Bluetooth: Implement link key handling for the management interface
This patch adds a management commands to feed the kernel with all stored
link keys as well as remove specific ones or all of them. Once the
load_keys command has been called the kernel takes over link key
replies. A new_key event is also added to inform userspace of newly
created link keys that should be stored permanently.
Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 748f5a6..8ca8cf1 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -970,6 +970,88 @@
return 0;
}
+int hci_link_keys_clear(struct hci_dev *hdev)
+{
+ struct list_head *p, *n;
+
+ list_for_each_safe(p, n, &hdev->link_keys) {
+ struct link_key *key;
+
+ key = list_entry(p, struct link_key, list);
+
+ list_del(p);
+ kfree(key);
+ }
+
+ return 0;
+}
+
+struct link_key *hci_find_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr)
+{
+ struct list_head *p;
+
+ list_for_each(p, &hdev->link_keys) {
+ struct link_key *k;
+
+ k = list_entry(p, struct link_key, list);
+
+ if (bacmp(bdaddr, &k->bdaddr) == 0)
+ return k;
+ }
+
+ return NULL;
+}
+
+int hci_add_link_key(struct hci_dev *hdev, int new_key, bdaddr_t *bdaddr,
+ u8 *val, u8 type, u8 pin_len)
+{
+ struct link_key *key, *old_key;
+ u8 old_key_type;
+
+ old_key = hci_find_link_key(hdev, bdaddr);
+ if (old_key) {
+ old_key_type = old_key->type;
+ key = old_key;
+ } else {
+ old_key_type = 0xff;
+ key = kzalloc(sizeof(*key), GFP_ATOMIC);
+ if (!key)
+ return -ENOMEM;
+ list_add(&key->list, &hdev->link_keys);
+ }
+
+ BT_DBG("%s key for %s type %u", hdev->name, batostr(bdaddr), type);
+
+ bacpy(&key->bdaddr, bdaddr);
+ memcpy(key->val, val, 16);
+ key->type = type;
+ key->pin_len = pin_len;
+
+ if (new_key)
+ mgmt_new_key(hdev->id, key, old_key_type);
+
+ if (type == 0x06)
+ key->type = old_key_type;
+
+ return 0;
+}
+
+int hci_remove_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr)
+{
+ struct link_key *key;
+
+ key = hci_find_link_key(hdev, bdaddr);
+ if (!key)
+ return -ENOENT;
+
+ BT_DBG("%s removing %s", hdev->name, batostr(bdaddr));
+
+ list_del(&key->list);
+ kfree(key);
+
+ return 0;
+}
+
/* Register HCI device */
int hci_register_dev(struct hci_dev *hdev)
{
@@ -1029,6 +1111,8 @@
INIT_LIST_HEAD(&hdev->uuids);
+ INIT_LIST_HEAD(&hdev->link_keys);
+
INIT_WORK(&hdev->power_on, hci_power_on);
INIT_WORK(&hdev->power_off, hci_power_off);
setup_timer(&hdev->off_timer, hci_auto_off, (unsigned long) hdev);
@@ -1105,6 +1189,7 @@
hci_dev_lock_bh(hdev);
hci_blacklist_clear(hdev);
hci_uuids_clear(hdev);
+ hci_link_keys_clear(hdev);
hci_dev_unlock_bh(hdev);
__hci_dev_put(hdev);
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index c69ee44..80ffd3a 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -1810,13 +1810,60 @@
static inline void hci_link_key_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
{
+ struct hci_ev_link_key_req *ev = (void *) skb->data;
+ struct hci_cp_link_key_reply cp;
+ struct hci_conn *conn;
+ struct link_key *key;
+
BT_DBG("%s", hdev->name);
+
+ if (!test_bit(HCI_LINK_KEYS, &hdev->flags))
+ return;
+
+ hci_dev_lock(hdev);
+
+ key = hci_find_link_key(hdev, &ev->bdaddr);
+ if (!key) {
+ BT_DBG("%s link key not found for %s", hdev->name,
+ batostr(&ev->bdaddr));
+ goto not_found;
+ }
+
+ BT_DBG("%s found key type %u for %s", hdev->name, key->type,
+ batostr(&ev->bdaddr));
+
+ if (!test_bit(HCI_DEBUG_KEYS, &hdev->flags) && key->type == 0x03) {
+ BT_DBG("%s ignoring debug key", hdev->name);
+ goto not_found;
+ }
+
+ conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &ev->bdaddr);
+
+ if (key->type == 0x04 && conn && conn->auth_type != 0xff &&
+ (conn->auth_type & 0x01)) {
+ BT_DBG("%s ignoring unauthenticated key", hdev->name);
+ goto not_found;
+ }
+
+ bacpy(&cp.bdaddr, &ev->bdaddr);
+ memcpy(cp.link_key, key->val, 16);
+
+ hci_send_cmd(hdev, HCI_OP_LINK_KEY_REPLY, sizeof(cp), &cp);
+
+ hci_dev_unlock(hdev);
+
+ return;
+
+not_found:
+ hci_send_cmd(hdev, HCI_OP_LINK_KEY_NEG_REPLY, 6, &ev->bdaddr);
+ hci_dev_unlock(hdev);
}
static inline void hci_link_key_notify_evt(struct hci_dev *hdev, struct sk_buff *skb)
{
struct hci_ev_link_key_notify *ev = (void *) skb->data;
struct hci_conn *conn;
+ u8 pin_len = 0;
BT_DBG("%s", hdev->name);
@@ -1829,6 +1876,10 @@
hci_conn_put(conn);
}
+ if (test_bit(HCI_LINK_KEYS, &hdev->flags))
+ hci_add_link_key(hdev, 1, &ev->bdaddr, ev->link_key,
+ ev->key_type, pin_len);
+
hci_dev_unlock(hdev);
}
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index a08f4ce..bdb0e85 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -794,6 +794,99 @@
return err;
}
+static int load_keys(struct sock *sk, unsigned char *data, u16 len)
+{
+ struct hci_dev *hdev;
+ struct mgmt_cp_load_keys *cp;
+ u16 dev_id, key_count, expected_len;
+ int i;
+
+ cp = (void *) data;
+ dev_id = get_unaligned_le16(&cp->index);
+ key_count = get_unaligned_le16(&cp->key_count);
+
+ expected_len = sizeof(*cp) + key_count * sizeof(struct mgmt_key_info);
+ if (expected_len != len) {
+ BT_ERR("load_keys: expected %u bytes, got %u bytes",
+ len, expected_len);
+ return -EINVAL;
+ }
+
+ hdev = hci_dev_get(dev_id);
+ if (!hdev)
+ return cmd_status(sk, MGMT_OP_LOAD_KEYS, ENODEV);
+
+ BT_DBG("hci%u debug_keys %u key_count %u", dev_id, cp->debug_keys,
+ key_count);
+
+ hci_dev_lock_bh(hdev);
+
+ hci_link_keys_clear(hdev);
+
+ set_bit(HCI_LINK_KEYS, &hdev->flags);
+
+ if (cp->debug_keys)
+ set_bit(HCI_DEBUG_KEYS, &hdev->flags);
+ else
+ clear_bit(HCI_DEBUG_KEYS, &hdev->flags);
+
+ for (i = 0; i < key_count; i++) {
+ struct mgmt_key_info *key = &cp->keys[i];
+
+ hci_add_link_key(hdev, 0, &key->bdaddr, key->val, key->type,
+ key->pin_len);
+ }
+
+ hci_dev_unlock_bh(hdev);
+ hci_dev_put(hdev);
+
+ return 0;
+}
+
+static int remove_key(struct sock *sk, unsigned char *data, u16 len)
+{
+ struct hci_dev *hdev;
+ struct mgmt_cp_remove_key *cp;
+ struct hci_conn *conn;
+ u16 dev_id;
+ int err;
+
+ cp = (void *) data;
+ dev_id = get_unaligned_le16(&cp->index);
+
+ hdev = hci_dev_get(dev_id);
+ if (!hdev)
+ return cmd_status(sk, MGMT_OP_REMOVE_KEY, ENODEV);
+
+ hci_dev_lock_bh(hdev);
+
+ err = hci_remove_link_key(hdev, &cp->bdaddr);
+ if (err < 0) {
+ err = cmd_status(sk, MGMT_OP_REMOVE_KEY, -err);
+ goto unlock;
+ }
+
+ err = 0;
+
+ if (!test_bit(HCI_UP, &hdev->flags) || !cp->disconnect)
+ goto unlock;
+
+ conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &cp->bdaddr);
+ if (conn) {
+ struct hci_cp_disconnect dc;
+
+ put_unaligned_le16(conn->handle, &dc.handle);
+ dc.reason = 0x13; /* Remote User Terminated Connection */
+ err = hci_send_cmd(hdev, HCI_OP_DISCONNECT, 0, NULL);
+ }
+
+unlock:
+ 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;
@@ -858,6 +951,12 @@
case MGMT_OP_SET_SERVICE_CACHE:
err = set_service_cache(sk, buf + sizeof(*hdr), len);
break;
+ case MGMT_OP_LOAD_KEYS:
+ err = load_keys(sk, buf + sizeof(*hdr), len);
+ break;
+ case MGMT_OP_REMOVE_KEY:
+ err = remove_key(sk, buf + sizeof(*hdr), len);
+ break;
default:
BT_DBG("Unknown op %u", opcode);
err = cmd_status(sk, opcode, 0x01);
@@ -974,3 +1073,20 @@
return ret;
}
+
+int mgmt_new_key(u16 index, struct link_key *key, u8 old_key_type)
+{
+ struct mgmt_ev_new_key ev;
+
+ memset(&ev, 0, sizeof(ev));
+
+ put_unaligned_le16(index, &ev.index);
+
+ bacpy(&ev.key.bdaddr, &key->bdaddr);
+ ev.key.type = key->type;
+ memcpy(ev.key.val, key->val, 16);
+ ev.key.pin_len = key->pin_len;
+ ev.old_key_type = old_key_type;
+
+ return mgmt_event(MGMT_EV_NEW_KEY, &ev, sizeof(ev), NULL);
+}