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-rw-r--r--epan/dissectors/packet-cisco-marker.c209
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diff --git a/epan/dissectors/packet-cisco-marker.c b/epan/dissectors/packet-cisco-marker.c
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+/* packet-cisco-marker.c
+ * Routines for CISCO's ERSPAN3 Marker Packet
+ * See: http://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-733921.html#_Toc413144488
+ * See: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/93x/system-management/b-cisco-nexus-9000-series-nx-os-system-management-configuration-guide-93x/b-cisco-nexus-9000-series-nx-os-system-management-configuration-guide-93x_chapter_011110.html
+ * Copyright 2015, Peter Membrey
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * Copied from packet-time.c
+ * Fixed with additional documentation from Cisco and real-life observations
+ * by Stéphane Lapie <stephane.lapie@darkbsd.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include "config.h"
+
+#include <epan/packet.h>
+
+void proto_register_erspan_marker(void);
+void proto_reg_handoff_erspan_marker(void);
+
+
+static dissector_handle_t marker_handle;
+
+static int proto_marker = -1;
+
+static int hf_cisco_erspan_granularity = -1;
+static int hf_cisco_erspan_info = -1;
+static int hf_cisco_erspan_prop_header = -1;
+static int hf_cisco_erspan_reserved = -1;
+static int hf_cisco_erspan_sequence_number = -1;
+static int hf_cisco_erspan_ssid = -1;
+static int hf_cisco_erspan_tail = -1;
+static int hf_cisco_erspan_timestamp = -1;
+static int hf_cisco_erspan_type = -1;
+static int hf_cisco_erspan_utc_sec = -1;
+static int hf_cisco_erspan_utc_usec = -1;
+static int hf_cisco_erspan_utcoffset = -1;
+static int hf_cisco_erspan_version = -1;
+
+
+static gint ett_marker = -1;
+
+
+static int
+dissect_marker(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+ proto_tree *marker_tree;
+ proto_item *ti;
+
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "CISCO ERSPAN3 MARKER");
+
+
+ if (tree) {
+
+ /* Skip the proprietary CISCO header - no docs have been released for this */
+ guint32 offset = 20;
+
+ ti = proto_tree_add_item(tree, proto_marker, tvb, 0, -1, ENC_NA);
+ marker_tree = proto_item_add_subtree(ti, ett_marker);
+
+ proto_tree_add_item(marker_tree, hf_cisco_erspan_prop_header, tvb, 0, 20, ENC_NA);
+ proto_tree_add_item(marker_tree, hf_cisco_erspan_info, tvb, offset, 2, ENC_LITTLE_ENDIAN);
+ offset += 2;
+
+ proto_tree_add_item(marker_tree, hf_cisco_erspan_version, tvb, offset, 2, ENC_BIG_ENDIAN);
+ proto_tree_add_item(marker_tree, hf_cisco_erspan_type, tvb, offset, 2, ENC_BIG_ENDIAN);
+ proto_tree_add_item(marker_tree, hf_cisco_erspan_ssid, tvb, offset, 2, ENC_BIG_ENDIAN);
+ offset += 2;
+
+ proto_tree_add_item(marker_tree, hf_cisco_erspan_granularity, tvb, offset, 2, ENC_BIG_ENDIAN);
+ proto_tree_add_item(marker_tree, hf_cisco_erspan_utcoffset, tvb, offset, 2, ENC_BIG_ENDIAN);
+ offset+= 2;
+
+ proto_tree_add_item(marker_tree, hf_cisco_erspan_timestamp, tvb, offset, 8, ENC_BIG_ENDIAN);
+ offset+=8;
+
+ proto_tree_add_item(marker_tree, hf_cisco_erspan_utc_sec, tvb, offset, 4, ENC_BIG_ENDIAN);
+ offset+=4;
+
+ proto_tree_add_item(marker_tree, hf_cisco_erspan_utc_usec, tvb, offset, 4, ENC_BIG_ENDIAN);
+ offset+=4;
+
+ proto_tree_add_item(marker_tree, hf_cisco_erspan_sequence_number, tvb, offset, 4, ENC_LITTLE_ENDIAN);
+ offset+=4;
+
+ proto_tree_add_item(marker_tree, hf_cisco_erspan_reserved, tvb, offset, 4, ENC_LITTLE_ENDIAN);
+ offset+=4;
+
+ proto_tree_add_item(marker_tree, hf_cisco_erspan_tail, tvb, offset, 8, ENC_BIG_ENDIAN);
+ }
+ return tvb_captured_length(tvb);
+}
+
+
+void
+proto_register_erspan_marker(void)
+{
+ static hf_register_info hf[] = {
+ { &hf_cisco_erspan_prop_header,
+ { "Proprietary CISCO Header", "erspan-marker.prop_header",
+ FT_BYTES, BASE_NONE, NULL, 0x0,
+ NULL, HFILL }
+ },
+ { &hf_cisco_erspan_info,
+ { "Header", "erspan-marker.header",
+ FT_BOOLEAN, 8, NULL, 0x0,
+ NULL, HFILL }
+ },
+ { &hf_cisco_erspan_version,
+ { "Version", "erspan-marker.version",
+ FT_UINT16, BASE_DEC, NULL, 0x0f00,
+ NULL, HFILL }
+ },
+ { &hf_cisco_erspan_type,
+ { "Type", "erspan-marker.type",
+ FT_UINT16, BASE_DEC, NULL, 0xf000,
+ NULL, HFILL }
+ },
+ { &hf_cisco_erspan_ssid,
+ { "SSID", "erspan-marker.ssid",
+ FT_UINT16, BASE_DEC, NULL, 0x00ff,
+ NULL, HFILL }
+ },
+ { &hf_cisco_erspan_granularity,
+ { "Granularity", "erspan-marker.granularity",
+ FT_UINT16, BASE_DEC, NULL, 0xff00,
+ NULL, HFILL }
+ },
+ { &hf_cisco_erspan_utcoffset,
+ { "UTC Offset", "erspan-marker.utc_offset",
+ FT_UINT16, BASE_DEC, NULL, 0x00ff,
+ NULL, HFILL }
+ },
+ /* Timestamp is actually a 48-bit value, packed across 2 32-bit integers
+ * Timestamp_hi : 0000 ffff (high 16-bits)
+ * Timestamp_lo : ffff ffff (low 32-bits) */
+ { &hf_cisco_erspan_timestamp,
+ { "ASIC 48-bit Timestamp", "erspan-marker.timestamp",
+ FT_UINT48, BASE_DEC, NULL, 0xffffffffffff,
+ NULL, HFILL }
+ },
+ /* Comparison between the actual packet arrival time and this field
+ * indicated that the Ethernet packet's arrival time was behind
+ * the below field value by the value of the UTC offset
+ * (37 seconds as of Nov 2021) */
+ { &hf_cisco_erspan_utc_sec,
+ { "UTC Seconds", "erspan-marker.utc_sec",
+ FT_UINT32, BASE_DEC, NULL, 0x0,
+ NULL, HFILL }
+ },
+ { &hf_cisco_erspan_utc_usec,
+ { "UTC Microseconds", "erspan-marker.utc_usec",
+ FT_UINT32, BASE_DEC, NULL, 0x0,
+ NULL, HFILL }
+ },
+ { &hf_cisco_erspan_sequence_number,
+ { "Sequence Number", "erspan-marker.sequence_number",
+ FT_UINT32, BASE_DEC, NULL, 0x0,
+ NULL, HFILL }
+ },
+ { &hf_cisco_erspan_reserved,
+ { "Reserved", "erspan-marker.reserved",
+ FT_UINT32, BASE_HEX, NULL, 0x0,
+ NULL, HFILL }
+ },
+ /* The 32-bit signature is expected to be 0xA5A5A5A5,
+ * and while the Cisco documentation does not mention packing details,
+ * it does mention padding values to enforce alignment */
+ { &hf_cisco_erspan_tail,
+ { "TAIL", "erspan-marker.tail",
+ FT_UINT64, BASE_HEX, NULL, 0x00000000ffffffff,
+ NULL, HFILL }
+ },
+ };
+
+ static gint *ett[] = {
+ &ett_marker,
+ };
+
+
+ proto_marker = proto_register_protocol("CISCO ERSPAN3 Marker Packet", "CISCO3 ERSPAN MARKER", "erspan-marker");
+
+ proto_register_field_array(proto_marker, hf, array_length(hf));
+ proto_register_subtree_array(ett, array_length(ett));
+
+ marker_handle = register_dissector("erspan-marker", dissect_marker, proto_marker);
+}
+
+void
+proto_reg_handoff_erspan_marker(void)
+{
+ dissector_add_for_decode_as_with_preference("udp.port", marker_handle);
+}
+
+/*
+ * Editor modelines - https://www.wireshark.org/tools/modelines.html
+ *
+ * Local Variables:
+ * c-basic-offset: 2
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * ex: set shiftwidth=2 tabstop=8 expandtab:
+ * :indentSize=2:tabSize=8:noTabs=true:
+ */
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