Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 293 insertions, 0 deletions

diff --git a/epan/dissectors/packet-mrdisc.c b/epan/dissectors/packet-mrdisc.c
new file mode 100644
index 00000000..778ced11
--- /dev/null
+++ b/epan/dissectors/packet-mrdisc.c
@@ -0,0 +1,293 @@
+/* packet-mrdisc.c   2001 Ronnie Sahlberg <See AUTHORS for email>
+ * Routines for IGMP/MRDISC packet disassembly
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+/*
+
+
+			MRDISC
+	code
+
+	0x24		x
+	0x25		x
+	0x26		x
+
+	MRDISC : IGMP Multicast Router DISCovery
+	Defined in draft-ietf-idmr-igmp-mrdisc-06.txt
+	TTL==1 and IP.DST==224.0.0.2 for all packets.
+*/
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/expert.h>
+
+#include "packet-igmp.h"
+
+void proto_register_mrdisc(void);
+void proto_reg_handoff_mrdisc(void);
+
+static dissector_handle_t mrdisc_handle;
+
+static int proto_mrdisc = -1;
+static int hf_checksum = -1;
+static int hf_checksum_status = -1;
+static int hf_type = -1;
+static int hf_advint = -1;
+static int hf_numopts = -1;
+static int hf_options = -1;
+static int hf_option = -1;
+static int hf_option_len = -1;
+static int hf_qi = -1;
+static int hf_rv = -1;
+static int hf_option_bytes = -1;
+
+static int ett_mrdisc = -1;
+static int ett_options = -1;
+
+static expert_field ei_checksum = EI_INIT;
+
+#define MC_ALL_ROUTERS		0xe0000002
+
+#define MRDISC_MRA	0x24
+#define MRDISC_MRS	0x25
+#define MRDISC_MRT	0x26
+static const value_string mrdisc_types[] = {
+	{MRDISC_MRA,	"Multicast Router Advertisement"},
+	{MRDISC_MRS,	"Multicast Router Solicitation"},
+	{MRDISC_MRT,	"Multicast Router Termination"},
+	{0,					NULL}
+};
+
+#define MRDISC_QI	0x01
+#define MRDISC_RV	0x02
+static const value_string mrdisc_options[] = {
+	{MRDISC_QI,	"Query Interval"},
+	{MRDISC_RV,	"Robustness Variable"},
+	{0,					NULL}
+};
+
+
+static int
+dissect_mrdisc_mra(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
+{
+	guint16 num;
+
+	/* Advertising Interval */
+	proto_tree_add_item(parent_tree, hf_advint, tvb, offset, 1, ENC_BIG_ENDIAN);
+	offset += 1;
+
+	/* checksum */
+	igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_status, &ei_checksum, pinfo, 0);
+	offset += 2;
+
+	/* skip unused bytes */
+	offset += 2;
+
+	/* number of options */
+	num = tvb_get_ntohs(tvb, offset);
+	proto_tree_add_uint(parent_tree, hf_numopts, tvb,
+		offset, 2, num);
+	offset += 2;
+
+	/* process any options */
+	while (num--) {
+		proto_tree *tree;
+		proto_item *item;
+		guint8 type,len;
+		int old_offset = offset;
+
+		item = proto_tree_add_item(parent_tree, hf_options,
+			tvb, offset, -1, ENC_NA);
+		tree = proto_item_add_subtree(item, ett_options);
+
+		type = tvb_get_guint8(tvb, offset);
+		proto_tree_add_uint(tree, hf_option, tvb, offset, 1, type);
+		offset += 1;
+
+		len = tvb_get_guint8(tvb, offset);
+		proto_tree_add_uint(tree, hf_option_len, tvb, offset, 1, len);
+		offset += 1;
+
+		switch (type) {
+		case MRDISC_QI:
+			proto_item_set_text(item,"Option: %s == %d",
+					val_to_str(type, mrdisc_options, "unknown %x"),
+					tvb_get_ntohs(tvb, offset));
+			proto_tree_add_item(tree, hf_qi, tvb, offset, len,
+				ENC_BIG_ENDIAN);
+			offset += len;
+			break;
+		case MRDISC_RV:
+			proto_item_set_text(item,"Option: %s == %d",
+					val_to_str(type, mrdisc_options, "unknown %x"),
+					tvb_get_ntohs(tvb, offset));
+			proto_tree_add_item(tree, hf_rv, tvb, offset, len,
+				ENC_BIG_ENDIAN);
+			offset += len;
+			break;
+		default:
+			proto_item_set_text(item,"Option: unknown");
+
+			proto_tree_add_item(tree, hf_option_bytes,
+				tvb, offset, len, ENC_NA);
+			offset += len;
+		}
+		proto_item_set_len(item, offset-old_offset);
+	}
+
+	return offset;
+}
+
+
+static int
+dissect_mrdisc_mrst(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
+{
+	/* skip reserved byte */
+	offset += 1;
+
+	/* checksum */
+	igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_status, &ei_checksum, pinfo, 0);
+	offset += 2;
+
+	return offset;
+}
+
+
+/* This function is only called from the IGMP dissector */
+static int
+dissect_mrdisc(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_ALL_ROUTERS);
+
+	/* 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, "MRDISC");
+	col_clear(pinfo->cinfo, COL_INFO);
+
+	item = proto_tree_add_item(parent_tree, proto_mrdisc, tvb, offset, 0, ENC_NA);
+	tree = proto_item_add_subtree(item, ett_mrdisc);
+
+	type = tvb_get_guint8(tvb, offset);
+	col_add_str(pinfo->cinfo, COL_INFO,
+			val_to_str(type, mrdisc_types,
+				"Unknown Type:0x%02x"));
+
+	/* type of command */
+	proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
+	offset += 1;
+
+	switch (type) {
+	case MRDISC_MRA:
+		offset = dissect_mrdisc_mra(tvb, pinfo, tree, offset);
+		break;
+	case MRDISC_MRS:
+	case MRDISC_MRT:
+		/* MRS and MRT packets looks the same */
+		offset = dissect_mrdisc_mrst(tvb, pinfo, tree, offset);
+		break;
+	}
+	return offset;
+}
+
+
+void
+proto_register_mrdisc(void)
+{
+	static hf_register_info hf[] = {
+		{ &hf_type,
+			{ "Type", "mrdisc.type", FT_UINT8, BASE_HEX,
+			  VALS(mrdisc_types), 0, "MRDISC Packet Type", HFILL }},
+
+		{ &hf_checksum,
+			{ "Checksum", "mrdisc.checksum", FT_UINT16, BASE_HEX,
+			  NULL, 0, "MRDISC Checksum", HFILL }},
+
+		{ &hf_checksum_status,
+			{ "Checksum Status", "mrdisc.checksum.status", FT_UINT8, BASE_NONE,
+			  VALS(proto_checksum_vals), 0x0, NULL, HFILL }},
+
+		{ &hf_advint,
+			{ "Advertising Interval", "mrdisc.adv_int", FT_UINT8, BASE_DEC,
+			  NULL, 0, "MRDISC Advertising Interval in seconds", HFILL }},
+
+		{ &hf_numopts,
+			{ "Number Of Options", "mrdisc.num_opts", FT_UINT16, BASE_DEC,
+			  NULL, 0, "MRDISC Number Of Options", HFILL }},
+
+		{ &hf_options,
+			{ "Options", "mrdisc.options", FT_NONE, BASE_NONE,
+			  NULL, 0, "MRDISC Options", HFILL }},
+
+		{ &hf_option,
+			{ "Option", "mrdisc.option", FT_UINT8, BASE_DEC,
+			  VALS(mrdisc_options), 0, "MRDISC Option Type", HFILL }},
+
+		{ &hf_option_len,
+			{ "Length", "mrdisc.opt_len", FT_UINT8, BASE_DEC,
+			  NULL, 0, "MRDISC Option Length", HFILL }},
+
+		{ &hf_qi,
+			{ "Query Interval", "mrdisc.query_int", FT_UINT16, BASE_DEC,
+			  NULL, 0, "MRDISC Query Interval", HFILL }},
+
+		{ &hf_rv,
+			{ "Robustness Variable", "mrdisc.rob_var", FT_UINT16, BASE_DEC,
+			  NULL, 0, "MRDISC Robustness Variable", HFILL }},
+
+		{ &hf_option_bytes,
+			{ "Data", "mrdisc.option_data", FT_BYTES, BASE_NONE,
+			  NULL, 0, "MRDISC Unknown Option Data", HFILL }},
+
+	};
+	static gint *ett[] = {
+		&ett_mrdisc,
+		&ett_options,
+	};
+
+	static ei_register_info ei[] = {
+		{ &ei_checksum, { "mrdisc.bad_checksum", PI_CHECKSUM, PI_ERROR, "Bad checksum", EXPFILL }},
+	};
+
+	expert_module_t* expert_mrdisc;
+
+	proto_mrdisc = proto_register_protocol("Multicast Router DISCovery protocol", "MRDISC", "mrdisc");
+	proto_register_field_array(proto_mrdisc, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+	expert_mrdisc = expert_register_protocol(proto_mrdisc);
+	expert_register_field_array(expert_mrdisc, ei, array_length(ei));
+
+	mrdisc_handle = register_dissector("mrdisc", dissect_mrdisc, proto_mrdisc);
+}
+
+void
+proto_reg_handoff_mrdisc(void)
+{
+	dissector_add_uint("igmp.type", IGMP_TYPE_0x24, mrdisc_handle);
+	dissector_add_uint("igmp.type", IGMP_TYPE_0x25, mrdisc_handle);
+	dissector_add_uint("igmp.type", IGMP_TYPE_0x26, mrdisc_handle);
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ *
+ * vi: set shiftwidth=8 tabstop=8 noexpandtab:
+ * :indentSize=8:tabSize=8:noTabs=false:
+ */