Exemple #1
0
void dccp_send_close(struct sock *sk, const int active)
{
	struct dccp_sock *dp = dccp_sk(sk);
	struct sk_buff *skb;
	const gfp_t prio = active ? GFP_KERNEL : GFP_ATOMIC;

	skb = alloc_skb(sk->sk_prot->max_header, prio);
	if (skb == NULL)
		return;

	
	skb_reserve(skb, sk->sk_prot->max_header);
	if (dp->dccps_role == DCCP_ROLE_SERVER && !dp->dccps_server_timewait)
		DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_CLOSEREQ;
	else
		DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_CLOSE;

	if (active) {
		dccp_write_xmit(sk, 1);
		dccp_skb_entail(sk, skb);
		dccp_transmit_skb(sk, skb_clone(skb, prio));
		
		inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
					  DCCP_TIMEOUT_INIT, DCCP_RTO_MAX);
	} else
		dccp_transmit_skb(sk, skb);
}
Exemple #2
0
int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
		 size_t len)
{
	const struct dccp_sock *dp = dccp_sk(sk);
	const int flags = msg->msg_flags;
	const int noblock = flags & MSG_DONTWAIT;
	struct sk_buff *skb;
	int rc, size;
	long timeo;

	if (len > dp->dccps_mss_cache)
		return -EMSGSIZE;

	lock_sock(sk);

	if (sysctl_dccp_tx_qlen &&
	    (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) {
		rc = -EAGAIN;
		goto out_release;
	}

	timeo = sock_sndtimeo(sk, noblock);

	/*
	 * We have to use sk_stream_wait_connect here to set sk_write_pending,
	 * so that the trick in dccp_rcv_request_sent_state_process.
	 */
	/* Wait for a connection to finish. */
	if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN))
		if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0)
			goto out_release;

	size = sk->sk_prot->max_header + len;
	release_sock(sk);
	skb = sock_alloc_send_skb(sk, size, noblock, &rc);
	lock_sock(sk);
	if (skb == NULL)
		goto out_release;

	skb_reserve(skb, sk->sk_prot->max_header);
	rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
	if (rc != 0)
		goto out_discard;

	skb_queue_tail(&sk->sk_write_queue, skb);
	/*
	 * The xmit_timer is set if the TX CCID is rate-based and will expire
	 * when congestion control permits to release further packets into the
	 * network. Window-based CCIDs do not use this timer.
	 */
	if (!timer_pending(&dp->dccps_xmit_timer))
		dccp_write_xmit(sk);
out_release:
	release_sock(sk);
	return rc ? : len;
out_discard:
	kfree_skb(skb);
	goto out_release;
}
int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
		 size_t len)
{
	const struct dccp_sock *dp = dccp_sk(sk);
	const int flags = msg->msg_flags;
	const int noblock = flags & MSG_DONTWAIT;
	struct sk_buff *skb;
	int rc, size;
	long timeo;

	if (len > dp->dccps_mss_cache)
		return -EMSGSIZE;

	lock_sock(sk);
	timeo = sock_sndtimeo(sk, noblock);

	/*
	 * We have to use sk_stream_wait_connect here to set sk_write_pending,
	 * so that the trick in dccp_rcv_request_sent_state_process.
	 */
	/* Wait for a connection to finish. */
	if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN | DCCPF_CLOSING))
		if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0)
			goto out_release;

	size = sk->sk_prot->max_header + len;
	release_sock(sk);
	skb = sock_alloc_send_skb(sk, size, noblock, &rc);
	lock_sock(sk);
	if (skb == NULL)
		goto out_release;

	skb_reserve(skb, sk->sk_prot->max_header);
	rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
	if (rc != 0)
		goto out_discard;

	rc = dccp_write_xmit(sk, skb, &timeo);
	/*
	 * XXX we don't use sk_write_queue, so just discard the packet.
	 *     Current plan however is to _use_ sk_write_queue with
	 *     an algorith similar to tcp_sendmsg, where the main difference
	 *     is that in DCCP we have to respect packet boundaries, so
	 *     no coalescing of skbs.
	 *
	 *     This bug was _quickly_ found & fixed by just looking at an OSTRA
	 *     generated callgraph 8) -acme
	 */
out_release:
	release_sock(sk);
	return rc ? : len;
out_discard:
	kfree_skb(skb);
	goto out_release;
}
Exemple #4
0
static void dccp_write_xmit_timer(unsigned long data) {
	struct sock *sk = (struct sock *)data;
	struct dccp_sock *dp = dccp_sk(sk);

	bh_lock_sock(sk);
	if (sock_owned_by_user(sk))
		sk_reset_timer(sk, &dp->dccps_xmit_timer, jiffies+1);
	else
		dccp_write_xmit(sk, 0);
	bh_unlock_sock(sk);
	sock_put(sk);
}
Exemple #5
0
int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
		 size_t len)
{
	const struct dccp_sock *dp = dccp_sk(sk);
	const int flags = msg->msg_flags;
	const int noblock = flags & MSG_DONTWAIT;
	struct sk_buff *skb;
	int rc, size;
	long timeo;

	if (len > dp->dccps_mss_cache)
		return -EMSGSIZE;

	lock_sock(sk);

	if (sysctl_dccp_tx_qlen &&
	    (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) {
		rc = -EAGAIN;
		goto out_release;
	}

	timeo = sock_sndtimeo(sk, noblock);

	
	
	if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN))
		if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0)
			goto out_release;

	size = sk->sk_prot->max_header + len;
	release_sock(sk);
	skb = sock_alloc_send_skb(sk, size, noblock, &rc);
	lock_sock(sk);
	if (skb == NULL)
		goto out_release;

	skb_reserve(skb, sk->sk_prot->max_header);
	rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
	if (rc != 0)
		goto out_discard;

	skb_queue_tail(&sk->sk_write_queue, skb);
	dccp_write_xmit(sk,0);
out_release:
	release_sock(sk);
	return rc ? : len;
out_discard:
	kfree_skb(skb);
	goto out_release;
}
Exemple #6
0
/*
 * Send a DCCP_PKT_CLOSE/CLOSEREQ. The caller locks the socket for us. This
 * cannot be allowed to fail queueing a DCCP_PKT_CLOSE/CLOSEREQ frame under
 * any circumstances.
 */
void dccp_send_close(struct sock *sk, const int active)
{
	struct dccp_sock *dp = dccp_sk(sk);
	struct sk_buff *skb;
	const gfp_t prio = active ? GFP_KERNEL : GFP_ATOMIC;

	skb = alloc_skb(sk->sk_prot->max_header, prio);
	if (skb == NULL)
		return;

	/* Reserve space for headers and prepare control bits. */
	skb_reserve(skb, sk->sk_prot->max_header);
	DCCP_SKB_CB(skb)->dccpd_type = dp->dccps_role == DCCP_ROLE_CLIENT ?
					DCCP_PKT_CLOSE : DCCP_PKT_CLOSEREQ;

	if (active) {
		dccp_write_xmit(sk, 1);
		dccp_skb_entail(sk, skb);
		dccp_transmit_skb(sk, skb_clone(skb, prio));
		/* FIXME do we need a retransmit timer here? */
	} else
		dccp_transmit_skb(sk, skb);
}
Exemple #7
0
/*
 * Send a DCCP_PKT_CLOSE/CLOSEREQ. The caller locks the socket for us. This
 * cannot be allowed to fail queueing a DCCP_PKT_CLOSE/CLOSEREQ frame under
 * any circumstances.
 */
void dccp_send_close(struct sock *sk, const int active)
{
    struct dccp_sock *dp = dccp_sk(sk);
    struct sk_buff *skb;
    const gfp_t prio = active ? GFP_KERNEL : GFP_ATOMIC;

    skb = alloc_skb(sk->sk_prot->max_header, prio);
    if (skb == NULL)
        return;

    /* Reserve space for headers and prepare control bits. */
    skb_reserve(skb, sk->sk_prot->max_header);
    if (dp->dccps_role == DCCP_ROLE_SERVER && !dp->dccps_server_timewait)
        DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_CLOSEREQ;
    else
        DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_CLOSE;

    if (active) {
        dccp_write_xmit(sk, 1);
        dccp_skb_entail(sk, skb);
        dccp_transmit_skb(sk, skb_clone(skb, prio));
        /*
         * Retransmission timer for active-close: RFC 4340, 8.3 requires
         * to retransmit the Close/CloseReq until the CLOSING/CLOSEREQ
         * state can be left. The initial timeout is 2 RTTs.
         * Since RTT measurement is done by the CCIDs, there is no easy
         * way to get an RTT sample. The fallback RTT from RFC 4340, 3.4
         * is too low (200ms); we use a high value to avoid unnecessary
         * retransmissions when the link RTT is > 0.2 seconds.
         * FIXME: Let main module sample RTTs and use that instead.
         */
        inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
                      DCCP_TIMEOUT_INIT, DCCP_RTO_MAX);
    } else
        dccp_transmit_skb(sk, skb);
}