Bluetooth: Expose current list of long term keys via debugfs

For debugging purposes expose the current list of long term keys
via debugfs. This file is read-only and limited to root access.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 8710d1f..6b1844f 100644 (file)
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -385,6 +385,36 @@ static const struct file_operations static_address_fops = {
        .release        = single_release,
 };
 
+static int long_term_keys_show(struct seq_file *f, void *ptr)
+{
+       struct hci_dev *hdev = f->private;
+       struct list_head *p, *n;
+
+       hci_dev_lock(hdev);
+       list_for_each_safe(p, n, &hdev->link_keys) {
+               struct smp_ltk *ltk = list_entry(p, struct smp_ltk, list);
+               seq_printf(f, "%pMR (type %u) %u %u %u %.4x %*phN %*phN\\n",
+                          &ltk->bdaddr, ltk->bdaddr_type, ltk->authenticated,
+                          ltk->type, ltk->enc_size, __le16_to_cpu(ltk->ediv),
+                          8, ltk->rand, 16, ltk->val);
+       }
+       hci_dev_unlock(hdev);
+
+       return 0;
+}
+
+static int long_term_keys_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, long_term_keys_show, inode->i_private);
+}
+
+static const struct file_operations long_term_keys_fops = {
+       .open           = long_term_keys_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = single_release,
+};
+
 /* ---- HCI requests ---- */
 
 static void hci_req_sync_complete(struct hci_dev *hdev, u8 result)
@@ -1121,6 +1151,8 @@ static int __hci_init(struct hci_dev *hdev)
                                  &hdev->le_white_list_size);
                debugfs_create_file("static_address", 0444, hdev->debugfs,
                                   hdev, &static_address_fops);
+               debugfs_create_file("long_term_keys", 0400, hdev->debugfs,
+                                   hdev, &long_term_keys_fops);
        }
 
        return 0;