341 lines
10 KiB
C
341 lines
10 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994, 1995, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#define NETDISSECT_REWORKED
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h" /* must come after interface.h */
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#ifndef IN_CLASSD
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#define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000)
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#endif
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static const char tstr[] = "[|igmp]";
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/* (following from ipmulti/mrouted/prune.h) */
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/*
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* The packet format for a traceroute request.
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*/
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struct tr_query {
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uint32_t tr_src; /* traceroute source */
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uint32_t tr_dst; /* traceroute destination */
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uint32_t tr_raddr; /* traceroute response address */
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uint32_t tr_rttlqid; /* response ttl and qid */
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};
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#define TR_GETTTL(x) (int)(((x) >> 24) & 0xff)
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#define TR_GETQID(x) ((x) & 0x00ffffff)
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/*
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* Traceroute response format. A traceroute response has a tr_query at the
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* beginning, followed by one tr_resp for each hop taken.
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*/
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struct tr_resp {
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uint32_t tr_qarr; /* query arrival time */
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uint32_t tr_inaddr; /* incoming interface address */
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uint32_t tr_outaddr; /* outgoing interface address */
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uint32_t tr_rmtaddr; /* parent address in source tree */
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uint32_t tr_vifin; /* input packet count on interface */
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uint32_t tr_vifout; /* output packet count on interface */
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uint32_t tr_pktcnt; /* total incoming packets for src-grp */
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uint8_t tr_rproto; /* routing proto deployed on router */
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uint8_t tr_fttl; /* ttl required to forward on outvif */
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uint8_t tr_smask; /* subnet mask for src addr */
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uint8_t tr_rflags; /* forwarding error codes */
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};
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/* defs within mtrace */
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#define TR_QUERY 1
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#define TR_RESP 2
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/* fields for tr_rflags (forwarding error codes) */
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#define TR_NO_ERR 0
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#define TR_WRONG_IF 1
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#define TR_PRUNED 2
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#define TR_OPRUNED 3
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#define TR_SCOPED 4
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#define TR_NO_RTE 5
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#define TR_NO_FWD 7
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#define TR_NO_SPACE 0x81
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#define TR_OLD_ROUTER 0x82
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/* fields for tr_rproto (routing protocol) */
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#define TR_PROTO_DVMRP 1
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#define TR_PROTO_MOSPF 2
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#define TR_PROTO_PIM 3
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#define TR_PROTO_CBT 4
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/* igmpv3 report types */
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static const struct tok igmpv3report2str[] = {
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{ 1, "is_in" },
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{ 2, "is_ex" },
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{ 3, "to_in" },
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{ 4, "to_ex" },
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{ 5, "allow" },
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{ 6, "block" },
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{ 0, NULL }
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};
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static void
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print_mtrace(netdissect_options *ndo,
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register const u_char *bp, register u_int len)
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{
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register const struct tr_query *tr = (const struct tr_query *)(bp + 8);
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ND_TCHECK(*tr);
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if (len < 8 + sizeof (struct tr_query)) {
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ND_PRINT((ndo, " [invalid len %d]", len));
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return;
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}
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ND_PRINT((ndo, "mtrace %u: %s to %s reply-to %s",
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TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)),
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ipaddr_string(ndo, &tr->tr_src), ipaddr_string(ndo, &tr->tr_dst),
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ipaddr_string(ndo, &tr->tr_raddr)));
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if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr)))
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ND_PRINT((ndo, " with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid))));
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return;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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}
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static void
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print_mresp(netdissect_options *ndo,
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register const u_char *bp, register u_int len)
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{
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register const struct tr_query *tr = (const struct tr_query *)(bp + 8);
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ND_TCHECK(*tr);
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if (len < 8 + sizeof (struct tr_query)) {
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ND_PRINT((ndo, " [invalid len %d]", len));
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return;
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}
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ND_PRINT((ndo, "mresp %lu: %s to %s reply-to %s",
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(u_long)TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)),
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ipaddr_string(ndo, &tr->tr_src), ipaddr_string(ndo, &tr->tr_dst),
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ipaddr_string(ndo, &tr->tr_raddr)));
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if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr)))
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ND_PRINT((ndo, " with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid))));
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return;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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}
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static void
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print_igmpv3_report(netdissect_options *ndo,
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register const u_char *bp, register u_int len)
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{
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u_int group, nsrcs, ngroups;
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register u_int i, j;
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/* Minimum len is 16, and should be a multiple of 4 */
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if (len < 16 || len & 0x03) {
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ND_PRINT((ndo, " [invalid len %d]", len));
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return;
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}
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ND_TCHECK2(bp[6], 2);
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ngroups = EXTRACT_16BITS(&bp[6]);
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ND_PRINT((ndo, ", %d group record(s)", ngroups));
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if (ndo->ndo_vflag > 0) {
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/* Print the group records */
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group = 8;
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for (i=0; i<ngroups; i++) {
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if (len < group+8) {
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ND_PRINT((ndo, " [invalid number of groups]"));
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return;
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}
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ND_TCHECK2(bp[group+4], 4);
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ND_PRINT((ndo, " [gaddr %s", ipaddr_string(ndo, &bp[group+4])));
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ND_PRINT((ndo, " %s", tok2str(igmpv3report2str, " [v3-report-#%d]",
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bp[group])));
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nsrcs = EXTRACT_16BITS(&bp[group+2]);
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/* Check the number of sources and print them */
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if (len < group+8+(nsrcs<<2)) {
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ND_PRINT((ndo, " [invalid number of sources %d]", nsrcs));
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return;
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}
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if (ndo->ndo_vflag == 1)
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ND_PRINT((ndo, ", %d source(s)", nsrcs));
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else {
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/* Print the sources */
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ND_PRINT((ndo, " {"));
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for (j=0; j<nsrcs; j++) {
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ND_TCHECK2(bp[group+8+(j<<2)], 4);
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ND_PRINT((ndo, " %s", ipaddr_string(ndo, &bp[group+8+(j<<2)])));
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}
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ND_PRINT((ndo, " }"));
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}
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/* Next group record */
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group += 8 + (nsrcs << 2);
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ND_PRINT((ndo, "]"));
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}
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}
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return;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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}
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static void
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print_igmpv3_query(netdissect_options *ndo,
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register const u_char *bp, register u_int len)
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{
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u_int mrc;
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int mrt;
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u_int nsrcs;
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register u_int i;
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ND_PRINT((ndo, " v3"));
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/* Minimum len is 12, and should be a multiple of 4 */
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if (len < 12 || len & 0x03) {
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ND_PRINT((ndo, " [invalid len %d]", len));
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return;
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}
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ND_TCHECK(bp[1]);
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mrc = bp[1];
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if (mrc < 128) {
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mrt = mrc;
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} else {
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mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3);
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}
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if (mrc != 100) {
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ND_PRINT((ndo, " [max resp time "));
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if (mrt < 600) {
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ND_PRINT((ndo, "%.1fs", mrt * 0.1));
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} else {
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relts_print(ndo, mrt / 10);
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}
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ND_PRINT((ndo, "]"));
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}
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ND_TCHECK2(bp[4], 4);
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if (EXTRACT_32BITS(&bp[4]) == 0)
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return;
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ND_PRINT((ndo, " [gaddr %s", ipaddr_string(ndo, &bp[4])));
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ND_TCHECK2(bp[10], 2);
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nsrcs = EXTRACT_16BITS(&bp[10]);
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if (nsrcs > 0) {
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if (len < 12 + (nsrcs << 2))
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ND_PRINT((ndo, " [invalid number of sources]"));
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else if (ndo->ndo_vflag > 1) {
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ND_PRINT((ndo, " {"));
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for (i=0; i<nsrcs; i++) {
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ND_TCHECK2(bp[12+(i<<2)], 4);
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ND_PRINT((ndo, " %s", ipaddr_string(ndo, &bp[12+(i<<2)])));
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}
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ND_PRINT((ndo, " }"));
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} else
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ND_PRINT((ndo, ", %d source(s)", nsrcs));
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}
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ND_PRINT((ndo, "]"));
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return;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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}
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void
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igmp_print(netdissect_options *ndo,
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register const u_char *bp, register u_int len)
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{
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struct cksum_vec vec[1];
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if (ndo->ndo_qflag) {
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ND_PRINT((ndo, "igmp"));
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return;
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}
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ND_TCHECK(bp[0]);
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switch (bp[0]) {
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case 0x11:
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ND_PRINT((ndo, "igmp query"));
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if (len >= 12)
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print_igmpv3_query(ndo, bp, len);
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else {
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ND_TCHECK(bp[1]);
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if (bp[1]) {
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ND_PRINT((ndo, " v2"));
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if (bp[1] != 100)
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ND_PRINT((ndo, " [max resp time %d]", bp[1]));
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} else
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ND_PRINT((ndo, " v1"));
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ND_TCHECK2(bp[4], 4);
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if (EXTRACT_32BITS(&bp[4]))
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ND_PRINT((ndo, " [gaddr %s]", ipaddr_string(ndo, &bp[4])));
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if (len != 8)
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ND_PRINT((ndo, " [len %d]", len));
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}
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break;
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case 0x12:
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ND_TCHECK2(bp[4], 4);
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ND_PRINT((ndo, "igmp v1 report %s", ipaddr_string(ndo, &bp[4])));
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if (len != 8)
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ND_PRINT((ndo, " [len %d]", len));
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break;
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case 0x16:
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ND_TCHECK2(bp[4], 4);
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ND_PRINT((ndo, "igmp v2 report %s", ipaddr_string(ndo, &bp[4])));
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break;
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case 0x22:
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ND_PRINT((ndo, "igmp v3 report"));
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print_igmpv3_report(ndo, bp, len);
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break;
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case 0x17:
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ND_TCHECK2(bp[4], 4);
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ND_PRINT((ndo, "igmp leave %s", ipaddr_string(ndo, &bp[4])));
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break;
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case 0x13:
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ND_PRINT((ndo, "igmp dvmrp"));
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if (len < 8)
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ND_PRINT((ndo, " [len %d]", len));
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else
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dvmrp_print(ndo, bp, len);
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break;
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case 0x14:
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ND_PRINT((ndo, "igmp pimv1"));
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pimv1_print(ndo, bp, len);
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break;
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case 0x1e:
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print_mresp(ndo, bp, len);
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break;
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case 0x1f:
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print_mtrace(ndo, bp, len);
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break;
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default:
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ND_PRINT((ndo, "igmp-%d", bp[0]));
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break;
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}
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if (ndo->ndo_vflag && ND_TTEST2(bp[0], len)) {
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/* Check the IGMP checksum */
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vec[0].ptr = bp;
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vec[0].len = len;
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if (in_cksum(vec, 1))
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ND_PRINT((ndo, " bad igmp cksum %x!", EXTRACT_16BITS(&bp[2])));
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}
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return;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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}
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