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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
parentfb78525ae1b75bfac1da600ceb008aef4d293649 (diff)
[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>
-rw-r--r--include/net/sctp/structs.h1
-rw-r--r--net/sctp/associola.c9
-rw-r--r--net/sctp/transport.c32
3 files changed, 42 insertions, 0 deletions
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 31a8e88f1a7..f431acf3dce 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1002,6 +1002,7 @@ void sctp_transport_update_rto(struct sctp_transport *, __u32);
void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32);
void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t);
unsigned long sctp_transport_timeout(struct sctp_transport *);
+void sctp_transport_reset(struct sctp_transport *);
/* This is the structure we use to queue packets as they come into
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 2505cd3b8d2..78d2ddb5ca1 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -1046,6 +1046,9 @@ void sctp_assoc_update(struct sctp_association *asoc,
trans = list_entry(pos, struct sctp_transport, transports);
if (!sctp_assoc_lookup_paddr(new, &trans->ipaddr))
sctp_assoc_del_peer(asoc, &trans->ipaddr);
+
+ if (asoc->state >= SCTP_STATE_ESTABLISHED)
+ sctp_transport_reset(trans);
}
/* If the case is A (association restart), use
@@ -1069,6 +1072,12 @@ void sctp_assoc_update(struct sctp_association *asoc,
*/
sctp_ulpq_flush(&asoc->ulpq);
+ /* reset the overall association error count so
+ * that the restarted association doesn't get torn
+ * down on the next retransmission timer.
+ */
+ asoc->overall_error_count = 0;
+
} else {
/* Add any peer addresses from the new association. */
list_for_each(pos, &new->peer.transport_addr_list) {
diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index a596f5308cb..c4699f5c409 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;
+}