[RFC v2 05/12] core: Add initial implementation of DeviceSet interface

Luiz Augusto von Dentz
2023-03-07T22:25:39Z

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

This adds the initial implementation of DeviceSet interface as
documented in doc/set-api.rst.
---
Makefile.am | 3 +-
src/adapter.c | 6 +-
src/device.c | 283 +++++++++++++++++++++++++++++++++++++-
src/device.h | 11 +-
src/set.c | 371 ++++++++++++++++++++++++++++++++++++++++++++++++++
src/set.h | 20 +++
6 files changed, 683 insertions(+), 11 deletions(-)
create mode 100644 src/set.c
create mode 100644 src/set.h

diff --git a/Makefile.am b/Makefile.am
index 0e8cce249c7d..7b010c8159e9 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -326,7 +326,8 @@ src_bluetoothd_SOURCES = $(builtin_sources) \
src/eir.h src/eir.c \
src/adv_monitor.h src/adv_monitor.c \
src/battery.h src/battery.c \
- src/settings.h src/settings.c
+ src/settings.h src/settings.c \
+ src/set.h src/set.c
src_bluetoothd_LDADD = lib/libbluetooth-internal.la \
gdbus/libgdbus-internal.la \
src/libshared-glib.la \
diff --git a/src/adapter.c b/src/adapter.c
index 538310c1ddc6..ae0eb364bad5 100644
--- a/src/adapter.c
+++ b/src/adapter.c
@@ -4387,8 +4387,8 @@ static void load_ltks(struct btd_adapter *adapter, GSList *keys)
if (dev) {
device_set_paired(dev, info->bdaddr_type);
device_set_bonded(dev, info->bdaddr_type);
- device_set_ltk_enc_size(dev, info->enc_size);
- device_set_ltk_enc_size(dev, info->enc_size);
+ device_set_ltk(dev, info->val, info->central,
+ info->enc_size);
}
}

@@ -8657,7 +8657,7 @@ static void new_long_term_key_callback(uint16_t index, uint16_t length,
device_set_bonded(device, addr->type);
}

- device_set_ltk_enc_size(device, ev->key.enc_size);
+ device_set_ltk(device, ev->key.val, ev->key.central, ev->key.enc_size);

bonding_complete(adapter, &addr->bdaddr, addr->type, 0);
}
diff --git a/src/device.c b/src/device.c
index cb16d37c1ae1..df50ce7b4f6c 100644
--- a/src/device.c
+++ b/src/device.c
@@ -64,6 +64,7 @@
#include "storage.h"
#include "eir.h"
#include "settings.h"
+#include "set.h"

#define DISCONNECT_TIMER 2
#define DISCOVERY_TIMER 1
@@ -159,11 +160,25 @@ struct bearer_state {
time_t last_seen;
};

+struct ltk_info {
+ uint8_t key[16];
+ bool central;
+ uint8_t enc_size;
+};
+
struct csrk_info {
uint8_t key[16];
uint32_t counter;
};

+struct sirk_info {
+ struct btd_device_set *set;
+ uint8_t encrypted;
+ uint8_t key[16];
+ uint8_t size;
+ uint8_t rank;
+};
+
enum {
WAKE_FLAG_DEFAULT = 0,
WAKE_FLAG_ENABLED,
@@ -253,7 +268,8 @@ struct btd_device {

struct csrk_info *local_csrk;
struct csrk_info *remote_csrk;
- uint8_t ltk_enc_size;
+ struct ltk_info *ltk;
+ struct queue *sirks;

sdp_list_t *tmp_records;

@@ -386,6 +402,24 @@ static void store_csrk(struct csrk_info *csrk, GKeyFile *key_file,
g_key_file_set_integer(key_file, group, "Counter", csrk->counter);
}

+static void store_sirk(struct sirk_info *sirk, GKeyFile *key_file,
+ uint8_t index)
+{
+ char group[28];
+ char key[33];
+ int i;
+
+ sprintf(group, "SetIdentityResolvingKey#%u", index);
+
+ for (i = 0; i < 16; i++)
+ sprintf(key + (i * 2), "%2.2X", sirk->key[i]);
+
+ g_key_file_set_boolean(key_file, group, "Encrypted", sirk->encrypted);
+ g_key_file_set_string(key_file, group, "Key", key);
+ g_key_file_set_integer(key_file, group, "Size", sirk->size);
+ g_key_file_set_integer(key_file, group, "Rank", sirk->rank);
+}
+
static gboolean store_device_info_cb(gpointer user_data)
{
struct btd_device *device = user_data;
@@ -483,6 +517,18 @@ static gboolean store_device_info_cb(gpointer user_data)
if (device->remote_csrk)
store_csrk(device->remote_csrk, key_file, "RemoteSignatureKey");

+ if (!queue_isempty(device->sirks)) {
+ const struct queue_entry *entry;
+ int i;
+
+ for (entry = queue_get_entries(device->sirks), i = 0; entry;
+ entry = entry->next, i++) {
+ struct sirk_info *sirk = entry->data;
+
+ store_sirk(sirk, key_file, i);
+ }
+ }
+
str = g_key_file_to_data(key_file, &length, NULL);
if (!g_file_set_contents(filename, str, length, &gerr)) {
error("Unable set contents for %s: (%s)", filename,
@@ -804,8 +850,11 @@ static void device_free(gpointer user_data)
if (device->eir_uuids)
g_slist_free_full(device->eir_uuids, g_free);

+ queue_destroy(device->sirks, free);
+
g_free(device->local_csrk);
g_free(device->remote_csrk);
+ free(device->ltk);
g_free(device->path);
g_free(device->alias);
free(device->modalias);
@@ -1607,6 +1656,62 @@ static gboolean dev_property_wake_allowed_exist(
return device_get_wake_support(device);
}

+static void append_set(void *data, void *user_data)
+{
+ struct sirk_info *info = data;
+ const char *path = btd_set_get_path(info->set);
+ DBusMessageIter *iter = user_data;
+ DBusMessageIter entry, dict;
+
+ dbus_message_iter_open_container(iter, DBUS_TYPE_DICT_ENTRY, NULL,
+ &entry);
+
+ dbus_message_iter_append_basic(&entry, DBUS_TYPE_OBJECT_PATH, &path);
+
+ dbus_message_iter_open_container(&entry, DBUS_TYPE_ARRAY,
+ DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
+ DBUS_TYPE_STRING_AS_STRING
+ DBUS_TYPE_VARIANT_AS_STRING
+ DBUS_DICT_ENTRY_END_CHAR_AS_STRING, &dict);
+
+ g_dbus_dict_append_entry(&dict, "Rank", DBUS_TYPE_BYTE, &info->rank);
+
+ dbus_message_iter_close_container(&entry, &dict);
+ dbus_message_iter_close_container(iter, &entry);
+}
+
+static gboolean dev_property_get_set(const GDBusPropertyTable *property,
+ DBusMessageIter *iter, void *data)
+{
+ struct btd_device *device = data;
+ DBusMessageIter array;
+
+ dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY,
+ DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
+ DBUS_TYPE_OBJECT_PATH_AS_STRING
+ DBUS_TYPE_ARRAY_AS_STRING
+ DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
+ DBUS_TYPE_STRING_AS_STRING
+ DBUS_TYPE_VARIANT_AS_STRING
+ DBUS_DICT_ENTRY_END_CHAR_AS_STRING
+ DBUS_DICT_ENTRY_END_CHAR_AS_STRING,
+ &array);
+
+ queue_foreach(device->sirks, append_set, &array);
+
+ dbus_message_iter_close_container(iter, &array);
+
+ return TRUE;
+}
+
+static gboolean dev_property_set_exists(const GDBusPropertyTable *property,
+ void *data)
+{
+ struct btd_device *device = data;
+
+ return !queue_isempty(device->sirks);
+}
+
static bool disconnect_all(gpointer user_data)
{
struct btd_device *device = user_data;
@@ -1792,10 +1897,97 @@ bool device_is_disconnecting(struct btd_device *device)
return device->disconn_timer > 0;
}

-void device_set_ltk_enc_size(struct btd_device *device, uint8_t enc_size)
+static void add_set(void *data, void *user_data)
{
- device->ltk_enc_size = enc_size;
- bt_att_set_enc_key_size(device->att, device->ltk_enc_size);
+ struct sirk_info *sirk = data;
+ struct btd_device *device = user_data;
+ struct btd_device_set *set;
+
+ if (!sirk->encrypted)
+ return;
+
+ set = btd_set_add_device(device, device->ltk->key, sirk->key,
+ sirk->size);
+ if (!set)
+ return;
+
+ if (sirk->set != set) {
+ sirk->set = set;
+ g_dbus_emit_property_changed(dbus_conn, device->path,
+ DEVICE_INTERFACE, "Sets");
+ }
+}
+
+void device_set_ltk(struct btd_device *device, const uint8_t val[16],
+ bool central, uint8_t enc_size)
+{
+ if (!device->ltk)
+ device->ltk = new0(struct ltk_info, 1);
+
+ memcpy(device->ltk->key, val, sizeof(device->ltk->key));
+ device->ltk->central = central;
+ device->ltk->enc_size = enc_size;
+ bt_att_set_enc_key_size(device->att, enc_size);
+
+ /* Check if there is any set/sirk that needs decryption */
+ queue_foreach(device->sirks, add_set, device);
+}
+
+static bool match_sirk(const void *data, const void *match_data)
+{
+ const struct sirk_info *sirk = data;
+ const uint8_t *key = match_data;
+
+ return !memcmp(sirk->key, key, sizeof(sirk->key));
+}
+
+static struct sirk_info *device_add_sirk_info(struct btd_device *device,
+ bool encrypted, uint8_t key[16],
+ uint8_t size, uint8_t rank)
+{
+ struct sirk_info *sirk;
+
+ sirk = queue_find(device->sirks, match_sirk, key);
+ if (sirk)
+ return sirk;
+
+ sirk = new0(struct sirk_info, 1);
+ sirk->encrypted = encrypted;
+ memcpy(sirk->key, key, sizeof(sirk->key));
+ sirk->size = size;
+ sirk->rank = rank;
+
+ queue_push_tail(device->sirks, sirk);
+ store_device_info(device);
+
+ return sirk;
+}
+
+bool btd_device_add_set(struct btd_device *device, bool encrypted,
+ uint8_t key[16], uint8_t size, uint8_t rank)
+{
+ struct btd_device_set *set;
+ struct sirk_info *sirk;
+
+ if (encrypted && !device->ltk)
+ return false;
+
+ sirk = device_add_sirk_info(device, encrypted, key, size, rank);
+ if (!sirk)
+ return false;
+
+ set = btd_set_add_device(device, encrypted ? device->ltk->key : NULL,
+ key, size);
+ if (!set)
+ return false;
+
+ if (sirk->set != set) {
+ sirk->set = set;
+ g_dbus_emit_property_changed(dbus_conn, device->path,
+ DEVICE_INTERFACE, "Sets");
+ }
+
+ return true;
}

static void device_set_auto_connect(struct btd_device *device, gboolean enable)
@@ -2996,6 +3188,8 @@ static const GDBusPropertyTable device_properties[] = {
{ "WakeAllowed", "b", dev_property_get_wake_allowed,
dev_property_set_wake_allowed,
dev_property_wake_allowed_exist },
+ { "Sets", "a{oa{sv}}", dev_property_get_set, NULL,
+ dev_property_set_exists },
{ }
};

@@ -3290,6 +3484,63 @@ fail:
return NULL;
}

+static struct sirk_info *load_sirk(GKeyFile *key_file, uint8_t index)
+{
+ char group[28];
+ struct sirk_info *sirk;
+ char *str;
+ int i;
+
+ sprintf(group, "SetIdentityResolvingKey#%u", index);
+
+ str = g_key_file_get_string(key_file, group, "Key", NULL);
+ if (!str)
+ return NULL;
+
+ sirk = g_new0(struct sirk_info, 1);
+
+ for (i = 0; i < 16; i++) {
+ if (sscanf(str + (i * 2), "%2hhx", &sirk->key[i]) != 1)
+ goto fail;
+ }
+
+
+ sirk->encrypted = g_key_file_get_boolean(key_file, group, "Encrypted",
+ NULL);
+ sirk->size = g_key_file_get_integer(key_file, group, "Size", NULL);
+ sirk->rank = g_key_file_get_integer(key_file, group, "Rank", NULL);
+ g_free(str);
+
+ return sirk;
+
+fail:
+ g_free(str);
+ g_free(sirk);
+ return NULL;
+}
+
+static void load_sirks(struct btd_device *device, GKeyFile *key_file)
+{
+ struct sirk_info *sirk;
+ uint8_t i;
+
+ for (i = 0; i < UINT8_MAX; i++) {
+ sirk = load_sirk(key_file, i);
+ if (!sirk)
+ break;
+
+ queue_push_tail(device->sirks, sirk);
+
+ /* Only add DeviceSet object if sirk does need
+ * decryption otherwise it has to wait for the LTK in
+ * order to decrypt.
+ */
+ if (!sirk->encrypted)
+ btd_set_add_device(device, NULL, sirk->key,
+ sirk->size);
+ }
+}
+
static void load_services(struct btd_device *device, char **uuids)
{
char **uuid;
@@ -3430,6 +3681,8 @@ static void load_info(struct btd_device *device, const char *local,

device->local_csrk = load_csrk(key_file, "LocalSignatureKey");
device->remote_csrk = load_csrk(key_file, "RemoteSignatureKey");
+
+ load_sirks(device, key_file);
}

g_strfreev(techno);
@@ -3945,6 +4198,7 @@ static struct btd_device *device_new(struct btd_adapter *adapter,
}

device->adapter = adapter;
+ device->sirks = queue_new();
device->temporary = true;

device->db_id = gatt_db_register(device->db, gatt_service_added,
@@ -5207,7 +5461,9 @@ static void gatt_server_init(struct btd_device *device,
return;
}

- bt_att_set_enc_key_size(device->att, device->ltk_enc_size);
+ if (device->ltk)
+ bt_att_set_enc_key_size(device->att, device->ltk->enc_size);
+
bt_gatt_server_set_debug(device->server, gatt_debug, NULL, NULL);

btd_gatt_database_server_connected(database, device->server);
@@ -6760,6 +7016,14 @@ struct btd_device *btd_device_ref(struct btd_device *device)
return device;
}

+static void remove_sirk_info(void *data, void *user_data)
+{
+ struct sirk_info *info = data;
+ struct btd_device *device = user_data;
+
+ btd_set_remove_device(info->set, device);
+}
+
void btd_device_unref(struct btd_device *device)
{
if (__sync_sub_and_fetch(&device->ref_count, 1))
@@ -6770,6 +7034,9 @@ void btd_device_unref(struct btd_device *device)
return;
}

+ if (!queue_isempty(device->sirks))
+ queue_foreach(device->sirks, remove_sirk_info, device);
+
DBG("Freeing device %s", device->path);

g_dbus_unregister_interface(dbus_conn, device->path, DEVICE_INTERFACE);
@@ -6928,3 +7195,9 @@ int8_t btd_device_get_volume(struct btd_device *device)
{
return device->volume;
}
+
+void btd_device_foreach_ad(struct btd_device *dev, bt_ad_func_t func,
+ void *data)
+{
+ bt_ad_foreach_data(dev->ad, func, data);
+}
diff --git a/src/device.h b/src/device.h
index 9e81fda9e948..96347ff229cc 100644
--- a/src/device.h
+++ b/src/device.h
@@ -128,8 +128,10 @@ void device_remove_connection(struct btd_device *device, uint8_t bdaddr_type,
bool *remove);
void device_request_disconnect(struct btd_device *device, DBusMessage *msg);
bool device_is_disconnecting(struct btd_device *device);
-void device_set_ltk_enc_size(struct btd_device *device, uint8_t enc_size);
-
+void device_set_ltk(struct btd_device *device, const uint8_t val[16],
+ bool central, uint8_t enc_size);
+bool btd_device_add_set(struct btd_device *device, bool encrypted,
+ uint8_t sirk[16], uint8_t size, uint8_t rank);
void device_store_svc_chng_ccc(struct btd_device *device, uint8_t bdaddr_type,
uint16_t value);
void device_load_svc_chng_ccc(struct btd_device *device, uint16_t *ccc_le,
@@ -188,3 +190,8 @@ void btd_device_cleanup(void);

void btd_device_set_volume(struct btd_device *dev, int8_t volume);
int8_t btd_device_get_volume(struct btd_device *dev);
+
+typedef void (*bt_device_ad_func_t)(void *data, void *user_data);
+
+void btd_device_foreach_ad(struct btd_device *dev, bt_device_ad_func_t func,
+ void *data);
diff --git a/src/set.c b/src/set.c
new file mode 100644
index 000000000000..5836a06b887a
--- /dev/null
+++ b/src/set.c
@@ -0,0 +1,371 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * BlueZ - Bluetooth protocol stack for Linux
+ *
+ * Copyright (C) 2023 Intel Corporation
+ *
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <errno.h>
+
+#include <glib.h>
+#include <dbus/dbus.h>
+
+#include "gdbus/gdbus.h"
+#include "src/shared/util.h"
+#include "src/shared/queue.h"
+#include "src/shared/ad.h"
+#include "src/shared/crypto.h"
+
+#include "log.h"
+#include "error.h"
+#include "adapter.h"
+#include "device.h"
+#include "dbus-common.h"
+#include "set.h"
+
+static struct queue *set_list;
+
+struct btd_device_set {
+ struct btd_adapter *adapter;
+ char *path;
+ uint8_t sirk[16];
+ uint8_t size;
+ bool auto_connect;
+ struct queue *devices;
+ struct btd_device *device;
+};
+
+static DBusMessage *set_disconnect(DBusConnection *conn, DBusMessage *msg,
+ void *user_data)
+{
+ /* TODO */
+ return NULL;
+}
+
+static DBusMessage *set_connect(DBusConnection *conn, DBusMessage *msg,
+ void *user_data)
+{
+ /* TODO */
+ return NULL;
+}
+
+static const GDBusMethodTable set_methods[] = {
+ { GDBUS_EXPERIMENTAL_ASYNC_METHOD("Disconnect", NULL, NULL,
+ set_disconnect) },
+ { GDBUS_EXPERIMENTAL_ASYNC_METHOD("Connect", NULL, NULL,
+ set_connect) },
+ {}
+};
+
+static gboolean get_adapter(const GDBusPropertyTable *property,
+ DBusMessageIter *iter, void *data)
+{
+ struct btd_device_set *set = data;
+ const char *path = adapter_get_path(set->adapter);
+
+ dbus_message_iter_append_basic(iter, DBUS_TYPE_OBJECT_PATH, &path);
+
+ return TRUE;
+}
+
+static gboolean get_auto_connect(const GDBusPropertyTable *property,
+ DBusMessageIter *iter, void *data)
+{
+ struct btd_device_set *set = data;
+
+ dbus_message_iter_append_basic(iter, DBUS_TYPE_BOOLEAN,
+ &set->auto_connect);
+
+ return TRUE;
+}
+
+static void set_auto_connect(const GDBusPropertyTable *property,
+ DBusMessageIter *iter,
+ GDBusPendingPropertySet id, void *data)
+{
+ struct btd_device_set *set = data;
+ dbus_bool_t b;
+
+ if (dbus_message_iter_get_arg_type(iter) != DBUS_TYPE_BOOLEAN) {
+ g_dbus_pending_property_error(id,
+ ERROR_INTERFACE ".InvalidArguments",
+ "Invalid arguments in method call");
+ return;
+ }
+
+ dbus_message_iter_get_basic(iter, &b);
+
+ set->auto_connect = b ? true : false;
+
+ g_dbus_pending_property_success(id);
+}
+
+static void append_device(void *data, void *user_data)
+{
+ struct btd_device *device = data;
+ const char *path = device_get_path(device);
+ DBusMessageIter *entry = user_data;
+
+ dbus_message_iter_append_basic(entry, DBUS_TYPE_OBJECT_PATH, &path);
+}
+
+static gboolean get_devices(const GDBusPropertyTable *property,
+ DBusMessageIter *iter, void *data)
+{
+ struct btd_device_set *set = data;
+ DBusMessageIter entry;
+
+ dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY,
+ DBUS_TYPE_OBJECT_PATH_AS_STRING,
+ &entry);
+
+ queue_foreach(set->devices, append_device, &entry);
+
+ dbus_message_iter_close_container(iter, &entry);
+
+ return TRUE;
+}
+
+static gboolean get_size(const GDBusPropertyTable *property,
+ DBusMessageIter *iter, void *data)
+{
+ struct btd_device_set *set = data;
+
+ dbus_message_iter_append_basic(iter, DBUS_TYPE_BYTE, &set->size);
+
+ return TRUE;
+}
+
+static const GDBusPropertyTable set_properties[] = {
+ { "Adapter", "o", get_adapter, NULL, NULL,
+ G_DBUS_PROPERTY_FLAG_EXPERIMENTAL },
+ { "AutoConnect", "b", get_auto_connect, set_auto_connect, NULL,
+ G_DBUS_PROPERTY_FLAG_EXPERIMENTAL },
+ { "Devices", "ao", get_devices, NULL, NULL,
+ G_DBUS_PROPERTY_FLAG_EXPERIMENTAL },
+ { "Size", "y", get_size, NULL, NULL,
+ G_DBUS_PROPERTY_FLAG_EXPERIMENTAL },
+ {}
+};
+
+static void set_free(void *data)
+{
+ struct btd_device_set *set = data;
+
+ queue_destroy(set->devices, NULL);
+ g_free(set->path);
+ free(set);
+}
+
+static struct btd_device_set *set_new(struct btd_device *device,
+ uint8_t sirk[16], uint8_t size)
+{
+ struct btd_device_set *set;
+
+ set = new0(struct btd_device_set, 1);
+ set->adapter = device_get_adapter(device);
+ memcpy(set->sirk, sirk, sizeof(set->sirk));
+ set->size = size;
+ set->auto_connect = true;
+ set->devices = queue_new();
+ queue_push_tail(set->devices, device);
+ set->path = g_strdup_printf("%s/set_%02x%02x%02x%02x%02x%02x%02x%02x"
+ "%02x%02x%02x%02x%02x%02x%02x%02x",
+ adapter_get_path(set->adapter),
+ sirk[15], sirk[14], sirk[13], sirk[12],
+ sirk[11], sirk[10], sirk[9], sirk[8],
+ sirk[7], sirk[6], sirk[5], sirk[4],
+ sirk[3], sirk[2], sirk[1], sirk[0]);
+
+ DBG("Creating set %s", set->path);
+
+ if (g_dbus_register_interface(btd_get_dbus_connection(),
+ set->path, BTD_DEVICE_SET_INTERFACE,
+ set_methods, NULL,
+ set_properties, set,
+ set_free) == FALSE) {
+ error("Unable to register set interface");
+ set_free(set);
+ return NULL;
+ }
+
+ return set;
+}
+
+static struct btd_device_set *set_find(struct btd_device *device,
+ uint8_t sirk[16])
+{
+ struct btd_adapter *adapter = device_get_adapter(device);
+ const struct queue_entry *entry;
+
+ for (entry = queue_get_entries(set_list); entry; entry = entry->next) {
+ struct btd_device_set *set = entry->data;
+
+ if (set->adapter != adapter)
+ continue;
+
+ if (!memcmp(set->sirk, sirk, sizeof(set->sirk)))
+ return set;
+ }
+
+ return NULL;
+}
+
+static void set_connect_next(struct btd_device_set *set)
+{
+ const struct queue_entry *entry;
+
+ for (entry = queue_get_entries(set->devices); entry;
+ entry = entry->next) {
+ struct btd_device *device = entry->data;
+
+ /* Only connect one at time(?) */
+ if (!device_connect_le(device))
+ return;
+ }
+}
+
+static void set_add(struct btd_device_set *set, struct btd_device *device)
+{
+ /* Check if device is already part of the set then skip to connect */
+ if (queue_find(set->devices, NULL, device))
+ goto done;
+
+ DBG("set %s device %s", set->path, device_get_path(device));
+
+ queue_push_tail(set->devices, device);
+ g_dbus_emit_property_changed(btd_get_dbus_connection(), set->path,
+ BTD_DEVICE_SET_INTERFACE, "Devices");
+
+done:
+ /* Check if set is marked to auto-connect */
+ if (btd_device_is_connected(device) && set->auto_connect)
+ set_connect_next(set);
+}
+
+static void foreach_rsi(void *data, void *user_data)
+{
+ struct bt_ad_data *ad = data;
+ struct btd_device_set *set = user_data;
+ struct bt_crypto *crypto;
+ uint8_t res[3];
+
+ if (ad->type != BT_AD_CSIP_RSI || ad->len < 6)
+ return;
+
+ crypto = bt_crypto_new();
+ if (!crypto)
+ return;
+
+ if (!bt_crypto_sih(crypto, set->sirk, ad->data + 3, res)) {
+ bt_crypto_unref(crypto);
+ return;
+ }
+
+ bt_crypto_unref(crypto);
+
+ if (!memcmp(ad->data, res, sizeof(res))) {
+ btd_device_set_temporary(set->device, false);
+ device_connect_le(set->device);
+ }
+}
+
+static void foreach_device(struct btd_device *device, void *data)
+{
+ struct btd_device_set *set = data;
+
+ /* Check if device is already part of the set then skip */
+ if (queue_find(set->devices, NULL, device))
+ return;
+
+ set->device = device;
+
+ btd_device_foreach_ad(device, foreach_rsi, set);
+}
+
+struct btd_device_set *btd_set_add_device(struct btd_device *device,
+ uint8_t *key, uint8_t sirk[16],
+ uint8_t size)
+{
+ struct btd_device_set *set;
+
+ /* In case key has been set it means SIRK is encrypted */
+ if (key) {
+ struct bt_crypto *crypto = bt_crypto_new();
+
+ if (!crypto)
+ return NULL;
+
+ /* sef and sdf are symmetric */
+ bt_crypto_sef(crypto, key, sirk, sirk);
+
+ bt_crypto_unref(crypto);
+ }
+
+ /* Check if DeviceSet already exists */
+ set = set_find(device, sirk);
+ if (set) {
+ set_add(set, device);
+ return set;
+ }
+
+ set = set_new(device, sirk, size);
+ if (!set)
+ return NULL;
+
+ if (!set_list)
+ set_list = queue_new();
+
+ queue_push_tail(set_list, set);
+
+ /* Attempt to add devices which have matching RSI */
+ btd_adapter_for_each_device(device_get_adapter(device), foreach_device,
+ set);
+
+ return set;
+}
+
+bool btd_set_remove_device(struct btd_device_set *set,
+ struct btd_device *device)
+{
+ if (!set || !device)
+ return false;
+
+ if (!queue_remove_if(set->devices, NULL, device))
+ return false;
+
+ if (!queue_isempty(set->devices)) {
+ g_dbus_emit_property_changed(btd_get_dbus_connection(),
+ set->path,
+ BTD_DEVICE_SET_INTERFACE,
+ "Devices");
+ return true;
+ }
+
+ if (!queue_remove(set_list, set))
+ return false;
+
+ /* Unregister if there are no devices left in the set */
+ g_dbus_unregister_interface(btd_get_dbus_connection(), set->path,
+ BTD_DEVICE_SET_INTERFACE);
+
+ return true;
+}
+
+const char *btd_set_get_path(struct btd_device_set *set)
+{
+ return set->path;
+}
diff --git a/src/set.h b/src/set.h
new file mode 100644
index 000000000000..67177e8c7946
--- /dev/null
+++ b/src/set.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ *
+ * BlueZ - Bluetooth protocol stack for Linux
+ *
+ * Copyright (C) 2023 Intel Corporation
+ *
+ *
+ */
+
+#define BTD_DEVICE_SET_INTERFACE "org.bluez.DeviceSet1"
+
+struct btd_device_set;
+
+struct btd_device_set *btd_set_add_device(struct btd_device *device,
+ uint8_t *ltk, uint8_t sirk[16],
+ uint8_t size);
+bool btd_set_remove_device(struct btd_device_set *set,
+ struct btd_device *device);
+const char *btd_set_get_path(struct btd_device_set *set);
--
2.39.2