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Bluetooth: Add smp_ltk_sec_level() helper function

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There are several places that need to determine the security level that
an LTK can provide. This patch adds a convenience function for this to
help make the code more readable.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Johan Hedberg 2014-09-10 17:37:45 -07:00 committed by Marcel Holtmann
parent 1afc2a1ab6
commit a6f7833ca3
3 changed files with 10 additions and 5 deletions
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5
net/bluetooth/hci_event.c
View file

@ -4506,10 +4506,7 @@ static void hci_le_ltk_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
memcpy(cp.ltk, ltk->val, sizeof(ltk->val)); memcpy(cp.ltk, ltk->val, sizeof(ltk->val));
cp.handle = cpu_to_le16(conn->handle); cp.handle = cpu_to_le16(conn->handle);
if (ltk->authenticated) conn->pending_sec_level = smp_ltk_sec_level(ltk);
conn->pending_sec_level = BT_SECURITY_HIGH;
else
conn->pending_sec_level = BT_SECURITY_MEDIUM;
conn->enc_key_size = ltk->enc_size; conn->enc_key_size = ltk->enc_size;

2
net/bluetooth/smp.c
View file

@ -1114,7 +1114,7 @@ static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level)
if (!key) if (!key)
return false; return false;
if (sec_level > BT_SECURITY_MEDIUM && !key->authenticated) if (smp_ltk_sec_level(key) < sec_level)
return false; return false;
if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))

8
net/bluetooth/smp.h
View file

@ -125,6 +125,14 @@ enum {
SMP_LTK_SLAVE, SMP_LTK_SLAVE,
}; };
static inline u8 smp_ltk_sec_level(struct smp_ltk *key)
{
if (key->authenticated)
return BT_SECURITY_HIGH;
return BT_SECURITY_MEDIUM;
}
/* SMP Commands */ /* SMP Commands */
bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level); bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level);
int smp_conn_security(struct hci_conn *hcon, __u8 sec_level); int smp_conn_security(struct hci_conn *hcon, __u8 sec_level);