/* packet-cosine.c

 * Routines for decoding CoSine IPNOS L2 debug output

 *

 * Motonori Shindo <motonori@shin.do>

 *

 * Wireshark - Network traffic analyzer

 * By Gerald Combs <gerald@wireshark.org>

 *

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

 */

/*

 * XXX TODO:

 *    o PPoATM and PPoFR encapsulation needs more test.

 *

 */

#include "config.h"

#include <epan/packet.h>

#include <wiretap/wtap.h>

void proto_register_cosine(void);

void proto_reg_handoff_cosine(void);

static int proto_cosine;

static int hf_pro;

static int hf_off;

static int hf_pri;

static int hf_rm;

static int hf_err;

static int hf_sar;

static int hf_channel_id;

static int ett_raw;

static dissector_handle_t cosine_handle;

static dissector_handle_t eth_withoutfcs_handle;

static dissector_handle_t ppp_hdlc_handle;

static dissector_handle_t llc_handle;

static dissector_handle_t chdlc_handle;

static dissector_handle_t fr_handle;

static int

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

{

  proto_tree               *fh_tree;

  proto_item               *ti;

  union wtap_pseudo_header *pseudo_header = pinfo->pseudo_header;

  /* load the top pane info. This should be overwritten by

     the next protocol in the stack */

  col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "N/A");

  col_set_str(pinfo->cinfo, COL_RES_DL_DST, "N/A");

  col_set_str(pinfo->cinfo, COL_PROTOCOL, "N/A");

  col_set_str(pinfo->cinfo, COL_INFO, "CoSine IPNOS L2 debug output");

  /* populate a tree in the second pane with the status of the link

     layer (ie none) */

  if(tree) {

    ti = proto_tree_add_protocol_format(tree, proto_cosine, tvb, 0, 0,

                                        "CoSine IPNOS L2 debug output (%s)",

                                        pseudo_header->cosine.if_name);

    fh_tree = proto_item_add_subtree(ti, ett_raw);

    proto_tree_add_uint(fh_tree, hf_pro, tvb, 0, 0, pseudo_header->cosine.pro);

    proto_tree_add_uint(fh_tree, hf_off, tvb, 0, 0, pseudo_header->cosine.off);

    proto_tree_add_uint(fh_tree, hf_pri, tvb, 0, 0, pseudo_header->cosine.pri);

    proto_tree_add_uint(fh_tree, hf_rm,  tvb, 0, 0, pseudo_header->cosine.rm);

    proto_tree_add_uint(fh_tree, hf_err, tvb, 0, 0, pseudo_header->cosine.err);

    switch (pseudo_header->cosine.encap) {

      case COSINE_ENCAP_ETH:

        break;

      case COSINE_ENCAP_ATM:

      case COSINE_ENCAP_PPoATM:

        proto_tree_add_item(fh_tree, hf_sar, tvb, 0, 16, ENC_NA);

        break;

      case COSINE_ENCAP_PPP:

      case COSINE_ENCAP_FR:

      case COSINE_ENCAP_PPoFR:

        proto_tree_add_item(fh_tree, hf_channel_id, tvb, 0, 4, ENC_NA);

        break;

      case COSINE_ENCAP_HDLC:

        if (pseudo_header->cosine.direction == COSINE_DIR_TX) {

          proto_tree_add_item(fh_tree, hf_channel_id, tvb, 0, 2, ENC_NA);

        } else if (pseudo_header->cosine.direction == COSINE_DIR_RX) {

          proto_tree_add_item(fh_tree, hf_channel_id, tvb, 0, 4, ENC_NA);

        }

        break;

      default:

        break;

    }

  }

  switch (pseudo_header->cosine.encap) {

    case COSINE_ENCAP_ETH:

      call_dissector(eth_withoutfcs_handle, tvb_new_subset_remaining(tvb, 0),

                     pinfo, tree);

      break;

    case COSINE_ENCAP_ATM:

    case COSINE_ENCAP_PPoATM:

      call_dissector(llc_handle, tvb_new_subset_remaining(tvb, 16),

                     pinfo, tree);

      break;

    case COSINE_ENCAP_PPP:

      call_dissector(ppp_hdlc_handle, tvb_new_subset_remaining(tvb, 4),

                     pinfo, tree);

      break;

    case COSINE_ENCAP_HDLC:

      if (pseudo_header->cosine.direction == COSINE_DIR_TX) {

        call_dissector(chdlc_handle, tvb_new_subset_remaining(tvb, 2),

                       pinfo, tree);

      } else if (pseudo_header->cosine.direction == COSINE_DIR_RX) {

        call_dissector(chdlc_handle, tvb_new_subset_remaining(tvb, 4),

                       pinfo, tree);

      }

      break;

    case COSINE_ENCAP_FR:

    case COSINE_ENCAP_PPoFR:

      call_dissector(fr_handle, tvb_new_subset_remaining(tvb, 4),

                     pinfo, tree);

      break;

    case COSINE_ENCAP_TEST:

    case COSINE_ENCAP_UNKNOWN:

      call_data_dissector(tvb, pinfo, tree);

      break;

    default:

      break;

  }

  return tvb_captured_length(tvb);

}

void

proto_register_cosine(void)

{

  static hf_register_info hf[] = {

    { &hf_pro,

      { "Protocol", "cosine.pro", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}},

    { &hf_off,

      { "Offset", "cosine.off", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}},

    { &hf_pri,

      { "Priority", "cosine.pri", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}},

    { &hf_rm,

      { "Rate Marking", "cosine.rm",  FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}},

    { &hf_err,

      { "Error Code", "cosine.err", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}},

    { &hf_sar,

      { "SAR header", "cosine.sar", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}},

    { &hf_channel_id,

      { "Channel handle ID", "cosine.channel_id", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}},

  };

  static int *ett[] = {

    &ett_raw,

  };

  proto_cosine = proto_register_protocol("CoSine IPNOS L2 debug output",

                                         "CoSine", "cosine");

  proto_register_field_array(proto_cosine, hf, array_length(hf));

  proto_register_subtree_array(ett, array_length(ett));

  cosine_handle = register_dissector("cosine", dissect_cosine, proto_cosine);

}

void

proto_reg_handoff_cosine(void)

{

  /*

   * Get handles for dissectors.

   */

  eth_withoutfcs_handle = find_dissector_add_dependency("eth_withoutfcs", proto_cosine);

  ppp_hdlc_handle       = find_dissector_add_dependency("ppp_hdlc", proto_cosine);

  llc_handle            = find_dissector_add_dependency("llc", proto_cosine);

  chdlc_handle          = find_dissector_add_dependency("chdlc", proto_cosine);

  fr_handle             = find_dissector_add_dependency("fr", proto_cosine);

  dissector_add_uint("wtap_encap", WTAP_ENCAP_COSINE, cosine_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:

 */