[SCTP]: Update SCTP_PEER_ADDR_PARAMS socket option to the latest api draft.
This patch adds support to set/get heartbeat interval, maximum number of
retransmissions, pathmtu, sackdelay time for a particular transport/
association/socket as per the latest SCTP sockets api draft11.
Signed-off-by: Frank Filz <ffilz@us.ibm.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 8e7794ee..f5c22d7 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -277,6 +277,24 @@
__u32 default_context;
__u32 default_timetolive;
+ /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
+ * the destination address every heartbeat interval. This value
+ * will be inherited by all new associations.
+ */
+ __u32 hbinterval;
+
+ /* This is the max_retrans value for new associations. */
+ __u16 pathmaxrxt;
+
+ /* The initial Path MTU to use for new associations. */
+ __u32 pathmtu;
+
+ /* The default SACK delay timeout for new associations. */
+ __u32 sackdelay;
+
+ /* Flags controling Heartbeat, SACK delay, and Path MTU Discovery. */
+ __u32 param_flags;
+
struct sctp_initmsg initmsg;
struct sctp_rtoinfo rtoinfo;
struct sctp_paddrparams paddrparam;
@@ -845,9 +863,6 @@
/* Data that has been sent, but not acknowledged. */
__u32 flight_size;
- /* PMTU : The current known path MTU. */
- __u32 pmtu;
-
/* Destination */
struct dst_entry *dst;
/* Source address. */
@@ -862,7 +877,22 @@
/* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
* the destination address every heartbeat interval.
*/
- int hb_interval;
+ __u32 hbinterval;
+
+ /* This is the max_retrans value for the transport and will
+ * be initialized from the assocs value. This can be changed
+ * using SCTP_SET_PEER_ADDR_PARAMS socket option.
+ */
+ __u16 pathmaxrxt;
+
+ /* PMTU : The current known path MTU. */
+ __u32 pathmtu;
+
+ /* SACK delay timeout */
+ __u32 sackdelay;
+
+ /* Flags controling Heartbeat, SACK delay, and Path MTU Discovery. */
+ __u32 param_flags;
/* When was the last time (in jiffies) that we heard from this
* transport? We use this to pick new active and retran paths.
@@ -882,22 +912,11 @@
*/
int state;
- /* hb_allowed : The current heartbeat state of this destination,
- * : i.e. ALLOW-HB, NO-HEARTBEAT, etc.
- */
- int hb_allowed;
-
/* These are the error stats for this destination. */
/* Error count : The current error count for this destination. */
unsigned short error_count;
- /* This is the max_retrans value for the transport and will
- * be initialized to proto.max_retrans.path. This can be changed
- * using SCTP_SET_PEER_ADDR_PARAMS socket option.
- */
- int max_retrans;
-
/* Per : A timer used by each destination.
* Destination :
* Timer :
@@ -1502,6 +1521,28 @@
/* The largest timeout or RTO value to use in attempting an INIT */
__u16 max_init_timeo;
+ /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
+ * the destination address every heartbeat interval. This value
+ * will be inherited by all new transports.
+ */
+ __u32 hbinterval;
+
+ /* This is the max_retrans value for new transports in the
+ * association.
+ */
+ __u16 pathmaxrxt;
+
+ /* Association : The smallest PMTU discovered for all of the
+ * PMTU : peer's transport addresses.
+ */
+ __u32 pathmtu;
+
+ /* SACK delay timeout */
+ __u32 sackdelay;
+
+ /* Flags controling Heartbeat, SACK delay, and Path MTU Discovery. */
+ __u32 param_flags;
+
int timeouts[SCTP_NUM_TIMEOUT_TYPES];
struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES];
@@ -1571,11 +1612,6 @@
*/
wait_queue_head_t wait;
- /* Association : The smallest PMTU discovered for all of the
- * PMTU : peer's transport addresses.
- */
- __u32 pmtu;
-
/* The message size at which SCTP fragmentation will occur. */
__u32 frag_point;
diff --git a/include/net/sctp/user.h b/include/net/sctp/user.h
index f1c3bc5..b9052864 100644
--- a/include/net/sctp/user.h
+++ b/include/net/sctp/user.h
@@ -503,11 +503,27 @@
* unreachable. The following structure is used to access and modify an
* address's parameters:
*/
+enum sctp_spp_flags {
+ SPP_HB_ENABLE = 1, /*Enable heartbeats*/
+ SPP_HB_DISABLE = 2, /*Disable heartbeats*/
+ SPP_HB = SPP_HB_ENABLE | SPP_HB_DISABLE,
+ SPP_HB_DEMAND = 4, /*Send heartbeat immediately*/
+ SPP_PMTUD_ENABLE = 8, /*Enable PMTU discovery*/
+ SPP_PMTUD_DISABLE = 16, /*Disable PMTU discovery*/
+ SPP_PMTUD = SPP_PMTUD_ENABLE | SPP_PMTUD_DISABLE,
+ SPP_SACKDELAY_ENABLE = 32, /*Enable SACK*/
+ SPP_SACKDELAY_DISABLE = 64, /*Disable SACK*/
+ SPP_SACKDELAY = SPP_SACKDELAY_ENABLE | SPP_SACKDELAY_DISABLE,
+};
+
struct sctp_paddrparams {
sctp_assoc_t spp_assoc_id;
struct sockaddr_storage spp_address;
__u32 spp_hbinterval;
__u16 spp_pathmaxrxt;
+ __u32 spp_pathmtu;
+ __u32 spp_sackdelay;
+ __u32 spp_flags;
} __attribute__((packed, aligned(4)));
/*
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index dec68a6..9d05e13 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -110,7 +110,6 @@
asoc->cookie_life.tv_sec = sp->assocparams.sasoc_cookie_life / 1000;
asoc->cookie_life.tv_usec = (sp->assocparams.sasoc_cookie_life % 1000)
* 1000;
- asoc->pmtu = 0;
asoc->frag_point = 0;
/* Set the association max_retrans and RTO values from the
@@ -123,6 +122,25 @@
asoc->overall_error_count = 0;
+ /* Initialize the association's heartbeat interval based on the
+ * sock configured value.
+ */
+ asoc->hbinterval = msecs_to_jiffies(sp->hbinterval);
+
+ /* Initialize path max retrans value. */
+ asoc->pathmaxrxt = sp->pathmaxrxt;
+
+ /* Initialize default path MTU. */
+ asoc->pathmtu = sp->pathmtu;
+
+ /* Set association default SACK delay */
+ asoc->sackdelay = msecs_to_jiffies(sp->sackdelay);
+
+ /* Set the association default flags controlling
+ * Heartbeat, SACK delay, and Path MTU Discovery.
+ */
+ asoc->param_flags = sp->param_flags;
+
/* Initialize the maximum mumber of new data packets that can be sent
* in a burst.
*/
@@ -144,8 +162,7 @@
= 5 * asoc->rto_max;
asoc->timeouts[SCTP_EVENT_TIMEOUT_HEARTBEAT] = 0;
- asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
- SCTP_DEFAULT_TIMEOUT_SACK;
+ asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = asoc->sackdelay;
asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE] =
sp->autoclose * HZ;
@@ -540,23 +557,46 @@
sctp_transport_set_owner(peer, asoc);
+ /* Initialize the peer's heartbeat interval based on the
+ * association configured value.
+ */
+ peer->hbinterval = asoc->hbinterval;
+
+ /* Set the path max_retrans. */
+ peer->pathmaxrxt = asoc->pathmaxrxt;
+
+ /* Initialize the peer's SACK delay timeout based on the
+ * association configured value.
+ */
+ peer->sackdelay = asoc->sackdelay;
+
+ /* Enable/disable heartbeat, SACK delay, and path MTU discovery
+ * based on association setting.
+ */
+ peer->param_flags = asoc->param_flags;
+
/* Initialize the pmtu of the transport. */
- sctp_transport_pmtu(peer);
+ if (peer->param_flags & SPP_PMTUD_ENABLE)
+ sctp_transport_pmtu(peer);
+ else if (asoc->pathmtu)
+ peer->pathmtu = asoc->pathmtu;
+ else
+ peer->pathmtu = SCTP_DEFAULT_MAXSEGMENT;
/* If this is the first transport addr on this association,
* initialize the association PMTU to the peer's PMTU.
* If not and the current association PMTU is higher than the new
* peer's PMTU, reset the association PMTU to the new peer's PMTU.
*/
- if (asoc->pmtu)
- asoc->pmtu = min_t(int, peer->pmtu, asoc->pmtu);
+ if (asoc->pathmtu)
+ asoc->pathmtu = min_t(int, peer->pathmtu, asoc->pathmtu);
else
- asoc->pmtu = peer->pmtu;
+ asoc->pathmtu = peer->pathmtu;
SCTP_DEBUG_PRINTK("sctp_assoc_add_peer:association %p PMTU set to "
- "%d\n", asoc, asoc->pmtu);
+ "%d\n", asoc, asoc->pathmtu);
- asoc->frag_point = sctp_frag_point(sp, asoc->pmtu);
+ asoc->frag_point = sctp_frag_point(sp, asoc->pathmtu);
/* The asoc->peer.port might not be meaningful yet, but
* initialize the packet structure anyway.
@@ -574,7 +614,7 @@
* (for example, implementations MAY use the size of the
* receiver advertised window).
*/
- peer->cwnd = min(4*asoc->pmtu, max_t(__u32, 2*asoc->pmtu, 4380));
+ peer->cwnd = min(4*asoc->pathmtu, max_t(__u32, 2*asoc->pathmtu, 4380));
/* At this point, we may not have the receiver's advertised window,
* so initialize ssthresh to the default value and it will be set
@@ -585,17 +625,6 @@
peer->partial_bytes_acked = 0;
peer->flight_size = 0;
- /* By default, enable heartbeat for peer address. */
- peer->hb_allowed = 1;
-
- /* Initialize the peer's heartbeat interval based on the
- * sock configured value.
- */
- peer->hb_interval = msecs_to_jiffies(sp->paddrparam.spp_hbinterval);
-
- /* Set the path max_retrans. */
- peer->max_retrans = sp->paddrparam.spp_pathmaxrxt;
-
/* Set the transport's RTO.initial value */
peer->rto = asoc->rto_initial;
@@ -1155,18 +1184,18 @@
/* Get the lowest pmtu of all the transports. */
list_for_each(pos, &asoc->peer.transport_addr_list) {
t = list_entry(pos, struct sctp_transport, transports);
- if (!pmtu || (t->pmtu < pmtu))
- pmtu = t->pmtu;
+ if (!pmtu || (t->pathmtu < pmtu))
+ pmtu = t->pathmtu;
}
if (pmtu) {
struct sctp_sock *sp = sctp_sk(asoc->base.sk);
- asoc->pmtu = pmtu;
+ asoc->pathmtu = pmtu;
asoc->frag_point = sctp_frag_point(sp, pmtu);
}
SCTP_DEBUG_PRINTK("%s: asoc:%p, pmtu:%d, frag_point:%d\n",
- __FUNCTION__, asoc, asoc->pmtu, asoc->frag_point);
+ __FUNCTION__, asoc, asoc->pathmtu, asoc->frag_point);
}
/* Should we send a SACK to update our peer? */
@@ -1179,7 +1208,7 @@
case SCTP_STATE_SHUTDOWN_SENT:
if ((asoc->rwnd > asoc->a_rwnd) &&
((asoc->rwnd - asoc->a_rwnd) >=
- min_t(__u32, (asoc->base.sk->sk_rcvbuf >> 1), asoc->pmtu)))
+ min_t(__u32, (asoc->base.sk->sk_rcvbuf >> 1), asoc->pathmtu)))
return 1;
break;
default:
diff --git a/net/sctp/input.c b/net/sctp/input.c
index b24ff2c..238f1bf 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -305,18 +305,36 @@
void sctp_icmp_frag_needed(struct sock *sk, struct sctp_association *asoc,
struct sctp_transport *t, __u32 pmtu)
{
- 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);
- pmtu = SCTP_DEFAULT_MINSEGMENT;
+ if (sock_owned_by_user(sk) || !t || (t->pathmtu == pmtu))
+ return;
+
+ if (t->param_flags & SPP_PMTUD_ENABLE) {
+ 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_HB) |
+ SPP_PMTUD_DISABLE;
+ } else {
+ t->pathmtu = pmtu;
+ }
+
+ /* Update association pmtu. */
+ sctp_assoc_sync_pmtu(asoc);
}
- if (!sock_owned_by_user(sk) && t && (t->pmtu != pmtu)) {
- t->pmtu = pmtu;
- sctp_assoc_sync_pmtu(asoc);
- sctp_retransmit(&asoc->outqueue, t, SCTP_RTXR_PMTUD);
- }
+ /* Retransmit with the new pmtu setting.
+ * Normally, if PMTU discovery is disabled, an ICMP Fragmentation
+ * Needed will never be sent, but if a message was sent before
+ * PMTU discovery was disabled that was larger than the PMTU, it
+ * would not be fragmented, so it must be re-transmitted fragmented.
+ */
+ sctp_retransmit(&asoc->outqueue, t, SCTP_RTXR_PMTUD);
}
/*
diff --git a/net/sctp/output.c b/net/sctp/output.c
index 9313716..a40991e 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -234,8 +234,8 @@
goto finish;
pmtu = ((packet->transport->asoc) ?
- (packet->transport->asoc->pmtu) :
- (packet->transport->pmtu));
+ (packet->transport->asoc->pathmtu) :
+ (packet->transport->pathmtu));
too_big = (psize + chunk_len > pmtu);
@@ -482,7 +482,9 @@
if (!dst || (dst->obsolete > 1)) {
dst_release(dst);
sctp_transport_route(tp, NULL, sctp_sk(sk));
- sctp_assoc_sync_pmtu(asoc);
+ if (asoc->param_flags & SPP_PMTUD_ENABLE) {
+ sctp_assoc_sync_pmtu(asoc);
+ }
}
nskb->dst = dst_clone(tp->dst);
@@ -492,7 +494,10 @@
SCTP_DEBUG_PRINTK("***sctp_transmit_packet*** skb len %d\n",
nskb->len);
- (*tp->af_specific->sctp_xmit)(nskb, tp, packet->ipfragok);
+ if (tp->param_flags & SPP_PMTUD_ENABLE)
+ (*tp->af_specific->sctp_xmit)(nskb, tp, packet->ipfragok);
+ else
+ (*tp->af_specific->sctp_xmit)(nskb, tp, 1);
out:
packet->size = packet->overhead;
@@ -577,7 +582,7 @@
* if ((flightsize + Max.Burst * MTU) < cwnd)
* cwnd = flightsize + Max.Burst * MTU
*/
- max_burst_bytes = asoc->max_burst * asoc->pmtu;
+ max_burst_bytes = asoc->max_burst * asoc->pathmtu;
if ((transport->flight_size + max_burst_bytes) < transport->cwnd) {
transport->cwnd = transport->flight_size + max_burst_bytes;
SCTP_DEBUG_PRINTK("%s: cwnd limited by max_burst: "
@@ -622,7 +627,7 @@
* data will fit or delay in hopes of bundling a full
* sized packet.
*/
- if (len < asoc->pmtu - packet->overhead) {
+ if (len < asoc->pathmtu - packet->overhead) {
retval = SCTP_XMIT_NAGLE_DELAY;
goto finish;
}
diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index 8239471..2d7d8a5 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -157,9 +157,12 @@
{
__u32 ctsn, max_tsn_seen;
struct sctp_chunk *sack;
+ struct sctp_transport *trans = asoc->peer.last_data_from;
int error = 0;
- if (force)
+ if (force ||
+ (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) ||
+ (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE)))
asoc->peer.sack_needed = 1;
ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
@@ -189,7 +192,22 @@
if (!asoc->peer.sack_needed) {
/* We will need a SACK for the next packet. */
asoc->peer.sack_needed = 1;
- goto out;
+
+ /* Set the SACK delay timeout based on the
+ * SACK delay for the last transport
+ * data was received from, or the default
+ * for the association.
+ */
+ if (trans)
+ asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
+ trans->sackdelay;
+ else
+ asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
+ asoc->sackdelay;
+
+ /* Restart the SACK timer. */
+ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
+ SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
} else {
if (asoc->a_rwnd > asoc->rwnd)
asoc->a_rwnd = asoc->rwnd;
@@ -205,7 +223,7 @@
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
}
-out:
+
return error;
nomem:
error = -ENOMEM;
@@ -415,7 +433,7 @@
asoc->overall_error_count++;
if (transport->state != SCTP_INACTIVE &&
- (transport->error_count++ >= transport->max_retrans)) {
+ (transport->error_count++ >= transport->pathmaxrxt)) {
SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
" transport IP: port:%d failed.\n",
asoc,
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 475bfb4..557a7d9 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -900,7 +900,7 @@
* HEARTBEAT is sent (see Section 8.3).
*/
- if (transport->hb_allowed) {
+ if (transport->param_flags & SPP_HB_ENABLE) {
if (SCTP_DISPOSITION_NOMEM ==
sctp_sf_heartbeat(ep, asoc, type, arg,
commands))
@@ -1051,7 +1051,7 @@
return SCTP_DISPOSITION_DISCARD;
}
- max_interval = link->hb_interval + link->rto;
+ max_interval = link->hbinterval + link->rto;
/* Check if the timestamp looks valid. */
if (time_after(hbinfo->sent_at, jiffies) ||
@@ -2691,14 +2691,9 @@
* document allow. However, an SCTP transmitter MUST NOT be
* more aggressive than the following algorithms allow.
*/
- if (chunk->end_of_packet) {
+ if (chunk->end_of_packet)
sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_NOFORCE());
- /* Start the SACK timer. */
- sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
- SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
- }
-
return SCTP_DISPOSITION_CONSUME;
discard_force:
@@ -2721,13 +2716,9 @@
return SCTP_DISPOSITION_DISCARD;
discard_noforce:
- if (chunk->end_of_packet) {
+ if (chunk->end_of_packet)
sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_NOFORCE());
- /* Start the SACK timer. */
- sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
- SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
- }
return SCTP_DISPOSITION_DISCARD;
consume:
return SCTP_DISPOSITION_CONSUME;
@@ -3442,9 +3433,6 @@
* send another.
*/
sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_NOFORCE());
- /* Start the SACK timer. */
- sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
- SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
return SCTP_DISPOSITION_CONSUME;
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 9df888e..adb5ee6 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -1941,106 +1941,275 @@
* address's parameters:
*
* struct sctp_paddrparams {
- * sctp_assoc_t spp_assoc_id;
- * struct sockaddr_storage spp_address;
- * uint32_t spp_hbinterval;
- * uint16_t spp_pathmaxrxt;
- * };
+ * sctp_assoc_t spp_assoc_id;
+ * struct sockaddr_storage spp_address;
+ * uint32_t spp_hbinterval;
+ * uint16_t spp_pathmaxrxt;
+ * uint32_t spp_pathmtu;
+ * uint32_t spp_sackdelay;
+ * uint32_t spp_flags;
+ * };
*
- * spp_assoc_id - (UDP style socket) This is filled in the application,
- * and identifies the association for this query.
+ * spp_assoc_id - (one-to-many style socket) This is filled in the
+ * application, and identifies the association for
+ * this query.
* spp_address - This specifies which address is of interest.
* spp_hbinterval - This contains the value of the heartbeat interval,
- * in milliseconds. A value of 0, when modifying the
- * parameter, specifies that the heartbeat on this
- * address should be disabled. A value of UINT32_MAX
- * (4294967295), when modifying the parameter,
- * specifies that a heartbeat should be sent
- * immediately to the peer address, and the current
- * interval should remain unchanged.
+ * in milliseconds. If a value of zero
+ * is present in this field then no changes are to
+ * be made to this parameter.
* spp_pathmaxrxt - This contains the maximum number of
* retransmissions before this address shall be
- * considered unreachable.
+ * considered unreachable. If a value of zero
+ * is present in this field then no changes are to
+ * be made to this parameter.
+ * spp_pathmtu - When Path MTU discovery is disabled the value
+ * specified here will be the "fixed" path mtu.
+ * Note that if the spp_address field is empty
+ * then all associations on this address will
+ * have this fixed path mtu set upon them.
+ *
+ * spp_sackdelay - When delayed sack is enabled, this value specifies
+ * the number of milliseconds that sacks will be delayed
+ * for. This value will apply to all addresses of an
+ * association if the spp_address field is empty. Note
+ * also, that if delayed sack is enabled and this
+ * value is set to 0, no change is made to the last
+ * recorded delayed sack timer value.
+ *
+ * spp_flags - These flags are used to control various features
+ * on an association. The flag field may contain
+ * zero or more of the following options.
+ *
+ * SPP_HB_ENABLE - Enable heartbeats on the
+ * specified address. Note that if the address
+ * field is empty all addresses for the association
+ * have heartbeats enabled upon them.
+ *
+ * SPP_HB_DISABLE - Disable heartbeats on the
+ * speicifed address. Note that if the address
+ * field is empty all addresses for the association
+ * will have their heartbeats disabled. Note also
+ * that SPP_HB_ENABLE and SPP_HB_DISABLE are
+ * mutually exclusive, only one of these two should
+ * be specified. Enabling both fields will have
+ * undetermined results.
+ *
+ * SPP_HB_DEMAND - Request a user initiated heartbeat
+ * to be made immediately.
+ *
+ * SPP_PMTUD_ENABLE - This field will enable PMTU
+ * discovery upon the specified address. Note that
+ * if the address feild is empty then all addresses
+ * on the association are effected.
+ *
+ * SPP_PMTUD_DISABLE - This field will disable PMTU
+ * discovery upon the specified address. Note that
+ * if the address feild is empty then all addresses
+ * on the association are effected. Not also that
+ * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
+ * exclusive. Enabling both will have undetermined
+ * results.
+ *
+ * SPP_SACKDELAY_ENABLE - Setting this flag turns
+ * on delayed sack. The time specified in spp_sackdelay
+ * is used to specify the sack delay for this address. Note
+ * that if spp_address is empty then all addresses will
+ * enable delayed sack and take on the sack delay
+ * value specified in spp_sackdelay.
+ * SPP_SACKDELAY_DISABLE - Setting this flag turns
+ * off delayed sack. If the spp_address field is blank then
+ * delayed sack is disabled for the entire association. Note
+ * also that this field is mutually exclusive to
+ * SPP_SACKDELAY_ENABLE, setting both will have undefined
+ * results.
*/
-static int sctp_setsockopt_peer_addr_params(struct sock *sk,
- char __user *optval, int optlen)
+int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
+ struct sctp_transport *trans,
+ struct sctp_association *asoc,
+ struct sctp_sock *sp,
+ int hb_change,
+ int pmtud_change,
+ int sackdelay_change)
{
- struct sctp_paddrparams params;
- struct sctp_transport *trans;
int error;
- if (optlen != sizeof(struct sctp_paddrparams))
- return -EINVAL;
- if (copy_from_user(¶ms, optval, optlen))
- return -EFAULT;
-
- /*
- * API 7. Socket Options (setting the default value for the endpoint)
- * All options that support specific settings on an association by
- * filling in either an association id variable or a sockaddr_storage
- * SHOULD also support setting of the same value for the entire endpoint
- * (i.e. future associations). To accomplish this the following logic is
- * used when setting one of these options:
-
- * c) If neither the sockaddr_storage or association identification is
- * set i.e. the sockaddr_storage is set to all 0's (INADDR_ANY) and
- * the association identification is 0, the settings are a default
- * and to be applied to the endpoint (all future associations).
- */
-
- /* update default value for endpoint (all future associations) */
- if (!params.spp_assoc_id &&
- sctp_is_any(( union sctp_addr *)¶ms.spp_address)) {
- /* Manual heartbeat on an endpoint is invalid. */
- if (0xffffffff == params.spp_hbinterval)
- return -EINVAL;
- else if (params.spp_hbinterval)
- sctp_sk(sk)->paddrparam.spp_hbinterval =
- params.spp_hbinterval;
- if (params.spp_pathmaxrxt)
- sctp_sk(sk)->paddrparam.spp_pathmaxrxt =
- params.spp_pathmaxrxt;
- return 0;
- }
-
- trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
- params.spp_assoc_id);
- if (!trans)
- return -EINVAL;
-
- /* Applications can enable or disable heartbeats for any peer address
- * of an association, modify an address's heartbeat interval, force a
- * heartbeat to be sent immediately, and adjust the address's maximum
- * number of retransmissions sent before an address is considered
- * unreachable.
- *
- * The value of the heartbeat interval, in milliseconds. A value of
- * UINT32_MAX (4294967295), when modifying the parameter, specifies
- * that a heartbeat should be sent immediately to the peer address,
- * and the current interval should remain unchanged.
- */
- if (0xffffffff == params.spp_hbinterval) {
+ if (params->spp_flags & SPP_HB_DEMAND && trans) {
error = sctp_primitive_REQUESTHEARTBEAT (trans->asoc, trans);
if (error)
return error;
- } else {
- /* The value of the heartbeat interval, in milliseconds. A value of 0,
- * when modifying the parameter, specifies that the heartbeat on this
- * address should be disabled.
- */
- if (params.spp_hbinterval) {
- trans->hb_allowed = 1;
- trans->hb_interval =
- msecs_to_jiffies(params.spp_hbinterval);
- } else
- trans->hb_allowed = 0;
}
- /* spp_pathmaxrxt contains the maximum number of retransmissions
- * before this address shall be considered unreachable.
+ if (params->spp_hbinterval) {
+ if (trans) {
+ trans->hbinterval = msecs_to_jiffies(params->spp_hbinterval);
+ } else if (asoc) {
+ asoc->hbinterval = msecs_to_jiffies(params->spp_hbinterval);
+ } else {
+ sp->hbinterval = params->spp_hbinterval;
+ }
+ }
+
+ if (hb_change) {
+ if (trans) {
+ trans->param_flags =
+ (trans->param_flags & ~SPP_HB) | hb_change;
+ } else if (asoc) {
+ asoc->param_flags =
+ (asoc->param_flags & ~SPP_HB) | hb_change;
+ } else {
+ sp->param_flags =
+ (sp->param_flags & ~SPP_HB) | hb_change;
+ }
+ }
+
+ if (params->spp_pathmtu) {
+ if (trans) {
+ trans->pathmtu = params->spp_pathmtu;
+ sctp_assoc_sync_pmtu(asoc);
+ } else if (asoc) {
+ asoc->pathmtu = params->spp_pathmtu;
+ sctp_frag_point(sp, params->spp_pathmtu);
+ } else {
+ sp->pathmtu = params->spp_pathmtu;
+ }
+ }
+
+ if (pmtud_change) {
+ if (trans) {
+ int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
+ (params->spp_flags & SPP_PMTUD_ENABLE);
+ trans->param_flags =
+ (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
+ if (update) {
+ sctp_transport_pmtu(trans);
+ sctp_assoc_sync_pmtu(asoc);
+ }
+ } else if (asoc) {
+ asoc->param_flags =
+ (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
+ } else {
+ sp->param_flags =
+ (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
+ }
+ }
+
+ if (params->spp_sackdelay) {
+ if (trans) {
+ trans->sackdelay =
+ msecs_to_jiffies(params->spp_sackdelay);
+ } else if (asoc) {
+ asoc->sackdelay =
+ msecs_to_jiffies(params->spp_sackdelay);
+ } else {
+ sp->sackdelay = params->spp_sackdelay;
+ }
+ }
+
+ if (sackdelay_change) {
+ if (trans) {
+ trans->param_flags =
+ (trans->param_flags & ~SPP_SACKDELAY) |
+ sackdelay_change;
+ } else if (asoc) {
+ asoc->param_flags =
+ (asoc->param_flags & ~SPP_SACKDELAY) |
+ sackdelay_change;
+ } else {
+ sp->param_flags =
+ (sp->param_flags & ~SPP_SACKDELAY) |
+ sackdelay_change;
+ }
+ }
+
+ if (params->spp_pathmaxrxt) {
+ if (trans) {
+ trans->pathmaxrxt = params->spp_pathmaxrxt;
+ } else if (asoc) {
+ asoc->pathmaxrxt = params->spp_pathmaxrxt;
+ } else {
+ sp->pathmaxrxt = params->spp_pathmaxrxt;
+ }
+ }
+
+ return 0;
+}
+
+static int sctp_setsockopt_peer_addr_params(struct sock *sk,
+ char __user *optval, int optlen)
+{
+ struct sctp_paddrparams params;
+ struct sctp_transport *trans = NULL;
+ struct sctp_association *asoc = NULL;
+ struct sctp_sock *sp = sctp_sk(sk);
+ int error;
+ int hb_change, pmtud_change, sackdelay_change;
+
+ if (optlen != sizeof(struct sctp_paddrparams))
+ return - EINVAL;
+
+ if (copy_from_user(¶ms, optval, optlen))
+ return -EFAULT;
+
+ /* Validate flags and value parameters. */
+ hb_change = params.spp_flags & SPP_HB;
+ pmtud_change = params.spp_flags & SPP_PMTUD;
+ sackdelay_change = params.spp_flags & SPP_SACKDELAY;
+
+ if (hb_change == SPP_HB ||
+ pmtud_change == SPP_PMTUD ||
+ sackdelay_change == SPP_SACKDELAY ||
+ params.spp_sackdelay > 500 ||
+ (params.spp_pathmtu
+ && params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
+ return -EINVAL;
+
+ /* If an address other than INADDR_ANY is specified, and
+ * no transport is found, then the request is invalid.
*/
- if (params.spp_pathmaxrxt)
- trans->max_retrans = params.spp_pathmaxrxt;
+ if (!sctp_is_any(( union sctp_addr *)¶ms.spp_address)) {
+ trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
+ params.spp_assoc_id);
+ if (!trans)
+ return -EINVAL;
+ }
+
+ /* Get association, if assoc_id != 0 and the socket is a one
+ * to many style socket, and an association was not found, then
+ * the id was invalid.
+ */
+ asoc = sctp_id2assoc(sk, params.spp_assoc_id);
+ if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
+ return -EINVAL;
+
+ /* Heartbeat demand can only be sent on a transport or
+ * association, but not a socket.
+ */
+ if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
+ return -EINVAL;
+
+ /* Process parameters. */
+ error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
+ hb_change, pmtud_change,
+ sackdelay_change);
+
+ if (error)
+ return error;
+
+ /* If changes are for association, also apply parameters to each
+ * transport.
+ */
+ if (!trans && asoc) {
+ struct list_head *pos;
+
+ list_for_each(pos, &asoc->peer.transport_addr_list) {
+ trans = list_entry(pos, struct sctp_transport,
+ transports);
+ sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
+ hb_change, pmtud_change,
+ sackdelay_change);
+ }
+ }
return 0;
}
@@ -2334,7 +2503,7 @@
/* Update the frag_point of the existing associations. */
list_for_each(pos, &(sp->ep->asocs)) {
asoc = list_entry(pos, struct sctp_association, asocs);
- asoc->frag_point = sctp_frag_point(sp, asoc->pmtu);
+ asoc->frag_point = sctp_frag_point(sp, asoc->pathmtu);
}
return 0;
@@ -2715,8 +2884,13 @@
/* Default Peer Address Parameters. These defaults can
* be modified via SCTP_PEER_ADDR_PARAMS
*/
- sp->paddrparam.spp_hbinterval = jiffies_to_msecs(sctp_hb_interval);
- sp->paddrparam.spp_pathmaxrxt = sctp_max_retrans_path;
+ sp->hbinterval = jiffies_to_msecs(sctp_hb_interval);
+ sp->pathmaxrxt = sctp_max_retrans_path;
+ sp->pathmtu = 0; // allow default discovery
+ sp->sackdelay = sctp_sack_timeout;
+ sp->param_flags = SPP_HB_ENABLE |
+ SPP_PMTUD_ENABLE |
+ SPP_SACKDELAY_ENABLE;
/* If enabled no SCTP message fragmentation will be performed.
* Configure through SCTP_DISABLE_FRAGMENTS socket option.
@@ -2865,7 +3039,7 @@
status.sstat_primary.spinfo_cwnd = transport->cwnd;
status.sstat_primary.spinfo_srtt = transport->srtt;
status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
- status.sstat_primary.spinfo_mtu = transport->pmtu;
+ status.sstat_primary.spinfo_mtu = transport->pathmtu;
if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
status.sstat_primary.spinfo_state = SCTP_ACTIVE;
@@ -2924,7 +3098,7 @@
pinfo.spinfo_cwnd = transport->cwnd;
pinfo.spinfo_srtt = transport->srtt;
pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
- pinfo.spinfo_mtu = transport->pmtu;
+ pinfo.spinfo_mtu = transport->pathmtu;
if (pinfo.spinfo_state == SCTP_UNKNOWN)
pinfo.spinfo_state = SCTP_ACTIVE;
@@ -3086,69 +3260,154 @@
* address's parameters:
*
* struct sctp_paddrparams {
- * sctp_assoc_t spp_assoc_id;
- * struct sockaddr_storage spp_address;
- * uint32_t spp_hbinterval;
- * uint16_t spp_pathmaxrxt;
- * };
+ * sctp_assoc_t spp_assoc_id;
+ * struct sockaddr_storage spp_address;
+ * uint32_t spp_hbinterval;
+ * uint16_t spp_pathmaxrxt;
+ * uint32_t spp_pathmtu;
+ * uint32_t spp_sackdelay;
+ * uint32_t spp_flags;
+ * };
*
- * spp_assoc_id - (UDP style socket) This is filled in the application,
- * and identifies the association for this query.
+ * spp_assoc_id - (one-to-many style socket) This is filled in the
+ * application, and identifies the association for
+ * this query.
* spp_address - This specifies which address is of interest.
* spp_hbinterval - This contains the value of the heartbeat interval,
- * in milliseconds. A value of 0, when modifying the
- * parameter, specifies that the heartbeat on this
- * address should be disabled. A value of UINT32_MAX
- * (4294967295), when modifying the parameter,
- * specifies that a heartbeat should be sent
- * immediately to the peer address, and the current
- * interval should remain unchanged.
+ * in milliseconds. If a value of zero
+ * is present in this field then no changes are to
+ * be made to this parameter.
* spp_pathmaxrxt - This contains the maximum number of
* retransmissions before this address shall be
- * considered unreachable.
+ * considered unreachable. If a value of zero
+ * is present in this field then no changes are to
+ * be made to this parameter.
+ * spp_pathmtu - When Path MTU discovery is disabled the value
+ * specified here will be the "fixed" path mtu.
+ * Note that if the spp_address field is empty
+ * then all associations on this address will
+ * have this fixed path mtu set upon them.
+ *
+ * spp_sackdelay - When delayed sack is enabled, this value specifies
+ * the number of milliseconds that sacks will be delayed
+ * for. This value will apply to all addresses of an
+ * association if the spp_address field is empty. Note
+ * also, that if delayed sack is enabled and this
+ * value is set to 0, no change is made to the last
+ * recorded delayed sack timer value.
+ *
+ * spp_flags - These flags are used to control various features
+ * on an association. The flag field may contain
+ * zero or more of the following options.
+ *
+ * SPP_HB_ENABLE - Enable heartbeats on the
+ * specified address. Note that if the address
+ * field is empty all addresses for the association
+ * have heartbeats enabled upon them.
+ *
+ * SPP_HB_DISABLE - Disable heartbeats on the
+ * speicifed address. Note that if the address
+ * field is empty all addresses for the association
+ * will have their heartbeats disabled. Note also
+ * that SPP_HB_ENABLE and SPP_HB_DISABLE are
+ * mutually exclusive, only one of these two should
+ * be specified. Enabling both fields will have
+ * undetermined results.
+ *
+ * SPP_HB_DEMAND - Request a user initiated heartbeat
+ * to be made immediately.
+ *
+ * SPP_PMTUD_ENABLE - This field will enable PMTU
+ * discovery upon the specified address. Note that
+ * if the address feild is empty then all addresses
+ * on the association are effected.
+ *
+ * SPP_PMTUD_DISABLE - This field will disable PMTU
+ * discovery upon the specified address. Note that
+ * if the address feild is empty then all addresses
+ * on the association are effected. Not also that
+ * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
+ * exclusive. Enabling both will have undetermined
+ * results.
+ *
+ * SPP_SACKDELAY_ENABLE - Setting this flag turns
+ * on delayed sack. The time specified in spp_sackdelay
+ * is used to specify the sack delay for this address. Note
+ * that if spp_address is empty then all addresses will
+ * enable delayed sack and take on the sack delay
+ * value specified in spp_sackdelay.
+ * SPP_SACKDELAY_DISABLE - Setting this flag turns
+ * off delayed sack. If the spp_address field is blank then
+ * delayed sack is disabled for the entire association. Note
+ * also that this field is mutually exclusive to
+ * SPP_SACKDELAY_ENABLE, setting both will have undefined
+ * results.
*/
static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
- char __user *optval, int __user *optlen)
+ char __user *optval, int __user *optlen)
{
- struct sctp_paddrparams params;
- struct sctp_transport *trans;
+ struct sctp_paddrparams params;
+ struct sctp_transport *trans = NULL;
+ struct sctp_association *asoc = NULL;
+ struct sctp_sock *sp = sctp_sk(sk);
if (len != sizeof(struct sctp_paddrparams))
return -EINVAL;
+
if (copy_from_user(¶ms, optval, len))
return -EFAULT;
- /* If no association id is specified retrieve the default value
- * for the endpoint that will be used for all future associations
+ /* If an address other than INADDR_ANY is specified, and
+ * no transport is found, then the request is invalid.
*/
- if (!params.spp_assoc_id &&
- sctp_is_any(( union sctp_addr *)¶ms.spp_address)) {
- params.spp_hbinterval = sctp_sk(sk)->paddrparam.spp_hbinterval;
- params.spp_pathmaxrxt = sctp_sk(sk)->paddrparam.spp_pathmaxrxt;
-
- goto done;
+ if (!sctp_is_any(( union sctp_addr *)¶ms.spp_address)) {
+ trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
+ params.spp_assoc_id);
+ if (!trans) {
+ SCTP_DEBUG_PRINTK("Failed no transport\n");
+ return -EINVAL;
+ }
}
- trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
- params.spp_assoc_id);
- if (!trans)
+ /* Get association, if assoc_id != 0 and the socket is a one
+ * to many style socket, and an association was not found, then
+ * the id was invalid.
+ */
+ asoc = sctp_id2assoc(sk, params.spp_assoc_id);
+ if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
+ SCTP_DEBUG_PRINTK("Failed no association\n");
return -EINVAL;
+ }
- /* The value of the heartbeat interval, in milliseconds. A value of 0,
- * when modifying the parameter, specifies that the heartbeat on this
- * address should be disabled.
- */
- if (!trans->hb_allowed)
- params.spp_hbinterval = 0;
- else
- params.spp_hbinterval = jiffies_to_msecs(trans->hb_interval);
+ if (trans) {
+ /* Fetch transport values. */
+ params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
+ params.spp_pathmtu = trans->pathmtu;
+ params.spp_pathmaxrxt = trans->pathmaxrxt;
+ params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
- /* spp_pathmaxrxt contains the maximum number of retransmissions
- * before this address shall be considered unreachable.
- */
- params.spp_pathmaxrxt = trans->max_retrans;
+ /*draft-11 doesn't say what to return in spp_flags*/
+ params.spp_flags = trans->param_flags;
+ } else if (asoc) {
+ /* Fetch association values. */
+ params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
+ params.spp_pathmtu = asoc->pathmtu;
+ params.spp_pathmaxrxt = asoc->pathmaxrxt;
+ params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
-done:
+ /*draft-11 doesn't say what to return in spp_flags*/
+ params.spp_flags = asoc->param_flags;
+ } else {
+ /* Fetch socket values. */
+ params.spp_hbinterval = sp->hbinterval;
+ params.spp_pathmtu = sp->pathmtu;
+ params.spp_sackdelay = sp->sackdelay;
+ params.spp_pathmaxrxt = sp->pathmaxrxt;
+
+ /*draft-11 doesn't say what to return in spp_flags*/
+ params.spp_flags = sp->param_flags;
+ }
+
if (copy_to_user(optval, ¶ms, len))
return -EFAULT;
diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index 268ddaf..68d73e2 100644
--- a/net/sctp/transport.c
+++ b/net/sctp/transport.c
@@ -86,10 +86,13 @@
peer->init_sent_count = 0;
peer->state = SCTP_ACTIVE;
- peer->hb_allowed = 0;
+ peer->param_flags = SPP_HB_DISABLE |
+ SPP_PMTUD_ENABLE |
+ SPP_SACKDELAY_ENABLE;
+ peer->hbinterval = 0;
/* Initialize the default path max_retrans. */
- peer->max_retrans = sctp_max_retrans_path;
+ peer->pathmaxrxt = sctp_max_retrans_path;
peer->error_count = 0;
INIT_LIST_HEAD(&peer->transmitted);
@@ -229,10 +232,10 @@
dst = transport->af_specific->get_dst(NULL, &transport->ipaddr, NULL);
if (dst) {
- transport->pmtu = dst_mtu(dst);
+ transport->pathmtu = dst_mtu(dst);
dst_release(dst);
} else
- transport->pmtu = SCTP_DEFAULT_MAXSEGMENT;
+ transport->pathmtu = SCTP_DEFAULT_MAXSEGMENT;
}
/* Caches the dst entry and source address for a transport's destination
@@ -254,8 +257,11 @@
af->get_saddr(asoc, dst, daddr, &transport->saddr);
transport->dst = dst;
+ if ((transport->param_flags & SPP_PMTUD_DISABLE) && transport->pathmtu) {
+ return;
+ }
if (dst) {
- transport->pmtu = dst_mtu(dst);
+ transport->pathmtu = dst_mtu(dst);
/* Initialize sk->sk_rcv_saddr, if the transport is the
* association's active path for getsockname().
@@ -264,7 +270,7 @@
opt->pf->af->to_sk_saddr(&transport->saddr,
asoc->base.sk);
} else
- transport->pmtu = SCTP_DEFAULT_MAXSEGMENT;
+ transport->pathmtu = SCTP_DEFAULT_MAXSEGMENT;
}
/* Hold a reference to a transport. */
@@ -369,7 +375,7 @@
ssthresh = transport->ssthresh;
pba = transport->partial_bytes_acked;
- pmtu = transport->asoc->pmtu;
+ pmtu = transport->asoc->pathmtu;
if (cwnd <= ssthresh) {
/* RFC 2960 7.2.1, sctpimpguide-05 2.14.2 When cwnd is less
@@ -441,8 +447,8 @@
* partial_bytes_acked = 0
*/
transport->ssthresh = max(transport->cwnd/2,
- 4*transport->asoc->pmtu);
- transport->cwnd = transport->asoc->pmtu;
+ 4*transport->asoc->pathmtu);
+ transport->cwnd = transport->asoc->pathmtu;
break;
case SCTP_LOWER_CWND_FAST_RTX:
@@ -459,7 +465,7 @@
* partial_bytes_acked = 0
*/
transport->ssthresh = max(transport->cwnd/2,
- 4*transport->asoc->pmtu);
+ 4*transport->asoc->pathmtu);
transport->cwnd = transport->ssthresh;
break;
@@ -479,7 +485,7 @@
if ((jiffies - transport->last_time_ecne_reduced) >
transport->rtt) {
transport->ssthresh = max(transport->cwnd/2,
- 4*transport->asoc->pmtu);
+ 4*transport->asoc->pathmtu);
transport->cwnd = transport->ssthresh;
transport->last_time_ecne_reduced = jiffies;
}
@@ -496,7 +502,7 @@
*/
if ((jiffies - transport->last_time_used) > transport->rto)
transport->cwnd = max(transport->cwnd/2,
- 4*transport->asoc->pmtu);
+ 4*transport->asoc->pathmtu);
break;
};
@@ -511,7 +517,7 @@
unsigned long sctp_transport_timeout(struct sctp_transport *t)
{
unsigned long timeout;
- timeout = t->hb_interval + t->rto + sctp_jitter(t->rto);
+ timeout = t->hbinterval + t->rto + sctp_jitter(t->rto);
timeout += jiffies;
return timeout;
}
