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-rw-r--r--print-igmp.c341
1 files changed, 341 insertions, 0 deletions
diff --git a/print-igmp.c b/print-igmp.c
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--- /dev/null
+++ b/print-igmp.c
@@ -0,0 +1,341 @@
+/*
+ * 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));
+}
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