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authorVlad Yasevich <vladislav.yasevich@hp.com>2007-03-19 17:02:30 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-03-20 00:09:45 -0700
commit749bf9215ed1a8b6edb4bb03693c2b62c6b9c2a4 (patch)
treed5656c441181fddef41392a4aa07f54e56487312 /net/sctp/transport.c
parentfb78525ae1b75bfac1da600ceb008aef4d293649 (diff)
downloadkernel-749bf9215ed1a8b6edb4bb03693c2b62c6b9c2a4.tar.gz
[SCTP]: Reset some transport and association variables on restart
If the association has been restarted, we need to reset the transport congestion variables as well as accumulated error counts and CACC variables. If we do not, the association will use the wrong values and may terminate prematurely. This was found with a scenario where the peer restarted the association when lksctp was in the last HB timeout for its association. The restart happened, but the error counts have not been reset and when the timeout occurred, a newly restarted association was terminated due to excessive retransmits. Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by: Sridhar Samudrala <sri@us.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/transport.c')
-rw-r--r--net/sctp/transport.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index a596f5308cb1..c4699f5c409d 100644
--- a/net/sctp/transport.c
+++ b/net/sctp/transport.c
@@ -526,3 +526,35 @@ unsigned long sctp_transport_timeout(struct sctp_transport *t)
timeout += jiffies;
return timeout;
}
+
+/* Reset transport variables to their initial values */
+void sctp_transport_reset(struct sctp_transport *t)
+{
+ struct sctp_association *asoc = t->asoc;
+
+ /* RFC 2960 (bis), Section 5.2.4
+ * All the congestion control parameters (e.g., cwnd, ssthresh)
+ * related to this peer MUST be reset to their initial values
+ * (see Section 6.2.1)
+ */
+ t->cwnd = min(4*asoc->pathmtu, max_t(__u32, 2*asoc->pathmtu, 4380));
+ t->ssthresh = SCTP_DEFAULT_MAXWINDOW;
+ t->rto = asoc->rto_initial;
+ t->rtt = 0;
+ t->srtt = 0;
+ t->rttvar = 0;
+
+ /* Reset these additional varibles so that we have a clean
+ * slate.
+ */
+ t->partial_bytes_acked = 0;
+ t->flight_size = 0;
+ t->error_count = 0;
+ t->rto_pending = 0;
+
+ /* Initialize the state information for SFR-CACC */
+ t->cacc.changeover_active = 0;
+ t->cacc.cycling_changeover = 0;
+ t->cacc.next_tsn_at_change = 0;
+ t->cacc.cacc_saw_newack = 0;
+}