Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / net / sctp / transport.c
diff --git a/kernel/net/sctp/transport.c b/kernel/net/sctp/transport.c
new file mode 100644 (file)
index 0000000..a0a4318
--- /dev/null
@@ -0,0 +1,656 @@
+/* SCTP kernel implementation
+ * Copyright (c) 1999-2000 Cisco, Inc.
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2001-2003 International Business Machines Corp.
+ * Copyright (c) 2001 Intel Corp.
+ * Copyright (c) 2001 La Monte H.P. Yarroll
+ *
+ * This file is part of the SCTP kernel implementation
+ *
+ * This module provides the abstraction for an SCTP tranport representing
+ * a remote transport address.  For local transport addresses, we just use
+ * union sctp_addr.
+ *
+ * This SCTP implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *                 ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ *    lksctp developers <linux-sctp@vger.kernel.org>
+ *
+ * Written or modified by:
+ *    La Monte H.P. Yarroll <piggy@acm.org>
+ *    Karl Knutson          <karl@athena.chicago.il.us>
+ *    Jon Grimm             <jgrimm@us.ibm.com>
+ *    Xingang Guo           <xingang.guo@intel.com>
+ *    Hui Huang             <hui.huang@nokia.com>
+ *    Sridhar Samudrala            <sri@us.ibm.com>
+ *    Ardelle Fan          <ardelle.fan@intel.com>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/random.h>
+#include <net/sctp/sctp.h>
+#include <net/sctp/sm.h>
+
+/* 1st Level Abstractions.  */
+
+/* Initialize a new transport from provided memory.  */
+static struct sctp_transport *sctp_transport_init(struct net *net,
+                                                 struct sctp_transport *peer,
+                                                 const union sctp_addr *addr,
+                                                 gfp_t gfp)
+{
+       /* Copy in the address.  */
+       peer->ipaddr = *addr;
+       peer->af_specific = sctp_get_af_specific(addr->sa.sa_family);
+       memset(&peer->saddr, 0, sizeof(union sctp_addr));
+
+       peer->sack_generation = 0;
+
+       /* From 6.3.1 RTO Calculation:
+        *
+        * C1) Until an RTT measurement has been made for a packet sent to the
+        * given destination transport address, set RTO to the protocol
+        * parameter 'RTO.Initial'.
+        */
+       peer->rto = msecs_to_jiffies(net->sctp.rto_initial);
+
+       peer->last_time_heard = ktime_get();
+       peer->last_time_ecne_reduced = jiffies;
+
+       peer->param_flags = SPP_HB_DISABLE |
+                           SPP_PMTUD_ENABLE |
+                           SPP_SACKDELAY_ENABLE;
+
+       /* Initialize the default path max_retrans.  */
+       peer->pathmaxrxt  = net->sctp.max_retrans_path;
+       peer->pf_retrans  = net->sctp.pf_retrans;
+
+       INIT_LIST_HEAD(&peer->transmitted);
+       INIT_LIST_HEAD(&peer->send_ready);
+       INIT_LIST_HEAD(&peer->transports);
+
+       setup_timer(&peer->T3_rtx_timer, sctp_generate_t3_rtx_event,
+                       (unsigned long)peer);
+       setup_timer(&peer->hb_timer, sctp_generate_heartbeat_event,
+                       (unsigned long)peer);
+       setup_timer(&peer->proto_unreach_timer,
+                   sctp_generate_proto_unreach_event, (unsigned long)peer);
+
+       /* Initialize the 64-bit random nonce sent with heartbeat. */
+       get_random_bytes(&peer->hb_nonce, sizeof(peer->hb_nonce));
+
+       atomic_set(&peer->refcnt, 1);
+
+       return peer;
+}
+
+/* Allocate and initialize a new transport.  */
+struct sctp_transport *sctp_transport_new(struct net *net,
+                                         const union sctp_addr *addr,
+                                         gfp_t gfp)
+{
+       struct sctp_transport *transport;
+
+       transport = kzalloc(sizeof(*transport), gfp);
+       if (!transport)
+               goto fail;
+
+       if (!sctp_transport_init(net, transport, addr, gfp))
+               goto fail_init;
+
+       SCTP_DBG_OBJCNT_INC(transport);
+
+       return transport;
+
+fail_init:
+       kfree(transport);
+
+fail:
+       return NULL;
+}
+
+/* This transport is no longer needed.  Free up if possible, or
+ * delay until it last reference count.
+ */
+void sctp_transport_free(struct sctp_transport *transport)
+{
+       transport->dead = 1;
+
+       /* Try to delete the heartbeat timer.  */
+       if (del_timer(&transport->hb_timer))
+               sctp_transport_put(transport);
+
+       /* Delete the T3_rtx timer if it's active.
+        * There is no point in not doing this now and letting
+        * structure hang around in memory since we know
+        * the tranport is going away.
+        */
+       if (del_timer(&transport->T3_rtx_timer))
+               sctp_transport_put(transport);
+
+       /* Delete the ICMP proto unreachable timer if it's active. */
+       if (del_timer(&transport->proto_unreach_timer))
+               sctp_association_put(transport->asoc);
+
+       sctp_transport_put(transport);
+}
+
+static void sctp_transport_destroy_rcu(struct rcu_head *head)
+{
+       struct sctp_transport *transport;
+
+       transport = container_of(head, struct sctp_transport, rcu);
+
+       dst_release(transport->dst);
+       kfree(transport);
+       SCTP_DBG_OBJCNT_DEC(transport);
+}
+
+/* Destroy the transport data structure.
+ * Assumes there are no more users of this structure.
+ */
+static void sctp_transport_destroy(struct sctp_transport *transport)
+{
+       if (unlikely(!transport->dead)) {
+               WARN(1, "Attempt to destroy undead transport %p!\n", transport);
+               return;
+       }
+
+       sctp_packet_free(&transport->packet);
+
+       if (transport->asoc)
+               sctp_association_put(transport->asoc);
+
+       call_rcu(&transport->rcu, sctp_transport_destroy_rcu);
+}
+
+/* Start T3_rtx timer if it is not already running and update the heartbeat
+ * timer.  This routine is called every time a DATA chunk is sent.
+ */
+void sctp_transport_reset_timers(struct sctp_transport *transport)
+{
+       /* RFC 2960 6.3.2 Retransmission Timer Rules
+        *
+        * R1) Every time a DATA chunk is sent to any address(including a
+        * retransmission), if the T3-rtx timer of that address is not running
+        * start it running so that it will expire after the RTO of that
+        * address.
+        */
+
+       if (!timer_pending(&transport->T3_rtx_timer))
+               if (!mod_timer(&transport->T3_rtx_timer,
+                              jiffies + transport->rto))
+                       sctp_transport_hold(transport);
+
+       /* When a data chunk is sent, reset the heartbeat interval.  */
+       if (!mod_timer(&transport->hb_timer,
+                      sctp_transport_timeout(transport)))
+           sctp_transport_hold(transport);
+}
+
+/* This transport has been assigned to an association.
+ * Initialize fields from the association or from the sock itself.
+ * Register the reference count in the association.
+ */
+void sctp_transport_set_owner(struct sctp_transport *transport,
+                             struct sctp_association *asoc)
+{
+       transport->asoc = asoc;
+       sctp_association_hold(asoc);
+}
+
+/* Initialize the pmtu of a transport. */
+void sctp_transport_pmtu(struct sctp_transport *transport, struct sock *sk)
+{
+       /* If we don't have a fresh route, look one up */
+       if (!transport->dst || transport->dst->obsolete) {
+               dst_release(transport->dst);
+               transport->af_specific->get_dst(transport, &transport->saddr,
+                                               &transport->fl, sk);
+       }
+
+       if (transport->dst) {
+               transport->pathmtu = dst_mtu(transport->dst);
+       } else
+               transport->pathmtu = SCTP_DEFAULT_MAXSEGMENT;
+}
+
+void sctp_transport_update_pmtu(struct sock *sk, struct sctp_transport *t, u32 pmtu)
+{
+       struct dst_entry *dst;
+
+       if (unlikely(pmtu < SCTP_DEFAULT_MINSEGMENT)) {
+               pr_warn("%s: Reported pmtu %d too low, using default minimum of %d\n",
+                       __func__, pmtu,
+                       SCTP_DEFAULT_MINSEGMENT);
+               /* Use default minimum segment size and disable
+                * pmtu discovery on this transport.
+                */
+               t->pathmtu = SCTP_DEFAULT_MINSEGMENT;
+       } else {
+               t->pathmtu = pmtu;
+       }
+
+       dst = sctp_transport_dst_check(t);
+       if (!dst)
+               t->af_specific->get_dst(t, &t->saddr, &t->fl, sk);
+
+       if (dst) {
+               dst->ops->update_pmtu(dst, sk, NULL, pmtu);
+
+               dst = sctp_transport_dst_check(t);
+               if (!dst)
+                       t->af_specific->get_dst(t, &t->saddr, &t->fl, sk);
+       }
+}
+
+/* Caches the dst entry and source address for a transport's destination
+ * address.
+ */
+void sctp_transport_route(struct sctp_transport *transport,
+                         union sctp_addr *saddr, struct sctp_sock *opt)
+{
+       struct sctp_association *asoc = transport->asoc;
+       struct sctp_af *af = transport->af_specific;
+
+       af->get_dst(transport, saddr, &transport->fl, sctp_opt2sk(opt));
+
+       if (saddr)
+               memcpy(&transport->saddr, saddr, sizeof(union sctp_addr));
+       else
+               af->get_saddr(opt, transport, &transport->fl);
+
+       if ((transport->param_flags & SPP_PMTUD_DISABLE) && transport->pathmtu) {
+               return;
+       }
+       if (transport->dst) {
+               transport->pathmtu = dst_mtu(transport->dst);
+
+               /* Initialize sk->sk_rcv_saddr, if the transport is the
+                * association's active path for getsockname().
+                */
+               if (asoc && (!asoc->peer.primary_path ||
+                               (transport == asoc->peer.active_path)))
+                       opt->pf->to_sk_saddr(&transport->saddr,
+                                            asoc->base.sk);
+       } else
+               transport->pathmtu = SCTP_DEFAULT_MAXSEGMENT;
+}
+
+/* Hold a reference to a transport.  */
+void sctp_transport_hold(struct sctp_transport *transport)
+{
+       atomic_inc(&transport->refcnt);
+}
+
+/* Release a reference to a transport and clean up
+ * if there are no more references.
+ */
+void sctp_transport_put(struct sctp_transport *transport)
+{
+       if (atomic_dec_and_test(&transport->refcnt))
+               sctp_transport_destroy(transport);
+}
+
+/* Update transport's RTO based on the newly calculated RTT. */
+void sctp_transport_update_rto(struct sctp_transport *tp, __u32 rtt)
+{
+       if (unlikely(!tp->rto_pending))
+               /* We should not be doing any RTO updates unless rto_pending is set.  */
+               pr_debug("%s: rto_pending not set on transport %p!\n", __func__, tp);
+
+       if (tp->rttvar || tp->srtt) {
+               struct net *net = sock_net(tp->asoc->base.sk);
+               /* 6.3.1 C3) When a new RTT measurement R' is made, set
+                * RTTVAR <- (1 - RTO.Beta) * RTTVAR + RTO.Beta * |SRTT - R'|
+                * SRTT <- (1 - RTO.Alpha) * SRTT + RTO.Alpha * R'
+                */
+
+               /* Note:  The above algorithm has been rewritten to
+                * express rto_beta and rto_alpha as inverse powers
+                * of two.
+                * For example, assuming the default value of RTO.Alpha of
+                * 1/8, rto_alpha would be expressed as 3.
+                */
+               tp->rttvar = tp->rttvar - (tp->rttvar >> net->sctp.rto_beta)
+                       + (((__u32)abs64((__s64)tp->srtt - (__s64)rtt)) >> net->sctp.rto_beta);
+               tp->srtt = tp->srtt - (tp->srtt >> net->sctp.rto_alpha)
+                       + (rtt >> net->sctp.rto_alpha);
+       } else {
+               /* 6.3.1 C2) When the first RTT measurement R is made, set
+                * SRTT <- R, RTTVAR <- R/2.
+                */
+               tp->srtt = rtt;
+               tp->rttvar = rtt >> 1;
+       }
+
+       /* 6.3.1 G1) Whenever RTTVAR is computed, if RTTVAR = 0, then
+        * adjust RTTVAR <- G, where G is the CLOCK GRANULARITY.
+        */
+       if (tp->rttvar == 0)
+               tp->rttvar = SCTP_CLOCK_GRANULARITY;
+
+       /* 6.3.1 C3) After the computation, update RTO <- SRTT + 4 * RTTVAR. */
+       tp->rto = tp->srtt + (tp->rttvar << 2);
+
+       /* 6.3.1 C6) Whenever RTO is computed, if it is less than RTO.Min
+        * seconds then it is rounded up to RTO.Min seconds.
+        */
+       if (tp->rto < tp->asoc->rto_min)
+               tp->rto = tp->asoc->rto_min;
+
+       /* 6.3.1 C7) A maximum value may be placed on RTO provided it is
+        * at least RTO.max seconds.
+        */
+       if (tp->rto > tp->asoc->rto_max)
+               tp->rto = tp->asoc->rto_max;
+
+       sctp_max_rto(tp->asoc, tp);
+       tp->rtt = rtt;
+
+       /* Reset rto_pending so that a new RTT measurement is started when a
+        * new data chunk is sent.
+        */
+       tp->rto_pending = 0;
+
+       pr_debug("%s: transport:%p, rtt:%d, srtt:%d rttvar:%d, rto:%ld\n",
+                __func__, tp, rtt, tp->srtt, tp->rttvar, tp->rto);
+}
+
+/* This routine updates the transport's cwnd and partial_bytes_acked
+ * parameters based on the bytes acked in the received SACK.
+ */
+void sctp_transport_raise_cwnd(struct sctp_transport *transport,
+                              __u32 sack_ctsn, __u32 bytes_acked)
+{
+       struct sctp_association *asoc = transport->asoc;
+       __u32 cwnd, ssthresh, flight_size, pba, pmtu;
+
+       cwnd = transport->cwnd;
+       flight_size = transport->flight_size;
+
+       /* See if we need to exit Fast Recovery first */
+       if (asoc->fast_recovery &&
+           TSN_lte(asoc->fast_recovery_exit, sack_ctsn))
+               asoc->fast_recovery = 0;
+
+       /* The appropriate cwnd increase algorithm is performed if, and only
+        * if the cumulative TSN whould advanced and the congestion window is
+        * being fully utilized.
+        */
+       if (TSN_lte(sack_ctsn, transport->asoc->ctsn_ack_point) ||
+           (flight_size < cwnd))
+               return;
+
+       ssthresh = transport->ssthresh;
+       pba = transport->partial_bytes_acked;
+       pmtu = transport->asoc->pathmtu;
+
+       if (cwnd <= ssthresh) {
+               /* RFC 4960 7.2.1
+                * o  When cwnd is less than or equal to ssthresh, an SCTP
+                *    endpoint MUST use the slow-start algorithm to increase
+                *    cwnd only if the current congestion window is being fully
+                *    utilized, an incoming SACK advances the Cumulative TSN
+                *    Ack Point, and the data sender is not in Fast Recovery.
+                *    Only when these three conditions are met can the cwnd be
+                *    increased; otherwise, the cwnd MUST not be increased.
+                *    If these conditions are met, then cwnd MUST be increased
+                *    by, at most, the lesser of 1) the total size of the
+                *    previously outstanding DATA chunk(s) acknowledged, and
+                *    2) the destination's path MTU.  This upper bound protects
+                *    against the ACK-Splitting attack outlined in [SAVAGE99].
+                */
+               if (asoc->fast_recovery)
+                       return;
+
+               if (bytes_acked > pmtu)
+                       cwnd += pmtu;
+               else
+                       cwnd += bytes_acked;
+
+               pr_debug("%s: slow start: transport:%p, bytes_acked:%d, "
+                        "cwnd:%d, ssthresh:%d, flight_size:%d, pba:%d\n",
+                        __func__, transport, bytes_acked, cwnd, ssthresh,
+                        flight_size, pba);
+       } else {
+               /* RFC 2960 7.2.2 Whenever cwnd is greater than ssthresh,
+                * upon each SACK arrival that advances the Cumulative TSN Ack
+                * Point, increase partial_bytes_acked by the total number of
+                * bytes of all new chunks acknowledged in that SACK including
+                * chunks acknowledged by the new Cumulative TSN Ack and by
+                * Gap Ack Blocks.
+                *
+                * When partial_bytes_acked is equal to or greater than cwnd
+                * and before the arrival of the SACK the sender had cwnd or
+                * more bytes of data outstanding (i.e., before arrival of the
+                * SACK, flightsize was greater than or equal to cwnd),
+                * increase cwnd by MTU, and reset partial_bytes_acked to
+                * (partial_bytes_acked - cwnd).
+                */
+               pba += bytes_acked;
+               if (pba >= cwnd) {
+                       cwnd += pmtu;
+                       pba = ((cwnd < pba) ? (pba - cwnd) : 0);
+               }
+
+               pr_debug("%s: congestion avoidance: transport:%p, "
+                        "bytes_acked:%d, cwnd:%d, ssthresh:%d, "
+                        "flight_size:%d, pba:%d\n", __func__,
+                        transport, bytes_acked, cwnd, ssthresh,
+                        flight_size, pba);
+       }
+
+       transport->cwnd = cwnd;
+       transport->partial_bytes_acked = pba;
+}
+
+/* This routine is used to lower the transport's cwnd when congestion is
+ * detected.
+ */
+void sctp_transport_lower_cwnd(struct sctp_transport *transport,
+                              sctp_lower_cwnd_t reason)
+{
+       struct sctp_association *asoc = transport->asoc;
+
+       switch (reason) {
+       case SCTP_LOWER_CWND_T3_RTX:
+               /* RFC 2960 Section 7.2.3, sctpimpguide
+                * When the T3-rtx timer expires on an address, SCTP should
+                * perform slow start by:
+                *      ssthresh = max(cwnd/2, 4*MTU)
+                *      cwnd = 1*MTU
+                *      partial_bytes_acked = 0
+                */
+               transport->ssthresh = max(transport->cwnd/2,
+                                         4*asoc->pathmtu);
+               transport->cwnd = asoc->pathmtu;
+
+               /* T3-rtx also clears fast recovery */
+               asoc->fast_recovery = 0;
+               break;
+
+       case SCTP_LOWER_CWND_FAST_RTX:
+               /* RFC 2960 7.2.4 Adjust the ssthresh and cwnd of the
+                * 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
+                * losses from SACK (see Section 7.2.4), An endpoint
+                * should do the following:
+                *      ssthresh = max(cwnd/2, 4*MTU)
+                *      cwnd = ssthresh
+                *      partial_bytes_acked = 0
+                */
+               if (asoc->fast_recovery)
+                       return;
+
+               /* Mark Fast recovery */
+               asoc->fast_recovery = 1;
+               asoc->fast_recovery_exit = asoc->next_tsn - 1;
+
+               transport->ssthresh = max(transport->cwnd/2,
+                                         4*asoc->pathmtu);
+               transport->cwnd = transport->ssthresh;
+               break;
+
+       case SCTP_LOWER_CWND_ECNE:
+               /* RFC 2481 Section 6.1.2.
+                * If the sender receives an ECN-Echo ACK packet
+                * then the sender knows that congestion was encountered in the
+                * network on the path from the sender to the receiver. The
+                * indication of congestion should be treated just as a
+                * congestion loss in non-ECN Capable TCP. That is, the TCP
+                * source halves the congestion window "cwnd" and reduces the
+                * slow start threshold "ssthresh".
+                * A critical condition is that TCP does not react to
+                * congestion indications more than once every window of
+                * data (or more loosely more than once every round-trip time).
+                */
+               if (time_after(jiffies, transport->last_time_ecne_reduced +
+                                       transport->rtt)) {
+                       transport->ssthresh = max(transport->cwnd/2,
+                                                 4*asoc->pathmtu);
+                       transport->cwnd = transport->ssthresh;
+                       transport->last_time_ecne_reduced = jiffies;
+               }
+               break;
+
+       case SCTP_LOWER_CWND_INACTIVE:
+               /* RFC 2960 Section 7.2.1, sctpimpguide
+                * When the endpoint does not transmit data on a given
+                * transport address, the cwnd of the transport address
+                * should be adjusted to max(cwnd/2, 4*MTU) per RTO.
+                * NOTE: Although the draft recommends that this check needs
+                * to be done every RTO interval, we do it every hearbeat
+                * interval.
+                */
+               transport->cwnd = max(transport->cwnd/2,
+                                        4*asoc->pathmtu);
+               break;
+       }
+
+       transport->partial_bytes_acked = 0;
+
+       pr_debug("%s: transport:%p, reason:%d, cwnd:%d, ssthresh:%d\n",
+                __func__, transport, reason, transport->cwnd,
+                transport->ssthresh);
+}
+
+/* Apply Max.Burst limit to the congestion window:
+ * sctpimpguide-05 2.14.2
+ * D) When the time comes for the sender to
+ * transmit new DATA chunks, the protocol parameter Max.Burst MUST
+ * first be applied to limit how many new DATA chunks may be sent.
+ * The limit is applied by adjusting cwnd as follows:
+ *     if ((flightsize+ Max.Burst * MTU) < cwnd)
+ *             cwnd = flightsize + Max.Burst * MTU
+ */
+
+void sctp_transport_burst_limited(struct sctp_transport *t)
+{
+       struct sctp_association *asoc = t->asoc;
+       u32 old_cwnd = t->cwnd;
+       u32 max_burst_bytes;
+
+       if (t->burst_limited || asoc->max_burst == 0)
+               return;
+
+       max_burst_bytes = t->flight_size + (asoc->max_burst * asoc->pathmtu);
+       if (max_burst_bytes < old_cwnd) {
+               t->cwnd = max_burst_bytes;
+               t->burst_limited = old_cwnd;
+       }
+}
+
+/* Restore the old cwnd congestion window, after the burst had it's
+ * desired effect.
+ */
+void sctp_transport_burst_reset(struct sctp_transport *t)
+{
+       if (t->burst_limited) {
+               t->cwnd = t->burst_limited;
+               t->burst_limited = 0;
+       }
+}
+
+/* What is the next timeout value for this transport? */
+unsigned long sctp_transport_timeout(struct sctp_transport *trans)
+{
+       /* RTO + timer slack +/- 50% of RTO */
+       unsigned long timeout = (trans->rto >> 1) + prandom_u32_max(trans->rto);
+
+       if (trans->state != SCTP_UNCONFIRMED &&
+           trans->state != SCTP_PF)
+               timeout += trans->hbinterval;
+
+       return timeout + jiffies;
+}
+
+/* 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->burst_limited = 0;
+       t->ssthresh = asoc->peer.i.a_rwnd;
+       t->rto = asoc->rto_initial;
+       sctp_max_rto(asoc, t);
+       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;
+       t->hb_sent = 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;
+}
+
+/* Schedule retransmission on the given transport */
+void sctp_transport_immediate_rtx(struct sctp_transport *t)
+{
+       /* Stop pending T3_rtx_timer */
+       if (del_timer(&t->T3_rtx_timer))
+               sctp_transport_put(t);
+
+       sctp_retransmit(&t->asoc->outqueue, t, SCTP_RTXR_T3_RTX);
+       if (!timer_pending(&t->T3_rtx_timer)) {
+               if (!mod_timer(&t->T3_rtx_timer, jiffies + t->rto))
+                       sctp_transport_hold(t);
+       }
+}