Beispiel #1
0
static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct l2cap_pinfo *pi = l2cap_pi(sk);
	struct sk_buff *skb;
	struct sk_buff_head seg_queue;
	int err;
	u8 amp_id;

	BT_DBG("sock %p, sk %p", sock, sk);

	err = sock_error(sk);
	if (err)
		return err;

	if (msg->msg_flags & MSG_OOB)
		return -EOPNOTSUPP;

	lock_sock(sk);

	if (sk->sk_state != BT_CONNECTED) {
		err = -ENOTCONN;
		goto done;
	}

	/* Connectionless channel */
	if (sk->sk_type == SOCK_DGRAM) {
		skb = l2cap_create_connless_pdu(sk, msg, len);
		if (IS_ERR(skb)) {
			err = PTR_ERR(skb);
		} else {
			l2cap_do_send(sk, skb);
			err = len;
		}
		goto done;
	}

	switch (pi->mode) {
	case L2CAP_MODE_BASIC:
		/* Check outgoing MTU */
		if (len > pi->omtu) {
			err = -EMSGSIZE;
			goto done;
		}

		/* Create a basic PDU */
		skb = l2cap_create_basic_pdu(sk, msg, len);
		if (IS_ERR(skb)) {
			err = PTR_ERR(skb);
			goto done;
		}

		l2cap_do_send(sk, skb);
		err = len;
		break;

	case L2CAP_MODE_ERTM:
	case L2CAP_MODE_STREAMING:

		/* Check outgoing MTU */
		if (len > pi->omtu) {
			err = -EMSGSIZE;
			goto done;
		}

		__skb_queue_head_init(&seg_queue);

		/* Do segmentation before calling in to the state machine,
		 * since it's possible to block while waiting for memory
		 * allocation.
		 */
		amp_id = pi->amp_id;
		err = l2cap_segment_sdu(sk, &seg_queue, msg, len, 0);

		/* The socket lock is released while segmenting, so check
		 * that the socket is still connected
		 */
		if (sk->sk_state != BT_CONNECTED) {
			__skb_queue_purge(&seg_queue);
			err = -ENOTCONN;
		}

		if (err) {
			BT_DBG("Error %d, sk_sndbuf %d, sk_wmem_alloc %d",
				err, sk->sk_sndbuf,
				atomic_read(&sk->sk_wmem_alloc));
			break;
		}

		if (pi->amp_id != amp_id) {
			/* Channel moved while unlocked. Resegment. */
			err = l2cap_resegment_queue(sk, &seg_queue);

			if (err)
				break;
		}

		if (pi->mode != L2CAP_MODE_STREAMING)
			err = l2cap_ertm_tx(sk, 0, &seg_queue,
				L2CAP_ERTM_EVENT_DATA_REQUEST);
		else
			err = l2cap_strm_tx(sk, &seg_queue);
		if (!err)
			err = len;

		/* If the skbs were not queued for sending, they'll still be in
		 * seg_queue and need to be purged.
		 */
		__skb_queue_purge(&seg_queue);
		break;

	default:
		BT_DBG("bad state %1.1x", pi->mode);
		err = -EBADFD;
	}

done:
	release_sock(sk);
	return err;
}
Beispiel #2
0
static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct l2cap_pinfo *pi = l2cap_pi(sk);
	struct sk_buff *skb;
	struct sk_buff_head seg_queue;
	int err;
	u8 amp_id;

	BT_DBG("sock %p, sk %p", sock, sk);

	err = sock_error(sk);
	if (err)
		return err;

	if (msg->msg_flags & MSG_OOB)
		return -EOPNOTSUPP;

	lock_sock(sk);

	if (sk->sk_state != BT_CONNECTED) {
		err = -ENOTCONN;
		goto done;
	}

	
	if (sk->sk_type == SOCK_DGRAM) {
		skb = l2cap_create_connless_pdu(sk, msg, len);
		if (IS_ERR(skb)) {
			err = PTR_ERR(skb);
		} else {
			l2cap_do_send(sk, skb);
			err = len;
		}
		goto done;
	}

	switch (pi->mode) {
	case L2CAP_MODE_BASIC:
		
		if (len > pi->omtu) {
			err = -EMSGSIZE;
			goto done;
		}

		
		skb = l2cap_create_basic_pdu(sk, msg, len);
		if (IS_ERR(skb)) {
			err = PTR_ERR(skb);
			goto done;
		}

		l2cap_do_send(sk, skb);
		err = len;
		break;

	case L2CAP_MODE_ERTM:
	case L2CAP_MODE_STREAMING:

		
		if (len > pi->omtu) {
			err = -EMSGSIZE;
			goto done;
		}

		__skb_queue_head_init(&seg_queue);

		amp_id = pi->amp_id;
		err = l2cap_segment_sdu(sk, &seg_queue, msg, len, 0);

		if (sk->sk_state != BT_CONNECTED) {
			__skb_queue_purge(&seg_queue);
			err = -ENOTCONN;
		}

		if (err) {
			BT_DBG("Error %d, sk_sndbuf %d, sk_wmem_alloc %d",
				err, sk->sk_sndbuf,
				atomic_read(&sk->sk_wmem_alloc));
			break;
		}

		if (pi->amp_id != amp_id) {
			
			err = l2cap_resegment_queue(sk, &seg_queue);

			if (err)
				break;
		}

		if (pi->mode != L2CAP_MODE_STREAMING)
			err = l2cap_ertm_tx(sk, 0, &seg_queue,
				L2CAP_ERTM_EVENT_DATA_REQUEST);
		else
			err = l2cap_strm_tx(sk, &seg_queue);
		if (!err)
			err = len;

		__skb_queue_purge(&seg_queue);
		break;

	default:
		BT_DBG("bad state %1.1x", pi->mode);
		err = -EBADFD;
	}

done:
	release_sock(sk);
	return err;
}