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wireshark/epan/dissectors/packet-bthci_iso.c

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/* packet-bthci_iso.c
* Routines for the Bluetooth ISO dissection
* Copyright 2020, Jakub Pawlowski <jpawlowski@google.com>
* Copyright 2020, Allan M. Madsen <almomadk@gmail.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/addr_resolv.h>
#include <epan/expert.h>
#include "packet-bluetooth.h"
#include "packet-bthci_iso.h"
/* Initialize the protocol and registered fields */
static int proto_bthci_iso = -1;
static int hf_bthci_iso_chandle = -1;
static int hf_bthci_iso_pb_flag = -1;
static int hf_bthci_iso_ts_flag = -1;
static int hf_bthci_iso_reserved = -1;
static int hf_bthci_iso_data_length = -1;
static int hf_bthci_iso_data = -1;
static int hf_bthci_iso_continuation_to = -1;
static int hf_bthci_iso_reassembled_in = -1;
static int hf_bthci_iso_connect_in = -1;
static int hf_bthci_iso_disconnect_in = -1;
static int proto_bthci_iso_data = -1;
static int hf_bthci_iso_data_timestamp = -1;
static int hf_bthci_iso_data_packet_seq_num = -1;
static int hf_bthci_iso_data_sdu_length = -1;
static int hf_bthci_iso_data_status_flag = -1;
static int hf_bthci_iso_data_sdu = -1;
/* Initialize the subtree pointers */
static gint ett_bthci_iso = -1;
static gint ett_bthci_iso_data = -1;
static expert_field ei_length_bad = EI_INIT;
static dissector_handle_t bthci_iso_handle;
static dissector_handle_t bthci_iso_data_handle;
static gboolean iso_reassembly = TRUE;
typedef struct _multi_fragment_pdu_t {
guint32 first_frame;
guint32 last_frame;
guint16 tot_len;
char *reassembled;
int cur_off; /* counter used by reassembly */
} multi_fragment_pdu_t;
typedef struct _chandle_data_t {
wmem_tree_t *start_fragments; /* indexed by pinfo->num */
} chandle_data_t;
static wmem_tree_t *chandle_tree = NULL;
static const value_string iso_pb_flag_vals[] = {
{ 0x00, "First SDU Fragment"},
{ 0x01, "Continuation SDU Fragment"},
{ 0x02, "Complete SDU"},
{ 0x03, "Last SDU Fragment"},
{ 0x00, NULL}
};
static const value_string iso_data_status_vals[] = {
{ 0x00, "Valid"},
{ 0x01, "Possibly Invalid"},
{ 0x02, "Lost Data"},
{ 0x00, NULL}
};
void proto_register_bthci_iso(void);
void proto_reg_handoff_bthci_iso(void);
void proto_register_iso_data(void);
typedef struct _iso_data_info_t {
guint16 handle;
gboolean timestamp_present;
} iso_data_info_t;
/* Code to actually dissect the packets */
static gint
dissect_bthci_iso(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
proto_item *bthci_iso_item;
proto_tree *bthci_iso_tree;
proto_item *sub_item;
guint16 flags;
guint16 pb_flag = FALSE;
guint16 length;
gboolean fragmented = FALSE;
gint offset = 0;
tvbuff_t *next_tvb;
chandle_data_t *chandle_data;
bluetooth_data_t *bluetooth_data;
wmem_tree_key_t key[6];
guint32 k_connection_handle = 0;
guint32 k_stream_handle;
guint32 k_frame_number;
guint32 k_interface_id;
guint32 k_adapter_id;
guint32 direction;
remote_bdaddr_t *remote_bdaddr;
const gchar *localhost_name;
guint8 *localhost_bdaddr;
const gchar *localhost_ether_addr;
gchar *localhost_addr_name;
gint localhost_length;
localhost_bdaddr_entry_t *localhost_bdaddr_entry;
localhost_name_entry_t *localhost_name_entry;
chandle_session_t *chandle_session;
wmem_tree_t *subtree;
stream_connection_handle_pair_t *handle_pairs;
iso_data_info_t iso_data_info;
/* Reject the packet if data is NULL */
if (data == NULL)
return 0;
bthci_iso_item = proto_tree_add_item(tree, proto_bthci_iso, tvb, offset, -1, ENC_NA);
bthci_iso_tree = proto_item_add_subtree(bthci_iso_item, ett_bthci_iso);
switch (pinfo->p2p_dir) {
case P2P_DIR_SENT:
col_set_str(pinfo->cinfo, COL_INFO, "Sent ");
break;
case P2P_DIR_RECV:
col_set_str(pinfo->cinfo, COL_INFO, "Rcvd ");
break;
default:
col_set_str(pinfo->cinfo, COL_INFO, "UnknownDirection ");
break;
}
col_set_str(pinfo->cinfo, COL_PROTOCOL, "HCI_ISO");
flags = tvb_get_letohs(tvb, offset);
pb_flag = (flags >> 12) & 0x3;
iso_data_info.timestamp_present = (flags >> 14) & 0x1;
iso_data_info.handle = flags & 0xfff;
proto_tree_add_item(bthci_iso_tree, hf_bthci_iso_chandle, tvb, offset, 2, ENC_LITTLE_ENDIAN);
proto_tree_add_item(bthci_iso_tree, hf_bthci_iso_pb_flag, tvb, offset, 2, ENC_LITTLE_ENDIAN);
proto_tree_add_item(bthci_iso_tree, hf_bthci_iso_ts_flag, tvb, offset, 2, ENC_LITTLE_ENDIAN);
proto_tree_add_item(bthci_iso_tree, hf_bthci_iso_reserved, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
length = tvb_get_letohs(tvb, offset);
sub_item = proto_tree_add_item(bthci_iso_tree, hf_bthci_iso_data_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
/* determine if packet is fragmented */
if (pb_flag != 0x2) {
fragmented = TRUE;
}
bluetooth_data = (bluetooth_data_t *) data;
DISSECTOR_ASSERT(bluetooth_data);
k_interface_id = bluetooth_data->interface_id;
k_adapter_id = bluetooth_data->adapter_id;
k_stream_handle = flags & 0x0fff;
direction = pinfo->p2p_dir;
k_frame_number = pinfo->num;
key[0].length = 1;
key[0].key = &k_interface_id;
key[1].length = 1;
key[1].key = &k_adapter_id;
key[2].length = 1;
key[2].key = &k_stream_handle;
key[3].length = 0;
key[3].key = NULL;
subtree = (wmem_tree_t *) wmem_tree_lookup32_array(bluetooth_data->chandle_sessions, key);
chandle_session = (subtree) ? (chandle_session_t *) wmem_tree_lookup32_le(subtree, pinfo->num) : NULL;
if (!(chandle_session &&
chandle_session->connect_in_frame < pinfo->num &&
chandle_session->disconnect_in_frame > pinfo->num)){
chandle_session = NULL;
}
/* replace stream (CIS/BIS) handle with connection (ACL) handle */
subtree = (wmem_tree_t *) wmem_tree_lookup32_array(bluetooth_data->shandle_to_chandle, key);
handle_pairs = (subtree) ? (stream_connection_handle_pair_t *) wmem_tree_lookup32_le(subtree, pinfo->num) : NULL;
if (handle_pairs) {
k_connection_handle = handle_pairs->chandle;
key[2].key = &k_connection_handle;
}
key[3].length = 1;
key[3].key = &k_frame_number;
key[4].length = 0;
key[4].key = NULL;
/* remote bdaddr and name */
remote_bdaddr = (remote_bdaddr_t *)wmem_tree_lookup32_array_le(bluetooth_data->chandle_to_bdaddr, key);
/*
* XXX - do this only if we found a handle pair, so that we have
* a connection handle?
*/
if (remote_bdaddr && remote_bdaddr->interface_id == bluetooth_data->interface_id &&
remote_bdaddr->adapter_id == bluetooth_data->adapter_id &&
remote_bdaddr->chandle == k_connection_handle) {
guint32 k_bd_addr_oui;
guint32 k_bd_addr_id;
guint32 bd_addr_oui;
guint32 bd_addr_id;
device_name_t *device_name;
const gchar *remote_name;
const gchar *remote_ether_addr;
gchar *remote_addr_name;
gint remote_length;
bd_addr_oui = remote_bdaddr->bd_addr[0] << 16 | remote_bdaddr->bd_addr[1] << 8 | remote_bdaddr->bd_addr[2];
bd_addr_id = remote_bdaddr->bd_addr[3] << 16 | remote_bdaddr->bd_addr[4] << 8 | remote_bdaddr->bd_addr[5];
k_bd_addr_oui = bd_addr_oui;
k_bd_addr_id = bd_addr_id;
k_frame_number = pinfo->num;
key[0].length = 1;
key[0].key = &k_interface_id;
key[1].length = 1;
key[1].key = &k_adapter_id;
key[2].length = 1;
key[2].key = &k_bd_addr_id;
key[3].length = 1;
key[3].key = &k_bd_addr_oui;
key[4].length = 1;
key[4].key = &k_frame_number;
key[5].length = 0;
key[5].key = NULL;
device_name = (device_name_t *)wmem_tree_lookup32_array_le(bluetooth_data->bdaddr_to_name, key);
if (device_name && device_name->bd_addr_oui == bd_addr_oui && device_name->bd_addr_id == bd_addr_id)
remote_name = device_name->name;
else
remote_name = "";
remote_ether_addr = get_ether_name(remote_bdaddr->bd_addr);
remote_length = (gint)(strlen(remote_ether_addr) + 3 + strlen(remote_name) + 1);
remote_addr_name = (gchar *)wmem_alloc(pinfo->pool, remote_length);
snprintf(remote_addr_name, remote_length, "%s (%s)", remote_ether_addr, remote_name);
if (pinfo->p2p_dir == P2P_DIR_RECV) {
set_address(&pinfo->net_src, AT_STRINGZ, (int)strlen(remote_name) + 1, remote_name);
set_address(&pinfo->dl_src, AT_ETHER, 6, remote_bdaddr->bd_addr);
set_address(&pinfo->src, AT_STRINGZ, (int)strlen(remote_addr_name) + 1, remote_addr_name);
} else if (pinfo->p2p_dir == P2P_DIR_SENT) {
set_address(&pinfo->net_dst, AT_STRINGZ, (int)strlen(remote_name) + 1, remote_name);
set_address(&pinfo->dl_dst, AT_ETHER, 6, remote_bdaddr->bd_addr);
set_address(&pinfo->dst, AT_STRINGZ, (int)strlen(remote_addr_name) + 1, remote_addr_name);
}
} else {
if (pinfo->p2p_dir == P2P_DIR_RECV) {
set_address(&pinfo->net_src, AT_STRINGZ, 1, "");
set_address(&pinfo->dl_src, AT_STRINGZ, 1, "");
set_address(&pinfo->src, AT_STRINGZ, 10, "remote ()");
} else if (pinfo->p2p_dir == P2P_DIR_SENT) {
set_address(&pinfo->net_dst, AT_STRINGZ, 1, "");
set_address(&pinfo->dl_dst, AT_STRINGZ, 1, "");
set_address(&pinfo->dst, AT_STRINGZ, 10, "remote ()");
}
}
/* localhost bdaddr and name */
key[0].length = 1;
key[0].key = &k_interface_id;
key[1].length = 1;
key[1].key = &k_adapter_id;
key[2].length = 1;
key[2].key = &k_frame_number;
key[3].length = 0;
key[3].key = NULL;
localhost_bdaddr_entry = (localhost_bdaddr_entry_t *)wmem_tree_lookup32_array_le(bluetooth_data->localhost_bdaddr, key);
localhost_bdaddr = (guint8 *) wmem_alloc(pinfo->pool, 6);
if (localhost_bdaddr_entry && localhost_bdaddr_entry->interface_id == bluetooth_data->interface_id &&
localhost_bdaddr_entry->adapter_id == bluetooth_data->adapter_id) {
localhost_ether_addr = get_ether_name(localhost_bdaddr_entry->bd_addr);
memcpy(localhost_bdaddr, localhost_bdaddr_entry->bd_addr, 6);
} else {
localhost_ether_addr = "localhost";
/* XXX - is this the right value to use? */
memset(localhost_bdaddr, 0, 6);
}
localhost_name_entry = (localhost_name_entry_t *)wmem_tree_lookup32_array_le(bluetooth_data->localhost_name, key);
if (localhost_name_entry && localhost_name_entry->interface_id == bluetooth_data->interface_id &&
localhost_name_entry->adapter_id == bluetooth_data->adapter_id)
localhost_name = localhost_name_entry->name;
else
localhost_name = "";
localhost_length = (gint)(strlen(localhost_ether_addr) + 3 + strlen(localhost_name) + 1);
localhost_addr_name = (gchar *)wmem_alloc(pinfo->pool, localhost_length);
snprintf(localhost_addr_name, localhost_length, "%s (%s)", localhost_ether_addr, localhost_name);
if (pinfo->p2p_dir == P2P_DIR_RECV) {
set_address(&pinfo->net_dst, AT_STRINGZ, (int)strlen(localhost_name) + 1, localhost_name);
set_address(&pinfo->dl_dst, AT_ETHER, 6, localhost_bdaddr);
set_address(&pinfo->dst, AT_STRINGZ, (int)strlen(localhost_addr_name) + 1, localhost_addr_name);
} else if (pinfo->p2p_dir == P2P_DIR_SENT) {
set_address(&pinfo->net_src, AT_STRINGZ, (int)strlen(localhost_name) + 1, localhost_name);
set_address(&pinfo->dl_src, AT_ETHER, 6, localhost_bdaddr);
set_address(&pinfo->src, AT_STRINGZ, (int)strlen(localhost_addr_name) + 1, localhost_addr_name);
}
/* find the chandle_data structure associated with this chandle */
key[0].length = 1;
key[0].key = &k_interface_id;
key[1].length = 1;
key[1].key = &k_adapter_id;
key[2].length = 1;
key[2].key = &k_stream_handle;
key[3].length = 1;
key[3].key = &direction;
key[4].length = 0;
key[4].key = NULL;
subtree = (wmem_tree_t *) wmem_tree_lookup32_array(chandle_tree, key);
chandle_data = (subtree) ? (chandle_data_t *) wmem_tree_lookup32_le(subtree, pinfo->num) : NULL;
if (!pinfo->fd->visited && !chandle_data) {
key[0].length = 1;
key[0].key = &k_interface_id;
key[1].length = 1;
key[1].key = &k_adapter_id;
key[2].length = 1;
key[2].key = &k_stream_handle;
key[3].length = 1;
key[3].key = &direction;
key[4].length = 1;
key[4].key = &k_frame_number;
key[5].length = 0;
key[5].key = NULL;
chandle_data = wmem_new(wmem_file_scope(), chandle_data_t);
chandle_data->start_fragments = wmem_tree_new(wmem_file_scope());
wmem_tree_insert32_array(chandle_tree, key, chandle_data);
} else if (pinfo->fd->visited && !chandle_data) {
DISSECTOR_ASSERT_HINT(0, "Impossible: no previously session saved");
}
if (!fragmented || (!iso_reassembly && !pb_flag)) {
/* call ISO data dissector for PDUs that are not fragmented
* also for the first fragment if reassembly is disabled
*/
if (length < tvb_captured_length_remaining(tvb, offset)) {
if (!fragmented)
expert_add_info(pinfo, sub_item, &ei_length_bad);
/* Try to dissect as much as possible */
length = tvb_captured_length_remaining(tvb, offset);
}
next_tvb = tvb_new_subset_length_caplen(tvb, offset, tvb_captured_length_remaining(tvb, offset), length);
call_dissector_with_data(bthci_iso_data_handle, next_tvb, pinfo, tree, &iso_data_info);
} else if (fragmented && iso_reassembly) {
multi_fragment_pdu_t *mfp = NULL;
gint len;
if (pb_flag == 0x00) { /* first fragment */
if (!pinfo->fd->visited) {
gint timestamp_size = 0;
mfp = (multi_fragment_pdu_t *) wmem_new(wmem_file_scope(), multi_fragment_pdu_t);
mfp->first_frame = pinfo->num;
mfp->last_frame = 0;
mfp->tot_len = 4;
len = tvb_captured_length_remaining(tvb, offset);
if (flags & 0x4000) { /* 4 byte timestamp is present */
timestamp_size = 4;
}
mfp->tot_len += timestamp_size + (tvb_get_letohs(tvb, offset + 2 + timestamp_size) & 0xfff);
mfp->reassembled = (char *) wmem_alloc(wmem_file_scope(), mfp->tot_len);
if (len <= mfp->tot_len) {
tvb_memcpy(tvb, (guint8 *) mfp->reassembled, offset, len);
mfp->cur_off = len;
wmem_tree_insert32(chandle_data->start_fragments, pinfo->num, mfp);
}
} else {
mfp = (multi_fragment_pdu_t *)wmem_tree_lookup32(chandle_data->start_fragments, pinfo->num);
}
if (mfp != NULL && mfp->last_frame) {
proto_item *item;
item = proto_tree_add_uint(bthci_iso_tree, hf_bthci_iso_reassembled_in, tvb, 0, 0, mfp->last_frame);
proto_item_set_generated(item);
col_append_frame_number(pinfo, COL_INFO, " [Reassembled in #%u]", mfp->last_frame);
}
}
else if (pb_flag & 0x01) { /* continuation/last fragment */
mfp = (multi_fragment_pdu_t *)wmem_tree_lookup32_le(chandle_data->start_fragments, pinfo->num);
if (!pinfo->fd->visited) {
len = tvb_captured_length_remaining(tvb, offset);
if (mfp != NULL && !mfp->last_frame) {
int avail = (int)mfp->tot_len - mfp->cur_off;
if (len > avail) {
expert_add_info(pinfo, sub_item, &ei_length_bad);
/* Try to reassemble as much as possible */
len = avail;
}
tvb_memcpy(tvb, (guint8 *) mfp->reassembled + mfp->cur_off, offset, len);
mfp->cur_off += len;
if (pb_flag == 0x03)
mfp->last_frame = pinfo->num;
}
}
if (mfp) {
proto_item *item;
item = proto_tree_add_uint(bthci_iso_tree, hf_bthci_iso_continuation_to, tvb, 0, 0, mfp->first_frame);
proto_item_set_generated(item);
col_append_frame_number(pinfo, COL_INFO, " [Continuation to #%u]", mfp->first_frame);
if (mfp->last_frame && mfp->last_frame != pinfo->num) {
item = proto_tree_add_uint(bthci_iso_tree, hf_bthci_iso_reassembled_in, tvb, 0, 0, mfp->last_frame);
proto_item_set_generated(item);
col_append_frame_number(pinfo, COL_INFO, " [Reassembled in #%u]", mfp->last_frame);
}
if (pb_flag == 0x03) { /* last fragment */
next_tvb = tvb_new_child_real_data(tvb, (guint8 *) mfp->reassembled, mfp->tot_len, mfp->tot_len);
add_new_data_source(pinfo, next_tvb, "Reassembled BTHCI ISO");
call_dissector_with_data(bthci_iso_data_handle, next_tvb, pinfo, tree, &iso_data_info);
}
}
}
}
if (tvb_captured_length_remaining(tvb, offset) > 0) {
sub_item = proto_tree_add_item(bthci_iso_tree, hf_bthci_iso_data, tvb, offset, -1, ENC_NA);
if (fragmented) {
proto_item_append_text(sub_item, " Fragment");
}
}
if (chandle_session) {
sub_item = proto_tree_add_uint(bthci_iso_tree, hf_bthci_iso_connect_in, tvb, 0, 0, chandle_session->connect_in_frame);
proto_item_set_generated(sub_item);
if (chandle_session->disconnect_in_frame < G_MAXUINT32) {
sub_item = proto_tree_add_uint(bthci_iso_tree, hf_bthci_iso_disconnect_in, tvb, 0, 0, chandle_session->disconnect_in_frame);
proto_item_set_generated(sub_item);
}
}
return tvb_reported_length(tvb);
}
void
proto_register_bthci_iso(void)
{
module_t *bthci_iso_module;
expert_module_t *bthci_iso_expert_module;
static hf_register_info hf[] = {
{ &hf_bthci_iso_chandle,
{ "Connection Handle", "bthci_iso.chandle",
FT_UINT16, BASE_HEX, NULL, 0x0FFF,
NULL, HFILL }
},
{ &hf_bthci_iso_pb_flag,
{ "PB Flag", "bthci_iso.pb_flag",
FT_UINT16, BASE_HEX, VALS(iso_pb_flag_vals), 0x3000,
"Packet Boundary Flag", HFILL }
},
{ &hf_bthci_iso_ts_flag,
{ "Timestamp present", "bthci_iso.ts_flag",
FT_BOOLEAN, 16, NULL, 0x4000,
NULL, HFILL }
},
{ &hf_bthci_iso_reserved,
{ "Reserved", "bthci_iso.reserved",
FT_UINT16, BASE_HEX, NULL, 0x8000,
NULL, HFILL }
},
{ &hf_bthci_iso_continuation_to,
{ "This is a continuation to the PDU in frame", "bthci_iso.continuation_to",
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
"This is a continuation to the PDU in frame #", HFILL }
},
{ &hf_bthci_iso_reassembled_in,
{ "This PDU is reassembled in frame", "bthci_iso.reassembled_in",
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
"This PDU is reassembled in frame #", HFILL }
},
{ &hf_bthci_iso_connect_in,
{ "Connect in frame", "bthci_iso.connect_in",
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_bthci_iso_disconnect_in,
{ "Disconnect in frame", "bthci_iso.disconnect_in",
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_bthci_iso_data_length,
{ "Data Length", "bthci_iso.data_length",
FT_UINT16, BASE_DEC, NULL, 0x3FFF,
NULL, HFILL }
},
{ &hf_bthci_iso_data,
{ "Data", "bthci_iso.data",
FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_bthci_iso,
};
static ei_register_info ei[] = {
{ &ei_length_bad, { "bthci_iso.length.bad", PI_MALFORMED, PI_WARN, "Invalid length", EXPFILL }},
};
/* Register the protocol name and description */
proto_bthci_iso = proto_register_protocol("Bluetooth HCI ISO Packet", "HCI_ISO", "bthci_iso");
bthci_iso_handle = register_dissector("bthci_iso", dissect_bthci_iso, proto_bthci_iso);
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_bthci_iso, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
bthci_iso_expert_module = expert_register_protocol(proto_bthci_iso);
expert_register_field_array(bthci_iso_expert_module, ei, array_length(ei));
/* Register configuration preferences */
bthci_iso_module = prefs_register_protocol_subtree("Bluetooth", proto_bthci_iso, NULL);
prefs_register_bool_preference(bthci_iso_module, "hci_iso_reassembly",
"Reassemble ISO Fragments",
"Whether the ISO dissector should reassemble fragmented PDUs",
&iso_reassembly);
chandle_tree = wmem_tree_new_autoreset(wmem_epan_scope(), wmem_file_scope());
}
void
proto_reg_handoff_bthci_iso(void)
{
dissector_add_uint("hci_h4.type", HCI_H4_TYPE_ISO, bthci_iso_handle);
dissector_add_uint("hci_h1.type", BTHCI_CHANNEL_ISO, bthci_iso_handle);
}
static gint
dissect_iso_data(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
proto_item *iso_data_load_item;
proto_tree *iso_data_load_tree;
gint remaining;
guint16 seq_no, sdu_length;
iso_data_info_t *iso_data_info = (iso_data_info_t *) data;
int offset = 0;
iso_data_load_item = proto_tree_add_item(tree, proto_bthci_iso_data, tvb, offset, -1, ENC_NA);
iso_data_load_tree = proto_item_add_subtree(iso_data_load_item, ett_bthci_iso_data);
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISO Data");
if (iso_data_info->timestamp_present) {
proto_tree_add_item(iso_data_load_tree, hf_bthci_iso_data_timestamp, tvb, offset, 4, ENC_LITTLE_ENDIAN);
offset += 4;
}
seq_no = tvb_get_letohs(tvb, offset);
proto_tree_add_item(iso_data_load_tree, hf_bthci_iso_data_packet_seq_num, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
sdu_length = tvb_get_letohs(tvb, offset);
proto_tree_add_item(iso_data_load_tree, hf_bthci_iso_data_sdu_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
col_add_fstr(pinfo->cinfo, COL_INFO, "Handle: 0x%x, SeqNo: %d, SDU length: %d", iso_data_info->handle, seq_no, sdu_length);
if (pinfo->p2p_dir == P2P_DIR_RECV) {
guint16 status = tvb_get_letohs(tvb, offset) >> 14;
proto_tree_add_item(iso_data_load_tree, hf_bthci_iso_data_status_flag, tvb, offset, 2, ENC_LITTLE_ENDIAN);
col_append_fstr(pinfo->cinfo, COL_INFO, ", Status: %s", val_to_str_const(status, VALS(iso_data_status_vals), "RFU"));
}
offset += 2;
remaining = tvb_captured_length_remaining(tvb, offset);
if (remaining > 0) {
proto_item *item;
item = proto_tree_add_item(iso_data_load_tree, hf_bthci_iso_data_sdu, tvb, offset, -1, ENC_NA);
if (remaining < sdu_length)
proto_item_append_text(item, " (Incomplete)");
offset += remaining;
}
return offset;
}
void
proto_register_iso_data(void)
{
static hf_register_info hf[] = {
{ &hf_bthci_iso_data_timestamp,
{ "Timestamp", "bthci_iso_data.timestamp",
FT_UINT32, BASE_DEC|BASE_UNIT_STRING, &units_microseconds, 0x0,
NULL, HFILL }
},
{ &hf_bthci_iso_data_packet_seq_num,
{ "Sequence Number", "bthci_iso_data.packet_seq_num",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_bthci_iso_data_sdu_length,
{ "SDU Length", "bthci_iso_data.sdu_length",
FT_UINT16, BASE_DEC, NULL, 0x0FFF,
NULL, HFILL }
},
{ &hf_bthci_iso_data_status_flag,
{ "Data Status Flag", "bthci_iso_data.status_flag",
FT_UINT16, BASE_DEC, VALS(iso_data_status_vals), 0xC000,
NULL, HFILL }
},
{ &hf_bthci_iso_data_sdu,
{ "SDU", "bthci_iso_data.sdu",
FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
};
static gint *ett[] = {
&ett_bthci_iso_data
};
proto_bthci_iso_data = proto_register_protocol("Bluetooth ISO Data", "BT ISO Data", "bthci_iso_data");
proto_register_field_array(proto_bthci_iso_data, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
bthci_iso_data_handle = register_dissector("bthci_iso_data", dissect_iso_data, proto_bthci_iso_data);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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