[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, 19 insertions, 13 deletions

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 @@ static struct sctp_transport *sctp_transport_init(struct sctp_transport *peer,
 	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 @@ void sctp_transport_pmtu(struct sctp_transport *transport)
 	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 @@ void sctp_transport_route(struct sctp_transport *transport,
 		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 @@ void sctp_transport_route(struct sctp_transport *transport,
 			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 @@ void sctp_transport_raise_cwnd(struct sctp_transport *transport,
 
 	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 @@ void sctp_transport_lower_cwnd(struct sctp_transport *transport,
 		 *      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 @@ void sctp_transport_lower_cwnd(struct sctp_transport *transport,
 		 *      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 @@ void sctp_transport_lower_cwnd(struct sctp_transport *transport,
 		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 @@ void sctp_transport_lower_cwnd(struct sctp_transport *transport,
 		 */
 		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 @@ void sctp_transport_lower_cwnd(struct sctp_transport *transport,
 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;
 }