epan/dissectors/packet-sscf-nni.c

   1 /* packet-sscf-nni.c
   2  * Routines for SSCF-NNI (Q.2140) frame disassembly
   3  * Jeff Morriss <jeff.morriss.ws [AT] gmail.com>
   4  *
   5  * Wireshark - Network traffic analyzer
   6  * By Gerald Combs <gerald@wireshark.org>
   7  * Copyright 1998
   8  *
   9  * Copied from packet-sscop.c
  10  *
  11  * SPDX-License-Identifier: GPL-2.0-or-later
  12  */
  13
  14 #include "config.h"
  15
  16 #include <epan/packet.h>
  17
  18 void proto_register_sscf(void);
  19 void proto_reg_handoff_sscf(void);
  20
  21 static int proto_sscf;
  22
  23 static int ett_sscf;
  24
  25 static dissector_handle_t mtp3_handle;
  26
  27 #define SSCF_PDU_LENGTH 4
  28 #define SSCF_STATUS_OFFSET 3
  29 #define SSCF_STATUS_LENGTH 1
  30 #define SSCF_SPARE_OFFSET 0
  31 #define SSCF_SPARE_LENGTH 3
  32
  33 static int hf_status;
  34 static int hf_spare;
  35
  36 #define SSCF_STATUS_OOS 0x01
  37 #define SSCF_STATUS_PO  0x02
  38 #define SSCF_STATUS_IS  0x03
  39 #define SSCF_STATUS_NORMAL 0x04
  40 #define SSCF_STATUS_EMERGENCY 0x05
  41 #define SSCF_STATUS_ALIGNMENT_NOT_SUCCESSFUL 0x7
  42 #define SSCF_STATUS_MANAGEMENT_INITIATED 0x08
  43 #define SSCF_STATUS_PROTOCOL_ERROR 0x09
  44 #define SSCF_STATUS_PROVING_NOT_SUCCESSFUL 0x0a
  45
  46 static const value_string sscf_status_vals[] = {
  47   { SSCF_STATUS_OOS,                      "Out of Service" },
  48   { SSCF_STATUS_PO,                       "Processor Outage" },
  49   { SSCF_STATUS_IS,                       "In Service" },
  50   { SSCF_STATUS_NORMAL,                   "Normal" },
  51   { SSCF_STATUS_EMERGENCY,                "Emergency" },
  52   { SSCF_STATUS_ALIGNMENT_NOT_SUCCESSFUL, "Alignment Not Successful" },
  53   { SSCF_STATUS_MANAGEMENT_INITIATED,     "Management Initiated" },
  54   { SSCF_STATUS_PROTOCOL_ERROR,           "Protocol Error" },
  55   { SSCF_STATUS_PROVING_NOT_SUCCESSFUL,   "Proving Not Successful" },
  56   { 0,                                    NULL }
  57 };
  58
  59 static int
  60 dissect_sscf_nni(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  61 {
  62   unsigned reported_length;
  63   proto_item *sscf_item = NULL;
  64   proto_tree *sscf_tree = NULL;
  65   uint8_t sscf_status;
  66
  67   reported_length = tvb_reported_length(tvb);  /* frame length */
  68
  69   if (tree) {
  70     sscf_item = proto_tree_add_item(tree, proto_sscf, tvb, 0, -1, ENC_NA);
  71     sscf_tree = proto_item_add_subtree(sscf_item, ett_sscf);
  72   }
  73
  74   if (reported_length > SSCF_PDU_LENGTH)
  75   {
  76     call_dissector(mtp3_handle, tvb, pinfo, tree);
  77
  78   } else {
  79
  80     sscf_status = tvb_get_uint8(tvb, SSCF_STATUS_OFFSET);
  81
  82     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SSCF-NNI");
  83     col_add_fstr(pinfo->cinfo, COL_INFO, "STATUS (%s) ",
  84                  val_to_str_const(sscf_status, sscf_status_vals, "Unknown"));
  85
  86
  87     proto_tree_add_item(sscf_tree, hf_status, tvb, SSCF_STATUS_OFFSET,
  88                         SSCF_STATUS_LENGTH, ENC_BIG_ENDIAN);
  89     proto_tree_add_item(sscf_tree, hf_spare, tvb, SSCF_SPARE_OFFSET,
  90                         SSCF_SPARE_LENGTH, ENC_BIG_ENDIAN);
  91   }
  92
  93   return tvb_captured_length(tvb);
  94 }
  95
  96 void
  97 proto_register_sscf(void)
  98 {
  99   static hf_register_info hf[] =
 100   { { &hf_status, { "Status", "sscf-nni.status", FT_UINT8, BASE_HEX,
 101                     VALS(sscf_status_vals), 0x0, NULL, HFILL} },
 102     { &hf_spare, { "Spare", "sscf-nni.spare", FT_UINT24, BASE_HEX,
 103                    NULL, 0x0, NULL, HFILL} }
 104   };
 105
 106   static int *ett[] = {
 107     &ett_sscf,
 108   };
 109
 110   proto_sscf = proto_register_protocol("SSCF-NNI", "SSCF-NNI", "sscf-nni");
 111
 112   proto_register_field_array(proto_sscf, hf, array_length(hf));
 113   proto_register_subtree_array(ett, array_length(ett));
 114
 115   register_dissector("sscf-nni", dissect_sscf_nni, proto_sscf);
 116
 117 }
 118
 119 void
 120 proto_reg_handoff_sscf(void)
 121 {
 122   mtp3_handle = find_dissector_add_dependency("mtp3", proto_sscf);
 123 }
 124
 125 /*
 126  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 127  *
 128  * Local Variables:
 129  * c-basic-offset: 2
 130  * tab-width: 8
 131  * indent-tabs-mode: nil
 132  * End:
 133  *
 134  * ex: set shiftwidth=2 tabstop=8 expandtab:
 135  * :indentSize=2:tabSize=8:noTabs=true:
 136  */