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Bluetooth: Add debug setting for changing minimum encryption key size 

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)