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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2010-10-27 19:16:27 +0000
committerDavid S. Miller <davem@davemloft.net>2010-10-28 10:27:01 -0700
commitb1fcf55eea541af9efa5d39f5a0d1aec8ceca55d (patch)
treea021b6abde9c784d67ee0de3bb7fb31f7d5b2e9f /net/dccp/proto.c
parentdccp: Extend CCID packet dequeueing interface (diff)
downloadlinux-dev-b1fcf55eea541af9efa5d39f5a0d1aec8ceca55d.tar.xz
linux-dev-b1fcf55eea541af9efa5d39f5a0d1aec8ceca55d.zip
dccp: Refine the wait-for-ccid mechanism
This extends the existing wait-for-ccid routine so that it may be used with different types of CCID, addressing the following problems: 1) The queue-drain mechanism only works with rate-based CCIDs. If CCID-2 for example has a full TX queue and becomes network-limited just as the application wants to close, then waiting for CCID-2 to become unblocked could lead to an indefinite delay (i.e., application "hangs"). 2) Since each TX CCID in turn uses a feedback mechanism, there may be changes in its sending policy while the queue is being drained. This can lead to further delays during which the application will not be able to terminate. 3) The minimum wait time for CCID-3/4 can be expected to be the queue length times the current inter-packet delay. For example if tx_qlen=100 and a delay of 15 ms is used for each packet, then the application would have to wait for a minimum of 1.5 seconds before being allowed to exit. 4) There is no way for the user/application to control this behaviour. It would be good to use the timeout argument of dccp_close() as an upper bound. Then the maximum time that an application is willing to wait for its CCIDs to can be set via the SO_LINGER option. These problems are addressed by giving the CCID a grace period of up to the `timeout' value. The wait-for-ccid function is, as before, used when the application (a) has read all the data in its receive buffer and (b) if SO_LINGER was set with a non-zero linger time, or (c) the socket is either in the OPEN (active close) or in the PASSIVE_CLOSEREQ state (client application closes after receiving CloseReq). In addition, there is a catch-all case of __skb_queue_purge() after waiting for the CCID. This is necessary since the write queue may still have data when (a) the host has been passively-closed, (b) abnormal termination (unread data, zero linger time), (c) wait-for-ccid could not finish within the given time limit. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp/proto.c')
-rw-r--r--net/dccp/proto.c21
1 files changed, 20 insertions, 1 deletions
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index 7e5fc04eb6d1..ef343d53fcea 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -726,7 +726,13 @@ int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
goto out_discard;
skb_queue_tail(&sk->sk_write_queue, skb);
- dccp_write_xmit(sk,0);
+ /*
+ * 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;
@@ -951,9 +957,22 @@ void dccp_close(struct sock *sk, long timeout)
/* Check zero linger _after_ checking for unread data. */
sk->sk_prot->disconnect(sk, 0);
} else if (sk->sk_state != DCCP_CLOSED) {
+ /*
+ * Normal connection termination. May need to wait if there are
+ * still packets in the TX queue that are delayed by the CCID.
+ */
+ dccp_flush_write_queue(sk, &timeout);
dccp_terminate_connection(sk);
}
+ /*
+ * Flush write queue. This may be necessary in several cases:
+ * - we have been closed by the peer but still have application data;
+ * - abortive termination (unread data or zero linger time),
+ * - normal termination but queue could not be flushed within time limit
+ */
+ __skb_queue_purge(&sk->sk_write_queue);
+
sk_stream_wait_close(sk, timeout);
adjudge_to_death: