epan/dissectors/packet-hci_h1.c

   1 /* packet-hci_h1.c
   2  * Routines for the Bluetooth HCI H1 dissection
   3  *
   4  * Wireshark - Network traffic analyzer
   5  * By Gerald Combs <gerald@wireshark.org>
   6  * Copyright 1998 Gerald Combs
   7  *
   8  * SPDX-License-Identifier: GPL-2.0-or-later
   9  */
  10
  11 #include "config.h"
  12
  13 #include <epan/packet.h>
  14 #include <wiretap/wtap.h>
  15
  16 #include "packet-bluetooth.h"
  17
  18 static int proto_hci_h1;
  19
  20 static int hf_hci_h1_direction;
  21
  22 static int ett_hci_h1;
  23
  24 static dissector_table_t hci_h1_table;
  25
  26 static dissector_handle_t hci_h1_handle;
  27
  28 static const value_string hci_h1_type_vals[] = {
  29     {BTHCI_CHANNEL_COMMAND, "HCI Command"},
  30     {BTHCI_CHANNEL_ACL,     "ACL Data"},
  31     {BTHCI_CHANNEL_SCO,     "SCO Data"},
  32     {BTHCI_CHANNEL_EVENT,   "HCI Event"},
  33     {BTHCI_CHANNEL_ISO,     "ISO Data"},
  34     {0, NULL }
  35 };
  36 static const value_string hci_h1_direction_vals[] = {
  37     {-1, "Unknown"},
  38     {0,    "Sent"},
  39     {1,    "Rcvd"},
  40     {0, NULL}
  41 };
  42
  43 void proto_register_hci_h1(void);
  44 void proto_reg_handoff_hci_h1(void);
  45
  46 static int
  47 dissect_hci_h1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
  48 {
  49     uint8_t            type;
  50     tvbuff_t          *next_tvb;
  51     proto_item        *ti = NULL;
  52     proto_tree        *hci_h1_tree = NULL;
  53     bluetooth_data_t  *bluetooth_data;
  54
  55     bluetooth_data = (bluetooth_data_t *) data;
  56
  57     col_set_str(pinfo->cinfo, COL_PROTOCOL, "HCI");
  58
  59     col_clear(pinfo->cinfo, COL_INFO);
  60
  61     DISSECTOR_ASSERT(bluetooth_data->previous_protocol_data_type == BT_PD_BTHCI);
  62     type = bluetooth_data->previous_protocol_data.bthci->channel;
  63
  64     if (tree) {
  65         ti = proto_tree_add_item(tree, proto_hci_h1, tvb, 0, 0, ENC_NA);
  66         hci_h1_tree = proto_item_add_subtree(ti, ett_hci_h1);
  67
  68         if(pinfo->p2p_dir == P2P_DIR_SENT ||
  69            pinfo->p2p_dir == P2P_DIR_RECV)
  70             proto_item_append_text(hci_h1_tree, " %s %s",
  71                            val_to_str(pinfo->p2p_dir,
  72                               hci_h1_direction_vals, "Unknown: %d"),
  73                            val_to_str(type,
  74                               hci_h1_type_vals,
  75                               "Unknown 0x%02x"));
  76         else
  77             proto_item_append_text(hci_h1_tree, " %s",
  78                            val_to_str(type,
  79                               hci_h1_type_vals,
  80                               "Unknown 0x%02x"));
  81     }
  82
  83     if(pinfo->p2p_dir == P2P_DIR_SENT ||
  84        pinfo->p2p_dir == P2P_DIR_RECV)
  85         col_add_fstr(pinfo->cinfo, COL_INFO, "%s %s",
  86                  val_to_str(pinfo->p2p_dir,
  87                     hci_h1_direction_vals, "Unknown: %d"),
  88                      val_to_str(type, hci_h1_type_vals,
  89                     "Unknown 0x%02x"));
  90     else
  91         col_add_str(pinfo->cinfo, COL_INFO,
  92                  val_to_str(type, hci_h1_type_vals,
  93                     "Unknown 0x%02x"));
  94
  95     ti = proto_tree_add_int(hci_h1_tree, hf_hci_h1_direction, tvb, 0, 0, pinfo->p2p_dir);
  96     proto_item_set_generated(ti);
  97
  98     next_tvb = tvb_new_subset_remaining(tvb, 0);
  99     if (!dissector_try_uint_with_data(hci_h1_table, type, next_tvb, pinfo, tree, true, bluetooth_data)) {
 100         call_data_dissector(next_tvb, pinfo, tree);
 101     }
 102
 103     return tvb_reported_length(tvb);
 104 }
 105
 106
 107 void
 108 proto_register_hci_h1(void)
 109 {
 110     static hf_register_info hf[] = {
 111         { &hf_hci_h1_direction,
 112             { "Direction",           "hci_h1.direction",
 113             FT_INT8, BASE_DEC, VALS(hci_h1_direction_vals), 0x0,
 114             "HCI Packet Direction Sent/Rcvd/Unknown", HFILL }
 115         }
 116     };
 117
 118     static int *ett[] = {
 119         &ett_hci_h1,
 120     };
 121
 122     proto_hci_h1 = proto_register_protocol("Bluetooth HCI H1",
 123             "HCI_H1", "hci_h1");
 124
 125     hci_h1_handle = register_dissector("hci_h1", dissect_hci_h1, proto_hci_h1);
 126
 127     proto_register_field_array(proto_hci_h1, hf, array_length(hf));
 128     proto_register_subtree_array(ett, array_length(ett));
 129
 130     hci_h1_table = register_dissector_table("hci_h1.type",
 131             "HCI h1 pdu type", proto_hci_h1, FT_UINT8, BASE_HEX);
 132 }
 133
 134 void
 135 proto_reg_handoff_hci_h1(void)
 136 {
 137     dissector_add_uint("bluetooth.encap", WTAP_ENCAP_BLUETOOTH_HCI, hci_h1_handle);
 138 }
 139
 140 /*
 141  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 142  *
 143  * Local variables:
 144  * c-basic-offset: 4
 145  * tab-width: 8
 146  * indent-tabs-mode: nil
 147  * End:
 148  *
 149  * vi: set shiftwidth=4 tabstop=8 expandtab:
 150  * :indentSize=4:tabSize=8:noTabs=true:
 151  */