From Dario Lombardo, Alexander Chemeris and Ivan Klyuchnikovhis via

https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=8506
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=8507

Dissectors for the VRT (VITA 49 Radio Transport) and UHD protocols.

From me: modelines and misc trivial cleanups.


svn path=/trunk/; revision=48550

1 files changed, 682 insertions, 0 deletions

diff --git a/epan/dissectors/packet-vrt.c b/epan/dissectors/packet-vrt.c
new file mode 100644
index 0000000000..f29b4080ef
--- /dev/null
+++ b/epan/dissectors/packet-vrt.c
@@ -0,0 +1,682 @@
+/* packet-vrt.c
+ * Routines for VRT (VITA 49) packet disassembly
+ * Copyright 2013, Alexander Chemeris (alexander.chemeris@gmail.com), Dario Lombardo (lomato@gmail.com)
+ *
+ * $Id$
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+
+/*
+ * Original dissector can be found here
+ * https://github.com/chemeris/vrt-dissector
+*/
+
+
+#include "config.h"
+#include <epan/packet.h>
+#include <epan/prefs.h>
+
+static gint dissector_port_pref = 4991;
+
+static int proto_vrt = -1;
+
+/* fields */
+static int hf_vrt_header = -1; /* 32-bit header */
+static int hf_vrt_type = -1; /* 4-bit pkt type */
+static int hf_vrt_cidflag = -1; /* 1-bit class ID flag */
+static int hf_vrt_tflag = -1; /* 1-bit trailer flag */
+static int hf_vrt_tsmflag = -1; /* 1-bit timestamp mode */
+static int hf_vrt_tsi = -1; /* 2-bit timestamp type */
+static int hf_vrt_tsf = -1; /* 2-bit fractional timestamp type */
+static int hf_vrt_seq = -1; /* 4-bit sequence number */
+static int hf_vrt_len = -1; /* 16-bit length */
+static int hf_vrt_sid = -1; /* 32-bit stream ID (opt.) */
+static int hf_vrt_cid = -1; /* 64-bit class ID (opt.) */
+static int hf_vrt_cid_oui = -1; /* 24-bit class ID OUI */
+static int hf_vrt_cid_icc = -1; /* 16-bit class ID ICC */
+static int hf_vrt_cid_pcc = -1; /* 16-bit class ID PCC */
+static int hf_vrt_ts_int = -1; /* 32-bit integer timestamp (opt.) */
+static int hf_vrt_ts_frac_picosecond = -1; /* 64-bit fractional timestamp (opt.) */
+static int hf_vrt_ts_frac_sample = -1; /* 64-bit fractional timestamp (opt.) */
+static int hf_vrt_data = -1; /* data */
+static int hf_vrt_trailer = -1; /* 32-bit trailer (opt.) */
+static int hf_vrt_trailer_enables = -1; /* trailer indicator enables */
+static int hf_vrt_trailer_ind = -1; /* trailer indicators */
+static int hf_vrt_trailer_e = -1; /* ass con pac cnt enable */
+static int hf_vrt_trailer_acpc = -1; /* associated context packet count */
+static int hf_vrt_trailer_en_caltime = -1; /* calibrated time indicator */
+static int hf_vrt_trailer_en_valid = -1; /* valid data ind */
+static int hf_vrt_trailer_en_reflock = -1; /* reference locked ind */
+static int hf_vrt_trailer_en_agc = -1; /* AGC/MGC enabled ind */
+static int hf_vrt_trailer_en_sig = -1; /* signal detected ind */
+static int hf_vrt_trailer_en_inv = -1; /* spectral inversion ind */
+static int hf_vrt_trailer_en_overrng = -1; /* overrange indicator */
+static int hf_vrt_trailer_en_sampleloss = -1; /* sample loss indicator */
+static int hf_vrt_trailer_en_user0 = -1; /* User indicator 0 */
+static int hf_vrt_trailer_en_user1 = -1; /* User indicator 1 */
+static int hf_vrt_trailer_en_user2 = -1; /* User indicator 2 */
+static int hf_vrt_trailer_en_user3 = -1; /* User indicator 3 */
+static int hf_vrt_trailer_ind_caltime = -1; /* calibrated time indicator */
+static int hf_vrt_trailer_ind_valid = -1; /* valid data ind */
+static int hf_vrt_trailer_ind_reflock = -1; /* reference locked ind */
+static int hf_vrt_trailer_ind_agc = -1; /* AGC/MGC enabled ind */
+static int hf_vrt_trailer_ind_sig = -1; /* signal detected ind */
+static int hf_vrt_trailer_ind_inv = -1; /* spectral inversion ind */
+static int hf_vrt_trailer_ind_overrng = -1; /* overrange indicator */
+static int hf_vrt_trailer_ind_sampleloss = -1; /* sample loss indicator */
+static int hf_vrt_trailer_ind_user0 = -1; /* User indicator 0 */
+static int hf_vrt_trailer_ind_user1 = -1; /* User indicator 1 */
+static int hf_vrt_trailer_ind_user2 = -1; /* User indicator 2 */
+static int hf_vrt_trailer_ind_user3 = -1; /* User indicator 3 */
+
+/* subtree state variables */
+static gint ett_vrt = -1;
+static gint ett_header = -1;
+static gint ett_trailer = -1;
+static gint ett_indicators = -1;
+static gint ett_ind_enables = -1;
+static gint ett_cid = -1;
+
+static const value_string packet_types[] = {
+    {0x00, "IF data packet without stream ID"},
+    {0x01, "IF data packet with stream ID"},
+    {0x02, "Extension data packet without stream ID"},
+    {0x03, "Extension data packet with stream ID"},
+    {0x04, "IF context packet"},
+    {0x05, "Extension context packet"},
+    {0, NULL}
+};
+
+static const value_string tsi_types[] = {
+    {0x00, "No integer-seconds timestamp field included"},
+    {0x01, "Coordinated Universal Time (UTC)"},
+    {0x02, "GPS time"},
+    {0x03, "Other"},
+    {0, NULL}
+};
+
+static const value_string tsf_types[] = {
+    {0x00, "No fractional-seconds timestamp field included"},
+    {0x01, "Sample count timestamp"},
+    {0x02, "Real time (picoseconds) timestamp"},
+    {0x03, "Free running count timestamp"},
+    {0, NULL}
+};
+
+static const value_string tsm_types[] = {
+    {0x00, "Precise timestamp resolution"},
+    {0x01, "General timestamp resolution"},
+    {0, NULL}
+};
+
+static const int *enable_hfs[] = {
+    &hf_vrt_trailer_en_user3,
+    &hf_vrt_trailer_en_user2,
+    &hf_vrt_trailer_en_user1,
+    &hf_vrt_trailer_en_user0,
+    &hf_vrt_trailer_en_sampleloss,
+    &hf_vrt_trailer_en_overrng,
+    &hf_vrt_trailer_en_inv,
+    &hf_vrt_trailer_en_sig,
+    &hf_vrt_trailer_en_agc,
+    &hf_vrt_trailer_en_reflock,
+    &hf_vrt_trailer_en_valid,
+    &hf_vrt_trailer_en_caltime
+};
+
+static const int *ind_hfs[] = {
+    &hf_vrt_trailer_ind_user3,
+    &hf_vrt_trailer_ind_user2,
+    &hf_vrt_trailer_ind_user1,
+    &hf_vrt_trailer_ind_user0,
+    &hf_vrt_trailer_ind_sampleloss,
+    &hf_vrt_trailer_ind_overrng,
+    &hf_vrt_trailer_ind_inv,
+    &hf_vrt_trailer_ind_sig,
+    &hf_vrt_trailer_ind_agc,
+    &hf_vrt_trailer_ind_reflock,
+    &hf_vrt_trailer_ind_valid,
+    &hf_vrt_trailer_ind_caltime
+};
+
+void dissect_header(tvbuff_t *tvb, proto_tree *tree, int type, int offset);
+void dissect_trailer(tvbuff_t *tvb, proto_tree *tree, int offset);
+void dissect_cid(tvbuff_t *tvb, proto_tree *tree, int offset);
+void proto_reg_handoff_vrt(void);
+
+static void dissect_vrt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+    int offset = 0;
+    guint8 type;
+    guint8 sidflag;
+    guint8 cidflag;
+    guint8 tflag;
+    guint8 tsiflag;
+    guint8 tsfflag;
+    guint16 len;
+    gint16 nsamps;
+
+    proto_tree *vrt_tree;
+    proto_item *ti;
+
+    col_set_str(pinfo->cinfo, COL_PROTOCOL, "VITA 49");
+    col_clear(pinfo->cinfo,COL_INFO);
+
+    /* HACK to support UHD's weird header offset on data packets. */
+    if (tvb_get_guint8(tvb, 0) == 0) offset += 4;
+
+    /* get packet type */
+    type = tvb_get_guint8(tvb, offset) >> 4;
+    col_set_str(pinfo->cinfo, COL_INFO, val_to_str(type, packet_types, "Reserved packet type (0x%02x)"));
+
+    /* get SID, CID, T, TSI, and TSF flags */
+    sidflag = (type & 1) || (type == 4);
+    cidflag = (tvb_get_guint8(tvb, offset) >> 3) & 0x01;
+    /* tflag is in data packets but not context packets */
+    tflag =   (tvb_get_guint8(tvb, offset) >> 2) & 0x01;
+    if(type == 4) tflag = 0; /* this should be unnecessary but we do it
+                                just in case */
+    /* tsmflag is in context packets but not data packets
+       tsmflag = (tvb_get_guint8(tvb, offset) >> 0) & 0x01; */
+    tsiflag = (tvb_get_guint8(tvb, offset+1) >> 6) & 0x03;
+    tsfflag = (tvb_get_guint8(tvb, offset+1) >> 4) & 0x03;
+    len = tvb_get_ntohs(tvb, offset+2);
+    nsamps = len - 1 - sidflag - cidflag*2 - tsiflag - tsfflag*2 - tflag;
+
+    if (tree) { /* we're being asked for details */
+        ti = proto_tree_add_item(tree, proto_vrt, tvb, offset, -1, ENC_NA);
+        vrt_tree = proto_item_add_subtree(ti, ett_vrt);
+
+        dissect_header(tvb, vrt_tree, type, offset);
+        offset += 4;
+
+        /* header's done! if SID (last bit of type), put the stream ID here */
+        if(sidflag) {
+            proto_tree_add_item(vrt_tree, hf_vrt_sid, tvb, offset, 4, ENC_BIG_ENDIAN);
+            offset += 4;
+        }
+
+        /* if there's a class ID (cidflag), put the class ID here */
+        if(cidflag) {
+            dissect_cid(tvb, vrt_tree, offset);
+            offset += 8;
+        }
+
+        /* if TSI and/or TSF, populate those here */
+        if(tsiflag != 0) {
+            proto_tree_add_item(vrt_tree, hf_vrt_ts_int, tvb, offset, 4, ENC_BIG_ENDIAN);
+            offset += 4;
+        }
+        if(tsfflag != 0) {
+            if(tsfflag == 1 || tsfflag == 3) {
+                proto_tree_add_item(vrt_tree, hf_vrt_ts_frac_sample, tvb, offset, 8, ENC_BIG_ENDIAN);
+            } else if(tsfflag == 2) {
+                proto_tree_add_item(vrt_tree, hf_vrt_ts_frac_picosecond, tvb, offset, 8, ENC_BIG_ENDIAN);
+            }
+            offset += 8;
+        }
+
+        /* now we've got either a context packet or a data packet
+           TODO: parse context packet fully instead of just spewing data */
+
+        /* we're into the data */
+        if(nsamps > 0)
+        {
+            proto_tree_add_item(vrt_tree, hf_vrt_data, tvb, offset, nsamps*4, ENC_NA);
+        }
+
+        offset += nsamps*4;
+
+        if(tflag) {
+            dissect_trailer(tvb, vrt_tree, offset);
+        }
+
+
+    } else { /* we're being asked for a summary */
+
+    }
+}
+
+void dissect_header(tvbuff_t *tvb, proto_tree *tree, int type, int _offset)
+{
+    int offset;
+    proto_item *hdr_item;
+    proto_tree *hdr_tree;
+
+    offset = _offset;
+
+    hdr_item = proto_tree_add_item(tree, hf_vrt_header, tvb, offset, 4, ENC_BIG_ENDIAN);
+
+    hdr_tree = proto_item_add_subtree(hdr_item, ett_header);
+    proto_tree_add_item(hdr_tree, hf_vrt_type, tvb, offset, 1, ENC_NA);
+    proto_tree_add_item(hdr_tree, hf_vrt_cidflag, tvb, offset, 1, ENC_NA);
+    if(type == 4) {
+        proto_tree_add_item(hdr_tree, hf_vrt_tsmflag, tvb, offset, 1, ENC_NA);
+    } else {
+        proto_tree_add_item(hdr_tree, hf_vrt_tflag, tvb, offset, 1, ENC_NA);
+    }
+    offset += 1;
+    proto_tree_add_item(hdr_tree, hf_vrt_tsi, tvb, offset, 1, ENC_NA);
+    proto_tree_add_item(hdr_tree, hf_vrt_tsf, tvb, offset, 1, ENC_NA);
+    proto_tree_add_item(hdr_tree, hf_vrt_seq, tvb, offset, 1, ENC_NA);
+    offset += 1;
+    proto_tree_add_item(hdr_tree, hf_vrt_len, tvb, offset, 2, ENC_BIG_ENDIAN);
+}
+
+void dissect_trailer(tvbuff_t *tvb, proto_tree *tree, int offset)
+{
+    proto_item *enable_item, *ind_item, *trailer_item;
+    proto_tree *enable_tree;
+    proto_tree *ind_tree;
+    proto_tree *trailer_tree;
+    guint16 en_bits;
+    gint16 i;
+
+    trailer_item = proto_tree_add_item(tree, hf_vrt_trailer, tvb, offset, 4, ENC_BIG_ENDIAN);
+    trailer_tree = proto_item_add_subtree(trailer_item, ett_trailer);
+
+    /* grab the indicator enables and the indicators
+       only display enables, indicators which are enabled */
+    enable_item = proto_tree_add_item(trailer_tree, hf_vrt_trailer_enables, tvb, offset, 2, ENC_NA);
+    ind_item = proto_tree_add_item(trailer_tree, hf_vrt_trailer_ind, tvb, offset + 1, 2, ENC_NA);
+    /* grab enable bits */
+    en_bits = (tvb_get_ntohs(tvb, offset) & 0xFFF0) >> 4;
+
+    /* if there's any enables, start trees for enable bits and for indicators
+       only enables and indicators which are enabled get printed. */
+    if(en_bits) {
+        enable_tree = proto_item_add_subtree(enable_item, ett_ind_enables);
+        ind_tree = proto_item_add_subtree(ind_item, ett_indicators);
+        for(i = 11; i >= 0; i--) {
+            if(en_bits & (1<<i)) {
+                proto_tree_add_bits_item(enable_tree, *enable_hfs[i], tvb, (offset+(i<3)) * 8 + (i+1), 1, ENC_NA);
+                proto_tree_add_bits_item(ind_tree, *ind_hfs[i], tvb, (offset+(i<8)+1) * 8 + (i+5), 1, ENC_NA);
+            }
+        }
+    }
+    offset += 3;
+    proto_tree_add_item(trailer_tree, hf_vrt_trailer_e, tvb, offset, 1, ENC_NA);
+    proto_tree_add_item(trailer_tree, hf_vrt_trailer_acpc, tvb, offset, 1, ENC_NA);
+}
+
+void dissect_cid(tvbuff_t *tvb, proto_tree *tree, int offset)
+{
+    proto_item *cid_item;
+    proto_tree *cid_tree;
+
+    cid_item = proto_tree_add_item(tree, hf_vrt_cid, tvb, offset, 8, ENC_BIG_ENDIAN);
+    cid_tree = proto_item_add_subtree(cid_item, ett_cid);
+
+    offset += 1;
+    proto_tree_add_item(cid_tree, hf_vrt_cid_oui, tvb, offset, 3, ENC_BIG_ENDIAN);
+    offset += 3;
+    proto_tree_add_item(cid_tree, hf_vrt_cid_icc, tvb, offset, 2, ENC_BIG_ENDIAN);
+    offset += 2;
+    proto_tree_add_item(cid_tree, hf_vrt_cid_pcc, tvb, offset, 2, ENC_BIG_ENDIAN);
+}
+
+void
+proto_register_vrt(void)
+{
+    static hf_register_info hf[] = {
+        { &hf_vrt_header,
+            { "VRT header", "vrt.hdr",
+            FT_UINT32, BASE_HEX,
+            NULL, 0x00,
+            NULL, HFILL }
+        },
+        { &hf_vrt_type,
+            { "Packet type", "vrt.type",
+            FT_UINT8, 4,
+            VALS(packet_types), 0xF0,
+            NULL, HFILL }
+        },
+        { &hf_vrt_cidflag,
+            { "Class ID included", "vrt.cidflag",
+            FT_BOOLEAN, 1,
+            NULL, 0x08,
+            NULL, HFILL }
+        },
+        { &hf_vrt_tflag,
+            { "Trailer included", "vrt.tflag",
+            FT_BOOLEAN, 1,
+            NULL, 0x04,
+            NULL, HFILL }
+        },
+        { &hf_vrt_tsmflag,
+            { "Timestamp mode", "vrt.tsmflag",
+            FT_UINT8, 1,
+            VALS(tsm_types), 0x01,
+            NULL, HFILL }
+        },
+        { &hf_vrt_tsi,
+            { "Integer timestamp type", "vrt.tsi",
+            FT_UINT8, 2,
+            VALS(tsi_types), 0xC0,
+            NULL, HFILL }
+        },
+        { &hf_vrt_tsf,
+            { "Fractional timestamp type", "vrt.tsf",
+            FT_UINT8, 2,
+            VALS(tsf_types), 0x30,
+            NULL, HFILL }
+        },
+        { &hf_vrt_seq,
+            { "Sequence number", "vrt.seq",
+            FT_UINT8, 4,
+            NULL, 0x0F,
+            NULL, HFILL }
+        },
+        { &hf_vrt_len,
+            { "Length", "vrt.len",
+            FT_UINT16, BASE_DEC,
+            NULL, 0x00,
+            NULL, HFILL }
+        },
+        { &hf_vrt_ts_int,
+            { "Integer timestamp", "vrt.ts_int",
+            FT_UINT32, BASE_DEC,
+            NULL, 0x00,
+            NULL, HFILL }
+        },
+        { &hf_vrt_ts_frac_sample,
+            { "Fractional timestamp (samples)", "vrt.ts_frac",
+            FT_UINT64, BASE_DEC,
+            NULL, 0x00,
+            NULL, HFILL }
+        },
+        { &hf_vrt_ts_frac_picosecond,
+            { "Fractional timestamp (picoseconds)", "vrt.ts_frac",
+            FT_DOUBLE, BASE_NONE,
+            NULL, 0x00,
+            NULL, HFILL }
+        },
+        { &hf_vrt_sid,
+            { "Stream ID", "vrt.sid",
+            FT_UINT32, BASE_HEX,
+            NULL, 0x00,
+            NULL, HFILL }
+        },
+        { &hf_vrt_cid,
+            { "Class ID", "vrt.cid",
+            FT_UINT64, BASE_HEX,
+            NULL, 0x00,
+            NULL, HFILL }
+        },
+        { &hf_vrt_data,
+            { "Data", "vrt.data",
+            FT_BYTES, BASE_NONE,
+            NULL, 0x00,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer,
+            { "Trailer", "vrt.trailer",
+            FT_UINT32, BASE_HEX,
+            NULL, 0x00,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_enables,
+            { "Indicator enable bits", "vrt.enables",
+            FT_UINT16, BASE_HEX,
+            NULL, 0xFFF0,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_ind,
+            { "Indicator bits", "vrt.indicators",
+            FT_UINT16, BASE_HEX,
+            NULL, 0x0FFF,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_e,
+            { "Associated context packet count enabled", "vrt.e",
+            FT_BOOLEAN, 1,
+            NULL, 0x80,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_acpc,
+            { "Associated context packet count", "vrt.acpc",
+            FT_UINT8, BASE_DEC,
+            NULL, 0x7F,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_ind_caltime,
+            { "Calibrated time indicator", "vrt.caltime",
+            FT_BOOLEAN, 1,
+            NULL, 0x08,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_ind_valid,
+            { "Valid signal indicator", "vrt.valid",
+            FT_BOOLEAN, 1,
+            NULL, 0x04,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_ind_reflock,
+            { "Reference lock indicator", "vrt.reflock",
+            FT_BOOLEAN, 1,
+            NULL, 0x02,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_ind_agc,
+            { "AGC/MGC indicator", "vrt.agc",
+            FT_BOOLEAN, 1,
+            NULL, 0x01,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_ind_sig,
+            { "Signal detected indicator", "vrt.sig",
+            FT_BOOLEAN, 1,
+            NULL, 0x80,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_ind_inv,
+            { "Spectral inversion indicator", "vrt.inv",
+            FT_BOOLEAN, 1,
+            NULL, 0x40,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_ind_overrng,
+            { "Overrange indicator", "vrt.overrng",
+            FT_BOOLEAN, 1,
+            NULL, 0x20,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_ind_sampleloss,
+            { "Lost sample indicator", "vrt.sampleloss",
+            FT_BOOLEAN, 1,
+            NULL, 0x10,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_ind_user0,
+            { "User indicator 0", "vrt.user0",
+            FT_BOOLEAN, 1,
+            NULL, 0x000,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_ind_user1,
+            { "User indicator 1", "vrt.user1",
+            FT_BOOLEAN, 1,
+            NULL, 0x0000,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_ind_user2,
+            { "User indicator 2", "vrt.user2",
+            FT_BOOLEAN, 1,
+            NULL, 0x000,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_ind_user3,
+            { "User indicator 3", "vrt.user3",
+            FT_BOOLEAN, 1,
+            NULL, 0x0000,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_en_caltime,
+            { "Calibrated time indicator enable", "vrt.caltime_en",
+            FT_BOOLEAN, 1,
+            NULL, 0x80,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_en_valid,
+            { "Valid signal indicator enable", "vrt.valid_en",
+            FT_BOOLEAN, 1,
+            NULL, 0x40,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_en_reflock,
+            { "Reference lock indicator enable", "vrt.reflock_en",
+            FT_BOOLEAN, 1,
+            NULL, 0x20,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_en_agc,
+            { "AGC/MGC indicator enable", "vrt.agc_en",
+            FT_BOOLEAN, 1,
+            NULL, 0x10,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_en_sig,
+            { "Signal detected indicator enable", "vrt.sig_en",
+            FT_BOOLEAN, 1,
+            NULL, 0x08,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_en_inv,
+            { "Spectral inversion indicator enable", "vrt.inv_en",
+            FT_BOOLEAN, 1,
+            NULL, 0x04,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_en_overrng,
+            { "Overrange indicator enable", "vrt.overrng_en",
+            FT_BOOLEAN, 1,
+            NULL, 0x02,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_en_sampleloss,
+            { "Lost sample indicator enable", "vrt.sampleloss_en",
+            FT_BOOLEAN, 1,
+            NULL, 0x01,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_en_user0,
+            { "User indicator 0 enable", "vrt.user0_en",
+            FT_BOOLEAN, 1,
+            NULL, 0x80,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_en_user1,
+            { "User indicator 1 enable", "vrt.user1_en",
+            FT_BOOLEAN, 1,
+            NULL, 0x0000,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_en_user2,
+            { "User indicator 2 enable", "vrt.user2_en",
+            FT_BOOLEAN, 1,
+            NULL, 0x20,
+            NULL, HFILL }
+        },
+        { &hf_vrt_trailer_en_user3,
+            { "User indicator 3 enable", "vrt.user3_en",
+            FT_BOOLEAN, 1,
+            NULL, 0x0000,
+            NULL, HFILL }
+        },
+        { &hf_vrt_cid_oui,
+            { "Class ID Organizationally Unique ID", "vrt.oui",
+            FT_UINT24, BASE_HEX,
+            NULL, 0x00,
+            NULL, HFILL }
+        },
+        { &hf_vrt_cid_icc,
+            { "Class ID Information Class Code", "vrt.icc",
+            FT_UINT16, BASE_DEC,
+            NULL, 0x00,
+            NULL, HFILL }
+        },
+        { &hf_vrt_cid_pcc,
+            { "Class ID Packet Class Code", "vrt.pcc",
+            FT_UINT16, BASE_DEC,
+            NULL, 0x00,
+            NULL, HFILL }
+        }
+    };
+
+    static gint *ett[] = {
+        &ett_vrt,
+        &ett_header,
+        &ett_trailer,
+        &ett_indicators,
+        &ett_ind_enables,
+        &ett_cid
+     };
+
+    module_t *vrt_module;
+
+    proto_vrt = proto_register_protocol (
+        "VITA 49 radio transport protocol", /* name       */
+        "VITA 49",      /* short name */
+        "vrt"       /* abbrev     */
+        );
+
+    proto_register_field_array(proto_vrt, hf, array_length(hf));
+    proto_register_subtree_array(ett, array_length(ett));
+
+    vrt_module = prefs_register_protocol(proto_vrt, proto_reg_handoff_vrt);
+    prefs_register_uint_preference(vrt_module,
+        "dissector_port",
+        "Dissector UDP port",
+        "The UDP port used by this dissector",
+        10, &dissector_port_pref);
+}
+
+void
+proto_reg_handoff_vrt(void)
+{
+    static gboolean vrt_prefs_initialized = FALSE;
+    static dissector_handle_t vrt_handle;
+    static gint dissector_port;
+
+    if (!vrt_prefs_initialized) {
+        vrt_handle = create_dissector_handle(dissect_vrt, proto_vrt);
+        vrt_prefs_initialized = TRUE;
+    } else {
+        dissector_delete_uint("udp.port", dissector_port, vrt_handle);
+    }
+
+    dissector_port = dissector_port_pref;
+
+    dissector_add_uint("udp.port", dissector_port, vrt_handle);
+}
+
+/*
+ * Editor modelines  -  http://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:
+ */