/* packet-tte-pcf.c

 * Routines for Time Triggered Ethernet Protocol Control Frame dissection

 *

 * Author: Valentin Ecker

 * Author: Benjamin Roch, benjamin.roch (AT) tttech.com

 *

 * TTTech Computertechnik AG, Austria.

 * https://www.tttech.com/technologies/time-triggered-ethernet/

 *

 * Wireshark - Network traffic analyzer

 * By Gerald Combs <gerald@wireshark.org>

 * Copyright 1998 Gerald Combs

 *

 * SPDX-License-Identifier: GPL-2.0-or-later

 */

#include "config.h"

#include <epan/packet.h>

#include <epan/etypes.h>

#include "packet-tte.h"

void proto_register_tte_pcf(void);

void proto_reg_handoff_tte_pcf(void);

/* Initialize the protocol and registered fields */

static int proto_tte_pcf;

static int hf_tte_pcf_ic;

static int hf_tte_pcf_mn;

/* static int hf_tte_pcf_res0; */

static int hf_tte_pcf_sp;

static int hf_tte_pcf_sd;

static int hf_tte_pcf_type;

/* static int hf_tte_pcf_res1; */

static int hf_tte_pcf_tc;

/* Initialize the subtree pointers */

static int ett_tte_pcf;

static dissector_handle_t tte_pcf_handle;

static const value_string pcf_type_str_vals[] =

    { {2, "integration frame"}

    , {4, "coldstart frame"}

    , {8, "coldstart ack frame"}

    , {0, NULL}

    };

/* Code to actually dissect the packets */

static int

dissect_tte_pcf(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)

{

    /* Set up structures needed to add the protocol subtree and manage it */

    proto_item *tte_pcf_root_item;

    proto_tree *tte_pcf_tree;

    /* variables used to store the fields displayed in the info_column */

    uint8_t sync_priority = 0;

    uint8_t sync_domain   = 0;

    /* Check that there's enough data */

    if (tvb_reported_length(tvb) < TTE_PCF_LENGTH )

    {

        return 0;

    }

    /* get sync_priority and sync_domain */

    sync_priority = tvb_get_uint8(tvb, TTE_PCF_IC_LENGTH+TTE_PCF_MN_LENGTH+

        TTE_PCF_RES0_LENGTH);

    sync_domain = tvb_get_uint8(tvb, TTE_PCF_IC_LENGTH+TTE_PCF_MN_LENGTH+

        TTE_PCF_RES0_LENGTH+TTE_PCF_SP_LENGTH);

    /* Make entries in Protocol column and Info column on summary display */

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "PCF");

    col_add_fstr(pinfo->cinfo, COL_INFO,

            "Sync Domain: 0x%02X  Sync Priority: 0x%02X",

            sync_domain, sync_priority);

    if (tree) {

        /* create display subtree for the protocol */

        tte_pcf_root_item = proto_tree_add_item(tree, proto_tte_pcf, tvb, 0,

            TTE_PCF_LENGTH, ENC_NA);

        tte_pcf_tree = proto_item_add_subtree(tte_pcf_root_item, ett_tte_pcf);

        proto_tree_add_item(tte_pcf_tree,

            hf_tte_pcf_ic, tvb, 0, TTE_PCF_IC_LENGTH, ENC_BIG_ENDIAN);

        proto_tree_add_item(tte_pcf_tree,

            hf_tte_pcf_mn, tvb, TTE_PCF_IC_LENGTH, TTE_PCF_MN_LENGTH, ENC_BIG_ENDIAN);

     /* RESERVED FIELD --- will not be displayed */

     /* proto_tree_add_item(tte_pcf_tree,

            hf_tte_pcf_res0, tvb, TTE_PCF_IC_LENGTH+TTE_PCF_MN_LENGTH,

            TTE_PCF_RES0_LENGTH, ENC_BIG_ENDIAN); */

        proto_tree_add_item(tte_pcf_tree,

            hf_tte_pcf_sp, tvb, TTE_PCF_IC_LENGTH+TTE_PCF_MN_LENGTH+

            TTE_PCF_RES0_LENGTH, TTE_PCF_SP_LENGTH, ENC_BIG_ENDIAN);

        proto_tree_add_item(tte_pcf_tree,

            hf_tte_pcf_sd, tvb, TTE_PCF_IC_LENGTH+TTE_PCF_MN_LENGTH+

            TTE_PCF_RES0_LENGTH+TTE_PCF_SP_LENGTH, TTE_PCF_SD_LENGTH, ENC_BIG_ENDIAN);

        proto_tree_add_item(tte_pcf_tree,

            hf_tte_pcf_type, tvb, TTE_PCF_IC_LENGTH+TTE_PCF_MN_LENGTH+

            TTE_PCF_RES0_LENGTH+TTE_PCF_SP_LENGTH+TTE_PCF_SD_LENGTH,

            TTE_PCF_TYPE_LENGTH, ENC_BIG_ENDIAN);

     /* RESERVED FIELD --- will not be displayed */

     /* proto_tree_add_item(tte_pcf_tree,

            hf_tte_pcf_res1, tvb, TTE_PCF_IC_LENGTH+TTE_PCF_MN_LENGTH+

            TTE_PCF_RES0_LENGTH+TTE_PCF_SP_LENGTH+TTE_PCF_SD_LENGTH+

            TTE_PCF_TYPE_LENGTH, TTE_PCF_RES1_LENGTH, ENC_NA); */

        proto_tree_add_item(tte_pcf_tree,

            hf_tte_pcf_tc, tvb, TTE_PCF_IC_LENGTH+TTE_PCF_MN_LENGTH+

            TTE_PCF_RES0_LENGTH+TTE_PCF_SP_LENGTH+TTE_PCF_SD_LENGTH+

            TTE_PCF_TYPE_LENGTH+TTE_PCF_RES1_LENGTH, TTE_PCF_TC_LENGTH, ENC_BIG_ENDIAN);

    }

    return tvb_captured_length(tvb);

}

void

proto_register_tte_pcf(void)

{

    static hf_register_info hf[] = {

        { &hf_tte_pcf_ic,

            { "Integration Cycle", "tte_pcf.ic",

            FT_UINT32, BASE_HEX, NULL, 0x0,

            NULL, HFILL }

        },

            { &hf_tte_pcf_mn,

            { "Membership New", "tte_pcf.mn",

            FT_UINT32, BASE_HEX, NULL, 0x0,

            NULL, HFILL }

        },

#if 0

            { &hf_tte_pcf_res0,

            { "Reserved 0", "tte_pcf.res0",

            FT_UINT32, BASE_HEX, NULL, 0x0,

            NULL, HFILL }

        },

#endif

        { &hf_tte_pcf_sp,

            { "Sync Priority", "tte_pcf.sp",

            FT_UINT8, BASE_HEX, NULL, 0x0,

            NULL, HFILL }

        },

        { &hf_tte_pcf_sd,

            { "Sync Domain", "tte_pcf.sd",

            FT_UINT8, BASE_HEX, NULL, 0x0,

            NULL, HFILL }

        },

        { &hf_tte_pcf_type,

            { "Type", "tte_pcf.type",

            FT_UINT8, BASE_HEX, VALS(pcf_type_str_vals), 0x0F,

            NULL, HFILL }

        },

#if 0

        { &hf_tte_pcf_res1,

            { "Reserved 1", "tte_pcf.res1",

            FT_BYTES, BASE_NONE, NULL, 0x0,

            NULL, HFILL }

        },

#endif

        { &hf_tte_pcf_tc,

            { "Transparent Clock", "tte_pcf.tc",

            FT_UINT64, BASE_HEX, NULL, 0x0,

            NULL, HFILL }

        }

    };

    /* Setup protocol subtree array */

    static int *ett[] = {

        &ett_tte_pcf

    };

    /* Register the protocol name and description */

    proto_tte_pcf = proto_register_protocol("TTEthernet Protocol Control Frame",

        "TTE PCF", "tte_pcf");

    /* Required function calls to register header fields and subtrees used */

    proto_register_field_array(proto_tte_pcf, hf, array_length(hf));

    proto_register_subtree_array(ett, array_length(ett));

    tte_pcf_handle = register_dissector("tte_pcf", dissect_tte_pcf, proto_tte_pcf);

}

void

proto_reg_handoff_tte_pcf(void)

{

    dissector_add_uint("ethertype", ETHERTYPE_TTE_PCF, tte_pcf_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:

 */