Commit fcd289df authored by Mat Martineau's avatar Mat Martineau Committed by Johan Hedberg
Browse files

Bluetooth: Handle incoming REJ frames 



REJ frames are sent by the remote device to request that all frames
after a given sequence number be retransmitted.  These are also an
implicit indication that the remote device is not in a busy state and
can receive new iframes.

Signed-off-by: default avatarMat Martineau <mathewm@codeaurora.org>
Signed-off-by: default avatarGustavo Padovan <gustavo.padovan@collabora.co.uk>
parent f80842a8

net/bluetooth/l2cap_core.c

+32 −1
Original line number Diff line number Diff line
@@ -4613,7 +4613,38 @@ static void l2cap_handle_srej(struct l2cap_chan *chan, 
static void l2cap_handle_rej(struct l2cap_chan *chan,

			     struct l2cap_ctrl *control)

{

	/* Placeholder */

	struct sk_buff *skb;



	BT_DBG("chan %p, control %p", chan, control);



	if (control->reqseq == chan->next_tx_seq) {

		BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);

		l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);

		return;

	}



	skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);



	if (chan->max_tx && skb &&

	    bt_cb(skb)->control.retries >= chan->max_tx) {

		BT_DBG("Retry limit exceeded (%d)", chan->max_tx);

		l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);

		return;

	}



	clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);



	l2cap_pass_to_tx(chan, control);



	if (control->final) {

		if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))

			l2cap_retransmit_all(chan, control);

	} else {

		l2cap_retransmit_all(chan, control);

		l2cap_ertm_send(chan);

		if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)

			set_bit(CONN_REJ_ACT, &chan->conn_state);

	}

}



static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)

CRA Git | Maintained and supported by SUSTech CRA and CCSE