From f62e4323ab43c59e7cd7f72c1eb392d7c767ce5a Mon Sep 17 00:00:00 2001 From: Marcel Holtmann Date: Thu, 15 Jan 2009 21:58:44 +0100 Subject: [PATCH] Bluetooth: Disconnect L2CAP connections without encryption For L2CAP connections with high security setting, the link will be immediately dropped when the encryption gets disabled. For L2CAP connections with medium security there will be grace period where the remote device has the chance to re-enable encryption. If it doesn't happen then the link will also be disconnected. The requirement for the grace period with medium security comes from Bluetooth 2.0 and earlier devices that require role switching. Signed-off-by: Marcel Holtmann --- net/bluetooth/l2cap.c | 26 +++++++++++++++++++------- 1 file changed, 19 insertions(+), 7 deletions(-) diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c index e899a9371c00..b2d279c245cf 100644 --- a/net/bluetooth/l2cap.c +++ b/net/bluetooth/l2cap.c @@ -77,7 +77,9 @@ static void l2cap_sock_timeout(unsigned long arg) bh_lock_sock(sk); - if (sk->sk_state == BT_CONNECT && + if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG) + reason = ECONNREFUSED; + else if (sk->sk_state == BT_CONNECT && l2cap_pi(sk)->sec_level != BT_SECURITY_SDP) reason = ECONNREFUSED; else @@ -2400,6 +2402,20 @@ static int l2cap_disconn_ind(struct hci_conn *hcon, u8 reason) return 0; } +static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) +{ + if (encrypt == 0x00) { + if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { + l2cap_sock_clear_timer(sk); + l2cap_sock_set_timer(sk, HZ * 5); + } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) + __l2cap_sock_close(sk, ECONNREFUSED); + } else { + if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) + l2cap_sock_clear_timer(sk); + } +} + static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) { struct l2cap_chan_list *l; @@ -2416,15 +2432,11 @@ static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) read_lock(&l->lock); for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { - struct l2cap_pinfo *pi = l2cap_pi(sk); - bh_lock_sock(sk); - if (!status && encrypt == 0x00 && - pi->sec_level == BT_SECURITY_HIGH && - (sk->sk_state == BT_CONNECTED || + if (!status && (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG)) { - __l2cap_sock_close(sk, ECONNREFUSED); + l2cap_check_encryption(sk, encrypt); bh_unlock_sock(sk); continue; } -- 2.20.1