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Bluetooth: host: cfg_write callback to return error code

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Current implementation of application's cfg_write callback only has the
possibility of returning boolean status, which in case of failure only
allows for one error code; BT_ATT_ERR_WRITE_NOT_PERMITTED.
This change makes the application able to add own security check on
characteristic subscription in the cfg_write callback and report a more
relevant error code (e.g. BT_ATT_ERR_AUTHORIZATION).

Signed-off-by: Kim Sekkelund <ksek@oticon.com>
This commit is contained in:
Kim Sekkelund 2019-11-26 08:22:21 +01:00 • committed by Johan Hedberg
commit 9ea6e72bae
3 changed files with 58 additions and 22 deletions
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46
include/bluetooth/gatt.h
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@ -571,15 +571,43 @@ struct bt_gatt_ccc_cfg {
/* Internal representation of CCC value */
struct _bt_gatt_ccc {
struct bt_gatt_ccc_cfg cfg[BT_GATT_CCC_MAX];
u16_t value;
void (*cfg_changed)(const struct bt_gatt_attr *attr,
u16_t value);
bool (*cfg_write)(struct bt_conn *conn,
const struct bt_gatt_attr *attr,
u16_t value);
bool (*cfg_match)(struct bt_conn *conn,
const struct bt_gatt_attr *attr);
/** Configuration for each connection */
struct bt_gatt_ccc_cfg cfg[BT_GATT_CCC_MAX];
/** Highest value of all connected peer's subscriptions */
u16_t value;
/** CCC attribute changed callback
*
* @param attr The attribute that's changed value
* @param value New value
*/
void (*cfg_changed)(const struct bt_gatt_attr *attr, u16_t value);
/** CCC attribute write validation callback
*
* @param conn The connection that is requesting to write
* @param attr The attribute that's being written
* @param value CCC value to write
*
* @return Number of bytes to write, or in case of an error
* BT_GATT_ERR() with a specific error code.
*/
ssize_t (*cfg_write)(struct bt_conn *conn,
const struct bt_gatt_attr *attr, u16_t value);
/** CCC attribute match handler
* Indicate if it is OK to send a notification or indication
* to the subscriber.
*
* @param conn The connection that is being checked
* @param attr The attribute that's being checked
*
* @return true if application has approved notification/indication,
* false if application does not approve.
*/
bool (*cfg_match)(struct bt_conn *conn,
const struct bt_gatt_attr *attr);
};
/** @brief Read Client Characteristic Configuration Attribute helper.