Based on RFC3488. This is a setup for RGMP dissection, a simple protocol bolted on IGMP.

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diff --git a/epan/dissectors/packet-rgmp.c b/epan/dissectors/packet-rgmp.c
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+/* packet-rgmp.c
+ * Routines for IGMP/RGMP packet disassembly
+ * Copyright 2006 Jaap Keuter
+ *
+ * $Id$
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+/* 
+ Based on RFC3488 
+
+ This is a setup for RGMP dissection, a simple protocol bolted on IGMP.
+ The trick is to have IGMP dissector call this function (which by itself is not
+ registered as dissector). IGAP and other do the same.
+
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <glib.h>
+#include <epan/packet.h>
+#include <epan/strutil.h>
+#include "packet-igmp.h"
+#include "packet-rgmp.h"
+
+
+static int proto_rgmp      = -1;
+static int hf_type         = -1;
+static int hf_checksum     = -1;
+static int hf_checksum_bad = -1;
+static int hf_maddr        = -1;
+
+static int ett_rgmp = -1;
+
+static const value_string rgmp_types[] = {
+    {IGMP_RGMP_LEAVE, "Leave"},
+    {IGMP_RGMP_JOIN,  "Join"},
+    {IGMP_RGMP_BYE,   "Bye"},
+    {IGMP_RGMP_HELLO, "Hello"},
+    {0, NULL}
+};
+
+/* This function is only called from the IGMP dissector */
+int
+dissect_rgmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
+{
+    proto_tree *tree;
+    proto_item *item;
+    guint8 type;
+
+    if (!proto_is_protocol_enabled(find_protocol_by_id(proto_rgmp))) {
+	/* we are not enabled, skip entire packet to be nice
+	   to the igmp layer. (so clicking on IGMP will display the data)
+	   */
+	return offset + tvb_length_remaining(tvb, offset);
+    }
+
+    item = proto_tree_add_item(parent_tree, proto_rgmp, tvb, offset, -1, FALSE);
+    tree = proto_item_add_subtree(item, ett_rgmp);
+
+    if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
+	col_set_str(pinfo->cinfo, COL_PROTOCOL, "RGMP");
+    }
+    if (check_col(pinfo->cinfo, COL_INFO)) {
+	col_clear(pinfo->cinfo, COL_INFO);
+    }
+
+    type = tvb_get_guint8(tvb, offset);
+    if (check_col(pinfo->cinfo, COL_INFO)) {
+	col_add_fstr(pinfo->cinfo, COL_INFO, "%s",
+		     val_to_str(type, rgmp_types, "Unknown Type: 0x%02x"));
+    }
+    proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
+    offset += 1;
+
+    /* reserved */
+
+    offset += 1;
+
+    igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
+    offset += 2;
+
+    proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, FALSE);
+    offset += 4;
+
+    return offset;
+}
+
+
+void
+proto_register_rgmp(void)
+{
+    static hf_register_info hf[] = {
+	{ &hf_type,
+	  { "Type", "rgmp.type", FT_UINT8, BASE_HEX,
+	    VALS(rgmp_types), 0, "RGMP Packet Type", HFILL }
+	},
+
+	{ &hf_checksum,
+	  { "Checksum", "rgmp.checksum", FT_UINT16, BASE_HEX,
+	    NULL, 0, "Checksum", HFILL }
+	},
+
+	{ &hf_checksum_bad,
+	  { "Bad Checksum", "rgmp.checksum_bad", FT_BOOLEAN, BASE_NONE,
+	    NULL, 0, "Bad Checksum", HFILL }
+	},
+
+	{ &hf_maddr,
+	  { "Multicast group address", "rgmp.maddr", FT_IPv4, BASE_NONE,
+	    NULL, 0, "Multicast group address", HFILL }
+	}
+    };
+
+    static gint *ett[] = {
+	&ett_rgmp
+    };
+
+    proto_rgmp = proto_register_protocol
+	("Router-port Group Management Protocol", "RGMP", "rgmp");
+    proto_register_field_array(proto_rgmp, hf, array_length(hf));
+    proto_register_subtree_array(ett, array_length(ett));
+}