From 2950f21acb0f6b8fcd964485c2ebf1e06545ac20 Mon Sep 17 00:00:00 2001 From: Marcel Holtmann Date: Thu, 12 Feb 2009 14:02:50 +0100 Subject: [PATCH] Bluetooth: Ask upper layers for HCI disconnect reason Some of the qualification tests demand that in case of failures in L2CAP the HCI disconnect should indicate a reason why L2CAP fails. This is a bluntly layer violation since multiple L2CAP connections could be using the same ACL and thus forcing a disconnect reason is not a good idea. To comply with the Bluetooth test specification, the disconnect reason is now stored in the L2CAP connection structure and every time a new L2CAP channel is added it will set back to its default. So only in the case where the L2CAP channel with the disconnect reason is really the last one, it will propagated to the HCI layer. The HCI layer has been extended with a disconnect indication that allows it to ask upper layers for a disconnect reason. The upper layer must not support this callback and in that case it will nicely default to the existing behavior. If an upper layer like L2CAP can provide a disconnect reason that one will be used to disconnect the ACL or SCO link. No modification to the ACL disconnect timeout have been made. So in case of Linux to Linux connection the initiator will disconnect the ACL link before the acceptor side can signal the specific disconnect reason. That is perfectly fine since Linux doesn't make use of this value anyway. The L2CAP layer has a perfect valid error code for rejecting connection due to a security violation. It is unclear why the Bluetooth specification insists on having specific HCI disconnect reason. Signed-off-by: Marcel Holtmann --- include/net/bluetooth/hci_core.h | 25 +++++++++++++++++++++---- include/net/bluetooth/l2cap.h | 2 ++ net/bluetooth/hci_conn.c | 6 ++++-- net/bluetooth/hci_event.c | 2 +- net/bluetooth/l2cap.c | 20 +++++++++++++++++++- net/bluetooth/sco.c | 4 ++-- 6 files changed, 49 insertions(+), 10 deletions(-) diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index 9473fce499e7..01f9316b4c23 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -478,7 +478,8 @@ struct hci_proto { int (*connect_ind) (struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 type); int (*connect_cfm) (struct hci_conn *conn, __u8 status); - int (*disconn_ind) (struct hci_conn *conn, __u8 reason); + int (*disconn_ind) (struct hci_conn *conn); + int (*disconn_cfm) (struct hci_conn *conn, __u8 reason); int (*recv_acldata) (struct hci_conn *conn, struct sk_buff *skb, __u16 flags); int (*recv_scodata) (struct hci_conn *conn, struct sk_buff *skb); int (*security_cfm) (struct hci_conn *conn, __u8 status, __u8 encrypt); @@ -513,17 +514,33 @@ static inline void hci_proto_connect_cfm(struct hci_conn *conn, __u8 status) hp->connect_cfm(conn, status); } -static inline void hci_proto_disconn_ind(struct hci_conn *conn, __u8 reason) +static inline int hci_proto_disconn_ind(struct hci_conn *conn) { register struct hci_proto *hp; + int reason = 0x13; hp = hci_proto[HCI_PROTO_L2CAP]; if (hp && hp->disconn_ind) - hp->disconn_ind(conn, reason); + reason = hp->disconn_ind(conn); hp = hci_proto[HCI_PROTO_SCO]; if (hp && hp->disconn_ind) - hp->disconn_ind(conn, reason); + reason = hp->disconn_ind(conn); + + return reason; +} + +static inline void hci_proto_disconn_cfm(struct hci_conn *conn, __u8 reason) +{ + register struct hci_proto *hp; + + hp = hci_proto[HCI_PROTO_L2CAP]; + if (hp && hp->disconn_cfm) + hp->disconn_cfm(conn, reason); + + hp = hci_proto[HCI_PROTO_SCO]; + if (hp && hp->disconn_cfm) + hp->disconn_cfm(conn, reason); } static inline void hci_proto_auth_cfm(struct hci_conn *conn, __u8 status) diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h index 54737c5dc86c..f566aa1f0a4c 100644 --- a/include/net/bluetooth/l2cap.h +++ b/include/net/bluetooth/l2cap.h @@ -221,6 +221,8 @@ struct l2cap_conn { __u8 rx_ident; __u8 tx_ident; + __u8 disc_reason; + struct l2cap_chan_list chan_list; }; diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c index dcdaa4be7847..96281a11a186 100644 --- a/net/bluetooth/hci_conn.c +++ b/net/bluetooth/hci_conn.c @@ -159,6 +159,7 @@ static void hci_conn_timeout(unsigned long arg) { struct hci_conn *conn = (void *) arg; struct hci_dev *hdev = conn->hdev; + __u8 reason; BT_DBG("conn %p state %d", conn, conn->state); @@ -177,7 +178,8 @@ static void hci_conn_timeout(unsigned long arg) break; case BT_CONFIG: case BT_CONNECTED: - hci_acl_disconn(conn, 0x13); + reason = hci_proto_disconn_ind(conn); + hci_acl_disconn(conn, reason); break; default: conn->state = BT_CLOSED; @@ -562,7 +564,7 @@ void hci_conn_hash_flush(struct hci_dev *hdev) hci_conn_del_sysfs(c); - hci_proto_disconn_ind(c, 0x16); + hci_proto_disconn_cfm(c, 0x16); hci_conn_del(c); } } diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index 899b8991a466..c396542c2b82 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -1021,7 +1021,7 @@ static inline void hci_disconn_complete_evt(struct hci_dev *hdev, struct sk_buff hci_conn_del_sysfs(conn); - hci_proto_disconn_ind(conn, ev->reason); + hci_proto_disconn_cfm(conn, ev->reason); hci_conn_del(conn); } diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c index 7bba469b6828..d563f2ebcbb3 100644 --- a/net/bluetooth/l2cap.c +++ b/net/bluetooth/l2cap.c @@ -206,6 +206,8 @@ static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct so BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); + conn->disc_reason = 0x13; + l2cap_pi(sk)->conn = conn; if (sk->sk_type == SOCK_SEQPACKET) { @@ -491,6 +493,8 @@ static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) spin_lock_init(&conn->lock); rwlock_init(&conn->chan_list.lock); + conn->disc_reason = 0x13; + return conn; } @@ -1840,6 +1844,7 @@ static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hd /* Check if the ACL is secure enough (if not SDP) */ if (psm != cpu_to_le16(0x0001) && !hci_conn_check_link_mode(conn->hcon)) { + conn->disc_reason = 0x05; result = L2CAP_CR_SEC_BLOCK; goto response; } @@ -2472,7 +2477,19 @@ static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) return 0; } -static int l2cap_disconn_ind(struct hci_conn *hcon, u8 reason) +static int l2cap_disconn_ind(struct hci_conn *hcon) +{ + struct l2cap_conn *conn = hcon->l2cap_data; + + BT_DBG("hcon %p", hcon); + + if (hcon->type != ACL_LINK || !conn) + return 0x13; + + return conn->disc_reason; +} + +static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) { BT_DBG("hcon %p reason %d", hcon, reason); @@ -2717,6 +2734,7 @@ static struct hci_proto l2cap_hci_proto = { .connect_ind = l2cap_connect_ind, .connect_cfm = l2cap_connect_cfm, .disconn_ind = l2cap_disconn_ind, + .disconn_cfm = l2cap_disconn_cfm, .security_cfm = l2cap_security_cfm, .recv_acldata = l2cap_recv_acldata }; diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c index 7f10f97cd697..51ae0c3e470a 100644 --- a/net/bluetooth/sco.c +++ b/net/bluetooth/sco.c @@ -902,7 +902,7 @@ static int sco_connect_cfm(struct hci_conn *hcon, __u8 status) return 0; } -static int sco_disconn_ind(struct hci_conn *hcon, __u8 reason) +static int sco_disconn_cfm(struct hci_conn *hcon, __u8 reason) { BT_DBG("hcon %p reason %d", hcon, reason); @@ -985,7 +985,7 @@ static struct hci_proto sco_hci_proto = { .id = HCI_PROTO_SCO, .connect_ind = sco_connect_ind, .connect_cfm = sco_connect_cfm, - .disconn_ind = sco_disconn_ind, + .disconn_cfm = sco_disconn_cfm, .recv_scodata = sco_recv_scodata }; -- 2.39.2