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Bluetooth: Defer connection-parameter removal when unpairing

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Systematically removing the LE connection parameters and autoconnect
action is inconvenient for rebonding without disconnecting from
userland (i.e. unpairing followed by repairing without
disconnecting). The parameters will be lost after unparing and
userland needs to take care of book-keeping them and re-adding them.

This patch allows userland to forget about parameter management when
rebonding without disconnecting. It defers clearing the connection
parameters when unparing without disconnecting, giving a chance of
keeping the parameters if a repairing happens before the connection is
closed.

Signed-off-by: Alfonso Acosta <fons@spotify.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Alfonso Acosta 2014-10-11 21:44:47 +00:00 committed by Marcel Holtmann
parent c37a8106de
commit 89cbb0638e
3 changed files with 42 additions and 13 deletions
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1
include/net/bluetooth/hci_core.h
View File

@ -555,6 +555,7 @@ enum {
HCI_CONN_STK_ENCRYPT,
HCI_CONN_AUTH_INITIATOR,
HCI_CONN_DROP,
HCI_CONN_PARAM_REMOVAL_PEND,
};
static inline bool hci_conn_ssp_enabled(struct hci_conn *conn)

3
net/bluetooth/hci_conn.c
View File

@ -544,6 +544,9 @@ int hci_conn_del(struct hci_conn *conn)
hci_conn_del_sysfs(conn);
if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
hci_dev_put(hdev);
hci_conn_put(conn);

51
net/bluetooth/mgmt.c
View File

@ -2725,10 +2725,40 @@ static int unpair_device(struct sock *sk, struct hci_dev *hdev, void *data,
}
if (cp->addr.type == BDADDR_BREDR) {
/* If disconnection is requested, then look up the
* connection. If the remote device is connected, it
* will be later used to terminate the link.
*
* Setting it to NULL explicitly will cause no
* termination of the link.
*/
if (cp->disconnect)
conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK,
&cp->addr.bdaddr);
else
conn = NULL;
err = hci_remove_link_key(hdev, &cp->addr.bdaddr);
} else {
u8 addr_type;
conn = hci_conn_hash_lookup_ba(hdev, LE_LINK,
&cp->addr.bdaddr);
if (conn) {
/* Defer clearing up the connection parameters
* until closing to give a chance of keeping
* them if a repairing happens.
*/
set_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags);
/* If disconnection is not requested, then
* clear the connection variable so that the
* link is not terminated.
*/
if (!cp->disconnect)
conn = NULL;
}
if (cp->addr.type == BDADDR_LE_PUBLIC)
addr_type = ADDR_LE_DEV_PUBLIC;
else
@ -2736,8 +2766,6 @@ static int unpair_device(struct sock *sk, struct hci_dev *hdev, void *data,
hci_remove_irk(hdev, &cp->addr.bdaddr, addr_type);
hci_conn_params_del(hdev, &cp->addr.bdaddr, addr_type);
err = hci_remove_ltk(hdev, &cp->addr.bdaddr, addr_type);
}
@ -2747,17 +2775,9 @@ static int unpair_device(struct sock *sk, struct hci_dev *hdev, void *data,
goto unlock;
}
if (cp->disconnect) {
if (cp->addr.type == BDADDR_BREDR)
conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK,
&cp->addr.bdaddr);
else
conn = hci_conn_hash_lookup_ba(hdev, LE_LINK,
&cp->addr.bdaddr);
} else {
conn = NULL;
}
/* If the connection variable is set, then termination of the
* link is requested.
*/
if (!conn) {
err = cmd_complete(sk, hdev->id, MGMT_OP_UNPAIR_DEVICE, 0,
&rp, sizeof(rp));
@ -3062,6 +3082,11 @@ static void pairing_complete(struct pending_cmd *cmd, u8 status)
hci_conn_put(conn);
mgmt_pending_remove(cmd);
/* The device is paired so there is no need to remove
* its connection parameters anymore.
*/
clear_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags);
}
void mgmt_smp_complete(struct hci_conn *conn, bool complete)