[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>

1 files changed, 55 insertions, 26 deletions

diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index dec68a604773..9d05e13e92f6 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -110,7 +110,6 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
         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 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
 
         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 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
                 = 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 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
 
         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 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
          *   (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 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
         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 @@ void sctp_assoc_sync_pmtu(struct sctp_association *asoc)
         /* 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 @@ static inline int sctp_peer_needs_update(struct sctp_association *asoc)
         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: