Bluetooth: Add SMP-internal timeout callback

This patch adds an SMP-internal timeout callback to remove the depenency
on (the soon to be removed) l2cap_conn->security_timer. The behavior is
the same as with l2cap_conn->security_timer except that the new
l2cap_conn_shutdown() public function is used instead of the L2CAP core
internal l2cap_conn_del().

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index 5103dc7..7ab5f52 100644 (file)
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -44,7 +44,9 @@ enum {
 };
 
 struct smp_chan {
-       struct l2cap_conn *conn;
+       struct l2cap_conn       *conn;
+       struct delayed_work     security_timer;
+
        u8              preq[7]; /* SMP Pairing Request */
        u8              prsp[7]; /* SMP Pairing Response */
        u8              prnd[16]; /* SMP Pairing Random (local) */
@@ -251,6 +253,7 @@ static int smp_s1(struct smp_chan *smp, u8 k[16], u8 r1[16], u8 r2[16],
 static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data)
 {
        struct l2cap_chan *chan = conn->smp;
+       struct smp_chan *smp;
        struct kvec iv[2];
        struct msghdr msg;
 
@@ -272,8 +275,14 @@ static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data)
 
        l2cap_chan_send(chan, &msg, 1 + len);
 
-       cancel_delayed_work_sync(&conn->security_timer);
-       schedule_delayed_work(&conn->security_timer, SMP_TIMEOUT);
+       if (!chan->data)
+               return;
+
+       smp = chan->data;
+
+       cancel_delayed_work_sync(&smp->security_timer);
+       if (test_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags))
+               schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT);
 }
 
 static __u8 authreq_to_seclevel(__u8 authreq)
@@ -359,6 +368,8 @@ static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size)
 static void smp_failure(struct l2cap_conn *conn, u8 reason)
 {
        struct hci_conn *hcon = conn->hcon;
+       struct l2cap_chan *chan = conn->smp;
+       struct smp_chan *smp;
 
        if (reason)
                smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason),
@@ -368,7 +379,12 @@ static void smp_failure(struct l2cap_conn *conn, u8 reason)
        mgmt_auth_failed(hcon->hdev, &hcon->dst, hcon->type, hcon->dst_type,
                         HCI_ERROR_AUTH_FAILURE);
 
-       cancel_delayed_work_sync(&conn->security_timer);
+       if (!chan->data)
+               return;
+
+       smp = chan->data;
+
+       cancel_delayed_work_sync(&smp->security_timer);
 
        if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags))
                smp_chan_destroy(conn);
@@ -749,7 +765,7 @@ static int smp_distribute_keys(struct l2cap_conn *conn)
                return 0;
 
        clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags);
-       cancel_delayed_work_sync(&conn->security_timer);
+       cancel_delayed_work_sync(&smp->security_timer);
        set_bit(SMP_FLAG_COMPLETE, &smp->flags);
        smp_notify_keys(conn);
 
@@ -758,6 +774,17 @@ static int smp_distribute_keys(struct l2cap_conn *conn)
        return 0;
 }
 
+static void smp_timeout(struct work_struct *work)
+{
+       struct smp_chan *smp = container_of(work, struct smp_chan,
+                                           security_timer.work);
+       struct l2cap_conn *conn = smp->conn;
+
+       BT_DBG("conn %p", conn);
+
+       l2cap_conn_shutdown(conn, ETIMEDOUT);
+}
+
 static struct smp_chan *smp_chan_create(struct l2cap_conn *conn)
 {
        struct l2cap_chan *chan = conn->smp;
@@ -780,6 +807,8 @@ static struct smp_chan *smp_chan_create(struct l2cap_conn *conn)
        smp->conn = conn;
        chan->data = smp;
 
+       INIT_DELAYED_WORK(&smp->security_timer, smp_timeout);
+
        hci_conn_hold(conn->hcon);
 
        return smp;
@@ -1479,11 +1508,12 @@ done:
 static void smp_teardown_cb(struct l2cap_chan *chan, int err)
 {
        struct l2cap_conn *conn = chan->conn;
+       struct smp_chan *smp = chan->data;
 
        BT_DBG("chan %p", chan);
 
        if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) {
-               cancel_delayed_work_sync(&conn->security_timer);
+               cancel_delayed_work_sync(&smp->security_timer);
                smp_chan_destroy(conn);
        }
 
@@ -1493,6 +1523,7 @@ static void smp_teardown_cb(struct l2cap_chan *chan, int err)
 
 static void smp_resume_cb(struct l2cap_chan *chan)
 {
+       struct smp_chan *smp = chan->data;
        struct l2cap_conn *conn = chan->conn;
        struct hci_conn *hcon = conn->hcon;
 
@@ -1500,7 +1531,9 @@ static void smp_resume_cb(struct l2cap_chan *chan)
 
        if (test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
                smp_distribute_keys(conn);
-       cancel_delayed_work(&conn->security_timer);
+
+       if (smp)
+               cancel_delayed_work(&smp->security_timer);
 }
 
 static void smp_ready_cb(struct l2cap_chan *chan)
@@ -1521,9 +1554,10 @@ static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
 
        err = smp_sig_channel(chan, skb);
        if (err) {
-               struct l2cap_conn *conn = chan->conn;
+               struct smp_chan *smp = chan->data;
 
-               cancel_delayed_work_sync(&conn->security_timer);
+               if (smp)
+                       cancel_delayed_work_sync(&smp->security_timer);
 
                l2cap_conn_shutdown(chan->conn, -err);
        }