From 8731840a345fb7ebfd0174ecc29aa21623bc2899 Mon Sep 17 00:00:00 2001 From: Abhishek Pandit-Subedi Date: Thu, 19 Mar 2020 17:07:12 -0700 Subject: Bluetooth: Restore running state if suspend fails If Bluetooth fails to enter the suspended state correctly, restore the state to running (re-enabling scans). PM_POST_SUSPEND is only sent to notifiers that successfully return from PM_PREPARE_SUSPEND notification so we should recover gracefully if it fails. Signed-off-by: Abhishek Pandit-Subedi Signed-off-by: Marcel Holtmann --- net/bluetooth/hci_core.c | 39 ++++++++++++++++++++------------------- 1 file changed, 20 insertions(+), 19 deletions(-) (limited to 'net') diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index dbd2ad3a26ed..2e7bc2da8371 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -3305,6 +3305,15 @@ static void hci_prepare_suspend(struct work_struct *work) hci_dev_unlock(hdev); } +static int hci_change_suspend_state(struct hci_dev *hdev, + enum suspended_state next) +{ + hdev->suspend_state_next = next; + set_bit(SUSPEND_PREPARE_NOTIFIER, hdev->suspend_tasks); + queue_work(hdev->req_workqueue, &hdev->suspend_prepare); + return hci_suspend_wait_event(hdev); +} + static int hci_suspend_notifier(struct notifier_block *nb, unsigned long action, void *data) { @@ -3330,32 +3339,24 @@ static int hci_suspend_notifier(struct notifier_block *nb, unsigned long action, * connectable (disabling scanning) * - Second, program event filter/whitelist and enable scan */ - hdev->suspend_state_next = BT_SUSPEND_DISCONNECT; - set_bit(SUSPEND_PREPARE_NOTIFIER, hdev->suspend_tasks); - queue_work(hdev->req_workqueue, &hdev->suspend_prepare); - ret = hci_suspend_wait_event(hdev); + ret = hci_change_suspend_state(hdev, BT_SUSPEND_DISCONNECT); - /* If the disconnect portion failed, don't attempt to complete - * by configuring the whitelist. The suspend notifier will - * follow a cancelled suspend with a PM_POST_SUSPEND - * notification. - */ - if (!ret) { - hdev->suspend_state_next = BT_SUSPEND_COMPLETE; - set_bit(SUSPEND_PREPARE_NOTIFIER, hdev->suspend_tasks); - queue_work(hdev->req_workqueue, &hdev->suspend_prepare); - ret = hci_suspend_wait_event(hdev); - } + /* Only configure whitelist if disconnect succeeded */ + if (!ret) + ret = hci_change_suspend_state(hdev, + BT_SUSPEND_COMPLETE); } else if (action == PM_POST_SUSPEND) { - hdev->suspend_state_next = BT_RUNNING; - set_bit(SUSPEND_PREPARE_NOTIFIER, hdev->suspend_tasks); - queue_work(hdev->req_workqueue, &hdev->suspend_prepare); - ret = hci_suspend_wait_event(hdev); + ret = hci_change_suspend_state(hdev, BT_RUNNING); } + /* If suspend failed, restore it to running */ + if (ret && action == PM_SUSPEND_PREPARE) + hci_change_suspend_state(hdev, BT_RUNNING); + done: return ret ? notifier_from_errno(-EBUSY) : NOTIFY_STOP; } + /* Alloc HCI device */ struct hci_dev *hci_alloc_dev(void) { -- cgit v1.2.3 From 2d186fcd6d8d3a493894de48611e4925ddf7b951 Mon Sep 17 00:00:00 2001 From: Abhishek Pandit-Subedi Date: Thu, 19 Mar 2020 17:07:13 -0700 Subject: Bluetooth: Fix incorrect branch in connection complete When handling auto-connected devices, we should execute the rest of the connection complete when it was previously discovered and it is an ACL connection. Signed-off-by: Abhishek Pandit-Subedi Signed-off-by: Marcel Holtmann --- net/bluetooth/hci_event.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) (limited to 'net') diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index 20408d386268..cd3d7d90029b 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -2539,16 +2539,17 @@ static void hci_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb) bt_dev_err(hdev, "no memory for new conn"); goto unlock; } - } - - if (ev->link_type != SCO_LINK) - goto unlock; + } else { + if (ev->link_type != SCO_LINK) + goto unlock; - conn = hci_conn_hash_lookup_ba(hdev, ESCO_LINK, &ev->bdaddr); - if (!conn) - goto unlock; + conn = hci_conn_hash_lookup_ba(hdev, ESCO_LINK, + &ev->bdaddr); + if (!conn) + goto unlock; - conn->type = SCO_LINK; + conn->type = SCO_LINK; + } } if (!ev->status) { -- cgit v1.2.3 From b48596d1dc257900b9639f61e1cfd95250e7381b Mon Sep 17 00:00:00 2001 From: Luiz Augusto von Dentz Date: Mon, 23 Mar 2020 13:34:56 -0700 Subject: Bluetooth: L2CAP: Add get_peer_pid callback This adds a callback to read the socket pid. Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Marcel Holtmann --- net/bluetooth/l2cap_sock.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'net') diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c index 40fb10b591bd..117ba20ea194 100644 --- a/net/bluetooth/l2cap_sock.c +++ b/net/bluetooth/l2cap_sock.c @@ -1504,6 +1504,13 @@ static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan) return sk->sk_sndtimeo; } +static struct pid *l2cap_sock_get_peer_pid_cb(struct l2cap_chan *chan) +{ + struct sock *sk = chan->data; + + return sk->sk_peer_pid; +} + static void l2cap_sock_suspend_cb(struct l2cap_chan *chan) { struct sock *sk = chan->data; @@ -1525,6 +1532,7 @@ static const struct l2cap_ops l2cap_chan_ops = { .suspend = l2cap_sock_suspend_cb, .set_shutdown = l2cap_sock_set_shutdown_cb, .get_sndtimeo = l2cap_sock_get_sndtimeo_cb, + .get_peer_pid = l2cap_sock_get_peer_pid_cb, .alloc_skb = l2cap_sock_alloc_skb_cb, }; -- cgit v1.2.3 From 32b50729d91f0b59336851bf765b9423add00710 Mon Sep 17 00:00:00 2001 From: Alain Michaud Date: Wed, 25 Mar 2020 14:48:34 +0000 Subject: Bluetooth: don't assume key size is 16 when the command fails With this change, the encryption key size is not assumed to be 16 if the read_encryption_key_size command fails for any reason. This ensures that if the controller fails the command for any reason that the encryption key size isn't implicitely set to 16 and instead take a more concervative posture to assume it is 0. Signed-off-by: Alain Michaud Signed-off-by: Marcel Holtmann --- net/bluetooth/hci_event.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'net') diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index cd3d7d90029b..0a591be8b0ae 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -2963,14 +2963,14 @@ static void read_enc_key_size_complete(struct hci_dev *hdev, u8 status, if (!conn) goto unlock; - /* If we fail to read the encryption key size, assume maximum - * (which is the same we do also when this HCI command isn't - * supported. + /* While unexpected, the read_enc_key_size command may fail. The most + * secure approach is to then assume the key size is 0 to force a + * disconnection. */ if (rp->status) { bt_dev_err(hdev, "failed to read key size for handle %u", handle); - conn->enc_key_size = HCI_LINK_KEY_SIZE; + conn->enc_key_size = 0; } else { conn->enc_key_size = rp->key_size; } -- cgit v1.2.3 From da49b602f7f75ccc91386e1274b3ef71676cd092 Mon Sep 17 00:00:00 2001 From: Luiz Augusto von Dentz Date: Wed, 25 Mar 2020 12:37:53 -0700 Subject: Bluetooth: L2CAP: Use DEFER_SETUP to group ECRED connections This uses the DEFER_SETUP flag to group channels with L2CAP_CREDIT_BASED_CONNECTION_REQ. Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Marcel Holtmann --- net/bluetooth/l2cap_core.c | 137 +++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 127 insertions(+), 10 deletions(-) (limited to 'net') diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index 8b0fca39989d..fd9d0d08f9c9 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -678,6 +678,29 @@ void l2cap_chan_del(struct l2cap_chan *chan, int err) } EXPORT_SYMBOL_GPL(l2cap_chan_del); +static void __l2cap_chan_list(struct l2cap_conn *conn, l2cap_chan_func_t func, + void *data) +{ + struct l2cap_chan *chan; + + list_for_each_entry(chan, &conn->chan_l, list) { + func(chan, data); + } +} + +void l2cap_chan_list(struct l2cap_conn *conn, l2cap_chan_func_t func, + void *data) +{ + if (!conn) + return; + + mutex_lock(&conn->chan_lock); + __l2cap_chan_list(conn, func, data); + mutex_unlock(&conn->chan_lock); +} + +EXPORT_SYMBOL_GPL(l2cap_chan_list); + static void l2cap_conn_update_id_addr(struct work_struct *work) { struct l2cap_conn *conn = container_of(work, struct l2cap_conn, @@ -1356,29 +1379,79 @@ static void l2cap_le_connect(struct l2cap_chan *chan) sizeof(req), &req); } -static void l2cap_ecred_connect(struct l2cap_chan *chan) -{ - struct l2cap_conn *conn = chan->conn; +struct l2cap_ecred_conn_data { struct { struct l2cap_ecred_conn_req req; - __le16 scid; + __le16 scid[5]; } __packed pdu; + struct l2cap_chan *chan; + struct pid *pid; + int count; +}; + +static void l2cap_ecred_defer_connect(struct l2cap_chan *chan, void *data) +{ + struct l2cap_ecred_conn_data *conn = data; + struct pid *pid; + + if (chan == conn->chan) + return; + + if (!test_and_clear_bit(FLAG_DEFER_SETUP, &chan->flags)) + return; + + pid = chan->ops->get_peer_pid(chan); + + /* Only add deferred channels with the same PID/PSM */ + if (conn->pid != pid || chan->psm != conn->chan->psm || chan->ident || + chan->mode != L2CAP_MODE_EXT_FLOWCTL || chan->state != BT_CONNECT) + return; if (test_and_set_bit(FLAG_ECRED_CONN_REQ_SENT, &chan->flags)) return; l2cap_ecred_init(chan, 0); - pdu.req.psm = chan->psm; - pdu.req.mtu = cpu_to_le16(chan->imtu); - pdu.req.mps = cpu_to_le16(chan->mps); - pdu.req.credits = cpu_to_le16(chan->rx_credits); - pdu.scid = cpu_to_le16(chan->scid); + /* Set the same ident so we can match on the rsp */ + chan->ident = conn->chan->ident; + + /* Include all channels deferred */ + conn->pdu.scid[conn->count] = cpu_to_le16(chan->scid); + + conn->count++; +} + +static void l2cap_ecred_connect(struct l2cap_chan *chan) +{ + struct l2cap_conn *conn = chan->conn; + struct l2cap_ecred_conn_data data; + + if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) + return; + + if (test_and_set_bit(FLAG_ECRED_CONN_REQ_SENT, &chan->flags)) + return; + + l2cap_ecred_init(chan, 0); + + data.pdu.req.psm = chan->psm; + data.pdu.req.mtu = cpu_to_le16(chan->imtu); + data.pdu.req.mps = cpu_to_le16(chan->mps); + data.pdu.req.credits = cpu_to_le16(chan->rx_credits); + data.pdu.scid[0] = cpu_to_le16(chan->scid); chan->ident = l2cap_get_ident(conn); + data.pid = chan->ops->get_peer_pid(chan); + + data.count = 1; + data.chan = chan; + data.pid = chan->ops->get_peer_pid(chan); + + __l2cap_chan_list(conn, l2cap_ecred_defer_connect, &data); l2cap_send_cmd(conn, chan->ident, L2CAP_ECRED_CONN_REQ, - sizeof(pdu), &pdu); + sizeof(data.pdu.req) + data.count * sizeof(__le16), + &data.pdu); } static void l2cap_le_start(struct l2cap_chan *chan) @@ -7693,6 +7766,33 @@ static bool is_valid_psm(u16 psm, u8 dst_type) { return ((psm & 0x0101) == 0x0001); } +struct l2cap_chan_data { + struct l2cap_chan *chan; + struct pid *pid; + int count; +}; + +static void l2cap_chan_by_pid(struct l2cap_chan *chan, void *data) +{ + struct l2cap_chan_data *d = data; + struct pid *pid; + + if (chan == d->chan) + return; + + if (!test_bit(FLAG_DEFER_SETUP, &chan->flags)) + return; + + pid = chan->ops->get_peer_pid(chan); + + /* Only count deferred channels with the same PID/PSM */ + if (d->pid != pid || chan->psm != d->chan->psm || chan->ident || + chan->mode != L2CAP_MODE_EXT_FLOWCTL || chan->state != BT_CONNECT) + return; + + d->count++; +} + int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, bdaddr_t *dst, u8 dst_type) { @@ -7812,6 +7912,23 @@ int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, goto done; } + if (chan->mode == L2CAP_MODE_EXT_FLOWCTL) { + struct l2cap_chan_data data; + + data.chan = chan; + data.pid = chan->ops->get_peer_pid(chan); + data.count = 1; + + l2cap_chan_list(conn, l2cap_chan_by_pid, &data); + + /* Check if there isn't too many channels being connected */ + if (data.count > L2CAP_ECRED_CONN_SCID_MAX) { + hci_conn_drop(hcon); + err = -EPROTO; + goto done; + } + } + mutex_lock(&conn->chan_lock); l2cap_chan_lock(chan); -- cgit v1.2.3