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 22313537Sglebius/* \summary: Internet Group Management Protocol (IGMP) printer */ 23313537Sglebius 2475115Sfenner#ifdef HAVE_CONFIG_H 2575115Sfenner#include "config.h" 2675115Sfenner#endif 2775115Sfenner 28313537Sglebius#include <netdissect-stdinc.h> 2975115Sfenner 30313537Sglebius#include "netdissect.h" 3175115Sfenner#include "addrtoname.h" 32313537Sglebius#include "extract.h" 3375115Sfenner 3475115Sfenner#ifndef IN_CLASSD 3575115Sfenner#define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000) 3675115Sfenner#endif 3775115Sfenner 38276788Sdelphijstatic const char tstr[] = "[|igmp]"; 39276788Sdelphij 4075115Sfenner/* (following from ipmulti/mrouted/prune.h) */ 4175115Sfenner 4275115Sfenner/* 4375115Sfenner * The packet format for a traceroute request. 4475115Sfenner */ 4575115Sfennerstruct tr_query { 46276788Sdelphij uint32_t tr_src; /* traceroute source */ 47276788Sdelphij uint32_t tr_dst; /* traceroute destination */ 48276788Sdelphij uint32_t tr_raddr; /* traceroute response address */ 49276788Sdelphij uint32_t tr_rttlqid; /* response ttl and qid */ 5075115Sfenner}; 5175115Sfenner 5275115Sfenner#define TR_GETTTL(x) (int)(((x) >> 24) & 0xff) 5375115Sfenner#define TR_GETQID(x) ((x) & 0x00ffffff) 5475115Sfenner 5575115Sfenner/* 5675115Sfenner * Traceroute response format. A traceroute response has a tr_query at the 5775115Sfenner * beginning, followed by one tr_resp for each hop taken. 5875115Sfenner */ 5975115Sfennerstruct tr_resp { 60276788Sdelphij uint32_t tr_qarr; /* query arrival time */ 61276788Sdelphij uint32_t tr_inaddr; /* incoming interface address */ 62276788Sdelphij uint32_t tr_outaddr; /* outgoing interface address */ 63276788Sdelphij uint32_t tr_rmtaddr; /* parent address in source tree */ 64276788Sdelphij uint32_t tr_vifin; /* input packet count on interface */ 65276788Sdelphij uint32_t tr_vifout; /* output packet count on interface */ 66276788Sdelphij uint32_t tr_pktcnt; /* total incoming packets for src-grp */ 67276788Sdelphij uint8_t tr_rproto; /* routing proto deployed on router */ 68276788Sdelphij uint8_t tr_fttl; /* ttl required to forward on outvif */ 69276788Sdelphij uint8_t tr_smask; /* subnet mask for src addr */ 70276788Sdelphij uint8_t tr_rflags; /* forwarding error codes */ 7175115Sfenner}; 7275115Sfenner 7375115Sfenner/* defs within mtrace */ 7475115Sfenner#define TR_QUERY 1 7575115Sfenner#define TR_RESP 2 7675115Sfenner 7775115Sfenner/* fields for tr_rflags (forwarding error codes) */ 7875115Sfenner#define TR_NO_ERR 0 7975115Sfenner#define TR_WRONG_IF 1 8075115Sfenner#define TR_PRUNED 2 8175115Sfenner#define TR_OPRUNED 3 8275115Sfenner#define TR_SCOPED 4 8375115Sfenner#define TR_NO_RTE 5 8475115Sfenner#define TR_NO_FWD 7 8575115Sfenner#define TR_NO_SPACE 0x81 8675115Sfenner#define TR_OLD_ROUTER 0x82 8775115Sfenner 8875115Sfenner/* fields for tr_rproto (routing protocol) */ 8975115Sfenner#define TR_PROTO_DVMRP 1 9075115Sfenner#define TR_PROTO_MOSPF 2 9175115Sfenner#define TR_PROTO_PIM 3 9275115Sfenner#define TR_PROTO_CBT 4 9375115Sfenner 9475115Sfenner/* igmpv3 report types */ 95276788Sdelphijstatic const struct tok igmpv3report2str[] = { 9675115Sfenner { 1, "is_in" }, 9775115Sfenner { 2, "is_ex" }, 9875115Sfenner { 3, "to_in" }, 9975115Sfenner { 4, "to_ex" }, 10075115Sfenner { 5, "allow" }, 10175115Sfenner { 6, "block" }, 10275115Sfenner { 0, NULL } 10375115Sfenner}; 10475115Sfenner 105127668Sbmsstatic void 106276788Sdelphijprint_mtrace(netdissect_options *ndo, 107276788Sdelphij register const u_char *bp, register u_int len) 10875115Sfenner{ 10998524Sfenner register const struct tr_query *tr = (const struct tr_query *)(bp + 8); 11075115Sfenner 111276788Sdelphij ND_TCHECK(*tr); 112127668Sbms if (len < 8 + sizeof (struct tr_query)) { 113276788Sdelphij ND_PRINT((ndo, " [invalid len %d]", len)); 114127668Sbms return; 115127668Sbms } 116276788Sdelphij ND_PRINT((ndo, "mtrace %u: %s to %s reply-to %s", 117127668Sbms TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)), 118276788Sdelphij ipaddr_string(ndo, &tr->tr_src), ipaddr_string(ndo, &tr->tr_dst), 119276788Sdelphij ipaddr_string(ndo, &tr->tr_raddr))); 120127668Sbms if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr))) 121276788Sdelphij ND_PRINT((ndo, " with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid)))); 122127668Sbms return; 123127668Sbmstrunc: 124276788Sdelphij ND_PRINT((ndo, "%s", tstr)); 12575115Sfenner} 12675115Sfenner 127127668Sbmsstatic void 128276788Sdelphijprint_mresp(netdissect_options *ndo, 129276788Sdelphij register const u_char *bp, register u_int len) 13075115Sfenner{ 13198524Sfenner register const struct tr_query *tr = (const struct tr_query *)(bp + 8); 13275115Sfenner 133276788Sdelphij ND_TCHECK(*tr); 134127668Sbms if (len < 8 + sizeof (struct tr_query)) { 135276788Sdelphij ND_PRINT((ndo, " [invalid len %d]", len)); 136127668Sbms return; 137127668Sbms } 138276788Sdelphij ND_PRINT((ndo, "mresp %lu: %s to %s reply-to %s", 139127668Sbms (u_long)TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)), 140276788Sdelphij ipaddr_string(ndo, &tr->tr_src), ipaddr_string(ndo, &tr->tr_dst), 141276788Sdelphij ipaddr_string(ndo, &tr->tr_raddr))); 142127668Sbms if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr))) 143276788Sdelphij ND_PRINT((ndo, " with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid)))); 144127668Sbms return; 145127668Sbmstrunc: 146276788Sdelphij ND_PRINT((ndo, "%s", tstr)); 14775115Sfenner} 14875115Sfenner 149127668Sbmsstatic void 150276788Sdelphijprint_igmpv3_report(netdissect_options *ndo, 151276788Sdelphij register const u_char *bp, register u_int len) 15275115Sfenner{ 15398524Sfenner u_int group, nsrcs, ngroups; 15498524Sfenner register u_int i, j; 15575115Sfenner 15675115Sfenner /* Minimum len is 16, and should be a multiple of 4 */ 15775115Sfenner if (len < 16 || len & 0x03) { 158276788Sdelphij ND_PRINT((ndo, " [invalid len %d]", len)); 159127668Sbms return; 16075115Sfenner } 161276788Sdelphij ND_TCHECK2(bp[6], 2); 16275115Sfenner ngroups = EXTRACT_16BITS(&bp[6]); 163276788Sdelphij ND_PRINT((ndo, ", %d group record(s)", ngroups)); 164276788Sdelphij if (ndo->ndo_vflag > 0) { 16575115Sfenner /* Print the group records */ 166127668Sbms group = 8; 16775115Sfenner for (i=0; i<ngroups; i++) { 16875115Sfenner if (len < group+8) { 169276788Sdelphij ND_PRINT((ndo, " [invalid number of groups]")); 17075115Sfenner return; 17175115Sfenner } 172276788Sdelphij ND_TCHECK2(bp[group+4], 4); 173276788Sdelphij ND_PRINT((ndo, " [gaddr %s", ipaddr_string(ndo, &bp[group+4]))); 174276788Sdelphij ND_PRINT((ndo, " %s", tok2str(igmpv3report2str, " [v3-report-#%d]", 175276788Sdelphij bp[group]))); 17675115Sfenner nsrcs = EXTRACT_16BITS(&bp[group+2]); 17775115Sfenner /* Check the number of sources and print them */ 17875115Sfenner if (len < group+8+(nsrcs<<2)) { 179276788Sdelphij ND_PRINT((ndo, " [invalid number of sources %d]", nsrcs)); 18075115Sfenner return; 18175115Sfenner } 182276788Sdelphij if (ndo->ndo_vflag == 1) 183276788Sdelphij ND_PRINT((ndo, ", %d source(s)", nsrcs)); 18475115Sfenner else { 18575115Sfenner /* Print the sources */ 186276788Sdelphij ND_PRINT((ndo, " {")); 18775115Sfenner for (j=0; j<nsrcs; j++) { 188276788Sdelphij ND_TCHECK2(bp[group+8+(j<<2)], 4); 189276788Sdelphij ND_PRINT((ndo, " %s", ipaddr_string(ndo, &bp[group+8+(j<<2)]))); 19075115Sfenner } 191276788Sdelphij ND_PRINT((ndo, " }")); 19275115Sfenner } 19375115Sfenner /* Next group record */ 19475115Sfenner group += 8 + (nsrcs << 2); 195276788Sdelphij ND_PRINT((ndo, "]")); 19675115Sfenner } 19775115Sfenner } 19875115Sfenner return; 19975115Sfennertrunc: 200276788Sdelphij ND_PRINT((ndo, "%s", tstr)); 20175115Sfenner} 20275115Sfenner 20375115Sfennerstatic void 204276788Sdelphijprint_igmpv3_query(netdissect_options *ndo, 205276788Sdelphij register const u_char *bp, register u_int len) 20675115Sfenner{ 20798524Sfenner u_int mrc; 208313537Sglebius u_int mrt; 20998524Sfenner u_int nsrcs; 21098524Sfenner register u_int i; 21175115Sfenner 212276788Sdelphij ND_PRINT((ndo, " v3")); 21375115Sfenner /* Minimum len is 12, and should be a multiple of 4 */ 21475115Sfenner if (len < 12 || len & 0x03) { 215276788Sdelphij ND_PRINT((ndo, " [invalid len %d]", len)); 216127668Sbms return; 21775115Sfenner } 218276788Sdelphij ND_TCHECK(bp[1]); 21998524Sfenner mrc = bp[1]; 22098524Sfenner if (mrc < 128) { 22198524Sfenner mrt = mrc; 22298524Sfenner } else { 22398524Sfenner mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3); 22498524Sfenner } 22598524Sfenner if (mrc != 100) { 226276788Sdelphij ND_PRINT((ndo, " [max resp time ")); 227241235Sdelphij if (mrt < 600) { 228276788Sdelphij ND_PRINT((ndo, "%.1fs", mrt * 0.1)); 229241235Sdelphij } else { 230313537Sglebius unsigned_relts_print(ndo, mrt / 10); 231241235Sdelphij } 232276788Sdelphij ND_PRINT((ndo, "]")); 23398524Sfenner } 234276788Sdelphij ND_TCHECK2(bp[4], 4); 23575115Sfenner if (EXTRACT_32BITS(&bp[4]) == 0) 23675115Sfenner return; 237276788Sdelphij ND_PRINT((ndo, " [gaddr %s", ipaddr_string(ndo, &bp[4]))); 238276788Sdelphij ND_TCHECK2(bp[10], 2); 23975115Sfenner nsrcs = EXTRACT_16BITS(&bp[10]); 24075115Sfenner if (nsrcs > 0) { 24175115Sfenner if (len < 12 + (nsrcs << 2)) 242276788Sdelphij ND_PRINT((ndo, " [invalid number of sources]")); 243276788Sdelphij else if (ndo->ndo_vflag > 1) { 244276788Sdelphij ND_PRINT((ndo, " {")); 24575115Sfenner for (i=0; i<nsrcs; i++) { 246276788Sdelphij ND_TCHECK2(bp[12+(i<<2)], 4); 247276788Sdelphij ND_PRINT((ndo, " %s", ipaddr_string(ndo, &bp[12+(i<<2)]))); 24875115Sfenner } 249276788Sdelphij ND_PRINT((ndo, " }")); 25075115Sfenner } else 251276788Sdelphij ND_PRINT((ndo, ", %d source(s)", nsrcs)); 25275115Sfenner } 253276788Sdelphij ND_PRINT((ndo, "]")); 25475115Sfenner return; 25575115Sfennertrunc: 256276788Sdelphij ND_PRINT((ndo, "%s", tstr)); 25775115Sfenner} 25875115Sfenner 25975115Sfennervoid 260276788Sdelphijigmp_print(netdissect_options *ndo, 261276788Sdelphij register const u_char *bp, register u_int len) 26275115Sfenner{ 263235530Sdelphij struct cksum_vec vec[1]; 264235530Sdelphij 265276788Sdelphij if (ndo->ndo_qflag) { 266276788Sdelphij ND_PRINT((ndo, "igmp")); 26775115Sfenner return; 26875115Sfenner } 26975115Sfenner 270276788Sdelphij ND_TCHECK(bp[0]); 27175115Sfenner switch (bp[0]) { 27275115Sfenner case 0x11: 273276788Sdelphij ND_PRINT((ndo, "igmp query")); 27475115Sfenner if (len >= 12) 275276788Sdelphij print_igmpv3_query(ndo, bp, len); 27675115Sfenner else { 277276788Sdelphij ND_TCHECK(bp[1]); 27875115Sfenner if (bp[1]) { 279276788Sdelphij ND_PRINT((ndo, " v2")); 28075115Sfenner if (bp[1] != 100) 281276788Sdelphij ND_PRINT((ndo, " [max resp time %d]", bp[1])); 28275115Sfenner } else 283276788Sdelphij ND_PRINT((ndo, " v1")); 284276788Sdelphij ND_TCHECK2(bp[4], 4); 285127668Sbms if (EXTRACT_32BITS(&bp[4])) 286276788Sdelphij ND_PRINT((ndo, " [gaddr %s]", ipaddr_string(ndo, &bp[4]))); 28775115Sfenner if (len != 8) 288276788Sdelphij ND_PRINT((ndo, " [len %d]", len)); 28975115Sfenner } 29075115Sfenner break; 29175115Sfenner case 0x12: 292276788Sdelphij ND_TCHECK2(bp[4], 4); 293276788Sdelphij ND_PRINT((ndo, "igmp v1 report %s", ipaddr_string(ndo, &bp[4]))); 29475115Sfenner if (len != 8) 295276788Sdelphij ND_PRINT((ndo, " [len %d]", len)); 29675115Sfenner break; 29775115Sfenner case 0x16: 298276788Sdelphij ND_TCHECK2(bp[4], 4); 299276788Sdelphij ND_PRINT((ndo, "igmp v2 report %s", ipaddr_string(ndo, &bp[4]))); 30075115Sfenner break; 30175115Sfenner case 0x22: 302276788Sdelphij ND_PRINT((ndo, "igmp v3 report")); 303276788Sdelphij print_igmpv3_report(ndo, bp, len); 30475115Sfenner break; 30575115Sfenner case 0x17: 306276788Sdelphij ND_TCHECK2(bp[4], 4); 307276788Sdelphij ND_PRINT((ndo, "igmp leave %s", ipaddr_string(ndo, &bp[4]))); 30875115Sfenner break; 30975115Sfenner case 0x13: 310276788Sdelphij ND_PRINT((ndo, "igmp dvmrp")); 31175115Sfenner if (len < 8) 312276788Sdelphij ND_PRINT((ndo, " [len %d]", len)); 31375115Sfenner else 314276788Sdelphij dvmrp_print(ndo, bp, len); 31575115Sfenner break; 31675115Sfenner case 0x14: 317276788Sdelphij ND_PRINT((ndo, "igmp pimv1")); 318276788Sdelphij pimv1_print(ndo, bp, len); 31975115Sfenner break; 32075115Sfenner case 0x1e: 321276788Sdelphij print_mresp(ndo, bp, len); 32275115Sfenner break; 32375115Sfenner case 0x1f: 324276788Sdelphij print_mtrace(ndo, bp, len); 32575115Sfenner break; 32675115Sfenner default: 327276788Sdelphij ND_PRINT((ndo, "igmp-%d", bp[0])); 32875115Sfenner break; 32975115Sfenner } 33075115Sfenner 331313537Sglebius if (ndo->ndo_vflag && len >= 4 && ND_TTEST2(bp[0], len)) { 33275115Sfenner /* Check the IGMP checksum */ 333235530Sdelphij vec[0].ptr = bp; 334235530Sdelphij vec[0].len = len; 335235530Sdelphij if (in_cksum(vec, 1)) 336276788Sdelphij ND_PRINT((ndo, " bad igmp cksum %x!", EXTRACT_16BITS(&bp[2]))); 33775115Sfenner } 33875115Sfenner return; 33975115Sfennertrunc: 340276788Sdelphij ND_PRINT((ndo, "%s", tstr)); 34175115Sfenner} 342