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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2007-12-13 12:02:43 -0200
committerDavid S. Miller <davem@davemloft.net>2008-01-28 14:57:47 -0800
commit92d31920b84f258badf206eea8aaf5ac677ac535 (patch)
treeb61c5a87ccd5110638df0a4d44924d8dffacbcf1 /net/dccp/output.c
parent09f7709f4929666006931f1d4efc498a6d419bbc (diff)
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[DCCP]: Shift the retransmit timer for active-close into output.c
When performing active close, RFC 4340, 8.3. requires to retransmit the Close/CloseReq with a backoff-retransmit timer starting at intially 2 RTTs. This patch shifts the existing code for active-close retransmit timer into output.c, so that the retransmit timer is started when the first Close/CloseReq is sent. Previously, the timer was started when, after releasing the socket in dccp_close(), the actively-closing side had not yet reached the CLOSED/TIMEWAIT state. The patch further reduces the initial timeout from 3 seconds to the required 2 RTTs, where - in absence of a known RTT - the fallback value specified in RFC 4340, 3.4 is used. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp/output.c')
-rw-r--r--net/dccp/output.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/net/dccp/output.c b/net/dccp/output.c
index 7caa7f57bb7e..e97584aa4898 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -574,7 +574,18 @@ void dccp_send_close(struct sock *sk, const int 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? */
+ /*
+ * 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);
}