Bluetooth: Add support for PIN code handling in the management interface

This patch adds the necessary commands and events needed to communicate
PIN code related actions between the kernel and userspace. This includes
a pin_code_request event as well as pin_code_reply and
pin_code_negative_reply commands.

Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

2 files changed, 187 insertions, 0 deletions

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 995ae6c17f1..98bcf78f202 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -743,6 +743,40 @@ static void hci_cc_set_event_flt(struct hci_dev *hdev, struct sk_buff *skb)
 	hci_req_complete(hdev, HCI_OP_SET_EVENT_FLT, status);
 }
 
+static void hci_cc_pin_code_reply(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct hci_rp_pin_code_reply *rp = (void *) skb->data;
+	struct hci_cp_pin_code_reply *cp;
+	struct hci_conn *conn;
+
+	BT_DBG("%s status 0x%x", hdev->name, rp->status);
+
+	if (test_bit(HCI_MGMT, &hdev->flags))
+		mgmt_pin_code_reply_complete(hdev->id, &rp->bdaddr, rp->status);
+
+	if (rp->status != 0)
+		return;
+
+	cp = hci_sent_cmd_data(hdev, HCI_OP_PIN_CODE_REPLY);
+	if (!cp)
+		return;
+
+	conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &cp->bdaddr);
+	if (conn)
+		conn->pin_length = cp->pin_len;
+}
+
+static void hci_cc_pin_code_neg_reply(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct hci_rp_pin_code_neg_reply *rp = (void *) skb->data;
+
+	BT_DBG("%s status 0x%x", hdev->name, rp->status);
+
+	if (test_bit(HCI_MGMT, &hdev->flags))
+		mgmt_pin_code_neg_reply_complete(hdev->id, &rp->bdaddr,
+								rp->status);
+}
+
 static inline void hci_cs_inquiry(struct hci_dev *hdev, __u8 status)
 {
 	BT_DBG("%s status 0x%x", hdev->name, status);
@@ -1619,6 +1653,14 @@ static inline void hci_cmd_complete_evt(struct hci_dev *hdev, struct sk_buff *sk
 		hci_cc_set_event_flt(hdev, skb);
 		break;
 
+	case HCI_OP_PIN_CODE_REPLY:
+		hci_cc_pin_code_reply(hdev, skb);
+		break;
+
+	case HCI_OP_PIN_CODE_NEG_REPLY:
+		hci_cc_pin_code_neg_reply(hdev, skb);
+		break;
+
 	default:
 		BT_DBG("%s opcode 0x%x", hdev->name, opcode);
 		break;
@@ -1821,6 +1863,9 @@ static inline void hci_pin_code_request_evt(struct hci_dev *hdev, struct sk_buff
 		hci_send_cmd(hdev, HCI_OP_PIN_CODE_NEG_REPLY,
 					sizeof(ev->bdaddr), &ev->bdaddr);
 
+	if (test_bit(HCI_MGMT, &hdev->flags))
+		mgmt_pin_code_request(hdev->id, &ev->bdaddr);
+
 	hci_dev_unlock(hdev);
 }
 
@@ -1889,6 +1934,7 @@ static inline void hci_link_key_notify_evt(struct hci_dev *hdev, struct sk_buff
 	if (conn) {
 		hci_conn_hold(conn);
 		conn->disc_timeout = HCI_DISCONN_TIMEOUT;
+		pin_len = conn->pin_length;
 		hci_conn_put(conn);
 	}
 
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 005288b2a58..3800aaf5792 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -933,6 +933,89 @@ unlock:
 	return err;
 }
 
+static int pin_code_reply(struct sock *sk, unsigned char *data, u16 len)
+{
+	struct hci_dev *hdev;
+	struct mgmt_cp_pin_code_reply *cp;
+	struct hci_cp_pin_code_reply reply;
+	u16 dev_id;
+	int err;
+
+	BT_DBG("");
+
+	cp = (void *) data;
+	dev_id = get_unaligned_le16(&cp->index);
+
+	hdev = hci_dev_get(dev_id);
+	if (!hdev)
+		return cmd_status(sk, MGMT_OP_DISCONNECT, ENODEV);
+
+	hci_dev_lock_bh(hdev);
+
+	if (!test_bit(HCI_UP, &hdev->flags)) {
+		err = cmd_status(sk, MGMT_OP_PIN_CODE_REPLY, ENETDOWN);
+		goto failed;
+	}
+
+	err = mgmt_pending_add(sk, MGMT_OP_PIN_CODE_REPLY, dev_id, data, len);
+	if (err < 0)
+		goto failed;
+
+	bacpy(&reply.bdaddr, &cp->bdaddr);
+	reply.pin_len = cp->pin_len;
+	memcpy(reply.pin_code, cp->pin_code, 16);
+
+	err = hci_send_cmd(hdev, HCI_OP_PIN_CODE_REPLY, sizeof(reply), &reply);
+	if (err < 0)
+		mgmt_pending_remove(MGMT_OP_PIN_CODE_REPLY, dev_id);
+
+failed:
+	hci_dev_unlock_bh(hdev);
+	hci_dev_put(hdev);
+
+	return err;
+}
+
+static int pin_code_neg_reply(struct sock *sk, unsigned char *data, u16 len)
+{
+	struct hci_dev *hdev;
+	struct mgmt_cp_pin_code_neg_reply *cp;
+	u16 dev_id;
+	int err;
+
+	BT_DBG("");
+
+	cp = (void *) data;
+	dev_id = get_unaligned_le16(&cp->index);
+
+	hdev = hci_dev_get(dev_id);
+	if (!hdev)
+		return cmd_status(sk, MGMT_OP_PIN_CODE_NEG_REPLY, ENODEV);
+
+	hci_dev_lock_bh(hdev);
+
+	if (!test_bit(HCI_UP, &hdev->flags)) {
+		err = cmd_status(sk, MGMT_OP_PIN_CODE_NEG_REPLY, ENETDOWN);
+		goto failed;
+	}
+
+	err = mgmt_pending_add(sk, MGMT_OP_PIN_CODE_NEG_REPLY, dev_id,
+								data, len);
+	if (err < 0)
+		goto failed;
+
+	err = hci_send_cmd(hdev, HCI_OP_PIN_CODE_NEG_REPLY, sizeof(bdaddr_t),
+								&cp->bdaddr);
+	if (err < 0)
+		mgmt_pending_remove(MGMT_OP_PIN_CODE_NEG_REPLY, dev_id);
+
+failed:
+	hci_dev_unlock_bh(hdev);
+	hci_dev_put(hdev);
+
+	return err;
+}
+
 int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)
 {
 	unsigned char *buf;
@@ -1009,6 +1092,12 @@ int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)
 	case MGMT_OP_GET_CONNECTIONS:
 		err = get_connections(sk, buf + sizeof(*hdr), len);
 		break;
+	case MGMT_OP_PIN_CODE_REPLY:
+		err = pin_code_reply(sk, buf + sizeof(*hdr), len);
+		break;
+	case MGMT_OP_PIN_CODE_NEG_REPLY:
+		err = pin_code_neg_reply(sk, buf + sizeof(*hdr), len);
+		break;
 	default:
 		BT_DBG("Unknown op %u", opcode);
 		err = cmd_status(sk, opcode, 0x01);
@@ -1217,3 +1306,55 @@ int mgmt_connect_failed(u16 index, bdaddr_t *bdaddr, u8 status)
 
 	return mgmt_event(MGMT_EV_CONNECT_FAILED, &ev, sizeof(ev), NULL);
 }
+
+int mgmt_pin_code_request(u16 index, bdaddr_t *bdaddr)
+{
+	struct mgmt_ev_pin_code_request ev;
+
+	put_unaligned_le16(index, &ev.index);
+	bacpy(&ev.bdaddr, bdaddr);
+
+	return mgmt_event(MGMT_EV_PIN_CODE_REQUEST, &ev, sizeof(ev), NULL);
+}
+
+int mgmt_pin_code_reply_complete(u16 index, bdaddr_t *bdaddr, u8 status)
+{
+	struct pending_cmd *cmd;
+	int err;
+
+	cmd = mgmt_pending_find(MGMT_OP_PIN_CODE_REPLY, index);
+	if (!cmd)
+		return -ENOENT;
+
+	if (status != 0)
+		err = cmd_status(cmd->sk, MGMT_OP_PIN_CODE_REPLY, status);
+	else
+		err = cmd_complete(cmd->sk, MGMT_OP_PIN_CODE_REPLY,
+						bdaddr, sizeof(*bdaddr));
+
+	list_del(&cmd->list);
+	mgmt_pending_free(cmd);
+
+	return err;
+}
+
+int mgmt_pin_code_neg_reply_complete(u16 index, bdaddr_t *bdaddr, u8 status)
+{
+	struct pending_cmd *cmd;
+	int err;
+
+	cmd = mgmt_pending_find(MGMT_OP_PIN_CODE_NEG_REPLY, index);
+	if (!cmd)
+		return -ENOENT;
+
+	if (status != 0)
+		err = cmd_status(cmd->sk, MGMT_OP_PIN_CODE_NEG_REPLY, status);
+	else
+		err = cmd_complete(cmd->sk, MGMT_OP_PIN_CODE_NEG_REPLY,
+						bdaddr, sizeof(*bdaddr));
+
+	list_del(&cmd->list);
+	mgmt_pending_free(cmd);
+
+	return err;
+}