diff options
| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2007-12-13 12:02:43 -0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 14:57:47 -0800 |
| commit | 92d31920b84f258badf206eea8aaf5ac677ac535 (patch) | |
| tree | b61c5a87ccd5110638df0a4d44924d8dffacbcf1 /net/dccp/output.c | |
| parent | 09f7709f4929666006931f1d4efc498a6d419bbc (diff) | |
| download | linux-92d31920b84f258badf206eea8aaf5ac677ac535.tar.bz2 | |
[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.c | 13 |
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); } |