struct sctp_transport *sctp_transport_new(const union sctp_addr *addr,
gfp_t gfp)
{
- struct sctp_transport *transport;
+ struct sctp_transport *transport;
- transport = t_new(struct sctp_transport, gfp);
+ transport = t_new(struct sctp_transport, gfp);
if (!transport)
goto fail;
if (transport->asoc)
sctp_association_put(transport->asoc);
- sctp_packet_free(&transport->packet);
+ sctp_packet_free(&transport->packet);
dst_release(transport->dst);
kfree(transport);
transport->pathmtu = SCTP_DEFAULT_MAXSEGMENT;
}
+/* this is a complete rip-off from __sk_dst_check
+ * the cookie is always 0 since this is how it's used in the
+ * pmtu code
+ */
+static struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
+{
+ struct dst_entry *dst = t->dst;
+
+ if (dst && dst->obsolete && dst->ops->check(dst, 0) == NULL) {
+ dst_release(t->dst);
+ t->dst = NULL;
+ return NULL;
+ }
+
+ return dst;
+}
+
+void sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu)
+{
+ struct dst_entry *dst;
+
+ if (unlikely(pmtu < SCTP_DEFAULT_MINSEGMENT)) {
+ printk(KERN_WARNING "%s: Reported pmtu %d too low, "
+ "using default minimum of %d\n",
+ __FUNCTION__, pmtu,
+ SCTP_DEFAULT_MINSEGMENT);
+ /* Use default minimum segment size and disable
+ * pmtu discovery on this transport.
+ */
+ t->pathmtu = SCTP_DEFAULT_MINSEGMENT;
+ t->param_flags = (t->param_flags & ~SPP_PMTUD) |
+ SPP_PMTUD_DISABLE;
+ } else {
+ t->pathmtu = pmtu;
+ }
+
+ dst = sctp_transport_dst_check(t);
+ if (dst)
+ dst->ops->update_pmtu(dst, pmtu);
+}
+
/* Caches the dst entry and source address for a transport's destination
* address.
*/
/* Initialize sk->sk_rcv_saddr, if the transport is the
* association's active path for getsockname().
- */
+ */
if (asoc && (transport == asoc->peer.active_path))
opt->pf->af->to_sk_saddr(&transport->saddr,
asoc->base.sk);
* destination address(es) to which the missing DATA chunks
* were last sent, according to the formula described in
* Section 7.2.3.
- *
- * RFC 2960 7.2.3, sctpimpguide Upon detection of packet
+ *
+ * RFC 2960 7.2.3, sctpimpguide Upon detection of packet
* losses from SACK (see Section 7.2.4), An endpoint
* should do the following:
* ssthresh = max(cwnd/2, 4*MTU)
if ((jiffies - transport->last_time_ecne_reduced) >
transport->rtt) {
transport->ssthresh = max(transport->cwnd/2,
- 4*transport->asoc->pathmtu);
+ 4*transport->asoc->pathmtu);
transport->cwnd = transport->ssthresh;
transport->last_time_ecne_reduced = jiffies;
}
transport->cwnd = max(transport->cwnd/2,
4*transport->asoc->pathmtu);
break;
- };
+ }
transport->partial_bytes_acked = 0;
SCTP_DEBUG_PRINTK("%s: transport: %p reason: %d cwnd: "
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 = asoc->peer.i.a_rwnd;
+ 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;
+}