Adding upstream version 4.99.4.upstream/4.99.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1234 insertions, 0 deletions

diff --git a/print-pim.c b/print-pim.c
new file mode 100644
index 0000000..f2db8c7
--- /dev/null
+++ 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);
+}