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bluetooth: host: Introduce a config option for Service Changed

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The Service Changed characteristic support should also work when the
GATT database has been modified after reboot (firmware update scenario)

This commit introduces a BT_GATT_SERVICE_CHANGED config option that is
independent from BT_GATT_CACHING and BT_GATT_DYNAMIC_DB.

Signed-off-by: François Delawarde <fnde@oticon.com>
This commit is contained in:
François Delawarde 2019-10-04 13:48:07 +02:00 • committed by Carles Cufí
commit 3a2d269bb4
2 changed files with 78 additions and 48 deletions
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9
subsys/bluetooth/host/Kconfig.gatt
View file

@ -37,16 +37,23 @@ config BT_ATT_TX_MAX
amount the calls will block until an existing queued PDU gets
sent.
config BT_GATT_SERVICE_CHANGED
bool "GATT Service Changed support"
default y
help
This option enables support for the service changed characteristic.
config BT_GATT_DYNAMIC_DB
bool "GATT dynamic database support"
default n
depends on BT_GATT_SERVICE_CHANGED
help
This option enables registering/unregistering services at runtime.
config BT_GATT_CACHING
bool "GATT Caching support"
default y
depends on BT_GATT_DYNAMIC_DB
depends on BT_GATT_SERVICE_CHANGED
select TINYCRYPT
select TINYCRYPT_AES
select TINYCRYPT_AES_CMAC

109
subsys/bluetooth/host/gatt.c
View file

@ -17,13 +17,13 @@
#include <settings/settings.h>
#if defined(CONFIG_BT_GATT_DYNAMIC_DB)
#if defined(CONFIG_BT_GATT_CACHING)
#include <tinycrypt/constants.h>
#include <tinycrypt/utils.h>
#include <tinycrypt/aes.h>
#include <tinycrypt/cmac_mode.h>
#include <tinycrypt/ccm_mode.h>
#endif /* CONFIG_BT_GATT_DYNAMIC_DB */
#endif /* CONFIG_BT_GATT_CACHING */
#include <bluetooth/hci.h>
#include <bluetooth/bluetooth.h>
@ -64,7 +64,10 @@ static sys_slist_t subscriptions;
static const u16_t gap_appearance = CONFIG_BT_DEVICE_APPEARANCE;
#if defined(CONFIG_BT_GATT_DYNAMIC_DB)
static sys_slist_t db;
#endif /* CONFIG_BT_GATT_DYNAMIC_DB */
static atomic_t init;
static ssize_t read_name(struct bt_conn *conn, const struct bt_gatt_attr *attr,
@ -180,13 +183,15 @@ BT_GATT_SERVICE_DEFINE(_2_gap_svc,
#endif
);
#if defined(CONFIG_BT_GATT_DYNAMIC_DB)
#if defined(CONFIG_BT_GATT_SERVICE_CHANGED)
static void sc_ccc_cfg_changed(const struct bt_gatt_attr *attr,
u16_t value)
{
BT_DBG("value 0x%04x", value);
}
#endif /* CONFIG_BT_GATT_SERVICE_CHANGED */
#if defined(CONFIG_BT_GATT_CACHING)
enum {
CF_CHANGE_AWARE, /* Client is changed aware */
CF_OUT_OF_SYNC, /* Client is out of sync */
@ -204,7 +209,6 @@ struct gatt_cf_cfg {
ATOMIC_DEFINE(flags, CF_NUM_FLAGS);
};
#if defined(CONFIG_BT_GATT_CACHING)
#define CF_CFG_MAX (CONFIG_BT_MAX_PAIRED + CONFIG_BT_MAX_CONN)
static struct gatt_cf_cfg cf_cfg[CF_CFG_MAX] = {};
@ -493,11 +497,10 @@ static void remove_cf_cfg(struct bt_conn *conn)
}
}
#endif /* CONFIG_BT_GATT_CACHING */
#endif /* CONFIG_BT_GATT_DYNAMIC_DB */
BT_GATT_SERVICE_DEFINE(_1_gatt_svc,
BT_GATT_PRIMARY_SERVICE(BT_UUID_GATT),
#if defined(CONFIG_BT_GATT_DYNAMIC_DB)
#if defined(CONFIG_BT_GATT_SERVICE_CHANGED)
/* Bluetooth 5.0, Vol3 Part G:
* The Service Changed characteristic Attribute Handle on the server
* shall not change if the server has a trusted relationship with any
@ -515,11 +518,10 @@ BT_GATT_SERVICE_DEFINE(_1_gatt_svc,
BT_GATT_CHRC_READ, BT_GATT_PERM_READ,
db_hash_read, NULL, NULL),
#endif /* CONFIG_BT_GATT_CACHING */
#endif /* CONFIG_BT_GATT_DYNAMIC_DB */
#endif /* CONFIG_BT_GATT_SERVICE_CHANGED */
);
#if defined(CONFIG_BT_GATT_DYNAMIC_DB)
static u8_t found_attr(const struct bt_gatt_attr *attr, void *user_data)
{
const struct bt_gatt_attr **found = user_data;
@ -604,7 +606,9 @@ populate:
return 0;
}
#endif /* CONFIG_BT_GATT_DYNAMIC_DB */
#if defined(CONFIG_BT_GATT_SERVICE_CHANGED)
enum {
SC_RANGE_CHANGED, /* SC range changed */
SC_INDICATE_PENDING, /* SC indicate pending */
@ -681,7 +685,7 @@ static void sc_process(struct k_work *work)
atomic_set_bit(sc->flags, SC_INDICATE_PENDING);
}
#endif /* CONFIG_BT_GATT_DYNAMIC_DB */
#endif /* CONFIG_BT_GATT_SERVICE_CHANGED */
#if defined(CONFIG_BT_SETTINGS_CCC_STORE_ON_WRITE)
static struct gatt_ccc_store {
@ -754,15 +758,15 @@ void bt_gatt_init(void)
*/
k_delayed_work_submit(&db_hash_work, DB_HASH_TIMEOUT);
#endif /* CONFIG_BT_GATT_CACHING */
#if defined(CONFIG_BT_GATT_DYNAMIC_DB)
#if defined(CONFIG_BT_GATT_SERVICE_CHANGED)
k_delayed_work_init(&gatt_sc.work, sc_process);
#endif /* CONFIG_BT_GATT_DYNAMIC_DB */
#endif /* CONFIG_BT_GATT_SERVICE_CHANGED */
#if defined(CONFIG_BT_SETTINGS_CCC_STORE_ON_WRITE)
k_delayed_work_init(&gatt_ccc_store.work, ccc_delayed_store);
#endif
}
#if defined(CONFIG_BT_GATT_DYNAMIC_DB)
#if defined(CONFIG_BT_GATT_SERVICE_CHANGED)
static bool update_range(u16_t *start, u16_t *end, u16_t new_start,
u16_t new_end)
{
@ -807,7 +811,9 @@ submit:
/* Reschedule since the range has changed */
k_delayed_work_submit(&sc->work, SC_TIMEOUT);
}
#endif /* CONFIG_BT_GATT_SERVICE_CHANGED */
#if defined(CONFIG_BT_GATT_DYNAMIC_DB)
static void db_changed(void)
{
#if defined(CONFIG_BT_GATT_CACHING)
@ -1087,12 +1093,48 @@ static u8_t gatt_foreach_iter(const struct bt_gatt_attr *attr,
return result;
}
static void foreach_attr_type_dyndb(u16_t start_handle, u16_t end_handle,
const struct bt_uuid *uuid,
const void *attr_data, uint16_t num_matches,
bt_gatt_attr_func_t func, void *user_data)
{
#if defined(CONFIG_BT_GATT_DYNAMIC_DB)
int i;
struct bt_gatt_service *svc;
SYS_SLIST_FOR_EACH_CONTAINER(&db, svc, node) {
struct bt_gatt_service *next;
next = SYS_SLIST_PEEK_NEXT_CONTAINER(svc, node);
if (next) {
/* Skip ahead if start is not within service handles */
if (next->attrs[0].handle <= start_handle) {
continue;
}
}
for (i = 0; i < svc->attr_count; i++) {
struct bt_gatt_attr *attr = &svc->attrs[i];
if (gatt_foreach_iter(attr,
start_handle,
end_handle,
uuid, attr_data,
&num_matches,
func, user_data) ==
BT_GATT_ITER_STOP) {
return;
}
}
}
#endif /* CONFIG_BT_GATT_DYNAMIC_DB */
}
void bt_gatt_foreach_attr_type(u16_t start_handle, u16_t end_handle,
const struct bt_uuid *uuid,
const void *attr_data, uint16_t num_matches,
bt_gatt_attr_func_t func, void *user_data)
{
struct bt_gatt_service *svc;
int i;
if (!num_matches) {
@ -1128,28 +1170,9 @@ void bt_gatt_foreach_attr_type(u16_t start_handle, u16_t end_handle,
}
}
SYS_SLIST_FOR_EACH_CONTAINER(&db, svc, node) {
struct bt_gatt_service *next;
next = SYS_SLIST_PEEK_NEXT_CONTAINER(svc, node);
if (next) {
/* Skip ahead if start is not within service handles */
if (next->attrs[0].handle <= start_handle) {
continue;
}
}
for (i = 0; i < svc->attr_count; i++) {
struct bt_gatt_attr *attr = &svc->attrs[i];
if (gatt_foreach_iter(attr, start_handle, end_handle,
uuid, attr_data, &num_matches,
func, user_data) ==
BT_GATT_ITER_STOP) {
return;
}
}
}
/* Iterate over dynamic db */
foreach_attr_type_dyndb(start_handle, end_handle, uuid, attr_data,
num_matches, func, user_data);
}
static u8_t find_next(const struct bt_gatt_attr *attr, void *user_data)
@ -1464,7 +1487,7 @@ static int gatt_indicate(struct bt_conn *conn, u16_t handle,
return gatt_send(conn, buf, gatt_indicate_rsp, params, NULL);
}
#if defined(CONFIG_BT_GATT_DYNAMIC_DB)
#if defined(CONFIG_BT_GATT_SERVICE_CHANGED)
struct sc_data {
u16_t start;
u16_t end;
@ -1497,7 +1520,7 @@ done:
BT_DBG("peer %s start 0x%04x end 0x%04x", bt_addr_le_str(&cfg->peer),
stored->start, stored->end);
}
#endif /* CONFIG_BT_GATT_DYNAMIC_DB */
#endif /* CONFIG_BT_GATT_SERVICE_CHANGED */
static u8_t notify_cb(const struct bt_gatt_attr *attr, void *user_data)
{
@ -1527,11 +1550,11 @@ static u8_t notify_cb(const struct bt_gatt_attr *attr, void *user_data)
conn = bt_conn_lookup_addr_le(cfg->id, &cfg->peer);
if (!conn) {
#if defined(CONFIG_BT_GATT_DYNAMIC_DB)
if (IS_ENABLED(CONFIG_BT_GATT_SERVICE_CHANGED)) {
if (ccc->cfg_changed == sc_ccc_cfg_changed) {
sc_save(cfg, data->ind_params);
}
#endif /* CONFIG_BT_GATT_DYNAMIC_DB */
}
continue;
}
@ -1740,7 +1763,7 @@ u8_t bt_gatt_check_perm(struct bt_conn *conn, const struct bt_gatt_attr *attr,
return 0;
}
#if defined(CONFIG_BT_GATT_DYNAMIC_DB)
#if defined(CONFIG_BT_GATT_SERVICE_CHANGED)
static void sc_restore(struct bt_gatt_ccc_cfg *cfg)
{
struct sc_data *data = (struct sc_data *)cfg->data;
@ -1757,7 +1780,7 @@ static void sc_restore(struct bt_gatt_ccc_cfg *cfg)
/* Reset config data */
(void)memset(cfg->data, 0, sizeof(cfg->data));
}
#endif /* CONFIG_BT_GATT_DYNAMIC_DB */
#endif /* CONFIG_BT_GATT_SERVICE_CHANGED */
struct conn_data {
struct bt_conn *conn;
@ -1813,11 +1836,11 @@ static u8_t update_ccc(const struct bt_gatt_attr *attr, void *user_data)
if (ccc->cfg[i].value) {
gatt_ccc_changed(attr, ccc);
#if defined(CONFIG_BT_GATT_DYNAMIC_DB)
if (IS_ENABLED(CONFIG_BT_GATT_SERVICE_CHANGED)) {
if (ccc->cfg_changed == sc_ccc_cfg_changed) {
sc_restore(&ccc->cfg[i]);
}
#endif /* CONFIG_BT_GATT_DYNAMIC_DB */
}
return BT_GATT_ITER_CONTINUE;
}
}