Bluetooth: Add management support for user confirmation request

This patch adds support for the user confirmation (numeric comparison)
Secure Simple Pairing authentication method.

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

2 files changed, 153 insertions, 0 deletions

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 98b5764e4315..604c7b5fee97 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -796,6 +796,29 @@ static void hci_cc_le_read_buffer_size(struct hci_dev *hdev,
         hci_req_complete(hdev, HCI_OP_LE_READ_BUFFER_SIZE, rp->status);
 }
 
+static void hci_cc_user_confirm_reply(struct hci_dev *hdev, struct sk_buff *skb)
+{
+        struct hci_rp_user_confirm_reply *rp = (void *) skb->data;
+
+        BT_DBG("%s status 0x%x", hdev->name, rp->status);
+
+        if (test_bit(HCI_MGMT, &hdev->flags))
+                mgmt_user_confirm_reply_complete(hdev->id, &rp->bdaddr,
+                                                                rp->status);
+}
+
+static void hci_cc_user_confirm_neg_reply(struct hci_dev *hdev,
+                                                        struct sk_buff *skb)
+{
+        struct hci_rp_user_confirm_reply *rp = (void *) skb->data;
+
+        BT_DBG("%s status 0x%x", hdev->name, rp->status);
+
+        if (test_bit(HCI_MGMT, &hdev->flags))
+                mgmt_user_confirm_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);
@@ -1728,6 +1751,14 @@ static inline void hci_cmd_complete_evt(struct hci_dev *hdev, struct sk_buff *sk
                 hci_cc_le_read_buffer_size(hdev, skb);
                 break;
 
+        case HCI_OP_USER_CONFIRM_REPLY:
+                hci_cc_user_confirm_reply(hdev, skb);
+                break;
+
+        case HCI_OP_USER_CONFIRM_NEG_REPLY:
+                hci_cc_user_confirm_neg_reply(hdev, skb);
+                break;
+
         default:
                 BT_DBG("%s opcode 0x%x", hdev->name, opcode);
                 break;
@@ -2362,6 +2393,21 @@ unlock:
         hci_dev_unlock(hdev);
 }
 
+static inline void hci_user_confirm_request_evt(struct hci_dev *hdev,
+                                                        struct sk_buff *skb)
+{
+        struct hci_ev_user_confirm_req *ev = (void *) skb->data;
+
+        BT_DBG("%s", hdev->name);
+
+        hci_dev_lock(hdev);
+
+        if (test_bit(HCI_MGMT, &hdev->flags))
+                mgmt_user_confirm_request(hdev->id, &ev->bdaddr, ev->passkey);
+
+        hci_dev_unlock(hdev);
+}
+
 static inline void hci_simple_pair_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
 {
         struct hci_ev_simple_pair_complete *ev = (void *) skb->data;
@@ -2580,6 +2626,10 @@ void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb)
                 hci_io_capa_reply_evt(hdev, skb);
                 break;
 
+        case HCI_EV_USER_CONFIRM_REQUEST:
+                hci_user_confirm_request_evt(hdev, skb);
+                break;
+
         case HCI_EV_SIMPLE_PAIR_COMPLETE:
                 hci_simple_pair_complete_evt(hdev, skb);
                 break;
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index d7fc54dcbc9e..fdcc9742bb00 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -1193,6 +1193,55 @@ unlock:
         return err;
 }
 
+static int user_confirm_reply(struct sock *sk, unsigned char *data, u16 len,
+                                                                int success)
+{
+        struct mgmt_cp_user_confirm_reply *cp = (void *) data;
+        u16 dev_id, mgmt_op, hci_op;
+        struct pending_cmd *cmd;
+        struct hci_dev *hdev;
+        int err;
+
+        BT_DBG("");
+
+        dev_id = get_unaligned_le16(&cp->index);
+
+        if (success) {
+                mgmt_op = MGMT_OP_USER_CONFIRM_REPLY;
+                hci_op = HCI_OP_USER_CONFIRM_REPLY;
+        } else {
+                mgmt_op = MGMT_OP_USER_CONFIRM_NEG_REPLY;
+                hci_op = HCI_OP_USER_CONFIRM_NEG_REPLY;
+        }
+
+        hdev = hci_dev_get(dev_id);
+        if (!hdev)
+                return cmd_status(sk, mgmt_op, ENODEV);
+
+        if (!test_bit(HCI_UP, &hdev->flags)) {
+                err = cmd_status(sk, mgmt_op, ENETDOWN);
+                goto failed;
+        }
+
+        cmd = mgmt_pending_add(sk, mgmt_op, dev_id, data, len);
+        if (!cmd) {
+                err = -ENOMEM;
+                goto failed;
+        }
+
+        err = hci_send_cmd(hdev, hci_op, sizeof(cp->bdaddr), &cp->bdaddr);
+        if (err < 0) {
+                list_del(&cmd->list);
+                mgmt_pending_free(cmd);
+        }
+
+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;
@@ -1281,6 +1330,12 @@ int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)
         case MGMT_OP_PAIR_DEVICE:
                 err = pair_device(sk, buf + sizeof(*hdr), len);
                 break;
+        case MGMT_OP_USER_CONFIRM_REPLY:
+                err = user_confirm_reply(sk, buf + sizeof(*hdr), len, 1);
+                break;
+        case MGMT_OP_USER_CONFIRM_NEG_REPLY:
+                err = user_confirm_reply(sk, buf + sizeof(*hdr), len, 0);
+                break;
         default:
                 BT_DBG("Unknown op %u", opcode);
                 err = cmd_status(sk, opcode, 0x01);
@@ -1541,3 +1596,51 @@ int mgmt_pin_code_neg_reply_complete(u16 index, bdaddr_t *bdaddr, u8 status)
 
         return err;
 }
+
+int mgmt_user_confirm_request(u16 index, bdaddr_t *bdaddr, __le32 value)
+{
+        struct mgmt_ev_user_confirm_request ev;
+
+        BT_DBG("hci%u", index);
+
+        put_unaligned_le16(index, &ev.index);
+        bacpy(&ev.bdaddr, bdaddr);
+        put_unaligned_le32(value, &ev.value);
+
+        return mgmt_event(MGMT_EV_USER_CONFIRM_REQUEST, &ev, sizeof(ev), NULL);
+}
+
+static int confirm_reply_complete(u16 index, bdaddr_t *bdaddr, u8 status,
+                                                                u8 opcode)
+{
+        struct pending_cmd *cmd;
+        struct mgmt_rp_user_confirm_reply rp;
+        int err;
+
+        cmd = mgmt_pending_find(opcode, index);
+        if (!cmd)
+                return -ENOENT;
+
+        put_unaligned_le16(index, &rp.index);
+        bacpy(&rp.bdaddr, bdaddr);
+        rp.status = status;
+        err = cmd_complete(cmd->sk, opcode, &rp, sizeof(rp));
+
+        list_del(&cmd->list);
+        mgmt_pending_free(cmd);
+
+        return err;
+}
+
+int mgmt_user_confirm_reply_complete(u16 index, bdaddr_t *bdaddr, u8 status)
+{
+        return confirm_reply_complete(index, bdaddr, status,
+                                                MGMT_OP_USER_CONFIRM_REPLY);
+}
+
+int mgmt_user_confirm_neg_reply_complete(u16 index, bdaddr_t *bdaddr,
+                                                                u8 status)
+{
+        return confirm_reply_complete(index, bdaddr, status,
+                                        MGMT_OP_USER_CONFIRM_NEG_REPLY);
+}