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-rw-r--r--print-igmp.c301
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diff --git a/print-igmp.c b/print-igmp.c
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+/*
+ * 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 */
+
+/*
+ * specification:
+ *
+ * RFC 2236 for IGMPv2
+ * RFC 3376 for IGMPv3
+ * draft-asaeda-mboned-mtrace-v2 for the mtrace message
+ */
+
+#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
+
+
+/* (following from ipmulti/mrouted/prune.h) */
+
+/*
+ * The packet format for a traceroute request.
+ */
+struct tr_query {
+ nd_uint32_t tr_src; /* traceroute source */
+ nd_uint32_t tr_dst; /* traceroute destination */
+ nd_uint32_t tr_raddr; /* traceroute response address */
+ nd_uint8_t tr_rttl; /* response ttl */
+ nd_uint24_t tr_qid; /* qid */
+};
+
+/*
+ * 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 {
+ nd_uint32_t tr_qarr; /* query arrival time */
+ nd_uint32_t tr_inaddr; /* incoming interface address */
+ nd_uint32_t tr_outaddr; /* outgoing interface address */
+ nd_uint32_t tr_rmtaddr; /* parent address in source tree */
+ nd_uint32_t tr_vifin; /* input packet count on interface */
+ nd_uint32_t tr_vifout; /* output packet count on interface */
+ nd_uint32_t tr_pktcnt; /* total incoming packets for src-grp */
+ nd_uint8_t tr_rproto; /* routing proto deployed on router */
+ nd_uint8_t tr_fttl; /* ttl required to forward on outvif */
+ nd_uint8_t tr_smask; /* subnet mask for src addr */
+ nd_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,
+ const char *typename,
+ const u_char *bp, u_int len)
+{
+ const struct tr_query *tr = (const struct tr_query *)(bp + 8);
+
+ if (len < 8 + sizeof (struct tr_query)) {
+ ND_PRINT(" [invalid len %u]", len);
+ return;
+ }
+ ND_PRINT("%s %u: %s to %s reply-to %s",
+ typename,
+ GET_BE_U_3(tr->tr_qid),
+ GET_IPADDR_STRING(tr->tr_src), GET_IPADDR_STRING(tr->tr_dst),
+ GET_IPADDR_STRING(tr->tr_raddr));
+ if (IN_CLASSD(GET_BE_U_4(tr->tr_raddr)))
+ ND_PRINT(" with-ttl %u", GET_U_1(tr->tr_rttl));
+}
+
+static void
+print_igmpv3_report(netdissect_options *ndo,
+ const u_char *bp, u_int len)
+{
+ u_int group, nsrcs, ngroups;
+ u_int i, j;
+
+ /* Minimum len is 16, and should be a multiple of 4 */
+ if (len < 16 || len & 0x03) {
+ ND_PRINT(" [invalid len %u]", len);
+ return;
+ }
+ ngroups = GET_BE_U_2(bp + 6);
+ ND_PRINT(", %u 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(" [invalid number of groups]");
+ return;
+ }
+ ND_PRINT(" [gaddr %s", GET_IPADDR_STRING(bp + group + 4));
+ ND_PRINT(" %s", tok2str(igmpv3report2str, " [v3-report-#%u]",
+ GET_U_1(bp + group)));
+ nsrcs = GET_BE_U_2(bp + group + 2);
+ /* Check the number of sources and print them */
+ if (len < group+8+(nsrcs<<2)) {
+ ND_PRINT(" [invalid number of sources %u]", nsrcs);
+ return;
+ }
+ if (ndo->ndo_vflag == 1)
+ ND_PRINT(", %u source(s)", nsrcs);
+ else {
+ /* Print the sources */
+ ND_PRINT(" {");
+ for (j=0; j<nsrcs; j++) {
+ ND_PRINT(" %s", GET_IPADDR_STRING(bp + group + 8 + (j << 2)));
+ }
+ ND_PRINT(" }");
+ }
+ /* Next group record */
+ group += 8 + (nsrcs << 2);
+ ND_PRINT("]");
+ }
+ }
+}
+
+static void
+print_igmpv3_query(netdissect_options *ndo,
+ const u_char *bp, u_int len)
+{
+ u_int mrc;
+ u_int mrt;
+ u_int nsrcs;
+ u_int i;
+
+ ND_PRINT(" v3");
+ /* Minimum len is 12, and should be a multiple of 4 */
+ if (len < 12 || len & 0x03) {
+ ND_PRINT(" [invalid len %u]", len);
+ return;
+ }
+ mrc = GET_U_1(bp + 1);
+ if (mrc < 128) {
+ mrt = mrc;
+ } else {
+ mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3);
+ }
+ if (mrc != 100) {
+ ND_PRINT(" [max resp time ");
+ if (mrt < 600) {
+ ND_PRINT("%.1fs", mrt * 0.1);
+ } else {
+ unsigned_relts_print(ndo, mrt / 10);
+ }
+ ND_PRINT("]");
+ }
+ if (GET_BE_U_4(bp + 4) == 0)
+ return;
+ ND_PRINT(" [gaddr %s", GET_IPADDR_STRING(bp + 4));
+ nsrcs = GET_BE_U_2(bp + 10);
+ if (nsrcs > 0) {
+ if (len < 12 + (nsrcs << 2))
+ ND_PRINT(" [invalid number of sources]");
+ else if (ndo->ndo_vflag > 1) {
+ ND_PRINT(" {");
+ for (i=0; i<nsrcs; i++) {
+ ND_PRINT(" %s", GET_IPADDR_STRING(bp + 12 + (i << 2)));
+ }
+ ND_PRINT(" }");
+ } else
+ ND_PRINT(", %u source(s)", nsrcs);
+ }
+ ND_PRINT("]");
+}
+
+void
+igmp_print(netdissect_options *ndo,
+ const u_char *bp, u_int len)
+{
+ struct cksum_vec vec[1];
+
+ ndo->ndo_protocol = "igmp";
+ if (ndo->ndo_qflag) {
+ ND_PRINT("igmp");
+ return;
+ }
+
+ switch (GET_U_1(bp)) {
+ case 0x11:
+ ND_PRINT("igmp query");
+ if (len >= 12)
+ print_igmpv3_query(ndo, bp, len);
+ else {
+ if (GET_U_1(bp + 1)) {
+ ND_PRINT(" v2");
+ if (GET_U_1(bp + 1) != 100)
+ ND_PRINT(" [max resp time %u]", GET_U_1(bp + 1));
+ } else
+ ND_PRINT(" v1");
+ if (GET_BE_U_4(bp + 4))
+ ND_PRINT(" [gaddr %s]", GET_IPADDR_STRING(bp + 4));
+ if (len != 8)
+ ND_PRINT(" [len %u]", len);
+ }
+ break;
+ case 0x12:
+ ND_PRINT("igmp v1 report %s", GET_IPADDR_STRING(bp + 4));
+ if (len != 8)
+ ND_PRINT(" [len %u]", len);
+ break;
+ case 0x16:
+ ND_PRINT("igmp v2 report %s", GET_IPADDR_STRING(bp + 4));
+ break;
+ case 0x22:
+ ND_PRINT("igmp v3 report");
+ print_igmpv3_report(ndo, bp, len);
+ break;
+ case 0x17:
+ ND_PRINT("igmp leave %s", GET_IPADDR_STRING(bp + 4));
+ break;
+ case 0x13:
+ ND_PRINT("igmp dvmrp");
+ if (len < 8)
+ ND_PRINT(" [len %u]", len);
+ else
+ dvmrp_print(ndo, bp, len);
+ break;
+ case 0x14:
+ ND_PRINT("igmp pimv1");
+ pimv1_print(ndo, bp, len);
+ break;
+ case 0x1e:
+ print_mtrace(ndo, "mresp", bp, len);
+ break;
+ case 0x1f:
+ print_mtrace(ndo, "mtrace", bp, len);
+ break;
+ default:
+ ND_PRINT("igmp-%u", GET_U_1(bp));
+ break;
+ }
+
+ if (ndo->ndo_vflag && len >= 4 && ND_TTEST_LEN(bp, len)) {
+ /* Check the IGMP checksum */
+ vec[0].ptr = bp;
+ vec[0].len = len;
+ if (in_cksum(vec, 1))
+ ND_PRINT(" bad igmp cksum %x!", GET_BE_U_2(bp + 2));
+ }
+}
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