[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>
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@ -1002,6 +1002,7 @@ void sctp_transport_update_rto(struct sctp_transport *, __u32);
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void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32);
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void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t);
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unsigned long sctp_transport_timeout(struct sctp_transport *);
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void sctp_transport_reset(struct sctp_transport *);
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/* This is the structure we use to queue packets as they come into
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@ -1046,6 +1046,9 @@ void sctp_assoc_update(struct sctp_association *asoc,
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trans = list_entry(pos, struct sctp_transport, transports);
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if (!sctp_assoc_lookup_paddr(new, &trans->ipaddr))
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sctp_assoc_del_peer(asoc, &trans->ipaddr);
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if (asoc->state >= SCTP_STATE_ESTABLISHED)
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sctp_transport_reset(trans);
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}
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/* If the case is A (association restart), use
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@ -1069,6 +1072,12 @@ void sctp_assoc_update(struct sctp_association *asoc,
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*/
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sctp_ulpq_flush(&asoc->ulpq);
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/* reset the overall association error count so
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* that the restarted association doesn't get torn
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* down on the next retransmission timer.
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*/
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asoc->overall_error_count = 0;
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} else {
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/* Add any peer addresses from the new association. */
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list_for_each(pos, &new->peer.transport_addr_list) {
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@ -526,3 +526,35 @@ unsigned long sctp_transport_timeout(struct sctp_transport *t)
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timeout += jiffies;
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return timeout;
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}
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/* Reset transport variables to their initial values */
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void sctp_transport_reset(struct sctp_transport *t)
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{
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struct sctp_association *asoc = t->asoc;
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/* RFC 2960 (bis), Section 5.2.4
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* All the congestion control parameters (e.g., cwnd, ssthresh)
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* related to this peer MUST be reset to their initial values
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* (see Section 6.2.1)
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*/
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t->cwnd = min(4*asoc->pathmtu, max_t(__u32, 2*asoc->pathmtu, 4380));
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t->ssthresh = SCTP_DEFAULT_MAXWINDOW;
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t->rto = asoc->rto_initial;
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t->rtt = 0;
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t->srtt = 0;
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t->rttvar = 0;
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/* Reset these additional varibles so that we have a clean
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* slate.
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*/
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t->partial_bytes_acked = 0;
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t->flight_size = 0;
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t->error_count = 0;
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t->rto_pending = 0;
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/* Initialize the state information for SFR-CACC */
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t->cacc.changeover_active = 0;
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t->cacc.cycling_changeover = 0;
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t->cacc.next_tsn_at_change = 0;
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t->cacc.cacc_saw_newack = 0;
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}
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