1 files changed, 159 insertions, 0 deletions
diff --git a/epan/dissectors/packet-rgmp.c b/epan/dissectors/packet-rgmp.c
new file mode 100644
index 00000000..e36102aa
--- /dev/null
+++ b/epan/dissectors/packet-rgmp.c
@@ -0,0 +1,159 @@
+/* packet-rgmp.c
+ * Routines for IGMP/RGMP packet disassembly
+ * Copyright 2006 Jaap Keuter
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+/*
+ Based on RFC3488
+
+ This is a setup for RGMP dissection, a simple protocol bolted on IGMP.
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/expert.h>
+#include "packet-igmp.h"
+
+void proto_register_rgmp(void);
+void proto_reg_handoff_rgmp(void);
+
+static int proto_rgmp      = -1;
+static int hf_type         = -1;
+static int hf_reserved     = -1;
+static int hf_checksum     = -1;
+static int hf_checksum_status = -1;
+static int hf_maddr        = -1;
+
+static int ett_rgmp = -1;
+
+static expert_field ei_checksum = EI_INIT;
+
+static dissector_handle_t rgmp_handle;
+
+#define MC_RGMP 0xe0000019
+
+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 */
+static int
+dissect_rgmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data _U_)
+{
+    proto_tree *tree;
+    proto_item *item;
+    guint8 type;
+    int offset = 0;
+    guint32 dst = g_htonl(MC_RGMP);
+
+    /* Shouldn't be destined for us */
+    if ((pinfo->dst.type != AT_IPv4) || memcmp(pinfo->dst.data, &dst, 4))
+        return 0;
+
+    col_set_str(pinfo->cinfo, COL_PROTOCOL, "RGMP");
+    col_clear(pinfo->cinfo, COL_INFO);
+
+    item = proto_tree_add_item(parent_tree, proto_rgmp, tvb, offset, -1, ENC_NA);
+    tree = proto_item_add_subtree(item, ett_rgmp);
+
+    type = tvb_get_guint8(tvb, offset);
+    col_add_str(pinfo->cinfo, COL_INFO,
+                val_to_str(type, rgmp_types, "Unknown Type: 0x%02x"));
+    proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
+    offset += 1;
+
+    /* reserved */
+    proto_tree_add_item(tree, hf_reserved, tvb, offset, 1, ENC_NA);
+    offset += 1;
+
+    igmp_checksum(tree, tvb, hf_checksum, hf_checksum_status, &ei_checksum, pinfo, 0);
+    offset += 2;
+
+    proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, ENC_BIG_ENDIAN);
+    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_reserved,
+          { "Reserved", "rgmp.reserved", FT_UINT8, BASE_HEX,
+            NULL, 0, "RGMP Reserved", HFILL }
+        },
+
+        { &hf_checksum,
+          { "Checksum", "rgmp.checksum", FT_UINT16, BASE_HEX,
+            NULL, 0, NULL, HFILL }
+        },
+
+        { &hf_checksum_status,
+          { "Checksum Status", "rgmp.checksum.status", FT_UINT8, BASE_NONE,
+            VALS(proto_checksum_vals), 0x0, NULL, HFILL }
+        },
+
+        { &hf_maddr,
+          { "Multicast group address", "rgmp.maddr", FT_IPv4, BASE_NONE,
+            NULL, 0, NULL, HFILL }
+        }
+    };
+
+    static gint *ett[] = {
+        &ett_rgmp
+    };
+
+    static ei_register_info ei[] = {
+        { &ei_checksum, { "rgmp.bad_checksum", PI_CHECKSUM, PI_ERROR, "Bad checksum", EXPFILL }},
+    };
+
+    expert_module_t* expert_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));
+    expert_rgmp = expert_register_protocol(proto_rgmp);
+    expert_register_field_array(expert_rgmp, ei, array_length(ei));
+
+    rgmp_handle = register_dissector("rgmp", dissect_rgmp, proto_rgmp);
+}
+
+void
+proto_reg_handoff_rgmp(void)
+{
+    dissector_add_uint("igmp.type", IGMP_RGMP_HELLO, rgmp_handle);
+    dissector_add_uint("igmp.type", IGMP_RGMP_BYE, rgmp_handle);
+    dissector_add_uint("igmp.type", IGMP_RGMP_JOIN, rgmp_handle);
+    dissector_add_uint("igmp.type", IGMP_RGMP_LEAVE, rgmp_handle);
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */