epan/dissectors/packet-hci_h4.c

   1 /* packet-hci_h4.c
   2  * Routines for the Bluetooth HCI H4 dissection
   3  *
   4  * Copyright 2002, Christoph Scholz <scholz@cs.uni-bonn.de>
   5  *  From: http://affix.sourceforge.net/archive/ethereal_affix-3.patch
   6  *
   7  * Refactored for wireshark checkin
   8  *   Ronnie Sahlberg 2006
   9  *
  10  * Wireshark - Network traffic analyzer
  11  * By Gerald Combs <gerald@wireshark.org>
  12  * Copyright 1998 Gerald Combs
  13  *
  14  * SPDX-License-Identifier: GPL-2.0-or-later
  15  */
  16
  17 #include "config.h"
  18
  19 #include <epan/packet.h>
  20 #include <wiretap/wtap.h>
  21 #include "packet-bluetooth.h"
  22
  23 static int proto_hci_h4;
  24 static int hf_hci_h4_type;
  25 static int hf_hci_h4_direction;
  26
  27 static int ett_hci_h4;
  28
  29 static dissector_handle_t hci_h4_handle;
  30
  31 static dissector_table_t hci_h4_table;
  32
  33 static const value_string hci_h4_type_vals[] = {
  34     {HCI_H4_TYPE_CMD, "HCI Command"},
  35     {HCI_H4_TYPE_ACL, "ACL Data"},
  36     {HCI_H4_TYPE_SCO, "SCO Data"},
  37     {HCI_H4_TYPE_EVT, "HCI Event"},
  38     {HCI_H4_TYPE_ISO, "ISO Data"},
  39     {0, NULL }
  40 };
  41 static const value_string hci_h4_direction_vals[] = {
  42     {P2P_DIR_SENT,        "Sent"},
  43     {P2P_DIR_RECV,        "Rcvd"},
  44     {P2P_DIR_UNKNOWN,     "Unspecified"},
  45     {0, NULL}
  46 };
  47
  48 void proto_register_hci_h4(void);
  49 void proto_reg_handoff_hci_h4(void);
  50
  51 static int
  52 dissect_hci_h4(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
  53 {
  54     uint8_t            type;
  55     tvbuff_t          *next_tvb;
  56     proto_item        *main_item;
  57     proto_tree        *main_tree;
  58     proto_item        *sub_item;
  59     bluetooth_data_t  *bluetooth_data;
  60
  61     bluetooth_data = (bluetooth_data_t *) data;
  62
  63     col_set_str(pinfo->cinfo, COL_PROTOCOL, "HCI H4");
  64     switch (pinfo->p2p_dir) {
  65
  66     case P2P_DIR_SENT:
  67         col_set_str(pinfo->cinfo, COL_INFO, "Sent ");
  68         break;
  69
  70     case P2P_DIR_RECV:
  71         col_set_str(pinfo->cinfo, COL_INFO, "Rcvd ");
  72         break;
  73
  74     case P2P_DIR_UNKNOWN:
  75         break;
  76
  77     default:
  78         col_add_fstr(pinfo->cinfo, COL_INFO, "Unknown direction %d ",
  79                 pinfo->p2p_dir);
  80         break;
  81     }
  82
  83     type = tvb_get_uint8(tvb, 0);
  84
  85     main_item = proto_tree_add_item(tree, proto_hci_h4, tvb, 0, 1, ENC_NA);
  86     main_tree = proto_item_add_subtree(main_item, ett_hci_h4);
  87
  88     sub_item = proto_tree_add_uint(main_tree, hf_hci_h4_direction, tvb, 0, 0, pinfo->p2p_dir);
  89     proto_item_set_generated(sub_item);
  90
  91     proto_tree_add_item(main_tree, hf_hci_h4_type,
  92         tvb, 0, 1, ENC_LITTLE_ENDIAN);
  93     col_append_str(pinfo->cinfo, COL_INFO,
  94             val_to_str(type, hci_h4_type_vals, "Unknown HCI packet type 0x%02x"));
  95
  96     next_tvb = tvb_new_subset_remaining(tvb, 1);
  97     if (!dissector_try_uint_with_data(hci_h4_table, type, next_tvb, pinfo, tree, true, bluetooth_data)) {
  98         call_data_dissector(next_tvb, pinfo, tree);
  99     }
 100
 101     return 1;
 102 }
 103
 104
 105 void
 106 proto_register_hci_h4(void)
 107 {
 108     static hf_register_info hf[] = {
 109         { &hf_hci_h4_type,
 110             { "HCI Packet Type",           "hci_h4.type",
 111             FT_UINT8, BASE_HEX, VALS(hci_h4_type_vals), 0x0,
 112             NULL, HFILL }
 113         },
 114         { &hf_hci_h4_direction,
 115             { "Direction",                 "hci_h4.direction",
 116             FT_UINT8, BASE_HEX, VALS(hci_h4_direction_vals), 0x0,
 117             "HCI Packet Direction Sent/Rcvd", HFILL }
 118         }
 119     };
 120
 121     static int *ett[] = {
 122         &ett_hci_h4,
 123     };
 124
 125     proto_hci_h4 = proto_register_protocol("Bluetooth HCI H4", "HCI_H4", "hci_h4");
 126
 127     hci_h4_handle = register_dissector("hci_h4", dissect_hci_h4, proto_hci_h4);
 128
 129     proto_register_field_array(proto_hci_h4, hf, array_length(hf));
 130     proto_register_subtree_array(ett, array_length(ett));
 131
 132     hci_h4_table = register_dissector_table("hci_h4.type",
 133             "HCI H4 pdu type", proto_hci_h4, FT_UINT8, BASE_HEX);
 134 }
 135
 136 void
 137 proto_reg_handoff_hci_h4(void)
 138 {
 139     dissector_add_uint("bluetooth.encap", WTAP_ENCAP_BLUETOOTH_H4, hci_h4_handle);
 140     dissector_add_uint("bluetooth.encap", WTAP_ENCAP_BLUETOOTH_H4_WITH_PHDR, hci_h4_handle);
 141 }
 142
 143 /*
 144  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 145  *
 146  * Local variables:
 147  * c-basic-offset: 4
 148  * tab-width: 8
 149  * indent-tabs-mode: nil
 150  * End:
 151  *
 152  * vi: set shiftwidth=4 tabstop=8 expandtab:
 153  * :indentSize=4:tabSize=8:noTabs=true:
 154  */