ if (len < 4)
+ goto trunc;
+ if (GET_BE_U_4(bp) != 0xffffffff)
+ ND_PRINT("/%s", GET_IPADDR_STRING(bp));
+ bp += 4;
+ len -= 4;
+ if (len < 4)
+ goto trunc;
+ njoin = GET_BE_U_2(bp);
+ nprune = GET_BE_U_2(bp + 2);
+ ND_PRINT(" joined: %u pruned: %u", njoin, nprune);
+ bp += 4;
+ len -= 4;
+ for (njp = 0; njp < (njoin + nprune); njp++) {
+ const char *type;
+
+ if (njp < njoin)
+ type = "Join ";
+ else
+ type = "Prune";
+ if (len < 6)
+ goto trunc;
+ ND_PRINT("\n\t%s %s%s%s%s/%u", type,
+ (GET_U_1(bp) & 0x01) ? "Sparse " : "Dense ",
+ (GET_U_1(bp + 1) & 0x80) ? "WC " : "",
+ (GET_U_1(bp + 1) & 0x40) ? "RP " : "SPT ",
+ GET_IPADDR_STRING(bp + 2),
+ GET_U_1(bp + 1) & 0x3f);
+ bp += 6;
+ len -= 6;
+ }
+ ngroups--;
+ }
+ return;
+trunc:
+ nd_print_trunc(ndo);
+}
+
+void
+pimv1_print(netdissect_options *ndo,
+ const u_char *bp, u_int len)
+{
+ u_char type;
+
+ ndo->ndo_protocol = "pimv1";
+ type = GET_U_1(bp + 1);
+
+ ND_PRINT(" %s", tok2str(pimv1_type_str, "[type %u]", type));
+ switch (type) {
+ case PIMV1_TYPE_QUERY:
+ if (ND_TTEST_1(bp + 8)) {
+ switch (GET_U_1(bp + 8) >> 4) {
+ case 0:
+ ND_PRINT(" Dense-mode");
+ break;
+ case 1:
+ ND_PRINT(" Sparse-mode");
+ break;
+ case 2:
+ ND_PRINT(" Sparse-Dense-mode");
+ break;
+ default:
+ ND_PRINT(" mode-%u", GET_U_1(bp + 8) >> 4);
+ break;
+ }
+ }
+ if (ndo->ndo_vflag) {
+ ND_PRINT(" (Hold-time ");
+ unsigned_relts_print(ndo, GET_BE_U_2(bp + 10));
+ ND_PRINT(")");
+ }
+ break;
+
+ case PIMV1_TYPE_REGISTER:
+ ND_TCHECK_LEN(bp + 8, 20); /* ip header */
+ ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 20),
+ GET_IPADDR_STRING(bp + 24));
+ break;
+ case PIMV1_TYPE_REGISTER_STOP:
+ ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 8),
+ GET_IPADDR_STRING(bp + 12));
+ break;
+ case PIMV1_TYPE_RP_REACHABILITY:
+ if (ndo->ndo_vflag) {
+ ND_PRINT(" group %s", GET_IPADDR_STRING(bp + 8));
+ if (GET_BE_U_4(bp + 12) != 0xffffffff)
+ ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
+ ND_PRINT(" RP %s hold ", GET_IPADDR_STRING(bp + 16));
+ unsigned_relts_print(ndo, GET_BE_U_2(bp + 22));
+ }
+ break;
+ case PIMV1_TYPE_ASSERT:
+ ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 16),
+ GET_IPADDR_STRING(bp + 8));
+ if (GET_BE_U_4(bp + 12) != 0xffffffff)
+ ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
+ ND_PRINT(" %s pref %u metric %u",
+ (GET_U_1(bp + 20) & 0x80) ? "RP-tree" : "SPT",
+ GET_BE_U_4(bp + 20) & 0x7fffffff,
+ GET_BE_U_4(bp + 24));
+ break;
+ case PIMV1_TYPE_JOIN_PRUNE:
+ case PIMV1_TYPE_GRAFT:
+ case PIMV1_TYPE_GRAFT_ACK:
+ if (ndo->ndo_vflag) {
+ if (len < 8)
+ goto trunc;
+ pimv1_join_prune_print(ndo, bp + 8, len - 8);
+ }
+ break;
+ }
+ if ((GET_U_1(bp + 4) >> 4) != 1)
+ ND_PRINT(" [v%u]", GET_U_1(bp + 4) >> 4);
+ return;
+
+trunc:
+ nd_print_trunc(ndo);
+}
+
+/*
+ * auto-RP is a cisco protocol, documented at
+ * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
+ *
+ * This implements version 1+, dated Sept 9, 1998.
+ */
+void
+cisco_autorp_print(netdissect_options *ndo,
+ const u_char *bp, u_int len)
+{
+ u_int type;
+ u_int numrps;
+ u_int hold;
+
+ ndo->ndo_protocol = "cisco_autorp";
+ if (len < 8)
+ goto trunc;
+ ND_PRINT(" auto-rp ");
+ type = GET_U_1(bp);
+ switch (type) {
+ case 0x11:
+ ND_PRINT("candidate-advert");
+ break;
+ case 0x12:
+ ND_PRINT("mapping");
+ break;
+ default:
+ ND_PRINT("type-0x%02x", type);
+ break;
+ }
+
+ numrps = GET_U_1(bp + 1);
+
+ ND_PRINT(" Hold ");
+ hold = GET_BE_U_2(bp + 2);
+ if (hold)
+ unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
+ else
+ ND_PRINT("FOREVER");
+
+ /* Next 4 bytes are reserved. */
+
+ bp += 8; len -= 8;
+
+ /*XXX skip unless -v? */
+
+ /*
+ * Rest of packet:
+ * numrps entries of the form:
+ * 32 bits: RP
+ * 6 bits: reserved
+ * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
+ * 8 bits: # of entries for this RP
+ * each entry: 7 bits: reserved, 1 bit: negative,
+ * 8 bits: mask 32 bits: source
+ * lather, rinse, repeat.
+ */
+ while (numrps != 0) {
+ u_int nentries;
+ char s;
+
+ if (len < 4)
+ goto trunc;
+ ND_PRINT(" RP %s", GET_IPADDR_STRING(bp));
+ bp += 4;
+ len -= 4;
+ if (len < 1)
+ goto trunc;
+ switch (GET_U_1(bp) & 0x3) {
+ case 0: ND_PRINT(" PIMv?");
+ break;
+ case 1: ND_PRINT(" PIMv1");
+ break;
+ case 2: ND_PRINT(" PIMv2");
+ break;
+ case 3: ND_PRINT(" PIMv1+2");
+ break;
+ }
+ if (GET_U_1(bp) & 0xfc)
+ ND_PRINT(" [rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
+ bp += 1;
+ len -= 1;
+ if (len < 1)
+ goto trunc;
+ nentries = GET_U_1(bp);
+ bp += 1;
+ len -= 1;
+ s = ' ';
+ while (nentries != 0) {
+ if (len < 6)
+ goto trunc;
+ ND_PRINT("%c%s%s/%u", s, GET_U_1(bp) & 1 ? "!" : "",
+ GET_IPADDR_STRING(bp + 2), GET_U_1(bp + 1));
+ if (GET_U_1(bp) & 0x02) {
+ ND_PRINT(" bidir");
+ }
+ if (GET_U_1(bp) & 0xfc) {
+ ND_PRINT("[rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
+ }
+ s = ',';
+ bp += 6; len -= 6;
+ nentries--;
+ }
+ numrps--;
+ }
+ return;
+
+trunc:
+ nd_print_trunc(ndo);
+}
+
+void
+pim_print(netdissect_options *ndo,
+ const u_char *bp, u_int len, const u_char *bp2)
+{
+ const struct pim *pim = (const struct pim *)bp;
+ uint8_t pim_typever;
+
+ ndo->ndo_protocol = "pim";
+
+ pim_typever = GET_U_1(pim->pim_typever);
+ switch (PIM_VER(pim_typever)) {
+ case 2:
+ if (!ndo->ndo_vflag) {
+ ND_PRINT("PIMv%u, %s, length %u",
+ PIM_VER(pim_typever),
+ tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)),
+ len);
+ return;
+ } else {
+ ND_PRINT("PIMv%u, length %u\n\t%s",
+ PIM_VER(pim_typever),
+ len,
+ tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)));
+ pimv2_print(ndo, bp, len, bp2);
+ }
+ break;
+ default:
+ ND_PRINT("PIMv%u, length %u",
+ PIM_VER(pim_typever),
+ len);
+ break;
+ }
+}
+
+/*
+ * PIMv2 uses encoded address representations.
+ *
+ * The last PIM-SM I-D before RFC2117 was published specified the
+ * following representation for unicast addresses. However, RFC2117
+ * specified no encoding for unicast addresses with the unicast
+ * address length specified in the header. Therefore, we have to
+ * guess which encoding is being used (Cisco's PIMv2 implementation
+ * uses the non-RFC encoding). RFC2117 turns a previously "Reserved"
+ * field into a 'unicast-address-length-in-bytes' field. We guess
+ * that it's the draft encoding if this reserved field is zero.
+ *
+ * RFC2362 goes back to the encoded format, and calls the addr length
+ * field "reserved" again.
+ *
+ * The first byte is the address family, from:
+ *
+ * 0 Reserved
+ * 1 IP (IP version 4)
+ * 2 IP6 (IP version 6)
+ * 3 NSAP
+ * 4 HDLC (8-bit multidrop)
+ * 5 BBN 1822
+ * 6 802 (includes all 802 media plus Ethernet "canonical format")
+ * 7 E.163
+ * 8 E.164 (SMDS, Frame Relay, ATM)
+ * 9 F.69 (Telex)
+ * 10 X.121 (X.25, Frame Relay)
+ * 11 IPX
+ * 12 Appletalk
+ * 13 Decnet IV
+ * 14 Banyan Vines
+ * 15 E.164 with NSAP format subaddress
+ *
+ * In addition, the second byte is an "Encoding". 0 is the default
+ * encoding for the address family, and no other encodings are currently
+ * specified.
+ *
+ */
+
+enum pimv2_addrtype {
+ pimv2_unicast, pimv2_group, pimv2_source
+};
+
+/* 0 1 2 3
+ * 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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Addr Family | Encoding Type | Unicast Address |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
+ * 0 1 2 3
+ * 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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Addr Family | Encoding Type | Reserved | Mask Len |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Group multicast Address |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * 0 1 2 3
+ * 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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Source Address |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+static int
+pimv2_addr_print(netdissect_options *ndo,
+ const u_char *bp, u_int len, enum pimv2_addrtype at,
+ u_int addr_len, int silent)
+{
+ u_int af;
+ int hdrlen;
+
+ if (addr_len == 0) {
+ if (len < 2)
+ goto trunc;
+ switch (GET_U_1(bp)) {
+ case 1:
+ af = AF_INET;
+ addr_len = (u_int)sizeof(nd_ipv4);
+ break;
+ case 2:
+ af = AF_INET6;
+ addr_len = (u_int)sizeof(nd_ipv6);
+ break;
+ default:
+ return -1;
+ }
+ if (GET_U_1(bp + 1) != 0)
+ return -1;
+ hdrlen = 2;
+ } else {
+ switch (addr_len) {
+ case sizeof(nd_ipv4):
+ af = AF_INET;
+ break;
+ case sizeof(nd_ipv6):
+ af = AF_INET6;
+ break;
+ default:
+ return -1;
+ break;
+ }
+ hdrlen = 0;
+ }
+
+ bp += hdrlen;
+ len -= hdrlen;
+ switch (at) {
+ case pimv2_unicast:
+ if (len < addr_len)
+ goto trunc;
+ ND_TCHECK_LEN(bp, addr_len);
+ if (af == AF_INET) {
+ if (!silent)
+ ND_PRINT("%s", GET_IPADDR_STRING(bp));
+ }
+ else if (af == AF_INET6) {
+ if (!silent)
+ ND_PRINT("%s", GET_IP6ADDR_STRING(bp));
+ }
+ return hdrlen + addr_len;
+ case pimv2_group:
+ case pimv2_source:
+ if (len < addr_len + 2)
+ goto trunc;
+ ND_TCHECK_LEN(bp, addr_len + 2);
+ if (af == AF_INET) {
+ if (!silent) {
+ ND_PRINT("%s", GET_IPADDR_STRING(bp + 2));
+ if (GET_U_1(bp + 1) != 32)
+ ND_PRINT("/%u", GET_U_1(bp + 1));
+ }
+ }
+ else if (af == AF_INET6) {
+ if (!silent) {
+ ND_PRINT("%s", GET_IP6ADDR_STRING(bp + 2));
+ if (GET_U_1(bp + 1) != 128)
+ ND_PRINT("/%u", GET_U_1(bp + 1));
+ }
+ }
+ if (GET_U_1(bp) && !silent) {
+ if (at == pimv2_group) {
+ ND_PRINT("(0x%02x)", GET_U_1(bp));
+ } else {
+ ND_PRINT("(%s%s%s",
+ GET_U_1(bp) & 0x04 ? "S" : "",
+ GET_U_1(bp) & 0x02 ? "W" : "",
+ GET_U_1(bp) & 0x01 ? "R" : "");
+ if (GET_U_1(bp) & 0xf8) {
+ ND_PRINT("+0x%02x",
+ GET_U_1(bp) & 0xf8);
+ }
+ ND_PRINT(")");
+ }
+ }
+ return hdrlen + 2 + addr_len;
+ default:
+ return -1;
+ }
+trunc:
+ return -1;
+}
+
+enum checksum_status {
+ CORRECT,
+ INCORRECT,
+ UNVERIFIED
+};
+
+static enum checksum_status
+pimv2_check_checksum(netdissect_options *ndo, const u_char *bp,
+ const u_char *bp2, u_int len)
+{
+ const struct ip *ip;
+ u_int cksum;
+
+ if (!ND_TTEST_LEN(bp, len)) {
+ /* We don't have all the data. */
+ return (UNVERIFIED);
+ }
+ ip = (const struct ip *)bp2;
+ if (IP_V(ip) == 4) {
+ struct cksum_vec vec[1];
+
+ vec[0].ptr = bp;
+ vec[0].len = len;
+ cksum = in_cksum(vec, 1);
+ return (cksum ? INCORRECT : CORRECT);
+ } else if (IP_V(ip) == 6) {
+ const struct ip6_hdr *ip6;
+
+ ip6 = (const struct ip6_hdr *)bp2;
+ cksum = nextproto6_cksum(ndo, ip6, bp, len, len, IPPROTO_PIM);
+ return (cksum ? INCORRECT : CORRECT);
+ } else {
+ return (UNVERIFIED);
+ }
+}
+
+static void
+pimv2_print(netdissect_options *ndo,
+ const u_char *bp, u_int len, const u_char *bp2)
+{
+ const struct pim *pim = (const struct pim *)bp;
+ int advance;
+ int subtype;
+ enum checksum_status cksum_status;
+ u_int pim_typever;
+ u_int pimv2_addr_len;
+
+ ndo->ndo_protocol = "pimv2";
+ if (len < 2) {
+ ND_PRINT("[length %u < 2]", len);
+ nd_print_invalid(ndo);
+ return;
+ }
+ pim_typever = GET_U_1(pim->pim_typever);
+ /* RFC5015 allocates the high 4 bits of pim_rsv for "subtype". */
+ pimv2_addr_len = GET_U_1(pim->pim_rsv) & 0x0f;
+ if (pimv2_addr_len != 0)
+ ND_PRINT(", RFC2117-encoding");
+
+ if (len < 4) {
+ ND_PRINT("[length %u < 4]", len);
+ nd_print_invalid(ndo);
+ return;
+ }
+ ND_PRINT(", cksum 0x%04x ", GET_BE_U_2(pim->pim_cksum));
+ if (GET_BE_U_2(pim->pim_cksum) == 0) {
+ ND_PRINT("(unverified)");
+ } else {
+ if (PIM_TYPE(pim_typever) == PIMV2_TYPE_REGISTER) {
+ /*
+ * The checksum only covers the packet header,
+ * not the encapsulated packet.
+ */
+ cksum_status = pimv2_check_checksum(ndo, bp, bp2, 8);
+ if (cksum_status == INCORRECT) {
+ /*
+ * To quote RFC 4601, "For interoperability
+ * reasons, a message carrying a checksum
+ * calculated over the entire PIM Register
+ * message should also be accepted."
+ */
+ cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
+ }
+ } else {
+ /*
+ * The checksum covers the entire packet.
+ */
+ cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
+ }
+ switch (cksum_status) {
+
+ case CORRECT:
+ ND_PRINT("(correct)");
+ break;
+
+ case INCORRECT:
+ ND_PRINT("(incorrect)");
+ break;
+
+ case UNVERIFIED:
+ ND_PRINT("(unverified)");
+ break;
+ }
+ }
+ bp += 4;
+ len -= 4;
+
+ switch (PIM_TYPE(pim_typever)) {
+ case PIMV2_TYPE_HELLO:
+ {
+ uint16_t otype, olen;
+ while (len > 0) {
+ if (len < 4)
+ goto trunc;
+ otype = GET_BE_U_2(bp);
+ olen = GET_BE_U_2(bp + 2);
+ ND_PRINT("\n\t %s Option (%u), length %u, Value: ",
+ tok2str(pimv2_hello_option_values, "Unknown", otype),
+ otype,
+ olen);
+ bp += 4;
+ len -= 4;
+
+ if (len < olen)
+ goto trunc;
+ ND_TCHECK_LEN(bp, olen);
+ switch (otype) {
+ case PIMV2_HELLO_OPTION_HOLDTIME:
+ if (olen != 2) {
+ ND_PRINT("[option length %u != 2]", olen);
+ nd_print_invalid(ndo);
+ return;
+ } else {
+ unsigned_relts_print(ndo,
+ GET_BE_U_2(bp));
+ }
+ break;
+
+ case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
+ if (olen != 4) {
+ ND_PRINT("[option length %u != 4]", olen);
+ nd_print_invalid(ndo);
+ return;
+ } else {
+ char t_bit;
+ uint16_t lan_delay, override_interval;
+ lan_delay = GET_BE_U_2(bp);
+ override_interval = GET_BE_U_2(bp + 2);
+ t_bit = (lan_delay & 0x8000)? 1 : 0;
+ lan_delay &= ~0x8000;
+ ND_PRINT("\n\t T-bit=%u, LAN delay %ums, Override interval %ums",
+ t_bit, lan_delay, override_interval);
+ }
+ break;
+
+ case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
+ case PIMV2_HELLO_OPTION_DR_PRIORITY:
+ switch (olen) {
+ case 0:
+ ND_PRINT("Bi-Directional Capability (Old)");
+ break;
+ case 4:
+ ND_PRINT("%u", GET_BE_U_4(bp));
+ break;
+ default:
+ ND_PRINT("[option length %u != 4]", olen);
+ nd_print_invalid(ndo);
+ return;
+ break;
+ }
+ break;
+
+ case PIMV2_HELLO_OPTION_GENID:
+ if (olen != 4) {
+ ND_PRINT("[option length %u != 4]", olen);
+ nd_print_invalid(ndo);
+ return;
+ } else {
+ ND_PRINT("0x%08x", GET_BE_U_4(bp));
+ }
+ break;
+
+ case PIMV2_HELLO_OPTION_REFRESH_CAP:
+ if (olen != 4) {
+ ND_PRINT("[option length %u != 4]", olen);
+ nd_print_invalid(ndo);
+ return;
+ } else {
+ ND_PRINT("v%u", GET_U_1(bp));
+ if (GET_U_1(bp + 1) != 0) {
+ ND_PRINT(", interval ");
+ unsigned_relts_print(ndo,
+ GET_U_1(bp + 1));
+ }
+ if (GET_BE_U_2(bp + 2) != 0) {
+ ND_PRINT(" ?0x%04x?",
+ GET_BE_U_2(bp + 2));
+ }
+ }
+ break;
+
+ case PIMV2_HELLO_OPTION_BIDIR_CAP:
+ break;
+
+ case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
+ case PIMV2_HELLO_OPTION_ADDRESS_LIST:
+ if (ndo->ndo_vflag > 1) {
+ const u_char *ptr = bp;
+ u_int plen = len;
+ while (ptr < (bp+olen)) {
+ ND_PRINT("\n\t ");
+ advance = pimv2_addr_print(ndo, ptr, plen, pimv2_unicast, pimv2_addr_len, 0);
+ if (advance < 0)
+ goto trunc;
+ ptr += advance;
+ plen -= advance;
+ }
+ }
+ break;
+ default:
+ if (ndo->ndo_vflag <= 1)
+ print_unknown_data(ndo, bp, "\n\t ", olen);
+ break;
+ }
+ /* do we want to see an additionally hexdump ? */
+ if (ndo->ndo_vflag> 1)
+ print_unknown_data(ndo, bp, "\n\t ", olen);
+ bp += olen;
+ len -= olen;
+ }
+ break;
+ }
+
+ case PIMV2_TYPE_REGISTER:
+ {
+ const struct ip *ip;
+
+ if (len < 4)
+ goto trunc;
+ ND_TCHECK_LEN(bp, PIMV2_REGISTER_FLAG_LEN);
+
+ ND_PRINT(", Flags [ %s ]\n\t",
+ tok2str(pimv2_register_flag_values,
+ "none",
+ GET_BE_U_4(bp)));
+
+ bp += 4; len -= 4;
+ /* encapsulated multicast packet */
+ if (len == 0)
+ goto trunc;
+ ip = (const struct ip *)bp;
+ switch (IP_V(ip)) {
+ case 0: /* Null header */
+ ND_PRINT("IP-Null-header %s > %s",
+ GET_IPADDR_STRING(ip->ip_src),
+ GET_IPADDR_STRING(ip->ip_dst));
+ break;
+
+ case 4: /* IPv4 */
+ ip_print(ndo, bp, len);
+ break;
+
+ case 6: /* IPv6 */
+ ip6_print(ndo, bp, len);
+ break;
+
+ default:
+ ND_PRINT("IP ver %u", IP_V(ip));
+ break;
+ }
+ break;
+ }
+
+ case PIMV2_TYPE_REGISTER_STOP:
+ ND_PRINT(" group=");
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
+ goto trunc;
+ bp += advance; len -= advance;
+ ND_PRINT(" source=");
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
+ goto trunc;
+ bp += advance; len -= advance;
+ break;
+
+ case PIMV2_TYPE_JOIN_PRUNE:
+ case PIMV2_TYPE_GRAFT:
+ case PIMV2_TYPE_GRAFT_ACK:
+
+
+ /*
+ * 0 1 2 3
+ * 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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |PIM Ver| Type | Addr length | Checksum |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Unicast-Upstream Neighbor Address |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Reserved | Num groups | Holdtime |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Encoded-Multicast Group Address-1 |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Number of Joined Sources | Number of Pruned Sources |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Encoded-Joined Source Address-1 |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | . |
+ * | . |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Encoded-Joined Source Address-n |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Encoded-Pruned Source Address-1 |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | . |
+ * | . |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Encoded-Pruned Source Address-n |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | . |
+ * | . |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Encoded-Multicast Group Address-n |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+ {
+ uint8_t ngroup;
+ uint16_t holdtime;
+ uint16_t njoin;
+ uint16_t nprune;
+ u_int i, j;
+
+ if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
+ ND_PRINT(", upstream-neighbor: ");
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
+ goto trunc;
+ bp += advance; len -= advance;
+ }
+ if (len < 4)
+ goto trunc;
+ ND_TCHECK_4(bp);
+ ngroup = GET_U_1(bp + 1);
+ holdtime = GET_BE_U_2(bp + 2);
+ ND_PRINT("\n\t %u group(s)", ngroup);
+ if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
+ ND_PRINT(", holdtime: ");
+ if (holdtime == 0xffff)
+ ND_PRINT("infinite");
+ else
+ unsigned_relts_print(ndo, holdtime);
+ }
+ bp += 4; len -= 4;
+ for (i = 0; i < ngroup; i++) {
+ ND_PRINT("\n\t group #%u: ", i+1);
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
+ goto trunc;
+ bp += advance; len -= advance;
+ if (len < 4)
+ goto trunc;
+ ND_TCHECK_4(bp);
+ njoin = GET_BE_U_2(bp);
+ nprune = GET_BE_U_2(bp + 2);
+ ND_PRINT(", joined sources: %u, pruned sources: %u", njoin, nprune);
+ bp += 4; len -= 4;
+ for (j = 0; j < njoin; j++) {
+ ND_PRINT("\n\t joined source #%u: ", j+1);
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
+ goto trunc;
+ bp += advance; len -= advance;
+ }
+ for (j = 0; j < nprune; j++) {
+ ND_PRINT("\n\t pruned source #%u: ", j+1);
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
+ goto trunc;
+ bp += advance; len -= advance;
+ }
+ }
+ break;
+ }
+
+ case PIMV2_TYPE_BOOTSTRAP:
+ {
+ u_int i, j, frpcnt;
+
+ /* Fragment Tag, Hash Mask len, and BSR-priority */
+ if (len < 2)
+ goto trunc;
+ ND_PRINT(" tag=%x", GET_BE_U_2(bp));
+ bp += 2;
+ len -= 2;
+ if (len < 1)
+ goto trunc;
+ ND_PRINT(" hashmlen=%u", GET_U_1(bp));
+ if (len < 2)
+ goto trunc;
+ ND_TCHECK_1(bp + 2);
+ ND_PRINT(" BSRprio=%u", GET_U_1(bp + 1));
+ bp += 2;
+ len -= 2;
+
+ /* Encoded-Unicast-BSR-Address */
+ ND_PRINT(" BSR=");
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
+ goto trunc;
+ bp += advance;
+ len -= advance;
+
+ for (i = 0; len > 0; i++) {
+ /* Encoded-Group Address */
+ ND_PRINT(" (group%u: ", i);
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
+ goto trunc;
+ bp += advance;
+ len -= advance;
+
+ /* RP-Count, Frag RP-Cnt, and rsvd */
+ if (len < 1)
+ goto trunc;
+ ND_PRINT(" RPcnt=%u", GET_U_1(bp));
+ if (len < 2)
+ goto trunc;
+ frpcnt = GET_U_1(bp + 1);
+ ND_PRINT(" FRPcnt=%u", frpcnt);
+ if (len < 4)
+ goto trunc;
+ bp += 4;
+ len -= 4;
+
+ for (j = 0; j < frpcnt && len > 0; j++) {
+ /* each RP info */
+ ND_PRINT(" RP%u=", j);
+ if ((advance = pimv2_addr_print(ndo, bp, len,
+ pimv2_unicast,
+ pimv2_addr_len,
+ 0)) < 0)
+ goto trunc;
+ bp += advance;
+ len -= advance;
+
+ if (len < 2)
+ goto trunc;
+ ND_PRINT(",holdtime=");
+ unsigned_relts_print(ndo,
+ GET_BE_U_2(bp));
+ if (len < 3)
+ goto trunc;
+ ND_PRINT(",prio=%u", GET_U_1(bp + 2));
+ if (len < 4)
+ goto trunc;
+ bp += 4;
+ len -= 4;
+ }
+ ND_PRINT(")");
+ }
+ break;
+ }
+ case PIMV2_TYPE_ASSERT:
+ ND_PRINT(" group=");
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
+ goto trunc;
+ bp += advance; len -= advance;
+ ND_PRINT(" src=");
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
+ goto trunc;
+ bp += advance; len -= advance;
+ if (len < 8)
+ goto trunc;
+ ND_TCHECK_8(bp);
+ if (GET_U_1(bp) & 0x80)
+ ND_PRINT(" RPT");
+ ND_PRINT(" pref=%u", GET_BE_U_4(bp) & 0x7fffffff);
+ ND_PRINT(" metric=%u", GET_BE_U_4(bp + 4));
+ break;
+
+ case PIMV2_TYPE_CANDIDATE_RP:
+ {
+ u_int i, pfxcnt;
+
+ /* Prefix-Cnt, Priority, and Holdtime */
+ if (len < 1)
+ goto trunc;
+ ND_PRINT(" prefix-cnt=%u", GET_U_1(bp));
+ pfxcnt = GET_U_1(bp);
+ if (len < 2)
+ goto trunc;
+ ND_PRINT(" prio=%u", GET_U_1(bp + 1));
+ if (len < 4)
+ goto trunc;
+ ND_PRINT(" holdtime=");
+ unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
+ bp += 4;
+ len -= 4;
+
+ /* Encoded-Unicast-RP-Address */
+ ND_PRINT(" RP=");
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
+ goto trunc;
+ bp += advance;
+ len -= advance;
+
+ /* Encoded-Group Addresses */
+ for (i = 0; i < pfxcnt && len > 0; i++) {
+ ND_PRINT(" Group%u=", i);
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
+ goto trunc;
+ bp += advance;
+ len -= advance;
+ }
+ break;
+ }
+
+ case PIMV2_TYPE_PRUNE_REFRESH:
+ ND_PRINT(" src=");
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
+ goto trunc;
+ bp += advance;
+ len -= advance;
+ ND_PRINT(" grp=");
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
+ goto trunc;
+ bp += advance;
+ len -= advance;
+ ND_PRINT(" forwarder=");
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
+ goto trunc;
+ bp += advance;
+ len -= advance;
+ if (len < 2)
+ goto trunc;
+ ND_PRINT(" TUNR ");
+ unsigned_relts_print(ndo, GET_BE_U_2(bp));
+ break;
+
+ case PIMV2_TYPE_DF_ELECTION:
+ subtype = PIM_SUBTYPE(GET_U_1(pim->pim_rsv));
+ ND_PRINT("\n\t %s,", tok2str( pimv2_df_election_flag_values,
+ "Unknown", subtype) );
+
+ ND_PRINT(" rpa=");
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
+ goto trunc;
+ }
+ bp += advance;
+ len -= advance;
+ ND_PRINT(" sender pref=%u", GET_BE_U_4(bp) );
+ ND_PRINT(" sender metric=%u", GET_BE_U_4(bp + 4));
+
+ bp += 8;
+ len -= 8;
+
+ switch (subtype) {
+ case PIMV2_DF_ELECTION_BACKOFF:
+ case PIMV2_DF_ELECTION_PASS:
+ ND_PRINT("\n\t %s addr=", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype));
+ if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
+ goto trunc;
+ }
+ bp += advance;
+ len -= advance;
+
+ ND_PRINT(" %s pref=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp) );
+ ND_PRINT(" %s metric=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp + 4));
+
+ bp += 8;
+ len -= 8;
+
+ if (subtype == PIMV2_DF_ELECTION_BACKOFF) {
+ ND_PRINT(" interval %dms", GET_BE_U_2(bp));
+ }
+
+ break;
+ default:
+ break;
+ }
+ break;
+
+ default:
+ ND_PRINT(" [type %u]", PIM_TYPE(pim_typever));
+ break;
+ }
+
+ return;
+
+trunc:
+ nd_print_trunc(ndo);
+}