epan/dissectors/packet-bctp.c

   1 /*
   2  *  packet-bctp.c
   3  *  Q.1990 BICC bearer control tunnelling protocol
   4  *
   5  *  (c) 2007, Luis E. Garcia Ontanon <luis@ontanon.org>
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * SPDX-License-Identifier: GPL-2.0-or-later
  12  *
  13  * Ref ITU-T Rec. Q.1990 (07/2001)
  14  */
  15
  16 #include "config.h"
  17
  18 #include <epan/packet.h>
  19
  20 #define PNAME  "BCTP Q.1990"
  21 #define PSNAME "BCTP"
  22 #define PFNAME "bctp"
  23
  24 void proto_register_bctp(void);
  25 void proto_reg_handoff_bctp(void);
  26
  27 static int proto_bctp;
  28 static int hf_bctp_bvei;
  29 static int hf_bctp_bvi;
  30 static int hf_bctp_tpei;
  31 static int hf_bctp_tpi;
  32
  33 static int ett_bctp;
  34 static dissector_table_t bctp_dissector_table;
  35 static dissector_handle_t text_handle;
  36
  37 /*
  38 static const range_string tpi_vals[] = {
  39         {0x00,0x17,"spare (binary encoded protocols)"},
  40         {0x18,0x1f,"reserved for national use (binary encoded protocols)"},
  41         {0x20,0x20,"IPBCP (text encoded)"},
  42         {0x21,0x21,"spare (text encoded protocol)"},
  43         {0x22,0x22,"not used"},
  44         {0x23,0x37,"spare (text encoded protocols)"},
  45         {0x38,0x3f,"reserved for national use (text encoded protocols)"},
  46         {0,0,NULL}
  47 };
  48 */
  49
  50 static const value_string bvei_vals[] = {
  51         {0,"No indication"},
  52         {1,"Version Error Indication, BCTP version not supported"},
  53         {0,NULL}
  54 };
  55
  56
  57 static int dissect_bctp(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree, void* data _U_) {
  58         proto_item* pi = proto_tree_add_item(tree, proto_bctp, tvb,0,2, ENC_NA);
  59         proto_tree* pt = proto_item_add_subtree(pi,ett_bctp);
  60         tvbuff_t* sub_tvb = tvb_new_subset_remaining(tvb, 2);
  61         uint8_t tpi = tvb_get_uint8(tvb,1) & 0x3f;
  62
  63         proto_tree_add_item(pt, hf_bctp_bvei, tvb,0,2, ENC_BIG_ENDIAN);
  64         proto_tree_add_item(pt, hf_bctp_bvi, tvb,0,2, ENC_BIG_ENDIAN);
  65         proto_tree_add_item(pt, hf_bctp_tpei, tvb,0,2, ENC_BIG_ENDIAN);
  66         proto_tree_add_item(pt, hf_bctp_tpi, tvb,0,2, ENC_BIG_ENDIAN);
  67
  68         if (!dissector_try_uint(bctp_dissector_table, tpi, sub_tvb, pinfo, tree) ) {
  69                 if (tpi <= 0x22) {
  70                         call_data_dissector(sub_tvb, pinfo, tree);
  71                 } else {
  72                         /* tpi > 0x22 */
  73                         call_dissector(text_handle,sub_tvb, pinfo, tree);
  74                 }
  75         }
  76         return tvb_captured_length(tvb);
  77 }
  78
  79 void
  80 proto_register_bctp (void)
  81 {
  82         static hf_register_info hf[] = {
  83                 {&hf_bctp_bvei, {"BVEI", "bctp.bvei", FT_UINT16, BASE_HEX, VALS(bvei_vals), 0x4000, "BCTP Version Error Indicator", HFILL }},
  84                 {&hf_bctp_bvi, {"BVI", "bctp.bvi", FT_UINT16, BASE_HEX, NULL, 0x1F00, "BCTP Version Indicator", HFILL }},
  85                 {&hf_bctp_tpei, {"TPEI", "bctp.tpei", FT_UINT16, BASE_HEX, NULL, 0x0040, "Tunneled Protocol Error Indicator", HFILL }},
  86                 {&hf_bctp_tpi, {"TPI", "bctp.tpi", FT_UINT16, BASE_HEX, NULL, 0x003F, "Tunneled Protocol Indicator", HFILL }},
  87         };
  88         static int *ett[] = {
  89                 &ett_bctp
  90         };
  91
  92         proto_bctp = proto_register_protocol(PNAME, PSNAME, PFNAME);
  93         proto_register_field_array(proto_bctp, hf, array_length(hf));
  94         proto_register_subtree_array(ett, array_length(ett));
  95
  96         register_dissector("bctp", dissect_bctp, proto_bctp);
  97
  98         bctp_dissector_table = register_dissector_table("bctp.tpi", "BCTP Tunneled Protocol Indicator", proto_bctp, FT_UINT32, BASE_DEC);
  99 }
 100
 101 void
 102 proto_reg_handoff_bctp(void)
 103 {
 104         text_handle = find_dissector_add_dependency("data-text-lines", proto_bctp);
 105 }
 106
 107 /*
 108  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 109  *
 110  * Local variables:
 111  * c-basic-offset: 8
 112  * tab-width: 8
 113  * indent-tabs-mode: t
 114  * End:
 115  *
 116  * vi: set shiftwidth=8 tabstop=8 noexpandtab:
 117  * :indentSize=8:tabSize=8:noTabs=false:
 118  */