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Commit cf6c2c0b authored by Gustavo Padovan's avatar Gustavo Padovan Committed by Marcel Holtmann
Browse files

Bluetooth: Disconnect early if mode is not supported 



When mode is mandatory we shall not send connect request and report this
to the userspace as well.

Signed-off-by: default avatarGustavo F. Padovan <padovan@profusion.mobi>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 2ba13ed6

include/net/bluetooth/l2cap.h

+5 −0
Original line number Diff line number Diff line
@@ -287,6 +287,11 @@ struct l2cap_conn { 
	struct l2cap_chan_list chan_list;

};



struct sock_del_list {

	struct sock *sk;

	struct list_head list;

};



#define L2CAP_INFO_CL_MTU_REQ_SENT	0x01

#define L2CAP_INFO_FEAT_MASK_REQ_SENT	0x04

#define L2CAP_INFO_FEAT_MASK_REQ_DONE	0x08

net/bluetooth/l2cap.c

+40 −16
Original line number Diff line number Diff line
@@ -456,6 +456,22 @@ static void l2cap_do_start(struct sock *sk) 
	}

}



static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)

{

	u32 local_feat_mask = l2cap_feat_mask;

	if (enable_ertm)

		local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;



	switch (mode) {

	case L2CAP_MODE_ERTM:

		return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;

	case L2CAP_MODE_STREAMING:

		return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;

	default:

		return 0x00;

	}

}



static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err)

{

	struct l2cap_disconn_req req;
@@ -484,10 +500,13 @@ static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int 
static void l2cap_conn_start(struct l2cap_conn *conn)

{

	struct l2cap_chan_list *l = &conn->chan_list;

	struct sock_del_list del, *tmp1, *tmp2;

	struct sock *sk;



	BT_DBG("conn %p", conn);



	INIT_LIST_HEAD(&del.list);



	read_lock(&l->lock);



	for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
@@ -503,6 +522,19 @@ static void l2cap_conn_start(struct l2cap_conn *conn) 
			if (l2cap_check_security(sk) &&

					__l2cap_no_conn_pending(sk)) {

				struct l2cap_conn_req req;



				if (!l2cap_mode_supported(l2cap_pi(sk)->mode,

						conn->feat_mask)

						&& l2cap_pi(sk)->conf_state &

						L2CAP_CONF_STATE2_DEVICE) {

					tmp1 = kzalloc(sizeof(struct srej_list),

							GFP_ATOMIC);

					tmp1->sk = sk;

					list_add_tail(&tmp1->list, &del.list);

					bh_unlock_sock(sk);

					continue;

				}



				req.scid = cpu_to_le16(l2cap_pi(sk)->scid);

				req.psm  = l2cap_pi(sk)->psm;
@@ -542,6 +574,14 @@ static void l2cap_conn_start(struct l2cap_conn *conn) 
	}



	read_unlock(&l->lock);



	list_for_each_entry_safe(tmp1, tmp2, &del.list, list) {

		bh_lock_sock(tmp1->sk);

		__l2cap_sock_close(tmp1->sk, ECONNRESET);

		bh_unlock_sock(tmp1->sk);

		list_del(&tmp1->list);

		kfree(tmp1);

	}

}



static void l2cap_conn_ready(struct l2cap_conn *conn)
@@ -2429,22 +2469,6 @@ static inline void l2cap_ertm_init(struct sock *sk) 
	INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work);

}



static int l2cap_mode_supported(__u8 mode, __u32 feat_mask)

{

	u32 local_feat_mask = l2cap_feat_mask;

	if (enable_ertm)

		local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;



	switch (mode) {

	case L2CAP_MODE_ERTM:

		return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;

	case L2CAP_MODE_STREAMING:

		return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;

	default:

		return 0x00;

	}

}



static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)

{

	switch (mode) {