print-igmp.c - platform/external/tcpdump - Git at Google

 /*
  * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994, 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: Internet Group Management Protocol (IGMP) printer */

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #include <netdissect-stdinc.h>

 #include "netdissect.h"
 #include "addrtoname.h"
 #include "extract.h"

 #ifndef IN_CLASSD
 #define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000)
 #endif

 static const char tstr[] = "[|igmp]";

 /* (following from ipmulti/mrouted/prune.h) */

 /*
  * The packet format for a traceroute request.
  */
 struct tr_query {
     uint32_t  tr_src;          /* traceroute source */
     uint32_t  tr_dst;          /* traceroute destination */
     uint32_t  tr_raddr;        /* traceroute response address */
     uint32_t  tr_rttlqid;      /* response ttl and qid */
 };

 #define TR_GETTTL(x)        (int)(((x) >> 24) & 0xff)
 #define TR_GETQID(x)        ((x) & 0x00ffffff)

 /*
  * Traceroute response format.  A traceroute response has a tr_query at the
  * beginning, followed by one tr_resp for each hop taken.
  */
 struct tr_resp {
     uint32_t tr_qarr;          /* query arrival time */
     uint32_t tr_inaddr;        /* incoming interface address */
     uint32_t tr_outaddr;       /* outgoing interface address */
     uint32_t tr_rmtaddr;       /* parent address in source tree */
     uint32_t tr_vifin;         /* input packet count on interface */
     uint32_t tr_vifout;        /* output packet count on interface */
     uint32_t tr_pktcnt;        /* total incoming packets for src-grp */
     uint8_t  tr_rproto;      /* routing proto deployed on router */
     uint8_t  tr_fttl;        /* ttl required to forward on outvif */
     uint8_t  tr_smask;       /* subnet mask for src addr */
     uint8_t  tr_rflags;      /* forwarding error codes */
 };

 /* defs within mtrace */
 #define TR_QUERY 1
 #define TR_RESP 2

 /* fields for tr_rflags (forwarding error codes) */
 #define TR_NO_ERR   0
 #define TR_WRONG_IF 1
 #define TR_PRUNED   2
 #define TR_OPRUNED  3
 #define TR_SCOPED   4
 #define TR_NO_RTE   5
 #define TR_NO_FWD   7
 #define TR_NO_SPACE 0x81
 #define TR_OLD_ROUTER   0x82

 /* fields for tr_rproto (routing protocol) */
 #define TR_PROTO_DVMRP  1
 #define TR_PROTO_MOSPF  2
 #define TR_PROTO_PIM    3
 #define TR_PROTO_CBT    4

 /* igmpv3 report types */
 static const struct tok igmpv3report2str[] = {
 	{ 1,	"is_in" },
 	{ 2,	"is_ex" },
 	{ 3,	"to_in" },
 	{ 4,	"to_ex" },
 	{ 5,	"allow" },
 	{ 6,	"block" },
 	{ 0,	NULL }
 };

 static void
 print_mtrace(netdissect_options *ndo,
              register const u_char *bp, register u_int len)
 {
     register const struct tr_query *tr = (const struct tr_query *)(bp + 8);

     ND_TCHECK(*tr);
     if (len < 8 + sizeof (struct tr_query)) {
 	ND_PRINT((ndo, " [invalid len %d]", len));
 	return;
     }
     ND_PRINT((ndo, "mtrace %u: %s to %s reply-to %s",
         TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)),
         ipaddr_string(ndo, &tr->tr_src), ipaddr_string(ndo, &tr->tr_dst),
         ipaddr_string(ndo, &tr->tr_raddr)));
     if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr)))
         ND_PRINT((ndo, " with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid))));
     return;
 trunc:
     ND_PRINT((ndo, "%s", tstr));
 }

 static void
 print_mresp(netdissect_options *ndo,
             register const u_char *bp, register u_int len)
 {
     register const struct tr_query *tr = (const struct tr_query *)(bp + 8);

     ND_TCHECK(*tr);
     if (len < 8 + sizeof (struct tr_query)) {
 	ND_PRINT((ndo, " [invalid len %d]", len));
 	return;
     }
     ND_PRINT((ndo, "mresp %lu: %s to %s reply-to %s",
         (u_long)TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)),
         ipaddr_string(ndo, &tr->tr_src), ipaddr_string(ndo, &tr->tr_dst),
         ipaddr_string(ndo, &tr->tr_raddr)));
     if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr)))
         ND_PRINT((ndo, " with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid))));
     return;
 trunc:
     ND_PRINT((ndo, "%s", tstr));
 }

 static void
 print_igmpv3_report(netdissect_options *ndo,
                     register const u_char *bp, register u_int len)
 {
     u_int group, nsrcs, ngroups;
     register u_int i, j;

     /* Minimum len is 16, and should be a multiple of 4 */
     if (len < 16 || len & 0x03) {
 	ND_PRINT((ndo, " [invalid len %d]", len));
 	return;
     }
     ND_TCHECK2(bp[6], 2);
     ngroups = EXTRACT_16BITS(&bp[6]);
     ND_PRINT((ndo, ", %d group record(s)", ngroups));
     if (ndo->ndo_vflag > 0) {
 	/* Print the group records */
 	group = 8;
         for (i=0; i<ngroups; i++) {
 	    if (len < group+8) {
 		ND_PRINT((ndo, " [invalid number of groups]"));
 		return;
 	    }
 	    ND_TCHECK2(bp[group+4], 4);
             ND_PRINT((ndo, " [gaddr %s", ipaddr_string(ndo, &bp[group+4])));
 	    ND_PRINT((ndo, " %s", tok2str(igmpv3report2str, " [v3-report-#%d]",
 								bp[group])));
             nsrcs = EXTRACT_16BITS(&bp[group+2]);
 	    /* Check the number of sources and print them */
 	    if (len < group+8+(nsrcs<<2)) {
 		ND_PRINT((ndo, " [invalid number of sources %d]", nsrcs));
 		return;
 	    }
             if (ndo->ndo_vflag == 1)
                 ND_PRINT((ndo, ", %d source(s)", nsrcs));
             else {
 		/* Print the sources */
                 ND_PRINT((ndo, " {"));
                 for (j=0; j<nsrcs; j++) {
 		    ND_TCHECK2(bp[group+8+(j<<2)], 4);
 		    ND_PRINT((ndo, " %s", ipaddr_string(ndo, &bp[group+8+(j<<2)])));
 		}
                 ND_PRINT((ndo, " }"));
             }
 	    /* Next group record */
             group += 8 + (nsrcs << 2);
 	    ND_PRINT((ndo, "]"));
         }
     }
     return;
 trunc:
     ND_PRINT((ndo, "%s", tstr));
 }

 static void
 print_igmpv3_query(netdissect_options *ndo,
                    register const u_char *bp, register u_int len)
 {
     u_int mrc;
     u_int mrt;
     u_int nsrcs;
     register u_int i;

     ND_PRINT((ndo, " v3"));
     /* Minimum len is 12, and should be a multiple of 4 */
     if (len < 12 || len & 0x03) {
 	ND_PRINT((ndo, " [invalid len %d]", len));
 	return;
     }
     ND_TCHECK(bp[1]);
     mrc = bp[1];
     if (mrc < 128) {
 	mrt = mrc;
     } else {
         mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3);
     }
     if (mrc != 100) {
 	ND_PRINT((ndo, " [max resp time "));
         if (mrt < 600) {
             ND_PRINT((ndo, "%.1fs", mrt * 0.1));
         } else {
             unsigned_relts_print(ndo, mrt / 10);
         }
 	ND_PRINT((ndo, "]"));
     }
     ND_TCHECK2(bp[4], 4);
     if (EXTRACT_32BITS(&bp[4]) == 0)
 	return;
     ND_PRINT((ndo, " [gaddr %s", ipaddr_string(ndo, &bp[4])));
     ND_TCHECK2(bp[10], 2);
     nsrcs = EXTRACT_16BITS(&bp[10]);
     if (nsrcs > 0) {
 	if (len < 12 + (nsrcs << 2))
 	    ND_PRINT((ndo, " [invalid number of sources]"));
 	else if (ndo->ndo_vflag > 1) {
 	    ND_PRINT((ndo, " {"));
 	    for (i=0; i<nsrcs; i++) {
 		ND_TCHECK2(bp[12+(i<<2)], 4);
 		ND_PRINT((ndo, " %s", ipaddr_string(ndo, &bp[12+(i<<2)])));
 	    }
 	    ND_PRINT((ndo, " }"));
 	} else
 	    ND_PRINT((ndo, ", %d source(s)", nsrcs));
     }
     ND_PRINT((ndo, "]"));
     return;
 trunc:
     ND_PRINT((ndo, "%s", tstr));
 }

 void
 igmp_print(netdissect_options *ndo,
            register const u_char *bp, register u_int len)
 {
     struct cksum_vec vec[1];

     if (ndo->ndo_qflag) {
         ND_PRINT((ndo, "igmp"));
         return;
     }

     ND_TCHECK(bp[0]);
     switch (bp[0]) {
     case 0x11:
         ND_PRINT((ndo, "igmp query"));
 	if (len >= 12)
 	    print_igmpv3_query(ndo, bp, len);
 	else {
             ND_TCHECK(bp[1]);
 	    if (bp[1]) {
 		ND_PRINT((ndo, " v2"));
 		if (bp[1] != 100)
 		    ND_PRINT((ndo, " [max resp time %d]", bp[1]));
 	    } else
 		ND_PRINT((ndo, " v1"));
             ND_TCHECK2(bp[4], 4);
 	    if (EXTRACT_32BITS(&bp[4]))
                 ND_PRINT((ndo, " [gaddr %s]", ipaddr_string(ndo, &bp[4])));
             if (len != 8)
                 ND_PRINT((ndo, " [len %d]", len));
 	}
         break;
     case 0x12:
         ND_TCHECK2(bp[4], 4);
         ND_PRINT((ndo, "igmp v1 report %s", ipaddr_string(ndo, &bp[4])));
         if (len != 8)
             ND_PRINT((ndo, " [len %d]", len));
         break;
     case 0x16:
         ND_TCHECK2(bp[4], 4);
         ND_PRINT((ndo, "igmp v2 report %s", ipaddr_string(ndo, &bp[4])));
         break;
     case 0x22:
         ND_PRINT((ndo, "igmp v3 report"));
 	print_igmpv3_report(ndo, bp, len);
         break;
     case 0x17:
         ND_TCHECK2(bp[4], 4);
         ND_PRINT((ndo, "igmp leave %s", ipaddr_string(ndo, &bp[4])));
         break;
     case 0x13:
         ND_PRINT((ndo, "igmp dvmrp"));
         if (len < 8)
             ND_PRINT((ndo, " [len %d]", len));
         else
             dvmrp_print(ndo, bp, len);
         break;
     case 0x14:
         ND_PRINT((ndo, "igmp pimv1"));
         pimv1_print(ndo, bp, len);
         break;
     case 0x1e:
         print_mresp(ndo, bp, len);
         break;
     case 0x1f:
         print_mtrace(ndo, bp, len);
         break;
     default:
         ND_PRINT((ndo, "igmp-%d", bp[0]));
         break;
     }

     if (ndo->ndo_vflag && len >= 4 && ND_TTEST2(bp[0], len)) {
         /* Check the IGMP checksum */
         vec[0].ptr = bp;
         vec[0].len = len;
         if (in_cksum(vec, 1))
             ND_PRINT((ndo, " bad igmp cksum %x!", EXTRACT_16BITS(&bp[2])));
     }
     return;
 trunc:
     ND_PRINT((ndo, "%s", tstr));
 }
	/*
	* Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994, 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: Internet Group Management Protocol (IGMP) printer */

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#include <netdissect-stdinc.h>

	#include "netdissect.h"
	#include "addrtoname.h"
	#include "extract.h"

	#ifndef IN_CLASSD
	#define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000)
	#endif

	static const char tstr[] = "[\|igmp]";

	/* (following from ipmulti/mrouted/prune.h) */

	/*
	* The packet format for a traceroute request.
	*/
	struct tr_query {
	uint32_t tr_src; /* traceroute source */
	uint32_t tr_dst; /* traceroute destination */
	uint32_t tr_raddr; /* traceroute response address */
	uint32_t tr_rttlqid; /* response ttl and qid */
	};

	#define TR_GETTTL(x) (int)(((x) >> 24) & 0xff)
	#define TR_GETQID(x) ((x) & 0x00ffffff)

	/*
	* Traceroute response format. A traceroute response has a tr_query at the
	* beginning, followed by one tr_resp for each hop taken.
	*/
	struct tr_resp {
	uint32_t tr_qarr; /* query arrival time */
	uint32_t tr_inaddr; /* incoming interface address */
	uint32_t tr_outaddr; /* outgoing interface address */
	uint32_t tr_rmtaddr; /* parent address in source tree */
	uint32_t tr_vifin; /* input packet count on interface */
	uint32_t tr_vifout; /* output packet count on interface */
	uint32_t tr_pktcnt; /* total incoming packets for src-grp */
	uint8_t tr_rproto; /* routing proto deployed on router */
	uint8_t tr_fttl; /* ttl required to forward on outvif */
	uint8_t tr_smask; /* subnet mask for src addr */
	uint8_t tr_rflags; /* forwarding error codes */
	};

	/* defs within mtrace */
	#define TR_QUERY 1
	#define TR_RESP 2

	/* fields for tr_rflags (forwarding error codes) */
	#define TR_NO_ERR 0
	#define TR_WRONG_IF 1
	#define TR_PRUNED 2
	#define TR_OPRUNED 3
	#define TR_SCOPED 4
	#define TR_NO_RTE 5
	#define TR_NO_FWD 7
	#define TR_NO_SPACE 0x81
	#define TR_OLD_ROUTER 0x82

	/* fields for tr_rproto (routing protocol) */
	#define TR_PROTO_DVMRP 1
	#define TR_PROTO_MOSPF 2
	#define TR_PROTO_PIM 3
	#define TR_PROTO_CBT 4

	/* igmpv3 report types */
	static const struct tok igmpv3report2str[] = {
	{ 1, "is_in" },
	{ 2, "is_ex" },
	{ 3, "to_in" },
	{ 4, "to_ex" },
	{ 5, "allow" },
	{ 6, "block" },
	{ 0, NULL }
	};

	static void
	print_mtrace(netdissect_options *ndo,
	register const u_char *bp, register u_int len)
	{
	register const struct tr_query tr = (const struct tr_query )(bp + 8);

	ND_TCHECK(*tr);
	if (len < 8 + sizeof (struct tr_query)) {
	ND_PRINT((ndo, " [invalid len %d]", len));
	return;
	}
	ND_PRINT((ndo, "mtrace %u: %s to %s reply-to %s",
	TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)),
	ipaddr_string(ndo, &tr->tr_src), ipaddr_string(ndo, &tr->tr_dst),
	ipaddr_string(ndo, &tr->tr_raddr)));
	if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr)))
	ND_PRINT((ndo, " with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid))));
	return;
	trunc:
	ND_PRINT((ndo, "%s", tstr));
	}

	static void
	print_mresp(netdissect_options *ndo,
	register const u_char *bp, register u_int len)
	{
	register const struct tr_query tr = (const struct tr_query )(bp + 8);

	ND_TCHECK(*tr);
	if (len < 8 + sizeof (struct tr_query)) {
	ND_PRINT((ndo, " [invalid len %d]", len));
	return;
	}
	ND_PRINT((ndo, "mresp %lu: %s to %s reply-to %s",
	(u_long)TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)),
	ipaddr_string(ndo, &tr->tr_src), ipaddr_string(ndo, &tr->tr_dst),
	ipaddr_string(ndo, &tr->tr_raddr)));
	if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr)))
	ND_PRINT((ndo, " with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid))));
	return;
	trunc:
	ND_PRINT((ndo, "%s", tstr));
	}

	static void
	print_igmpv3_report(netdissect_options *ndo,
	register const u_char *bp, register u_int len)
	{
	u_int group, nsrcs, ngroups;
	register u_int i, j;

	/* Minimum len is 16, and should be a multiple of 4 */
	if (len < 16 \|\| len & 0x03) {
	ND_PRINT((ndo, " [invalid len %d]", len));
	return;
	}
	ND_TCHECK2(bp[6], 2);
	ngroups = EXTRACT_16BITS(&bp[6]);
	ND_PRINT((ndo, ", %d group record(s)", ngroups));
	if (ndo->ndo_vflag > 0) {
	/* Print the group records */
	group = 8;
	for (i=0; i<ngroups; i++) {
	if (len < group+8) {
	ND_PRINT((ndo, " [invalid number of groups]"));
	return;
	}
	ND_TCHECK2(bp[group+4], 4);
	ND_PRINT((ndo, " [gaddr %s", ipaddr_string(ndo, &bp[group+4])));
	ND_PRINT((ndo, " %s", tok2str(igmpv3report2str, " [v3-report-#%d]",
	bp[group])));
	nsrcs = EXTRACT_16BITS(&bp[group+2]);
	/* Check the number of sources and print them */
	if (len < group+8+(nsrcs<<2)) {
	ND_PRINT((ndo, " [invalid number of sources %d]", nsrcs));
	return;
	}
	if (ndo->ndo_vflag == 1)
	ND_PRINT((ndo, ", %d source(s)", nsrcs));
	else {
	/* Print the sources */
	ND_PRINT((ndo, " {"));
	for (j=0; j<nsrcs; j++) {
	ND_TCHECK2(bp[group+8+(j<<2)], 4);
	ND_PRINT((ndo, " %s", ipaddr_string(ndo, &bp[group+8+(j<<2)])));
	}
	ND_PRINT((ndo, " }"));
	}
	/* Next group record */
	group += 8 + (nsrcs << 2);
	ND_PRINT((ndo, "]"));
	}
	}
	return;
	trunc:
	ND_PRINT((ndo, "%s", tstr));
	}

	static void
	print_igmpv3_query(netdissect_options *ndo,
	register const u_char *bp, register u_int len)
	{
	u_int mrc;
	u_int mrt;
	u_int nsrcs;
	register u_int i;

	ND_PRINT((ndo, " v3"));
	/* Minimum len is 12, and should be a multiple of 4 */
	if (len < 12 \|\| len & 0x03) {
	ND_PRINT((ndo, " [invalid len %d]", len));
	return;
	}
	ND_TCHECK(bp[1]);
	mrc = bp[1];
	if (mrc < 128) {
	mrt = mrc;
	} else {
	mrt = ((mrc & 0x0f) \| 0x10) << (((mrc & 0x70) >> 4) + 3);
	}
	if (mrc != 100) {
	ND_PRINT((ndo, " [max resp time "));
	if (mrt < 600) {
	ND_PRINT((ndo, "%.1fs", mrt * 0.1));
	} else {
	unsigned_relts_print(ndo, mrt / 10);
	}
	ND_PRINT((ndo, "]"));
	}
	ND_TCHECK2(bp[4], 4);
	if (EXTRACT_32BITS(&bp[4]) == 0)
	return;
	ND_PRINT((ndo, " [gaddr %s", ipaddr_string(ndo, &bp[4])));
	ND_TCHECK2(bp[10], 2);
	nsrcs = EXTRACT_16BITS(&bp[10]);
	if (nsrcs > 0) {
	if (len < 12 + (nsrcs << 2))
	ND_PRINT((ndo, " [invalid number of sources]"));
	else if (ndo->ndo_vflag > 1) {
	ND_PRINT((ndo, " {"));
	for (i=0; i<nsrcs; i++) {
	ND_TCHECK2(bp[12+(i<<2)], 4);
	ND_PRINT((ndo, " %s", ipaddr_string(ndo, &bp[12+(i<<2)])));
	}
	ND_PRINT((ndo, " }"));
	} else
	ND_PRINT((ndo, ", %d source(s)", nsrcs));
	}
	ND_PRINT((ndo, "]"));
	return;
	trunc:
	ND_PRINT((ndo, "%s", tstr));
	}

	void
	igmp_print(netdissect_options *ndo,
	register const u_char *bp, register u_int len)
	{
	struct cksum_vec vec[1];

	if (ndo->ndo_qflag) {
	ND_PRINT((ndo, "igmp"));
	return;
	}

	ND_TCHECK(bp[0]);
	switch (bp[0]) {
	case 0x11:
	ND_PRINT((ndo, "igmp query"));
	if (len >= 12)
	print_igmpv3_query(ndo, bp, len);
	else {
	ND_TCHECK(bp[1]);
	if (bp[1]) {
	ND_PRINT((ndo, " v2"));
	if (bp[1] != 100)
	ND_PRINT((ndo, " [max resp time %d]", bp[1]));
	} else
	ND_PRINT((ndo, " v1"));
	ND_TCHECK2(bp[4], 4);
	if (EXTRACT_32BITS(&bp[4]))
	ND_PRINT((ndo, " [gaddr %s]", ipaddr_string(ndo, &bp[4])));
	if (len != 8)
	ND_PRINT((ndo, " [len %d]", len));
	}
	break;
	case 0x12:
	ND_TCHECK2(bp[4], 4);
	ND_PRINT((ndo, "igmp v1 report %s", ipaddr_string(ndo, &bp[4])));
	if (len != 8)
	ND_PRINT((ndo, " [len %d]", len));
	break;
	case 0x16:
	ND_TCHECK2(bp[4], 4);
	ND_PRINT((ndo, "igmp v2 report %s", ipaddr_string(ndo, &bp[4])));
	break;
	case 0x22:
	ND_PRINT((ndo, "igmp v3 report"));
	print_igmpv3_report(ndo, bp, len);
	break;
	case 0x17:
	ND_TCHECK2(bp[4], 4);
	ND_PRINT((ndo, "igmp leave %s", ipaddr_string(ndo, &bp[4])));
	break;
	case 0x13:
	ND_PRINT((ndo, "igmp dvmrp"));
	if (len < 8)
	ND_PRINT((ndo, " [len %d]", len));
	else
	dvmrp_print(ndo, bp, len);
	break;
	case 0x14:
	ND_PRINT((ndo, "igmp pimv1"));
	pimv1_print(ndo, bp, len);
	break;
	case 0x1e:
	print_mresp(ndo, bp, len);
	break;
	case 0x1f:
	print_mtrace(ndo, bp, len);
	break;
	default:
	ND_PRINT((ndo, "igmp-%d", bp[0]));
	break;
	}

	if (ndo->ndo_vflag && len >= 4 && ND_TTEST2(bp[0], len)) {
	/* Check the IGMP checksum */
	vec[0].ptr = bp;
	vec[0].len = len;
	if (in_cksum(vec, 1))
	ND_PRINT((ndo, " bad igmp cksum %x!", EXTRACT_16BITS(&bp[2])));
	}
	return;
	trunc:
	ND_PRINT((ndo, "%s", tstr));
	}