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