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>

5 files changed, 219 insertions, 0 deletions

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 08fbf1253b8..e8e52da2b26 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -309,11 +309,19 @@ struct hci_cp_pin_code_reply {
 	__u8     pin_len;
 	__u8     pin_code[16];
 } __packed;
+struct hci_rp_pin_code_reply {
+	__u8     status;
+	bdaddr_t bdaddr;
+} __packed;
 
 #define HCI_OP_PIN_CODE_NEG_REPLY	0x040e
 struct hci_cp_pin_code_neg_reply {
 	bdaddr_t bdaddr;
 } __packed;
+struct hci_rp_pin_code_neg_reply {
+	__u8     status;
+	bdaddr_t bdaddr;
+} __packed;
 
 #define HCI_OP_CHANGE_CONN_PTYPE	0x040f
 struct hci_cp_change_conn_ptype {
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 45caae62cb8..9ac3da6e4a9 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -213,6 +213,7 @@ struct hci_conn {
 	__u8             auth_type;
 	__u8             sec_level;
 	__u8		 pending_sec_level;
+	__u8		 pin_length;
 	__u8             power_save;
 	__u16            disc_timeout;
 	unsigned long	 pend;
@@ -718,6 +719,9 @@ int mgmt_connected(u16 index, bdaddr_t *bdaddr);
 int mgmt_disconnected(u16 index, bdaddr_t *bdaddr);
 int mgmt_disconnect_failed(u16 index);
 int mgmt_connect_failed(u16 index, bdaddr_t *bdaddr, u8 status);
+int mgmt_pin_code_request(u16 index, bdaddr_t *bdaddr);
+int mgmt_pin_code_reply_complete(u16 index, bdaddr_t *bdaddr, u8 status);
+int mgmt_pin_code_neg_reply_complete(u16 index, bdaddr_t *bdaddr, u8 status);
 
 /* HCI info for socket */
 #define hci_pi(sk) ((struct hci_pinfo *) sk)
diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index 3d8d589fa55..46fb56d21b5 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -140,6 +140,20 @@ struct mgmt_rp_get_connections {
 	bdaddr_t conn[0];
 } __packed;
 
+#define MGMT_OP_PIN_CODE_REPLY		0x0011
+struct mgmt_cp_pin_code_reply {
+	__le16 index;
+	bdaddr_t bdaddr;
+	__u8 pin_len;
+	__u8 pin_code[16];
+} __packed;
+
+#define MGMT_OP_PIN_CODE_NEG_REPLY	0x0012
+struct mgmt_cp_pin_code_neg_reply {
+	__le16 index;
+	bdaddr_t bdaddr;
+} __packed;
+
 #define MGMT_EV_CMD_COMPLETE		0x0001
 struct mgmt_ev_cmd_complete {
 	__le16 opcode;
@@ -201,3 +215,9 @@ struct mgmt_ev_connect_failed {
 	bdaddr_t bdaddr;
 	__u8 status;
 } __packed;
+
+#define MGMT_EV_PIN_CODE_REQUEST	0x000E
+struct mgmt_ev_pin_code_request {
+	__le16 index;
+	bdaddr_t bdaddr;
+} __packed;
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;
+}