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path: root/kernel/net/bluetooth/l2cap_sock.c
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Diffstat (limited to 'kernel/net/bluetooth/l2cap_sock.c')
-rw-r--r--kernel/net/bluetooth/l2cap_sock.c104
1 files changed, 76 insertions, 28 deletions
diff --git a/kernel/net/bluetooth/l2cap_sock.c b/kernel/net/bluetooth/l2cap_sock.c
index a7278f05e..1bb551527 100644
--- a/kernel/net/bluetooth/l2cap_sock.c
+++ b/kernel/net/bluetooth/l2cap_sock.c
@@ -43,7 +43,7 @@ static struct bt_sock_list l2cap_sk_list = {
static const struct proto_ops l2cap_sock_ops;
static void l2cap_sock_init(struct sock *sk, struct sock *parent);
static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
- int proto, gfp_t prio);
+ int proto, gfp_t prio, int kern);
bool l2cap_is_socket(struct socket *sock)
{
@@ -1054,18 +1054,23 @@ static void l2cap_sock_kill(struct sock *sk)
sock_put(sk);
}
-static int __l2cap_wait_ack(struct sock *sk)
+static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan)
{
- struct l2cap_chan *chan = l2cap_pi(sk)->chan;
DECLARE_WAITQUEUE(wait, current);
int err = 0;
- int timeo = HZ/5;
+ int timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
+ /* Timeout to prevent infinite loop */
+ unsigned long timeout = jiffies + L2CAP_WAIT_ACK_TIMEOUT;
add_wait_queue(sk_sleep(sk), &wait);
set_current_state(TASK_INTERRUPTIBLE);
- while (chan->unacked_frames > 0 && chan->conn) {
+ do {
+ BT_DBG("Waiting for %d ACKs, timeout %04d ms",
+ chan->unacked_frames, time_after(jiffies, timeout) ? 0 :
+ jiffies_to_msecs(timeout - jiffies));
+
if (!timeo)
- timeo = HZ/5;
+ timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
if (signal_pending(current)) {
err = sock_intr_errno(timeo);
@@ -1080,7 +1085,15 @@ static int __l2cap_wait_ack(struct sock *sk)
err = sock_error(sk);
if (err)
break;
- }
+
+ if (time_after(jiffies, timeout)) {
+ err = -ENOLINK;
+ break;
+ }
+
+ } while (chan->unacked_frames > 0 &&
+ chan->state == BT_CONNECTED);
+
set_current_state(TASK_RUNNING);
remove_wait_queue(sk_sleep(sk), &wait);
return err;
@@ -1098,41 +1111,76 @@ static int l2cap_sock_shutdown(struct socket *sock, int how)
if (!sk)
return 0;
+ lock_sock(sk);
+
+ if (sk->sk_shutdown)
+ goto shutdown_already;
+
+ BT_DBG("Handling sock shutdown");
+
+ /* prevent sk structure from being freed whilst unlocked */
+ sock_hold(sk);
+
chan = l2cap_pi(sk)->chan;
- conn = chan->conn;
+ /* prevent chan structure from being freed whilst unlocked */
+ l2cap_chan_hold(chan);
BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
+ if (chan->mode == L2CAP_MODE_ERTM &&
+ chan->unacked_frames > 0 &&
+ chan->state == BT_CONNECTED) {
+ err = __l2cap_wait_ack(sk, chan);
+
+ /* After waiting for ACKs, check whether shutdown
+ * has already been actioned to close the L2CAP
+ * link such as by l2cap_disconnection_req().
+ */
+ if (sk->sk_shutdown)
+ goto has_shutdown;
+ }
+
+ sk->sk_shutdown = SHUTDOWN_MASK;
+ release_sock(sk);
+
+ l2cap_chan_lock(chan);
+ conn = chan->conn;
+ if (conn)
+ /* prevent conn structure from being freed */
+ l2cap_conn_get(conn);
+ l2cap_chan_unlock(chan);
+
if (conn)
+ /* mutex lock must be taken before l2cap_chan_lock() */
mutex_lock(&conn->chan_lock);
l2cap_chan_lock(chan);
- lock_sock(sk);
+ l2cap_chan_close(chan, 0);
+ l2cap_chan_unlock(chan);
- if (!sk->sk_shutdown) {
- if (chan->mode == L2CAP_MODE_ERTM)
- err = __l2cap_wait_ack(sk);
+ if (conn) {
+ mutex_unlock(&conn->chan_lock);
+ l2cap_conn_put(conn);
+ }
- sk->sk_shutdown = SHUTDOWN_MASK;
+ lock_sock(sk);
- release_sock(sk);
- l2cap_chan_close(chan, 0);
- lock_sock(sk);
+ if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
+ !(current->flags & PF_EXITING))
+ err = bt_sock_wait_state(sk, BT_CLOSED,
+ sk->sk_lingertime);
- if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
- !(current->flags & PF_EXITING))
- err = bt_sock_wait_state(sk, BT_CLOSED,
- sk->sk_lingertime);
- }
+has_shutdown:
+ l2cap_chan_put(chan);
+ sock_put(sk);
+shutdown_already:
if (!err && sk->sk_err)
err = -sk->sk_err;
release_sock(sk);
- l2cap_chan_unlock(chan);
- if (conn)
- mutex_unlock(&conn->chan_lock);
+ BT_DBG("Sock shutdown complete err: %d", err);
return err;
}
@@ -1193,7 +1241,7 @@ static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan)
}
sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
- GFP_ATOMIC);
+ GFP_ATOMIC, 0);
if (!sk) {
release_sock(parent);
return NULL;
@@ -1523,12 +1571,12 @@ static struct proto l2cap_proto = {
};
static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
- int proto, gfp_t prio)
+ int proto, gfp_t prio, int kern)
{
struct sock *sk;
struct l2cap_chan *chan;
- sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
+ sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto, kern);
if (!sk)
return NULL;
@@ -1574,7 +1622,7 @@ static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
sock->ops = &l2cap_sock_ops;
- sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
+ sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
if (!sk)
return -ENOMEM;