print-igmp.c revision 127668
175115Sfenner/* 275115Sfenner * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994, 1995, 1996 375115Sfenner * The Regents of the University of California. All rights reserved. 475115Sfenner * 575115Sfenner * Redistribution and use in source and binary forms, with or without 675115Sfenner * modification, are permitted provided that: (1) source code distributions 775115Sfenner * retain the above copyright notice and this paragraph in its entirety, (2) 875115Sfenner * distributions including binary code include the above copyright notice and 975115Sfenner * this paragraph in its entirety in the documentation or other materials 1075115Sfenner * provided with the distribution, and (3) all advertising materials mentioning 1175115Sfenner * features or use of this software display the following acknowledgement: 1275115Sfenner * ``This product includes software developed by the University of California, 1375115Sfenner * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 1475115Sfenner * the University nor the names of its contributors may be used to endorse 1575115Sfenner * or promote products derived from this software without specific prior 1675115Sfenner * written permission. 1775115Sfenner * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 1875115Sfenner * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 1975115Sfenner * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 2075115Sfenner */ 2175115Sfenner 2275115Sfenner#ifndef lint 23127668Sbmsstatic const char rcsid[] _U_ = 24127668Sbms "@(#) $Header: /tcpdump/master/tcpdump/print-igmp.c,v 1.11.2.3 2003/11/19 09:41:29 guy Exp $ (LBL)"; 2575115Sfenner#endif 2675115Sfenner 2775115Sfenner#ifdef HAVE_CONFIG_H 2875115Sfenner#include "config.h" 2975115Sfenner#endif 3075115Sfenner 31127668Sbms#include <tcpdump-stdinc.h> 3275115Sfenner 3375115Sfenner#include <stdio.h> 3475115Sfenner#include <string.h> 3575115Sfenner 3675115Sfenner#include "interface.h" 3775115Sfenner#include "addrtoname.h" 3875115Sfenner#include "extract.h" /* must come after interface.h */ 3975115Sfenner 4075115Sfenner#ifndef IN_CLASSD 4175115Sfenner#define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000) 4275115Sfenner#endif 4375115Sfenner 4475115Sfenner/* (following from ipmulti/mrouted/prune.h) */ 4575115Sfenner 4675115Sfenner/* 4775115Sfenner * The packet format for a traceroute request. 4875115Sfenner */ 4975115Sfennerstruct tr_query { 50127668Sbms u_int32_t tr_src; /* traceroute source */ 51127668Sbms u_int32_t tr_dst; /* traceroute destination */ 52127668Sbms u_int32_t tr_raddr; /* traceroute response address */ 53127668Sbms u_int32_t tr_rttlqid; /* response ttl and qid */ 5475115Sfenner}; 5575115Sfenner 5675115Sfenner#define TR_GETTTL(x) (int)(((x) >> 24) & 0xff) 5775115Sfenner#define TR_GETQID(x) ((x) & 0x00ffffff) 5875115Sfenner 5975115Sfenner/* 6075115Sfenner * Traceroute response format. A traceroute response has a tr_query at the 6175115Sfenner * beginning, followed by one tr_resp for each hop taken. 6275115Sfenner */ 6375115Sfennerstruct tr_resp { 64127668Sbms u_int32_t tr_qarr; /* query arrival time */ 65127668Sbms u_int32_t tr_inaddr; /* incoming interface address */ 66127668Sbms u_int32_t tr_outaddr; /* outgoing interface address */ 67127668Sbms u_int32_t tr_rmtaddr; /* parent address in source tree */ 68127668Sbms u_int32_t tr_vifin; /* input packet count on interface */ 69127668Sbms u_int32_t tr_vifout; /* output packet count on interface */ 70127668Sbms u_int32_t tr_pktcnt; /* total incoming packets for src-grp */ 71127668Sbms u_int8_t tr_rproto; /* routing proto deployed on router */ 72127668Sbms u_int8_t tr_fttl; /* ttl required to forward on outvif */ 73127668Sbms u_int8_t tr_smask; /* subnet mask for src addr */ 74127668Sbms u_int8_t tr_rflags; /* forwarding error codes */ 7575115Sfenner}; 7675115Sfenner 7775115Sfenner/* defs within mtrace */ 7875115Sfenner#define TR_QUERY 1 7975115Sfenner#define TR_RESP 2 8075115Sfenner 8175115Sfenner/* fields for tr_rflags (forwarding error codes) */ 8275115Sfenner#define TR_NO_ERR 0 8375115Sfenner#define TR_WRONG_IF 1 8475115Sfenner#define TR_PRUNED 2 8575115Sfenner#define TR_OPRUNED 3 8675115Sfenner#define TR_SCOPED 4 8775115Sfenner#define TR_NO_RTE 5 8875115Sfenner#define TR_NO_FWD 7 8975115Sfenner#define TR_NO_SPACE 0x81 9075115Sfenner#define TR_OLD_ROUTER 0x82 9175115Sfenner 9275115Sfenner/* fields for tr_rproto (routing protocol) */ 9375115Sfenner#define TR_PROTO_DVMRP 1 9475115Sfenner#define TR_PROTO_MOSPF 2 9575115Sfenner#define TR_PROTO_PIM 3 9675115Sfenner#define TR_PROTO_CBT 4 9775115Sfenner 9875115Sfenner/* igmpv3 report types */ 9975115Sfennerstatic struct tok igmpv3report2str[] = { 10075115Sfenner { 1, "is_in" }, 10175115Sfenner { 2, "is_ex" }, 10275115Sfenner { 3, "to_in" }, 10375115Sfenner { 4, "to_ex" }, 10475115Sfenner { 5, "allow" }, 10575115Sfenner { 6, "block" }, 10675115Sfenner { 0, NULL } 10775115Sfenner}; 10875115Sfenner 109127668Sbmsstatic void 11075115Sfennerprint_mtrace(register const u_char *bp, register u_int len) 11175115Sfenner{ 11298524Sfenner register const struct tr_query *tr = (const struct tr_query *)(bp + 8); 11375115Sfenner 114127668Sbms TCHECK(*tr); 115127668Sbms if (len < 8 + sizeof (struct tr_query)) { 116127668Sbms (void)printf(" [invalid len %d]", len); 117127668Sbms return; 118127668Sbms } 119127668Sbms printf("mtrace %u: %s to %s reply-to %s", 120127668Sbms TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)), 12175115Sfenner ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst), 12275115Sfenner ipaddr_string(&tr->tr_raddr)); 123127668Sbms if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr))) 124127668Sbms printf(" with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid))); 125127668Sbms return; 126127668Sbmstrunc: 127127668Sbms (void)printf("[|igmp]"); 128127668Sbms return; 12975115Sfenner} 13075115Sfenner 131127668Sbmsstatic void 13275115Sfennerprint_mresp(register const u_char *bp, register u_int len) 13375115Sfenner{ 13498524Sfenner register const struct tr_query *tr = (const struct tr_query *)(bp + 8); 13575115Sfenner 136127668Sbms TCHECK(*tr); 137127668Sbms if (len < 8 + sizeof (struct tr_query)) { 138127668Sbms (void)printf(" [invalid len %d]", len); 139127668Sbms return; 140127668Sbms } 14175115Sfenner printf("mresp %lu: %s to %s reply-to %s", 142127668Sbms (u_long)TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)), 14375115Sfenner ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst), 14475115Sfenner ipaddr_string(&tr->tr_raddr)); 145127668Sbms if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr))) 146127668Sbms printf(" with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid))); 147127668Sbms return; 148127668Sbmstrunc: 149127668Sbms (void)printf("[|igmp]"); 150127668Sbms return; 15175115Sfenner} 15275115Sfenner 153127668Sbmsstatic void 15498524Sfennerprint_igmpv3_report(register const u_char *bp, register u_int len) 15575115Sfenner{ 15698524Sfenner u_int group, nsrcs, ngroups; 15798524Sfenner register u_int i, j; 15875115Sfenner 15975115Sfenner /* Minimum len is 16, and should be a multiple of 4 */ 16075115Sfenner if (len < 16 || len & 0x03) { 161127668Sbms (void)printf(" [invalid len %d]", len); 162127668Sbms return; 16375115Sfenner } 16475115Sfenner TCHECK2(bp[6], 2); 16575115Sfenner ngroups = EXTRACT_16BITS(&bp[6]); 166127668Sbms (void)printf(", %d group record(s)", ngroups); 16775115Sfenner if (vflag > 0) { 16875115Sfenner /* Print the group records */ 169127668Sbms group = 8; 17075115Sfenner for (i=0; i<ngroups; i++) { 17175115Sfenner if (len < group+8) { 17275115Sfenner (void)printf(" [invalid number of groups]"); 17375115Sfenner return; 17475115Sfenner } 17575115Sfenner TCHECK2(bp[group+4], 4); 17675115Sfenner (void)printf(" [gaddr %s", ipaddr_string(&bp[group+4])); 17775115Sfenner (void)printf(" %s", tok2str(igmpv3report2str, " [v3-report-#%d]", 17875115Sfenner bp[group])); 17975115Sfenner nsrcs = EXTRACT_16BITS(&bp[group+2]); 18075115Sfenner /* Check the number of sources and print them */ 18175115Sfenner if (len < group+8+(nsrcs<<2)) { 18275115Sfenner (void)printf(" [invalid number of sources %d]", nsrcs); 18375115Sfenner return; 18475115Sfenner } 18575115Sfenner if (vflag == 1) 18675115Sfenner (void)printf(", %d source(s)", nsrcs); 18775115Sfenner else { 18875115Sfenner /* Print the sources */ 18975115Sfenner (void)printf(" {"); 19075115Sfenner for (j=0; j<nsrcs; j++) { 19175115Sfenner TCHECK2(bp[group+8+(j<<2)], 4); 19275115Sfenner (void)printf(" %s", ipaddr_string(&bp[group+8+(j<<2)])); 19375115Sfenner } 19475115Sfenner (void)printf(" }"); 19575115Sfenner } 19675115Sfenner /* Next group record */ 19775115Sfenner group += 8 + (nsrcs << 2); 19875115Sfenner (void)printf("]"); 19975115Sfenner } 20075115Sfenner } 20175115Sfenner return; 20275115Sfennertrunc: 20375115Sfenner (void)printf("[|igmp]"); 20475115Sfenner return; 20575115Sfenner} 20675115Sfenner 20775115Sfennerstatic void 20898524Sfennerprint_igmpv3_query(register const u_char *bp, register u_int len) 20975115Sfenner{ 21098524Sfenner u_int mrc; 21198524Sfenner int mrt; 21298524Sfenner u_int nsrcs; 21398524Sfenner register u_int i; 21475115Sfenner 21575115Sfenner (void)printf(" v3"); 21675115Sfenner /* Minimum len is 12, and should be a multiple of 4 */ 21775115Sfenner if (len < 12 || len & 0x03) { 218127668Sbms (void)printf(" [invalid len %d]", len); 219127668Sbms return; 22075115Sfenner } 221127668Sbms TCHECK(bp[1]); 22298524Sfenner mrc = bp[1]; 22398524Sfenner if (mrc < 128) { 22498524Sfenner mrt = mrc; 22598524Sfenner } else { 22698524Sfenner mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3); 22798524Sfenner } 22898524Sfenner if (mrc != 100) { 22998524Sfenner (void)printf(" [max resp time "); 23098524Sfenner relts_print(mrt); 23198524Sfenner (void)printf("]"); 23298524Sfenner } 23375115Sfenner TCHECK2(bp[4], 4); 23475115Sfenner if (EXTRACT_32BITS(&bp[4]) == 0) 23575115Sfenner return; 23675115Sfenner (void)printf(" [gaddr %s", ipaddr_string(&bp[4])); 23775115Sfenner TCHECK2(bp[10], 2); 23875115Sfenner nsrcs = EXTRACT_16BITS(&bp[10]); 23975115Sfenner if (nsrcs > 0) { 24075115Sfenner if (len < 12 + (nsrcs << 2)) 24175115Sfenner (void)printf(" [invalid number of sources]"); 24275115Sfenner else if (vflag > 1) { 24375115Sfenner (void)printf(" {"); 24475115Sfenner for (i=0; i<nsrcs; i++) { 24575115Sfenner TCHECK2(bp[12+(i<<2)], 4); 24675115Sfenner (void)printf(" %s", ipaddr_string(&bp[12+(i<<2)])); 24775115Sfenner } 24875115Sfenner (void)printf(" }"); 24975115Sfenner } else 25075115Sfenner (void)printf(", %d source(s)", nsrcs); 25175115Sfenner } 25275115Sfenner (void)printf("]"); 25375115Sfenner return; 25475115Sfennertrunc: 25575115Sfenner (void)printf("[|igmp]"); 25675115Sfenner return; 25775115Sfenner} 25875115Sfenner 25975115Sfennervoid 26098524Sfennerigmp_print(register const u_char *bp, register u_int len) 26175115Sfenner{ 26275115Sfenner if (qflag) { 26375115Sfenner (void)printf("igmp"); 26475115Sfenner return; 26575115Sfenner } 26675115Sfenner 267127668Sbms TCHECK(bp[0]); 26875115Sfenner switch (bp[0]) { 26975115Sfenner case 0x11: 27075115Sfenner (void)printf("igmp query"); 27175115Sfenner if (len >= 12) 27298524Sfenner print_igmpv3_query(bp, len); 27375115Sfenner else { 274127668Sbms TCHECK(bp[1]); 27575115Sfenner if (bp[1]) { 27675115Sfenner (void)printf(" v2"); 27775115Sfenner if (bp[1] != 100) 27875115Sfenner (void)printf(" [max resp time %d]", bp[1]); 27975115Sfenner } else 28075115Sfenner (void)printf(" v1"); 281127668Sbms TCHECK2(bp[4], 4); 282127668Sbms if (EXTRACT_32BITS(&bp[4])) 28375115Sfenner (void)printf(" [gaddr %s]", ipaddr_string(&bp[4])); 28475115Sfenner if (len != 8) 28575115Sfenner (void)printf(" [len %d]", len); 28675115Sfenner } 28775115Sfenner break; 28875115Sfenner case 0x12: 289127668Sbms TCHECK2(bp[4], 4); 29075115Sfenner (void)printf("igmp v1 report %s", ipaddr_string(&bp[4])); 29175115Sfenner if (len != 8) 29275115Sfenner (void)printf(" [len %d]", len); 29375115Sfenner break; 29475115Sfenner case 0x16: 295127668Sbms TCHECK2(bp[4], 4); 29675115Sfenner (void)printf("igmp v2 report %s", ipaddr_string(&bp[4])); 29775115Sfenner break; 29875115Sfenner case 0x22: 29975115Sfenner (void)printf("igmp v3 report"); 30098524Sfenner print_igmpv3_report(bp, len); 30175115Sfenner break; 30275115Sfenner case 0x17: 30375115Sfenner (void)printf("igmp leave %s", ipaddr_string(&bp[4])); 30475115Sfenner break; 30575115Sfenner case 0x13: 30675115Sfenner (void)printf("igmp dvmrp"); 30775115Sfenner if (len < 8) 30875115Sfenner (void)printf(" [len %d]", len); 30975115Sfenner else 31075115Sfenner dvmrp_print(bp, len); 31175115Sfenner break; 31275115Sfenner case 0x14: 31375115Sfenner (void)printf("igmp pimv1"); 31475115Sfenner pimv1_print(bp, len); 31575115Sfenner break; 31675115Sfenner case 0x1e: 31775115Sfenner print_mresp(bp, len); 31875115Sfenner break; 31975115Sfenner case 0x1f: 32075115Sfenner print_mtrace(bp, len); 32175115Sfenner break; 32275115Sfenner default: 32375115Sfenner (void)printf("igmp-%d", bp[0]); 32475115Sfenner break; 32575115Sfenner } 32675115Sfenner 32775115Sfenner if (vflag && TTEST2(bp[0], len)) { 32875115Sfenner /* Check the IGMP checksum */ 32975115Sfenner if (in_cksum((const u_short*)bp, len, 0)) 33075115Sfenner printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2])); 33175115Sfenner } 33275115Sfenner return; 33375115Sfennertrunc: 33475115Sfenner fputs("[|igmp]", stdout); 33575115Sfenner} 336