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Bluetooth: Add debug setting for changing minimum encryption key size

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For testing and qualification purposes it is useful to allow changing
the minimum encryption key size value that the host stack is going to
enforce. This adds a new debugfs setting min_encrypt_key_size to achieve
this functionality.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Marcel Holtmann 2019-07-16 20:34:41 +02:00 committed by Johan Hedberg
parent 6600c0808e
commit 58a96fc353
4 changed files with 34 additions and 1 deletions
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1
include/net/bluetooth/hci_core.h
View File

@ -278,6 +278,7 @@ struct hci_dev {
__u16 conn_info_min_age;
__u16 conn_info_max_age;
__u16 auth_payload_timeout;
__u8 min_enc_key_size;
__u8 ssp_debug_mode;
__u8 hw_error_code;
__u32 clock;

1
net/bluetooth/hci_core.c
View File

@ -3202,6 +3202,7 @@ struct hci_dev *hci_alloc_dev(void)
hdev->conn_info_min_age = DEFAULT_CONN_INFO_MIN_AGE;
hdev->conn_info_max_age = DEFAULT_CONN_INFO_MAX_AGE;
hdev->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
hdev->min_enc_key_size = HCI_MIN_ENC_KEY_SIZE;
mutex_init(&hdev->lock);
mutex_init(&hdev->req_lock);

31
net/bluetooth/hci_debugfs.c
View File

@ -433,6 +433,35 @@ static int auto_accept_delay_set(void *data, u64 val)
return 0;
}
static int min_encrypt_key_size_set(void *data, u64 val)
{
struct hci_dev *hdev = data;
if (val < 1 || val > 16)
return -EINVAL;
hci_dev_lock(hdev);
hdev->min_enc_key_size = val;
hci_dev_unlock(hdev);
return 0;
}
static int min_encrypt_key_size_get(void *data, u64 *val)
{
struct hci_dev *hdev = data;
hci_dev_lock(hdev);
*val = hdev->min_enc_key_size;
hci_dev_unlock(hdev);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(min_encrypt_key_size_fops,
min_encrypt_key_size_get,
min_encrypt_key_size_set, "%llu\n");
static int auto_accept_delay_get(void *data, u64 *val)
{
struct hci_dev *hdev = data;
@ -545,6 +574,8 @@ void hci_debugfs_create_bredr(struct hci_dev *hdev)
if (lmp_ssp_capable(hdev)) {
debugfs_create_file("ssp_debug_mode", 0444, hdev->debugfs,
hdev, &ssp_debug_mode_fops);
debugfs_create_file("min_encrypt_key_size", 0644, hdev->debugfs,
hdev, &min_encrypt_key_size_fops);
debugfs_create_file("auto_accept_delay", 0644, hdev->debugfs,
hdev, &auto_accept_delay_fops);
}

2
net/bluetooth/l2cap_core.c
View File

@ -1361,7 +1361,7 @@ static bool l2cap_check_enc_key_size(struct hci_conn *hcon)
* actually encrypted before enforcing a key size.
*/
return (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags) ||
hcon->enc_key_size >= HCI_MIN_ENC_KEY_SIZE);
hcon->enc_key_size >= hcon->hdev->min_enc_key_size);
}
static void l2cap_do_start(struct l2cap_chan *chan)